How to set Delay for loop in android?

How to set Delay for loop in android? - android

I am trying to display a multiplication table with delay. My code is working fine but I am not able to implement the delay.
Here is My code:
tableButton1 = (Button) findViewById(R.id.Button1);
tableButton1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new Thread(new Runnable() {
public void run() {
str = tableButton1.getText().toString();
a = Integer.parseInt(str);
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= 10; i++){
sb.append(a + " x " + i + " = " + i * a+ "\n");
}
s = String.valueOf(sb);
Intent intent=new Intent(getApplicationContext(),TextViewActivity.class);
intent.putExtra("MA", s);
startActivity(intent);
}
});
//Toast.makeText(getApplicationContext(), "Hi" +ss, 222).show();
}
});
Any answer is appreciable.
Thank's in advance
Updated-code:- This code is working with help of #theLittleNaruto
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class TestActivity extends Activity{
Button tableButton1;
TextView txtView;
int value = 0;
static int count = 0;
Handler handle = new Handler();
StringBuilder sb = new StringBuilder();
Runnable r = new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(), "onrunnable" +sb, 222).show();
// TODO Auto-generated method stub
updateTable();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.text_display);
Toast.makeText(getApplicationContext(), "oncreate" , 222).show();
txtView = (TextView) findViewById(R.id.outputTXT);
tableButton1 = (Button) findViewById(R.id.seven);
tableButton1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "onclick" , 222).show();
value= Integer.parseInt(tableButton1.getText().toString());
updateTable();
}
});
}
public void updateTable(){
count+=1000;
if(count==11000){
//Toast.makeText(getApplicationContext(), "onupdate" , 222).show();
count = 0;
value=0;
handle.removeCallbacks(r);
sb.setLength(0);
}else{
sb.append(value + " x " + count/1000 + " = " + count/1000 * value+ "\n");
handle.postDelayed(r, 1000);
// Toast.makeText(getApplicationContext(), "onupdateElse" +sb, 222).show();
txtView.setText(sb);
}
}
}
Thank you all the supporters and their best try to help me

Why dont you try what the other is saying with this little effort ;)
public class TestActivity extends Activity{
int value = 0;
static int count = 0;
Handler handle = new Handler();
StringBuilder sb = new StringBuilder();
Runnable r = new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
updateTable();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.oaot_get);
tableButton1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
value= Integer.parseInt(tableButton1.getText().toString());
updateTable();
}
});
}
public void updateTable(){
count+=1000;
if(count==11000){
count = 0;
value=0;
handle.removeCallbacks(r);
sb.setLength(0);
}else{
sb.append(value + " x " + count/1000 + " = " + count/1000 * value+ "\n");
handle.postDelayed(r, 1000);
}
}
}

Try this
Timer timer = new Timer();
timer.schedule(new TimerTask() {
public void run() {
str = tableButton1.getText().toString();
a = Integer.parseInt(str);
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= 10; i++){
sb.append(a + " x " + i + " = " + i * a+ "\n");
}
}, 5000);
s = String.valueOf(sb);
Intent intent=new Intent(getApplicationContext(),TextViewActivity.class);
intent.putExtra("MA", s);
startActivity(intent);

Add a handler(). Replace your onClick code with:
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
str = tableButton1.getText().toString();
a = Integer.parseInt(str);
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= 10; i++)
{
sb.append(a + " x " + i + " = " + i * a+ "\n");
}s=String.valueOf(sb);
Intent intent=new Intent(getApplicationContext(),TextViewActivity.class);
intent.putExtra("MA", s);
startActivity(intent);
}
}, 5000);
Repalce 5000 with the time you want it to be delayed for in milliseconds

Add a Handler that will execute your runnable:
Runnable runnable = new Runnable() {
#Override
public void run() {
str = tableButton1.getText().toString();
a = Integer.parseInt(str);
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= 10; i++){
sb.append(a + " x " + i + " = " + i * a+ "\n");
//--ADDED stuff here------------------------------------------------------------
try {
//Sleep will suspend your Thread for 500 miliseconds and resumes afterwards
Thread.sleep(500);
} catch (InterruptedException e) {
Log.e("error, Thread interrupted", e);
}
}
s = String.valueOf(sb);
Intent intent=new Intent(getApplicationContext(),TextViewActivity.class);
intent.putExtra("MA", s);
startActivity(intent);
}
Handler handler = new Handler();
//this will execute your runnable after 500 milliseconds
handler.postDelayed(runnable, 500);

You can use that :
public class Scheduler {
// DATA
private OnScheduleTimeListener mListener;
private Handler mHandler;
private int mInterval; // Between each executions
private static final int DELAY = 100; // before first execution
private boolean mIsTimerRunning;
public static interface OnScheduleTimeListener {
public void onScheduleTime();
}
public Scheduler(int interval) {
super();
mInterval = interval;
mHandler = new Handler();
}
private final Runnable mRunnable = new Runnable() {
#Override
public void run() {
// Do stuff
mListener.onScheduleTime();
// Repeat
mHandler.postDelayed(mRunnable, mInterval);
}
};
public void setOnScheduleTimeListener(OnScheduleTimeListener listener) {
mListener = listener;
}
public void startTimer() {
mIsTimerRunning = true;
mHandler.postDelayed(mRunnable, DELAY);
}
public void stopTimer() {
mIsTimerRunning = false;
mHandler.removeCallbacks(mRunnable);
}
public boolean isTimerRunning() {
return mIsTimerRunning;
}
}
Now to use it :
private void startTimer() {
mScheduler = new Scheduler(INTERVAL);
mScheduler.setOnScheduleTimeListener(new OnScheduleTimeListener() {
#Override
public void onScheduleTime() {
Log.d(TAG, "update");
});
mScheduler.startTimer();
}
private void stopTimer(){
if (mScheduler != null && mScheduler.isTimerRunning()) {
mScheduler.stopTimer();
mScheduler = null;
}
}

Try this....
do {
try {
try {
response_req_sequence = SimpleHttpClient
.sendresponseSequReqRes(response_send_order);
System.out.println("response of sequence request"
+ response_req_sequence);
System.out.println(" i ma in thread");
if (response_req_sequence.trim().length() != 0) {
System.out.println("response in result of sequ"+ response_req_sequence);
break;
}
Thread.sleep(10000);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (Exception e) {
// TODO: handle exception
}
} while (response_req_sequence.trim().equalsIgnoreCase(""));
This is working fine for me. you can customize according to you.

Related

Android thread error

The thread in my application is giving a weird error on the myThread.start() function specifically the start is wrong the error is "Cannot resolve symbol start" . initially i thought it was a bracket issue but when i adjust them it ends up breaking the OnClicklistner. The thread is suppose just suppose to make the user wait before doing a set text and then the following button will take the user to a website. Can any one see my error?
package com.example.trap.york_hw6;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;
public class Main3Activity extends AppCompatActivity implements View.OnClickListener {
Button Cheat;
Button NextPage3;
WebView browser3;
#SuppressLint("HandlerLeak")
Handler handler = new Handler() {
public void handleMessage(Message msg) {
TextView statement = (TextView) findViewById(R.id.snitch);
statement.setText("Checking to see if your a cop");
}
;
};
#SuppressLint("HandlerLeak")
Handler handler2 = new Handler() {
public void handleMessage(Message msg) {
browser3.loadUrl("https://www.youtube.com");
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
browser3 = (WebView) findViewById(R.id.webkit3);
browser3.getSettings().setJavaScriptEnabled(true);
browser3.getSettings().setDomStorageEnabled(true);
Cheat = (Button) findViewById(R.id.CC);
NextPage3 = (Button) findViewById(R.id.Next3);
NextPage3.setOnClickListener(this);
Cheat.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Runnable r = new Runnable() {
public void run() {
long futureTime = System.currentTimeMillis() + 5000;
while (System.currentTimeMillis() < futureTime) {
synchronized (this) {
try {
wait(futureTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
handler.sendEmptyMessage(0);
}
;
Thread myThread = new Thread(r);
myThread.start();
};
}
});
final Runnable r2 = new Runnable() {
public void run() {
long futureTime = System.currentTimeMillis() + 7000;
while (System.currentTimeMillis() < futureTime) {
synchronized (this) {
try {
wait(futureTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
handler.sendEmptyMessage(0);
}
;
Thread myThread2 = new Thread(r2);
myThread2.start();
};
}
public void onClick(View v) {
Intent i = new Intent(this, Main4Activity.class);
i.putExtra("value", "I got this from MainActivity2");
i.putExtra("value1", 5);
startActivityForResult(i, 3);
}
}

You are starting thread inside wrong block. Try the code below .
final Runnable r2 = new Runnable() {
public void run() {
long futureTime = System.currentTimeMillis() + 7000;
while (System.currentTimeMillis() < futureTime) {
synchronized (this) {
try {
wait(futureTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
handler.sendEmptyMessage(0);
};
};
Thread myThread2 = new Thread(r2);
myThread2.start();
AND
Cheat.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Runnable r = new Runnable() {
public void run() {
long futureTime = System.currentTimeMillis() + 5000;
while (System.currentTimeMillis() < futureTime) {
synchronized (this) {
try {
wait(futureTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
handler.sendEmptyMessage(0);
};
};
Thread myThread = new Thread(r);
myThread.start();
}
});

You can not initialise and start Runnable inside its block.
You can write like this.
Cheat.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Runnable r = new Runnable() {
public void run() {
long futureTime = System.currentTimeMillis() + 5000;
while (System.currentTimeMillis() < futureTime) {
synchronized (this) {
try {
wait(futureTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
handler.sendEmptyMessage(0);
}
};
Thread myThread = new Thread(r);
myThread.start();
}
});
and second one
final Runnable r2 = new Runnable() {
public void run() {
long futureTime = System.currentTimeMillis() + 7000;
while (System.currentTimeMillis() < futureTime) {
synchronized (this) {
try {
wait(futureTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
handler.sendEmptyMessage(0);
}
};
Thread myThread2 = new Thread(r2);
myThread2.start();
Suggestion : Also i seen your onClick method, i suggest you check clicked button's id before doing any action like. Because if you have multiple buttons having OnClickListener referring to current class, you will need to check.
public void onClick(View v) {
switch (v.getId()){
case R.id.Next3:
Intent i = new Intent(this, Main4Activity.class);
i.putExtra("value", "I got this from MainActivity2");
i.putExtra("value1", 5);
startActivityForResult(i, 3);
break;
}
}

how to pause progressbar in android

I have made a progressbar in android,Which is horizontal,i want to freeze it when any button click in my activity,I have tried as below,But progress still displays.my code is as below:I want to do something like one question loaded after another,and onClick of any button counter and progress state should be stop,but rite now my timer stop but progress still ran up..it not stops.
code
public class QuestionAnswerActivity extends Activity implements OnClickListener {
// visible gone
ArrayList<HashMap<String, String>> QuestionList;
private int progressStatus = 0;
private Handler handler = new Handler();
Intent i;
private boolean run = true;
/**
* Answer [1=true / 0 =false]
*/
int myans;
String ans;
ProgressDialog pDialog;
TextView text_player_one;
String JsonStr;
ArrayList<HashMap<String, String>> questionList;
ImageView player_one_pic;
int count;
private DisplayImageOptions options;
public static ImageLoader imageLoader;
ImageView answer_right_one;
ProgressBar pg_loading;
private CountDownTimer countDownTimer;
TextView timer_text;
private final long startTime = 8 * 1000;
private final long interval = 1 * 1000;
Button opt_1, opt_2, opt_3, opt_4;
Thread splashThread;
TextView answer_question;
LinearLayout answer_linear_3;
// Response variables...!!
// Single player*************************************
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.question_answer_activity);
init();
}
// ***********************************************************************************************
/**
* Initialise the views
*/
#SuppressWarnings({ "deprecation", "unchecked" })
private void init() {
answer_linear_3 = (LinearLayout) findViewById(R.id.answer_linear_3);
answer_linear_3.setVisibility(View.GONE);
questionList = new ArrayList<HashMap<String, String>>();
answer_question = (TextView) findViewById(R.id.answer_question);
player_one_pic = (ImageView) findViewById(R.id.player_one_pic);
text_player_one = (TextView) findViewById(R.id.text_player_one);
text_player_one.setText(Pref.getValue(QuestionAnswerActivity.this,
Const.PREF_NAME, ""));
pg_loading = (ProgressBar) findViewById(R.id.pg_loading_answer);
timer_text = (TextView) findViewById(R.id.timer_text_loading11);
answer_right_one = (ImageView) findViewById(R.id.answer_right_one);
imageLoader = ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration
.createDefault(QuestionAnswerActivity.this));
options = new DisplayImageOptions.Builder().cacheOnDisc(true)
.displayer(new RoundedBitmapDisplayer((int) 3.5f))
.showStubImage(R.drawable.ic_launcher)
.showImageOnFail(R.drawable.ic_launcher).build();
imageLoader.displayImage(Pref.getValue(QuestionAnswerActivity.this,
Const.PREF_PROFILE_PIC, ""), player_one_pic, options);
opt_1 = (Button) findViewById(R.id.option_1);
opt_2 = (Button) findViewById(R.id.option_2);
opt_3 = (Button) findViewById(R.id.option_3);
opt_4 = (Button) findViewById(R.id.option_4);
count = 0;
questionList = (ArrayList<HashMap<String, String>>) getIntent()
.getSerializableExtra("queList");
System.out.println("::::::::My questions::::::::;+++++++"
+ questionList);
/*
* answer_question.setText(questionList.get(count).get("q_title"));
* opt_1.setText(questionList.get(count).get("opt1"));
* opt_2.setText(questionList.get(count).get("opt2"));
* opt_3.setText(questionList.get(count).get("opt3"));
* opt_4.setText(questionList.get(count).get("ans"));
*/
handler.postDelayed(new ViewUpdater(answer_linear_3), 1000);
answer_question.setText(questionList.get(count).get("q_title"));
opt_1.setText(questionList.get(count).get("opt1"));
opt_2.setText(questionList.get(count).get("opt2"));
opt_3.setText(questionList.get(count).get("opt3"));
opt_4.setText(questionList.get(count).get("ans"));
opt_1.setOnClickListener(this);
opt_2.setOnClickListener(this);
opt_3.setOnClickListener(this);
opt_4.setOnClickListener(this);
countDownTimer = new MyCountDownTimer(startTime, interval);
/*
* Initialise NoResponse Timer
*/
timer_text.setText(timer_text.getText()
+ String.valueOf(startTime / 1000));
countDownTimer.start();
new Thread(new Runnable() {
public void run() {
while (progressStatus < 100) {
progressStatus += 1;
// Update the progress bar and display the
// current value in the text view
handler.post(new Runnable() {
public void run() {
if (run) {
pg_loading.setProgress(progressStatus);
pg_loading.setProgressDrawable(getResources()
.getDrawable(R.drawable.progress));
}
}
});
try {
// Sleep for 200 milliseconds.
// Just to display the progress slowly
Thread.sleep(62);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
// ***********************************************************************************************
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
run = false;
switch (v.getId()) {
case R.id.option_1:
if (count <= 7) {
count++;
progressStatus = pg_loading.getProgress();
/* questionTask(count); */
new LeaveResponse()
.execute(questionList.get(count).get("q_id"));
}
break;
case R.id.option_2:
if (count <= 7) {
count++;
progressStatus = pg_loading.getProgress();
new LeaveResponse()
.execute(questionList.get(count).get("q_id"));
}
break;
case R.id.option_3:
if (count <= 7) {
count++;
progressStatus = pg_loading.getProgress();
new LeaveResponse()
.execute(questionList.get(count).get("q_id"));
}
break;
case R.id.option_4:
if (count <= 7) {
count++;
progressStatus = pg_loading.getProgress();
new LeaveResponse()
.execute(questionList.get(count).get("q_id"));
}
/*
* answer_question.setText(QuestionList.get(count).get("q_title"));
* opt_1.setText(QuestionList.get(count).get("opt1"));
* opt_2.setText(QuestionList.get(count).get("opt2"));
* opt_3.setText(QuestionList.get(count).get("opt3"));
* opt_4.setText(QuestionList.get(count).get("ans"));
* timer_text.setText(timer_text.getText() +
* String.valueOf(startTime / 1000));
*
* countDownTimer.start();
* answer_right_one.setVisibility(View.VISIBLE);
* pg_loading.setVisibility(View.GONE); countDownTimer.cancel();
*
* Toast.makeText(QuestionAnswerActivity.this,
* timer_text.getText().toString(), 1).show();
*/
break;
}
}
// ***********************************************************************************************
/**
* CountDown Timer for Starting No response activity if user doesnt
* responds.
*/
public class MyCountDownTimer extends CountDownTimer {
public MyCountDownTimer(long startTime, long interval) {
super(startTime, interval);
}
public void onpause() {
// TODO Auto-generated method stub
Toast.makeText(QuestionAnswerActivity.this, "Clicked", 1).show();
}
#Override
public void onFinish() {
Toast.makeText(getApplicationContext(), "onFinish",
Toast.LENGTH_SHORT).show();
/*
* If finish , that is user not responding , go to NoResponse
* screen.
*/
Intent intent = null;
intent = new Intent(QuestionAnswerActivity.this,
NoResponseActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(intent);
finish();
}
#Override
public void onTick(long millisUntilFinished) {
timer_text.setText("" + millisUntilFinished / 1000);
}
}
#SuppressWarnings("deprecation")
#SuppressLint("NewApi")
void questionTask(int count) throws InterruptedException {
if (count < 8) {
answer_linear_3.setVisibility(View.GONE);
answer_question.setText(questionList.get(count).get("q_title"));
handler.postDelayed(new ViewUpdater(answer_linear_3), 100);
myans = randomGenerator();
System.out.println(":::::::::::::;randomized answer::::::::::::;;;"
+ myans);
if (myans == 1) {
opt_1.setBackgroundDrawable(getResources().getDrawable(
R.drawable.true_selector));
opt_1.setText(questionList.get(count).get("ans"));
opt_2.setText(questionList.get(count).get("opt2"));
opt_3.setText(questionList.get(count).get("opt3"));
opt_4.setText(questionList.get(count).get("opt1"));
} else if (myans == 2) {
opt_2.setBackgroundDrawable(getResources().getDrawable(
R.drawable.true_selector));
opt_1.setText(questionList.get(count).get("opt2"));
opt_2.setText(questionList.get(count).get("ans"));
opt_3.setText(questionList.get(count).get("opt3"));
opt_4.setText(questionList.get(count).get("ans"));
} else if (myans == 3) {
opt_3.setBackgroundDrawable(getResources().getDrawable(
R.drawable.true_selector));
opt_1.setText(questionList.get(count).get("opt1"));
opt_2.setText(questionList.get(count).get("opt2"));
opt_3.setText(questionList.get(count).get("ans"));
opt_4.setText(questionList.get(count).get("opt3"));
} else {
opt_4.setBackgroundDrawable(getResources().getDrawable(
R.drawable.true_selector));
opt_1.setText(questionList.get(count).get("opt1"));
opt_2.setText(questionList.get(count).get("opt2"));
opt_3.setText(questionList.get(count).get("opt3"));
opt_4.setText(questionList.get(count).get("ans"));
}
countDownTimer = new MyCountDownTimer(startTime, interval);
/*
* Initialise NoResponse Timer
*/
timer_text.setText(timer_text.getText()
+ String.valueOf(startTime / 1000));
countDownTimer.start();
}
}
private class ViewUpdater implements Runnable {
private LinearLayout mView;
public ViewUpdater(LinearLayout linView) {
mView = linView;
}
#Override
public void run() {
mView.setVisibility(View.VISIBLE);
}
}
// Answer webservice call..!
private class LeaveResponse extends AsyncTask<String, String, Void> {
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
countDownTimer.cancel();
pDialog = new ProgressDialog(QuestionAnswerActivity.this);
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
BackendAPIService sh = new BackendAPIService();
String ResponseURL = Const.API_RESPONSE
+ "?os=droid&user_id="
+ Pref.getValue(QuestionAnswerActivity.this,
Const.PREF_USER_ID, "") + "&myrole="
+ Const.MY_ROLL + "&q_id=" + params[0] + "&ans=" + ans
+ "&time=5&game_id=" + Const.GAME_ID + "";
JsonStr = sh.makeServiceCall(ResponseURL, BackendAPIService.GET);
System.out.println("::::::::::::;My Response request::::::::::;;;"
+ ResponseURL);
Log.d("Response: ", "> " + JsonStr);
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
try {
countDownTimer.cancel();
pg_loading.setProgress(0);
progressStatus = 0;
new Thread(new Runnable() {
public void run() {
while (progressStatus < 100) {
progressStatus += 1;
// Update the progress bar and display the
// current value in the text view
handler.post(new Runnable() {
public void run() {
if (run) {
pg_loading.setProgress(progressStatus);
pg_loading
.setProgressDrawable(getResources()
.getDrawable(
R.drawable.progress));
}
}
});
try {
// Sleep for 200 milliseconds.
// Just to display the progress slowly
Thread.sleep(62);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
questionTask(count);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public int randomGenerator() {
Random r = new Random();
int ans = r.nextInt(4 - 1) + 1;
return ans;
}
}

You can easily hold some boolean variable for that case:
private boolean run = true;
then gather all the Buttons onClickListeners in one click listener, like the main one of the class, and upon anyclick make that variable run=false, So, check that before set the progress:
if(run){
pg_loading.setProgress(progressStatus);
}else{
//stop, finish, do whatever you want
}
in onClick listener:
public void onClick(View v) {
// TODO Auto-generated method stub
run = false;
Intent i;
switch (v.getId()) {
.
.
.
}
UPDATE:
make the thread as the following:
new Thread(new Runnable() {
public void run() {
while (progressStatus < 100) {
progressStatus += 1;
// Update the progress bar and display the
// current value in the text view
handler.post(new Runnable() {
public void run() {
if(run){
pg_loading.setProgress(progressStatus);
pg_loading.setProgressDrawable(getResources()
.getDrawable(R.drawable.progress));
}
}
});
try {
// Sleep for 200 milliseconds.
// Just to display the progress slowly
Thread.sleep(62);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
UPDATE 2:
your onPostExcute in the AsyncTask must be:
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
try {
countDownTimer.cancel();
pg_loading.setProgress(0);
progressStatus = 0;
new Thread(new Runnable() {
public void run() {
while (progressStatus < 100) {
progressStatus += 1;
// Update the progress bar and display the
// current value in the text view
handler.post(new Runnable() {
public void run() {
pg_loading.setProgress(progressStatus);
pg_loading
.setProgressDrawable(getResources()
.getDrawable(
R.drawable.progress));
}
});

Why does the progressbar accelerate whenever activity restarts

I have a question about the progress bar. There is activity with question and answers. When user click on one of those answers. activity calls itself and generate new question with answers. In the header, I have progress bar, and the progress bar is full for N seconds. Every time the activity calls itself, the progress bar is full for N/2 seconds. I want to the progress bar to be full for N seconds, not for N/2. If you can help me, I'd be grateful. Problem is in the curiProgress function. Here is my code.
{
public class beze2 extends Activity{
String FILENAME = "HighScore";
FileOutputStream fos;
private boolean tocan = false;
private int c, progressStatus=400, id_odgovor, rezultat;
private myCountDownTimer timer;
private static int myProgress=400;
private ProgressBar progressBar;
private Handler myHandler=new Handler();
private TextView text, t;
private int[] b;
private String d, f, strin;
private ArrayList numbers;
private ArrayList<Pitanja> pitanja;
private ArrayList<Odgovor> odgovori;
private TestAdapter mDbHelper;
private Random r;
private LinearLayout ln;
LinearLayout.LayoutParams buttonParams;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getIntents();
initializeVariables();
dodajVrijednostiUb();
postaviPitanje();
postaviOdgovore();
curiProgress();
}
private void getIntents(){
Intent i = getIntent();
String reza = i.getStringExtra("REZULTAT");
strin = i.getStringExtra("EXTRA_M");
rezultat = Integer.parseInt(reza);
}
private void initializeVariables(){
progressBar=(ProgressBar)findViewById(R.id.myProgress);
text = (TextView) findViewById(R.id.vrijeme);
timer = new myCountDownTimer(20*1000,1*1000);
numbers = new ArrayList();
mDbHelper = new TestAdapter(this);
mDbHelper.createDatabase();
mDbHelper.open();
pitanja = mDbHelper.getPitanje(Integer.parseInt(strin));
b = new int[pitanja.size()];
t = (TextView) findViewById(R.id.text_pitanja);
myProgress=400;
r = new Random();
progressBar.setMax(400);
ln = (LinearLayout) findViewById(R.id.layoutOdgovori);
buttonParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
}
private void curiProgress(){
new Thread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
while(progressStatus>=0)
{
progressStatus=performTask();
myHandler.post(new Runnable()
{
public void run() {
progressBar.setProgress(progressStatus);
}
});
}
myHandler.post(new Runnable() {
#Override
public void run() {
progressStatus=0;
myProgress=0;
}
});
}
private int performTask()
{
try {
//---Do some task---
Thread.sleep(50);
} catch (InterruptedException e)
{
e.printStackTrace();
}
return --myProgress;
}
}).start();
}
private void dodajVrijednostiUb(){
for (int z=0;z<pitanja.size(); z++){
b[z] = pitanja.get(z).getId_pitanja();
numbers.add(b[z]);
}
}
private void postaviPitanje(){
while (!numbers.contains(c)){
c = r.nextInt(22) + 1;
}
for (int i=0;i<pitanja.size(); i++){
if (c==b[i]){
d = pitanja.get(i).getTekst_pitanja();
id_odgovor = pitanja.get(i).getOdgovor();
}
}
t.setText(d);
}
private void postaviOdgovore(){
odgovori = mDbHelper.getOdgovor(c);
for (int i = 0; i<odgovori.size(); i++){
final Button bt = new Button(this);
bt.setId(odgovori.get(i).getId_odgovor());
bt.setBackgroundResource(getResources().getIdentifier("buttoni", "drawable", getPackageName()));
final String text = odgovori.get(i).getOdgovor();
int l = odgovori.get(i).getId_odgovor();
final String s = Integer.toString(l);
bt.setText(text);
buttonParams.setMargins(20, 5, 20, 5);
bt.setLayoutParams(buttonParams);
ln.addView(bt);
bt.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
f = Integer.toString(id_odgovor);
if (f.equals(s)){
tocan = true;
bt.setTextColor(Color.GREEN);
} else {
tocan = false;
bt.setTextColor(Color.RED);
Button newbutton = (Button) findViewById(id_odgovor);
newbutton.setTextColor(Color.GREEN);
}
timer.cancel();
if (tocan){
rezultat++;
timer.cancel();
Toast.makeText(beze2.this, "Tocan odgovor, vas score je " + Integer.toString(rezultat), Toast.LENGTH_SHORT).show();
Intent i = new Intent(getApplicationContext(), beze2.class);
i.putExtra("REZULTAT", Integer.toString(rezultat));
i.putExtra("EXTRA_M", strin);
startActivity(i);
}
else {
Toast.makeText(beze2.this, "Netocan odgovor, vas konacni score je " + Integer.toString(rezultat), Toast.LENGTH_SHORT).show();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
upisiDatoteku("Guest", rezultat);
Intent i = new Intent(beze2.this, MainActivity.class);
startActivity(i);
}
}
}
});
}
timer.start();
}
private void upisiDatoteku(String s, int rez){
try {
fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
String newOne = s + "\t" + Integer.toString(rez);
fos.write(newOne.getBytes());
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public class myCountDownTimer extends CountDownTimer{
public myCountDownTimer(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
#Override
public void onFinish() {
text.setText("Time's up");
myHandler.post(new Runnable(){
#Override
public void run() {
try {
Thread.sleep(3000);
Intent i = new Intent(beze2.this, beze.class);
startActivity(i);
Toast.makeText(beze2.this, "Isteklo vam je vrijeme, Vas score je " + Integer.toString(rezultat), Toast.LENGTH_SHORT).show();
upisiDatoteku("Guest",rezultat);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
}
#Override
public void onTick(long millisUntilFinished) {
int i = (int) millisUntilFinished / 1000;
text.setText(Integer.toString(i));
}
}

Using handler to change ui, still "only the original thread that created a view hierarchy can touch its views." error

I have two threads, two handlers. From thread i check a random number and send result to handle to update ui. But i am getting the error "only the original thread that created a view hierarchy can touch its views.". I searched some articles, they tell to use handler. I am doing that, yet can not avoid the errors.
After some checking, I found that it crashes when A sends the result. In case of B, it works
Also, can i use one handler for two thread?
public class MainActivity extends Activity implements View.OnClickListener{
Button start;
TextView status_B, status_A;
Boolean isRunning;
Thread Athread, Bthread;
int a, b;
Handler a_Handler, b_Handler;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Initialize variables
start = (Button) findViewById(R.id.button);
start.setOnClickListener(this);
status_B = (TextView) findViewById(R.id.textView);
status_A = (TextView) findViewById(R.id.textView1);
a_Handler = new Handler() {
public void handleMessage(Message msg)
{
int number = msg.getData().getInt("number");
String winner = msg.getData().getString("winner");
start.setEnabled(true);
isRunning = false;
status_A.setText(winner + number);
}
};
b_Handler = new Handler() {
public void handleMessage(Message msg)
{
int number = msg.getData().getInt("number");
String winner = msg.getData().getString("winner");
start.setEnabled(true);
isRunning = false;
status_B.setText(winner + number);
}
};
}
#Override
protected void onStart() {
super.onStart();
isRunning = false;
}
#Override
public void onClick(View v) {
start.setEnabled(false);
status_B.setText("Guessing...");
if (!isRunning)
{
Athread = new Thread(new Runnable() {
#Override
public void run() {
while (isRunning)
{
try
{
Athread.sleep(1000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
a = (int) (Math.random()*1000);
System.out.println("a "+ a);
if(a%7 == 0) {
isRunning = false;
Bundle bundle = new Bundle();
bundle.putString("winner", "A");
bundle.putInt("number", a);
Message msg = a_Handler.obtainMessage();
msg.setData(bundle);
a_Handler.handleMessage(msg);
}
}
}
});
Bthread = new Thread(new Runnable() {
#Override
public void run() {
while(isRunning)
{
try
{
Bthread.sleep(1000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
b = (int) (Math.random()*1000);
System.out.println("b "+ b);
if(b%7 == 0) {
isRunning = false;
Bundle bundle = new Bundle();
bundle.putString("winner", "B");
bundle.putInt("number", b);
Message msg = b_Handler.obtainMessage();
msg.setData(bundle);
b_Handler.sendMessage(msg);
}
}
}
});
isRunning = true;
Athread.start();
Bthread.start();
}
}
}

You need put your code to modify views on UI thread:
a_Handler = new Handler() {
public void handleMessage(Message msg)
{
final int number = msg.getData().getInt("number");
final String winner = msg.getData().getString("winner");
runOnUiThread(new Runnable() {
#Override
public void run() {
start.setEnabled(true);
status_A.setText(winner + number);
}
});
isRunning = false;
}
};
b_Handler = new Handler() {
public void handleMessage(Message msg)
{
final int number = msg.getData().getInt("number");
final String winner = msg.getData().getString("winner");
runOnUiThread(new Runnable() {
#Override
public void run() {
start.setEnabled(true);
status_B.setText(winner + number);
}
});
isRunning = false;
}
};

Load record at scrolllistview

I need to prevent against lazy load in my custom list-view. so i found that scrollview onscroll listner are helpfull over there i have tryed it but not getting success to implement this functionality.
Code:
lviewAdapter = new ListViewAdapter(SaxParser2.this, Arr_ActivityName, Arr_AudioScript,Arr_RequestID,Arr_FolderPath,Arr_RequestTo);
lview.setOnScrollListener(SaxParser2.this);
#Override
public void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
lview.setAdapter(lviewAdapter);
}
#Override
public void onScrollStateChanged(AbsListView arg0, int arg1) {
// TODO Auto-generated method stub
}
here is my BaseAdapter
package com.RecordingApp;
import it.sauronsoftware.ftp4j.FTPClient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Typeface;
import android.graphics.drawable.AnimationDrawable;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.AsyncTask;
import android.os.CountDownTimer;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.Sharedpreferance.GMailSender;
public class ListViewAdapter extends BaseAdapter {
public static Activity context;
String title[];
String description[];
String RequestId[];
String Folderpath[];
String RequestTo[];
boolean b_Flag_Record_or_not = false;
boolean b_upload_or_not = false;
boolean start_or_not = false;
boolean start_play = false;
boolean upload_or_not = false;
boolean b_play_or_not = false;
boolean isplaying2 = false;
Thread welcomeThread,welcomeThread2;
int glob_position;
MediaPlayer mPlayer2;
int flag_stop_position;
AudioRecorder recorder;
AnimationDrawable frameAnimation, frameAnimation_play;
private static String mFileName = null;
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
Recording login = new Recording();
MediaPlayer MP_completeRequest = new MediaPlayer();
public ListViewAdapter(Activity context, String[] title,
String[] description, String[] req_id, String[] FolderPath,
String[] Arr_RequestTo) {
super();
this.context = context;
this.title = title;
this.description = description;
this.RequestId = req_id;
this.Folderpath = FolderPath;
this.RequestTo = Arr_RequestTo;
}
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtViewTitle;
TextView txtViewDescription;
Button record, stop, play, upload;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
glob_position = position;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listitem_row, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView
.findViewById(R.id.textView1);
holder.txtViewDescription = (TextView) convertView
.findViewById(R.id.textView2);
holder.record = (Button) convertView.findViewById(R.id.record);
holder.stop = (Button) convertView.findViewById(R.id.stop);
holder.play = (Button) convertView.findViewById(R.id.play1);
holder.upload = (Button) convertView
.findViewById(R.id.audio_upload);
holder.record.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (isplaying2 == true) {
} else {
if (b_Flag_Record_or_not == true) {
} else {
try {
holder.record.setBackgroundResource(R.drawable.record_green);
b_Flag_Record_or_not = true;
b_play_or_not = true;
flag_stop_position = position;
AuthHandler dataHandler = new AuthHandler();
AuthDataset dataset = dataHandler
.getParsednewJobdtl_DataSet();
// Login l = new Login();
String str_useid = RequestTo[position];
recorder = new AudioRecorder(
"/audiometer/shanesh"
+ RequestId[position] + "-"
+ str_useid);
start_or_not = true;
recorder.start();
Toast.makeText(context, "Recording Started",
Toast.LENGTH_LONG).show();
CountDownTimer countDowntimer = new CountDownTimer(
120000000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
try {
Toast.makeText(
context,
"Stop recording Automatically ",
Toast.LENGTH_LONG).show();
recorder.stop();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
countDowntimer.start();
} catch (IOException e) {
gotoGmail(e);
} catch (Exception e) {
gotoGmail(e);
}
}
}
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
Typeface face = Typeface.createFromAsset(context.getAssets(),
"fonts/tahoma.ttf");
holder.txtViewTitle.setTypeface(face);
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}
holder.stop.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
if (isplaying2 == true) {
mPlayer2.stop();
isplaying2 = false;
} else {
holder.record.setBackgroundResource(R.drawable.page7_15);
if (flag_stop_position == position) {
b_Flag_Record_or_not = false;
if (start_or_not == true) {
b_play_or_not = false;
recorder.stop();
upload_or_not = true;
start_play = true;
Toast.makeText(context, "Stoped Recording",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context,
" Please Start recording ",
Toast.LENGTH_LONG).show();
}
} else {
}
}
} catch (Exception e) {
gotoGmail(e);
}
}
});
holder.play.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String temp = SaxParser2.str_completeORpendingFlag;
if (temp.equalsIgnoreCase("c")) {
try {
final MediaPlayer mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(Folderpath[position]);
mPlayer.prepare();
final int welcomeScreenDisplay = mPlayer
.getDuration();
welcomeThread = new Thread() {
int wait = 0;
#Override
public void run() {
try {
isplaying2 = true;
mPlayer.start();
while (wait < welcomeScreenDisplay) {
sleep(100);
wait += 100;
}
} catch (Exception e) {
} finally {
isplaying2 = false;
}
}
};
welcomeThread.start();
} catch (Exception e) {
gotoGmail(e);
}
} catch (Exception e) {
gotoGmail(e);
}
} else if (temp.equalsIgnoreCase("p")) {
try {
if (b_play_or_not == true) {
} else {
String str_useid = RequestTo[position];
java.io.File file = new java.io.File(Environment
.getExternalStorageDirectory()
+ "/audiometer/", "shanesh"
+ RequestId[position] + "-" + str_useid
+ ".amr");
if (file.exists()) {
Toast.makeText(context, "Playing",
Toast.LENGTH_LONG).show();
mPlayer2 = new MediaPlayer();
try {
mPlayer2.setDataSource(Environment
.getExternalStorageDirectory()
+ "/audiometer/shanesh"
+ RequestId[position]
+ "-"
+ str_useid + ".amr");
mPlayer2.prepare();
mPlayer2.start();
isplaying2 = true;
final int welcomeScreenDisplay = mPlayer2
.getDuration();
/**
* create a thread to show splash up to
* splash time
*/
welcomeThread = new Thread() {
int wait = 0;
#Override
public void run() {
try {mPlayer2.prepare();
while (wait < welcomeScreenDisplay) {
sleep(100);
wait += 100;
}
} catch (Exception e) {
} finally {
welcomeThread2 = new Thread() {
int wait = 0;
#Override
public void run() {
try {
mPlayer2.start();
while (wait < welcomeScreenDisplay) {
sleep(100);
wait += 100;
}
} catch (Exception e) {
} finally {
// frameAnimation_play.stop();
isplaying2 = false;
}
}
};
welcomeThread2.start();
}
}
};
welcomeThread.start();
} catch (Exception e) {
gotoGmail(e);
}
} else {
Toast.makeText(context, " File Not Found ",
Toast.LENGTH_LONG).show();
}
}
} catch (Exception e) {
gotoGmail(e);
}
}
}
});
holder.upload.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
glob_position = position;
// String str_useid = RequestTo[position];
if (upload_or_not == true) {
try {
new xyz().execute();
} catch (Exception e) {
gotoGmail(e);
}
}
}
});
return convertView;
}
private class xyz extends AsyncTask<Void, Void, Void> {
private final ProgressDialog dialog = new ProgressDialog(context);
protected void onPreExecute() {
try {
this.dialog.setMessage("Uploading...Please Wait..");
dialog.setIndeterminate(true);
dialog.setCancelable(false);
this.dialog.show();
// put your code which preload with processDialog
} catch (Exception e) {
gotoGmail(e);
}
}
#Override
protected Void doInBackground(Void... arg0) {
for (int i = 0; i < 100000; i++) {
}
it.sauronsoftware.ftp4j.FTPClient con = new it.sauronsoftware.ftp4j.FTPClient();
try {
String str_useid = RequestTo[glob_position];
con.connect("URL");
con.login("as", "asdasd");
con.changeDirectory("/rangam/RequestContent/audio");
con.setPassive(true);
con.setType(FTPClient.TYPE_BINARY);
con.upload(new java.io.File(Environment
.getExternalStorageDirectory()
+ "/audiometer/shanesh"
+ RequestId[glob_position] + "-" + str_useid + ".amr"));
String filename = "/shanesh" + RequestId[glob_position] + "-"
+ str_useid + ".amr";
con.logout();
con.disconnect(true);
String MachineName = Machinelist.str_Machinename;
sendFlagToServer(RequestId[glob_position], filename,
MachineName);
} catch (Exception e) {
gotoGmail(e);
}
return null;
}
protected void onPostExecute(final Void unused) {
if (this.dialog.isShowing()) {
try {
this.dialog.dismiss();
AlertDialog.Builder alertbox = new AlertDialog.Builder(
context);
alertbox.setTitle("Message");
alertbox.setMessage(":: Uploaded Successfully ::");
alertbox.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0,
int arg1) {
Intent intent_request = new Intent(context,
SaxParser2.class);
intent_request.putExtra("value", Machinelist.str_UIDValue);
intent_request.putExtra("machineName",
Machinelist.str_Machinename);
intent_request.putExtra("captureBack_or_not", 2);
context.startActivity(intent_request);
context.finish();
}
});
alertbox.show();
} catch (Exception e) {
gotoGmail(e);
}
}
}
}
private void sendFlagToServer(String requestID, String filename,
String machineName) {
HttpURLConnection connection;
OutputStreamWriter request = null;
String MachineName = Machinelist.str_Machinename;
URL url = null;
String parameters = "RequestID=" + requestID + "&FileName=" + filename
+ "&MachineName=" + MachineName + "&RequestType=A";
try {
url = new URL(
"URL");
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
connection.setRequestMethod("POST");
request = new OutputStreamWriter(connection.getOutputStream());
request.write(parameters);
request.flush();
request.close();
String line = "";
InputStreamReader isr = new InputStreamReader(
connection.getInputStream());
BufferedReader reader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
reader.close();
} catch (Exception e) {
gotoGmail(e);
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
try {
context.finish();
} catch (Exception e) {
gotoGmail(e);
}
}
return false;
}
void gotoGmail(Exception e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
}
}

Ok,
So first you'll have to define "what is the number of views I'd need to load in order my user not to see that it's lazy loading ?" :
Let's say, you'd want to load 20 rows...
Now in you onscroll, or wherever you want but somewhere like on scroll or Adapter.getView, you'll have to know what is displayed on screen at the moment... Let me explain :
I want to load 20 rows so my user doesn't notice,
I am display 10 of them
and 10 of them are just hidden (not displayed if the guy doesn't scroll).
Now, I wan't to load 10 more when the guy just hit my 15th row
What could be the best way to do that ???
Humm, let's see, trying to find something that returns the (ABSOLUTE) number of the last row displayed on screen - this could be a nice solution.
An otehr solution could be that your 10 or 15th row is the first one displayed on screen ?
etc, etc...
I think stuffs like that should do the trick. ;)

Here is a sample I grabbed from Net. It is loading the items by listening to the Scroll of the ListView . For sample it is loading dates in ListView. After reached the end position it will load next 15 dates. It is Never Ending List . You can modify the adapter to your custom adapter. The concept is:
You have set of data
Loading first n no of items
Set the scroll listener to the listview
If scroll reaches Last Visible Item in Listview , You trigger the worker thread to load additional m no of items.
Notify listview from an UI thread.
int itemsPerPage = 15;
boolean loadingMore = false;
ArrayList<String> myListItems;
ArrayAdapter<String> adapter;
//For test data :-)
Calendar d = Calendar.getInstance();
this.getListView().setOnScrollListener(new OnScrollListener(){
//useless here, skip!
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
//what is the bottom item that is visible
int lastInScreen = firstVisibleItem + visibleItemCount;
//is the bottom item visible & not loading more already ? Load more !
if((lastInScreen == totalItemCount) && !(loadingMore)){
Thread thread = new Thread(null, loadMoreListItems);
thread.start();
}
}
});
//Load the first 15 items
Thread thread = new Thread(null, loadMoreListItems);
thread.start();
}
//Runnable to load the items
private Runnable loadMoreListItems = new Runnable() {
#Override
public void run() {
//Set flag so we cant load new items 2 at the same time
loadingMore = true;
//Reset the array that holds the new items
myListItems = new ArrayList<String>();
//Get 15 new listitems
for (int i = 0; i < itemsPerPage; i++) {
//Fill the item with some bogus information
myListItems.add("Date: " + (d.get(Calendar.MONTH)+ 1) + "/" + d.get(Calendar.DATE) + "/" + d.get(Calendar.YEAR) );
// +1 day :-D
d.add(Calendar.DATE, 1);
}
//Done! now continue on the UI thread
runOnUiThread(returnRes);
}
};
//Since we cant update our UI from a thread this Runnable takes care of that!
private Runnable returnRes = new Runnable() {
#Override
public void run() {
//Loop thru the new items and add them to the adapter
if(myListItems != null && myListItems.size() > 0){
for(int i=0;i<myListItems.size();i++)
adapter.add(myListItems.get(i));
}
//Update the Application title
setTitle("Neverending List with " + String.valueOf(adapter.getCount()) + " items");
//Tell to the adapter that changes have been made, this will cause the list to refresh
adapter.notifyDataSetChanged();
//Done loading more.
loadingMore = false;
}
};
EDIT:
You can get tutorial and full project here

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

How to set Delay for loop in android? - android

Related

Android thread error

how to pause progressbar in android

Why does the progressbar accelerate whenever activity restarts

Using handler to change ui, still "only the original thread that created a view hierarchy can touch its views." error

Load record at scrolllistview

Categories

Resources