I have many activities which have 1 resultant activity. Does anyone know how to separate it, the result will display one result from many activity. If i run it it will display result fruitQuestion and AnimalQuestion.
Test.java:
public class Test extends Activity {
Button btnFruitQ,btnAnimalQ;
ToggleButton tb;
public static boolean tbflag;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
btnFruitQ = (Button) findViewById(R.id.btnFruitQ);
btnAnimalQ = (Button) findViewById(R.id.btnAnimalQ);
tb = (ToggleButton) findViewById(R.id.ToggleButton);
btnFruitQ.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
tbflag=tb.isChecked();
startActivity(new Intent(Test.this, FruitQuestion.class));
}
});
btnAnimalQ.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
tbflag=tb.isChecked();
startActivity(new Intent(Test.this, AnimalQuestion.class));
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_test, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
FruitQuestion.java:
public class FruitQuestion extends Activity {
TextView tv;
Button btnNext;
RadioGroup rg;
RadioButton bt1,bt2,bt3;
String Question[]={"HAHA","HAHA2","HAHA3"};
String ans[]={"i1","12","i3"};
String opt[]={"i1","lali","uu","12","hehe","oo","i3","jj","cc"};
int flag=0;
public static int mark,correct,wrong;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fruit_question);
tv=(TextView) findViewById(R.id.tvque);
btnNext=(Button) findViewById(R.id.btnNext);
rg = (RadioGroup) findViewById(R.id.rg);
bt1 = (RadioButton) findViewById(R.id.btn1);
bt2 = (RadioButton) findViewById(R.id.btn2);
bt3 = (RadioButton) findViewById(R.id.btn3);
tv.setText(Question[flag]);
bt1.setText(opt[0]);
bt2.setText(opt[1]);
bt3.setText(opt[2]);
Toast.makeText(this,"Negative Mark : "+Test.tbflag,1000).show();
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RadioButton uans=(RadioButton)findViewById(rg.getCheckedRadioButtonId());
String ansText= uans.getText().toString();
if (ansText.equalsIgnoreCase(ans[flag]))
{
correct++;
}
else
{
wrong++;
}
flag++;
if(flag<Question.length)
{
tv.setText(Question[flag]);
bt1.setText(opt[flag*3]);
bt2.setText(opt[(flag*3)+1]);
bt3.setText(opt[(flag*3)+2]);
}
else
{
if(Test.tbflag)
{
mark=correct-wrong;
}
else
{
mark=correct;
}
Intent in=new Intent(getApplicationContext(),ResultActivity.class);
startActivity(in);
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_fruit_question, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
ResultActivity.java:
public class ResultActivity extends Activity {
TextView tv;
Button btnRestart;
StringBuffer sb=new StringBuffer();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
tv=(TextView)findViewById(R.id.tvres);
btnRestart=(Button)findViewById(R.id.btnRestart);
sb.append("Correct Answer : " + FruitQuestion.correct);
sb.append("\nWrong Answer : " + FruitQuestion.wrong);
sb.append("\nFinal Score : " + FruitQuestion.mark);
tv.setText(sb);
FruitQuestion.correct = 0;
FruitQuestion.wrong = 0;
sb.append("Correct Answer : "+AnimalQuestion.correct);
sb.append("\nWrong Answer : "+AnimalQuestion.wrong);
sb.append("\nFinal Score : " + AnimalQuestion.mark);
tv.setText(sb);
AnimalQuestion.correct=0;
AnimalQuestion.wrong=0;
btnRestart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent in=new Intent(getApplicationContext(),Test.class);
startActivity(in);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_result, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
You can use Intent Extras to tell ResultActivity which Activity called it, and display the corresponding results.
Note that you should also re-factor your code so that you're not using static variables in the Activities to store data, you could use SharedPreferences instead.
Just to get you started though, here is what you could do in the short term:
In FruitQuestion, you would have:
Intent in=new Intent(getApplicationContext(),ResultActivity.class);
in.putExtra("question", "fruit");
startActivity(in);
And in AnimalQuestion, you would have:
Intent in=new Intent(getApplicationContext(),ResultActivity.class);
in.putExtra("question", "animal");
startActivity(in);
Then, in ResultActivity, capture the Intent Extra, and show corresponding result:
Bundle extras = this.getIntent().getExtras();
if (extras != null){
String question = extras.getString("question");
if (question.equals("fruit")) {
sb.append("Correct Answer : " + FruitQuestion.correct);
sb.append("\nWrong Answer : " + FruitQuestion.wrong);
sb.append("\nFinal Score : " + FruitQuestion.mark);
tv.setText(sb);
FruitQuestion.correct = 0;
FruitQuestion.wrong = 0;
}
else if (question.equals("animal")) {
sb.append("Correct Answer : " + AnimalQuestion.correct);
sb.append("\nWrong Answer : " + AnimalQuestion.wrong);
sb.append("\nFinal Score : " + AnimalQuestion.mark);
tv.setText(sb);
AnimalQuestion.correct = 0;
AnimalQuestion.wrong = 0;
}
}
Firstly, give your Intent instance a different name. Other than in. You can put extra in intent object and send it to ResultActivity
Like this
Intent intent = new Intent(getApplicationContext(),ResultActivity.class);
intent.putExtra("activityName", "FruitQuestion");
startActivity(intent);
In ResultActivity
Intent intent = getIntent();
String activityName = intent.getStringExtra("activityName");
Check your activityName value and show its results.
I think I understand you, you want to pass some values from A-activity to B-activity.
To pass data between activities, you can use the same intent you are sending.
Here an example:
Intent i = new Intent(this, ActivityA.class);
i.putExtra("key1", value1);
i.putExtra("key2", value2);
startActivity(i);
putExtra method allow pass multiples kinds of value, like boolean, string, integer...
Then, in the another activity, in onCreate method, you can get this value this way:
String save = getIntent().getExtras().getString("key1");
Or
Bundle bundle = getIntent().getExtras();
boolean check = bundle.getBoolean("key2");
I hope it help you :)
Related
I have a first activity ("Home"), with two buttons: one is called About and leads to activity About and the second is named List and leads to the activity List.
Manifest.xml should be fine, but I get a load of tiny petty errors I can't fix up by myself, regrettably.
Home.class is the following
Public class Home extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Button AboutButton = (Button)findViewById(R.id.About);
AboutButton.setOnClickListener(new View.OnClickListener()){
#Override
public void onClick(View view); {
Intent openAbout = new Intent(Home.this, About.class);
startActivity(openAbout);
}
}
Button ListButton = (Button)findViewById(R.id.List);
ListButton.setOnClickListener(new View.onClickListener());{
#Override
public void onClick(View view); {
Intent openList = new Intent(Home.this, List.class);
startActivity(openList);
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_home, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
while About.class is like this
public class About extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_about);
Button ReturnButton = (Button)findViewById(R.id.Return);
ReturnButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent returnhome = new Intent(About.this, Home.class);
startActivity(returnhome);
}
public void onClick(View view); {
Intent returnhome = new Intent(About.this, Home.class);
startActivity(returnhome);
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_about, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
and List is like this:
public class List extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
Button ReturnButton = (Button)findViewById(R.id.Return);
ReturnButton.setOnClickListener(new View.OnClickListener()){
#Override
public void onClick(View view) {
Intent returnhome = new Intent(About.this, Home.class);
startActivity(returnhome);
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_list, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
I get lot of red light bulbs, saying, for instance that ")" or ";" is expected or (worse) onClickListener cannot be resolved
Last but not least: I copied this code online and I was wondering why after "View" there is a "view"; what does it mean?
I copied your code and I see fails everywhere... let me explain you what's going on ...
HOME CLASS
1.- You have to remove the ")"
2.- You don't have to ";" when you call onClick()
3.- When you are don on your onClick() NOW you have to close it, you missed the ");"
AboutButton.setOnClickListener(new View.OnClickListener()){ //<-- Just remove one
#Override
public void onClick(View view); { //<-- Remove this ";"
Intent openAbout = new Intent(Home.this, About.class);
startActivity(openAbout);
}
}//Here goes ");"
4.- The ListButton has the same issues so just fix it as you will fix the first one.
ABOUT CLASS
1.-On this case you have the setOnClickListener() ok, BUT why you have two onClick(View view)? It's not necessary just remove one of them.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_about);
Button ReturnButton = (Button) findViewById(R.id.Return);
ReturnButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent returnhome = new Intent(About.this, Home.class);
startActivity(returnhome);
}
});
}
LIST CLASS
1.-Well in your List class you have made the same error as the first one... Your onClickListener() it's wrong.
2.-Once again you included an unnecessary ")" on new View.OnClickListener() just remove it,
3.-Another fail that I'm seeing is that you are trying to make an Intent but you are refering that you are on About.this and you are NOT. You are on List class so you have ot put List.this because the first parameter refers :
A Context as its first parameter (this is used because the Activity class is a subclass of Context)
More information about Intents
4.- You need to close again the setOnClickListener()
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
Button ReturnButton = (Button)findViewById(R.id.Return);
ReturnButton.setOnClickListener(new View.OnClickListener()){ //<-- remove one ")"
#Override
public void onClick(View view) {
Intent returnhome = new Intent(About.this, Home.class); //<-- Remove About.this and put List.this
startActivity(returnhome);
}
}//<-- Close the setOnClickListener() with ");"
}
It's okay guy, this is your first question and I'll answer it, but NOW as I've made the favor to take my time and explain to you what was wrong on your code take your time to :
How do I as a question on StackOverflow
Learn some Android basics
And the most IMPORTANT THING
DO NOT COPY PASTE AN INTERNET CODE if you don't know the basics, I mean you can copy paste the code, but you'll face with this problem every time you do this, so first of all read the tutorial, make an examples, and you'll improve every day.
I have created a menu activity with 3 buttons (main,history,logout).
I do not know why all of buttons are not working and there's logout function.
Anyway i have no idea about logout function, is it right function or wrong function?
I am new to Android, any help will be appreciated.
Here is my code:
public class MenuActivity extends ActionBarActivity implements View.OnClickListener {
Button mainBtn,historyBtn,logoutBtn ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
mainBtn = (Button)findViewById(R.id.button1);
historyBtn = (Button)findViewById(R.id.button2);
logoutBtn = (Button)findViewById(R.id.button3);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.button1:
Intent main = new Intent (this, MainActivity2.class);
startActivity(main);
break;
case R.id.button2:
Intent history = new Intent(this, HistoryActivity.class);
startActivity(history);
break;
case R.id.button3:
Intent logout = new Intent(this, LoginActivity.class);
keluar.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(logout);
this.finish();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Have you done this?
mainBtn.setOnClickListener(this);
historyBtn.setOnClickListener(this);
logoutBtn.setOnClickListener(this);
i.e. Register the onClickListener for the buttons, either in code or within the xml file.
Set listner to all buttons like..
mainBtn.setOnClickListener(this);
You will need to register the buttons with the click listener. Replace your code with the following..
public class MenuActivity extends ActionBarActivity implements View.OnClickListener {
Button mainBtn,historyBtn,logoutBtn ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
mainBtn = (Button)findViewById(R.id.button1);
historyBtn = (Button)findViewById(R.id.button2);
logoutBtn = (Button)findViewById(R.id.button3);
// Register your buttons with the click listener
mainBtn.setOnClickListener(this);
historyBtn.setOnClickListener(this);
logoutBtn.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.button1:
Intent main = new Intent (this, MainActivity2.class);
startActivity(main);
break;
case R.id.button2:
Intent history = new Intent(this, HistoryActivity.class);
startActivity(history);
break;
case R.id.button3:
Intent logout = new Intent(this, LoginActivity.class);
keluar.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(logout);
this.finish();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
You didn't set a listener to your buttons.
mainBtn = (Button)findViewById(R.id.button1);
historyBtn = (Button)findViewById(R.id.button2);
logoutBtn = (Button)findViewById(R.id.button3);
mainBtn.setOnClickListener(this);
historyBtn.setOnClickListener(this);
logoutBtn.setOnClickListener(this);
Good Luck With your work. :)
mainBtn.setOnClickListener(this);
historyBtn.setOnClickListener(this);
logoutBtn.setOnClickListener(this);
Hi everyone I am currently developing an android app, I am having some confusions in the code, I have a main activity in which I store some array values.
I have two xml files(one mainactivity.xml and other the other one is listview.xml)
In main activity.xml there are four switches, when I click any particular switch it should take me to the listview.xml, with a corresponding array displayed on list view by list view adapter. The code is as follows
public class MainActivity extends ActionBarActivity {
ListView l;
Button chem = (Button) findViewById(R.id.button4);
public String[] contentc = {
"Abundance",
"Anxiety",
"Bruxism",
"Discipline",
"Drug Addiction"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
l= (ListView) findViewById(R.id.listview);
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_element, contentp);
chem.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
//DO SOMETHING! {RUN SOME FUNCTION ... DO CHECKS... ETC}
setContentView(R.layout.list);
l.setAdapter(adapter);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Intent intent = new Intent(activity2.this, activity1.class);
intent.putExtra("message", message);
startActivity(intent);
In activity1, in onCreate(), you can get the String message by retrieving a Bundle (which contains all the messages sent by the calling activity) and call getString() on it :
Bundle bundle = getIntent().getExtras();
String message = bundle.getString("message")
I have tried to retrieve data from Shared Preferences and tried to intent it over to my main activity where I want it to display the score the user got. There are no errors, it just doesn't save the best_score_number_tv or doesn't correctly send it over. I hope there isn't too much wrong :(
Main_Screen
public class Main_Screen extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_screen);
getSupportActionBar().hide();
//SETS CUSTOM FONT
TextView main_screen_titleone = (TextView)findViewById(R.id.main_screen_titleone);
TextView main_screen_titletwo = (TextView)findViewById(R.id.main_screen_titletwo);
TextView best_score_tv = (TextView)findViewById(R.id.best_score_tv);
TextView best_score_number_tv = (TextView)findViewById(R.id.best_score_number_tv);
Typeface myCustomFont = Typeface.createFromAsset(getAssets(), "fonts/LemonMilk.otf");
main_screen_titleone.setTypeface(myCustomFont);
main_screen_titletwo.setTypeface(myCustomFont);
best_score_tv.setTypeface(myCustomFont);
best_score_number_tv.setTypeface(myCustomFont);
//******************;
retrieveBestScore();
}
public void startTheGame(View view){
Intent intent = new Intent(this, press_screen.class);
startActivity(intent);
}
public void retrieveBestScore(){
Intent getBestScore = getIntent();
int BEST_SCORE = getBestScore.getIntExtra("BEST_SCORE", 0);
TextView best_score_number_tv = (TextView)findViewById(R.id.best_score_number_tv);
best_score_number_tv.setText(BEST_SCORE + "");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main__screen, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
press_screen
public class press_screen extends ActionBarActivity {
private int time_left;
private int amountOfTapsNumber;
private int bestScore;
TextView amountOfTaps;
TextView timeLeftNumber;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_press_screen);
getSupportActionBar().hide();
timer.start();
loadInfo();
}
//Create Timer
CountDownTimer timer = new CountDownTimer(21000, 1000) {
#Override
public void onTick(long millisUntilFinished) {
timeLeftNumber = (TextView) findViewById(R.id.time_left_number_tv);
time_left = Integer.valueOf(timeLeftNumber.getText().toString()) - 1;
timeLeftNumber.setText(time_left + "");
}
#Override
public void onFinish() {
bestScore = amountOfTapsNumber;
TextView best_score_number_tv = (TextView)findViewById(R.id.best_score_number_tv);
Intent sendBestScore = new Intent(press_screen.this, Main_Screen.class);
sendBestScore.putExtra("BEST_SCORE", bestScore);
Intent goBackToMainActivity = new Intent(press_screen.this, Main_Screen.class);
startActivity(goBackToMainActivity);
}
};
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_press_screen, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void triggerTapOnMainButton(View view) {
amountOfTaps = (TextView) findViewById(R.id.amount_of_taps);
amountOfTapsNumber = Integer.valueOf(amountOfTaps.getText().toString()) + 1;
amountOfTaps.setText(amountOfTapsNumber + "");
}
public void saveInfo(String key, int bestScore){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor edit = sp.edit();
edit.putInt("BEST_SCORE", bestScore);
edit.commit();
}
public void loadInfo(){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
int BEST_SCORE = sp.getInt("BEST_SCORE", 0);
}
}
If you want to use and Intent you should put the extra in the intent you pass to
startActivity
so
Intent goBackToMainActivity = new Intent(press_screen.this, Main_Screen.class);
goBackToMainActivity.putExtra("BEST_SCORE", bestScore);
startActivity(goBackToMainActivity);
Alternatively you could just save the score from your press_screen activity
after
bestScore = amountOfTapsNumber;
saveInfo("BEST_SCORE", bestScore);
Also, if you are going to pass in a key to save the info, you might consider using it
public void saveInfo(String key, int bestScore){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor edit = sp.edit();
edit.putInt(key, bestScore);
edit.commit();
}
And when retrieving
public int retrieveInt(String key){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
return sp.getInt(key, 0);
}
I have an activity which has an edit text which becomes visible when a button is clicked. I fill the edit text up and click another button. On clicking this button the edit text content must be sent to another activity.The first activity takes the edit text and queries a list of data from my Parse database and shows it in a ListView in the Second Activity.But whenever i click the first button(after entering the string) the app crashes.This is the first activity
public class MainActivity extends ActionBarActivity {
String name;
EditText search;
Button g;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpSpinners();
Parse.initialize(this, "AAh5US7zhbYyFBexsv07cjo34ZZiB7KNe9SuTv7e",
"eKUG1pYaV50hVyDC9d4qZc4qf1dCtOTqnX92eGJV");
PushService.setDefaultPushCallback(this, MainActivity.class);
ParseInstallation.getCurrentInstallation();
search = (EditText) findViewById(R.id.search);
g = (Button) findViewById(R.id.Go);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void byName(View v) {
search.setVisibility(View.VISIBLE);
search.requestFocus();
g.setVisibility(View.VISIBLE);
}
public void Go(View v) {
name = search.getText().toString();
final Intent i;
i = new Intent(MainActivity.this, ResterauntList1.class);
i.putExtra("restrauntName", name);
startActivity(i);
}
}
In the above byName is the onClick for making the EditText visible, and Go is the onClick for getting my EditText string and passing it to the next activity. The second activity is below
public class ResterauntList1 extends Activity {
String rValue;
ArrayAdapter<String> adapter;
ProgressDialog mProgressDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_resteraunt_list1);
Bundle bdl = getIntent().getExtras();
rValue = bdl.getString("restrauntName");
setContentView(R.layout.activity_resteraunt_list);
populateList(rValue, "name");
}
private void populateList(final String Value, final String Key) {
ParseQueryAdapter.QueryFactory<ParseObject> factory = new ParseQueryAdapter.QueryFactory<ParseObject>() {
#Override
#SuppressWarnings({ "unchecked", "rawtypes" })
public ParseQuery create() {
ParseQuery query = new ParseQuery("resdb");
query.whereEqualTo(Key, Value);
return query;
}
};
ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(
this, factory);
adapter.setTextKey("name");
adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
#Override
public void onLoading() {
mProgressDialog = new ProgressDialog(ResterauntList1.this);
mProgressDialog.setTitle("Searching for " + Value);
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.show();
}
#Override
public void onLoaded(List<ParseObject> objects, Exception e) {
mProgressDialog.dismiss();
}
});
final ListView listView = (ListView) findViewById(R.id.restListView1);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
ParseObject object = (ParseObject) listView
.getItemAtPosition(position);
String Id = object.getObjectId();
Intent i = new Intent(getApplicationContext(),
SingleRestraunt.class);
i.putExtra("restId", Id);
startActivity(i);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.resteraunt_list1, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
The error as stated above occurs when I click the Go button.The error is
09-02 14:58:46.443: E/AndroidRuntime(3061): Process: com.example.gastronomaapp, PID: 3061
09-02 14:58:46.443: E/AndroidRuntime(3061): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.gastronomaapp/com.example.gastronomaapp.ResterauntList1}: java.lang.NullPointerException
Any idea where I am making a mistake? The funniest thing almost the same code has worked in another part of my app. absolutely clueless whats wrong.
Bundle bdl = getIntent().getExtras();
rValue = bdl.getString("restrauntName");
change to
rValue = getIntent().getStringExtra("restrauntName");
You put the string directly on the intent, not packaged in a bundle.