Develop Reference

How to select single item from listview and display resulted name of row in another activity

I got problem when trying to get checked item from listView through predefined xml layout simple_list_item_single_choice and select item then set text of a TextView that is in another activity.
This is my showMyUI method that call from MainActivity on click of TextView
dateRange.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Toast.makeText(MainActivity.this, "Range clicked",Toast.LENGTH_SHORT).show();
DateRangeClass day=new DateRangeClass(MainActivity.this,dayRangeSelected);
day.showMyUI();
overridePendingTransition(R.anim.right_to_left, R.anim.left_to_right);
}
});
And my DateRangeClass is
package tutorial.projecttwofilter;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class DateRangeClass {
Context context;
LinearLayout backButton;
ListView rangeList;
TextView rangeText;
String[] dateRangeData= new String[]{"Next 7 Days", "Next 14 Days", "Next 30 Days"};
public DateRangeClass(Context context,TextView rangeText) {
this.context = context;
this.rangeText=rangeText;
}
public void showMyUI(){
((Activity)context).setContentView(R.layout.daterange);
backButton= (LinearLayout) ((Activity)context).findViewById(R.id.backButton);
backButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
((Activity) context).finish();
((Activity) context).overridePendingTransition(R.anim.left_to_right, R.anim.right_to_left);
}
});
rangeList= (ListView) ((Activity)context).findViewById(R.id.dateRangeList);
ArrayAdapter<String> adapter= new ArrayAdapter<>(context, android.R.layout.simple_list_item_single_choice, dateRangeData);
rangeList.setAdapter(adapter);
rangeList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
rangeList.setItemChecked(position, true);
if(rangeList.isItemChecked(position))
Toast.makeText(context, "Checked item is"+rangeList.getCheckedItemPosition(), Toast.LENGTH_SHORT).show();
rangeText.setText("You new Change "+rangeList.getCheckedItemPosition());
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
Toast.makeText(context, "Nothing selected", Toast.LENGTH_SHORT).show();
}
});
}
}

Create DateRangeClass as an activity not as normal class and pass the information using bundle. As i can see you are passing textview instead of that you can pass text as string and can show in second activity.
To transfer data
String textToBesend = "Text from textview";
Intent i = new Intent(this, DateRangeActivity.class);
i.putExtra("text", textToBesend);
startActivity(i);
and to recieve data in DateRangeActivity write this in oncreate method.
Intent intent = getIntent();
String textPassedFromFirstActivity = intent.getExtras().getString("text");
You can refer below tutorial for your purpose hope it helps.
passing data to activity from listview

You have not started your activity.
Use startActivity and putIntent method on button click and in your second activity use getIntent method to display the text.

If statement depending on the random image shown

I have a imageview that randomly generate 1 out of 2 possibles images clicking on one button.
I want that when one image is showed (R.drawable.aa) and I press other button, a toast is shown.
My problem is that once a random image is shown and click on the other button, nothing happens.
package com.example.isaiasalarcon.menu;
import java.util.Random;
import java.util.jar.Attributes;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import static com.example.isaiasalarcon.menu.R.drawable.aa;
public class buho extends Activity {
// UI components
private Button drawButton;
private Button boton2;
private ImageView cardImage;
// Random object
private final static Random random = new Random();
// The card deck
private final static int[] cardDeck = new int[] {
R.drawable.aa,
R.drawable.a2,
};
private Integer q;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_buho);
drawButton = (Button)findViewById(R.id.drawButton);
boton2 = (Button)findViewById(R.id.button2);
cardImage = (ImageView)findViewById(R.id.cardImage);
drawButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0)
{
Integer q = cardDeck[random.nextInt(cardDeck.length)];
cardImage.setImageResource(q);
}
});
boton2.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
if (q.equals(R.drawable.aa)) {
Toast toast = Toast.makeText(buho.this, "si", Toast.LENGTH_LONG);
toast.show();
} else {
Toast toast = Toast.makeText(buho.this, "no", Toast.LENGTH_LONG);
toast.show();
}
}
});
}
}

two things:
1) Integer q I don't see a reason why this needs to be an Integer. You should be able to int
2) your q inside the onClick is creating a NEW variable called q. You need to update your code to the following: (note how it doesn't have the Type declaration before it, so it means to use the previously declared variable)
drawButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0)
{
q = cardDeck[random.nextInt(cardDeck.length)];
cardImage.setImageResource(q);
}
});

Image passing from one activity to another using extras

Would anyone tell me how to pass images from one activity to another activity using extras (the idea is). I am displaying a set of images in activity1 as a horizontal scroll view. When I click on an image it should be displayed in another activity (activity2) with totally different layout.
I'll be satisfied if the explanation is done with json as well I have tried this (http://www.vogella.com/tutorials/AndroidIntent/article.html) tutorial but can't really find the answer.
MAIN ACTIVITY:
package com.example.user.horizontal;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnClickListener {
ImageView Display;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView im1 = (ImageView) findViewById(R.id.image1);
ImageView im2 = (ImageView) findViewById(R.id.image2);
ImageView im3 = (ImageView) findViewById(R.id.image3);
ImageView im4 = (ImageView) findViewById(R.id.image4);
ImageView im5 = (ImageView) findViewById(R.id.image5);
ImageView im6 = (ImageView) findViewById(R.id.image6);
ImageView im7 = (ImageView) findViewById(R.id.image7);
im1.setOnClickListener(this);
im2.setOnClickListener(this);
im3.setOnClickListener(this);
im4.setOnClickListener(this);
im5.setOnClickListener(this);
im6.setOnClickListener(this);
im7.setOnClickListener(this);
}
public void onClick(View v) {
Intent clickimage = new Intent(this, OnClick.class);
switch (v.getId()) {
case R.id.image1:
Display.setImageResource(R.drawable.images1);
clickimage.putExtra("display1", "images1");
startActivity(clickimage);
break;
case R.id.image2:
Display.setImageResource(R.drawable.images2);
clickimage.putExtra("display2", "pic2filename");
startActivity(clickimage);
break;
case R.id.image3:
Display.setImageResource(R.drawable.images8);
clickimage.putExtra("display3", "pic3filename");
startActivity(clickimage);
break;
case R.id.image4:
Display.setImageResource(R.drawable.images4);
clickimage.putExtra("display4", "pic4filename");
startActivity(clickimage);
break;
case R.id.image5:
Display.setImageResource(R.drawable.images5);
clickimage.putExtra("display5", "pic5filename");
startActivity(clickimage);
break;
case R.id.image6:
Display.setImageResource(R.drawable.images6);
clickimage.putExtra("display6", "pic6filename");
startActivity(clickimage);
break;
case R.id.image7:
Display.setImageResource(R.drawable.images8);
clickimage.putExtra("display7", "pic7filename");
startActivity(clickimage);
break;
}
}
SECOND ACTIVITY :
package com.example.user.horizontal;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;
public class OnClick extends Activity{
private Bitmap mImage1;
private Bitmap mImage2;
private Bitmap mImage3;
private Bitmap mImage4;
private Bitmap mImage5;
private Bitmap mImage6;
private Bitmap mImage7;
private Bitmap mImage8;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.onclick);
Bundle bundle = getIntent().getExtras();
String imageName = bundle.getString("display");
// click listeners
ImageView imageView = (ImageView)findViewById(R.id.image1);
mImage1 = BitmapFactory.decodeResource(getResources(), R.drawable.images1);
mImage2 = BitmapFactory.decodeResource(getResources(), R.drawable.images2);
mImage3 = BitmapFactory.decodeResource(getResources(), R.drawable.images4);
mImage4 = BitmapFactory.decodeResource(getResources(), R.drawable.images5);
mImage5 = BitmapFactory.decodeResource(getResources(), R.drawable.images6);
mImage6 = BitmapFactory.decodeResource(getResources(), R.drawable.images7);
mImage7 = BitmapFactory.decodeResource(getResources(), R.drawable.images8);
mImage8 = BitmapFactory.decodeResource(getResources(), R.drawable.images);
if(imageName.matches("images1")) {
String b = bundle.getString("b");
imageView.setImageBitmap(mImage1);
}
else if (imageName.matches("pic2filename")) {
imageView.setImageBitmap(mImage2);
}
else if (imageName.matches("pic3filename")) {
imageView.setImageBitmap(mImage3);
}
else if (imageName.matches("pic4filename")) {
imageView.setImageBitmap(mImage4);
}
else if (imageName.matches("pic2filename")) {
imageView.setImageBitmap(mImage5);
}
else if (imageName.matches("pic5filename")) {
imageView.setImageBitmap(mImage6);
}
else if (imageName.matches("pic6filename")) {
imageView.setImageBitmap(mImage7);
}
else if (imageName.matches("pic7filename")) {
imageView.setImageBitmap(mImage8);
}
}
}
I am new to Java and Android.

Try passing the image file path or image url to next activity using extras in android

Pass Bitmap using intent :
Intent intent = new Intent(this, NewActivity.class);
intent.putExtra("BitmapImage", bitmap);
and retrieve it on the other end:
Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");

Don't pass images between activities.
You should pass the path to image in Intent and show it in your new Activity. This is a correct way to do it.

Listview not displaying the right image in android

In my app I have a listview. Each listview item contains an image view and several textviews. To display the image I use Drawable. But the images are displayed in the wrong row when scrolling. The image in a row changes several times until the right image appears. I have searched the web but I found nothing working for me. I am posting my code below. Please help me! Thanks in advance!
MainActivity.java
package com.makemyandroidapp.example.stacksites;
import java.io.FileNotFoundException;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
private SitesAdapter mAdapter;
private ListView sitesList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i("StackSites", "OnCreate()");
setContentView(R.layout.activity_main);
//Get reference to our ListView
sitesList = (ListView)findViewById(R.id.sitesList);
//Set the click listener to launch the browser when a row is clicked.
sitesList.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int pos,long id) {
String posID = mAdapter.getItem(pos).getID();
Intent i = new Intent(getApplicationContext(), PositionDesc.class);
i.putExtra("posID", posID);
startActivity(i);
}
});
/*
* If network is available download the xml from the Internet.
* If not then try to use the local file from last time.
*/
if(isNetworkAvailable()){
Log.i("StackSites", "starting download Task");
SitesDownloadTask download = new SitesDownloadTask();
download.execute();
}else{
mAdapter = new SitesAdapter(getApplicationContext(), -1, SitesXmlPullParser.getStackSitesFromFile(MainActivity.this, "StackSites.xml"));
sitesList.setAdapter(mAdapter);
}
}
//Helper method to determine if Internet connection is available.
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
/*
* AsyncTask that will download the xml file for us and store it locally.
* After the download is done we'll parse the local file.
*/
private class SitesDownloadTask extends AsyncTask<Void, Void, Void>{
#Override
protected Void doInBackground(Void... arg0) {
//Download the file
try {
Downloader.DownloadFromUrl("https://duapune.com/mobile/listaeplote.php", openFileOutput("StackSites.xml", Context.MODE_PRIVATE));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result){
//setup our Adapter and set it to the ListView.
mAdapter = new SitesAdapter(MainActivity.this, -1, SitesXmlPullParser.getStackSitesFromFile(MainActivity.this, "StackSites.xml"));
sitesList.setAdapter(mAdapter);
Log.i("StackSites", "adapter size = "+ mAdapter.getCount());
}
}
#Override
public void onBackPressed() {
// TODO Auto-generated method stub
Intent objIntent = new Intent(getApplication(), TabActivity.class);
finish();
startActivity(objIntent);
}
}
SitesAdapter.java
package com.makemyandroidapp.example.stacksites;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.List;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.view.View.OnClickListener;
/*
* Custom Adapter class that is responsible for holding the list of sites after they
* get parsed out of XML and building row views to display them on the screen.
*/
public class SitesAdapter extends ArrayAdapter<StackSite> {
//ImageLoader imageLoader;
//DisplayImageOptions options;
Context c;
String url1;
String url2;
Drawable backgr;
ImageView iconImg;
int posi;
RelativeLayout row;
public SitesAdapter(Context ctx, int textViewResourceId, List<StackSite> sites) {
super(ctx, textViewResourceId, sites);
c=ctx;
}
#Override
public View getView(int pos, View convertView, ViewGroup parent){
posi=pos;
row = (RelativeLayout)convertView;
Log.i("StackSites", "getView pos = " + pos);
if(null == row){
//No recycled View, we have to inflate one.
LayoutInflater inflater = (LayoutInflater)parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = (RelativeLayout)inflater.inflate(R.layout.row_site, null);
}
//Get our View References
final TextView kompaniaTxt = (TextView)row.findViewById(R.id.nameTxt);
TextView pozicioniTxt = (TextView)row.findViewById(R.id.aboutTxt);
final TextView kategoriaTxt = (TextView)row.findViewById(R.id.kategoriaTxt);
TextView qytetiTxt = (TextView)row.findViewById(R.id.qytetiTxt);
//final ProgressBar indicator = (ProgressBar)row.findViewById(R.id.progress);
kompaniaTxt.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//String emri_komp=kompaniaTxt.getText().toString().replaceAll("\\s+","%20");
String emri_komp=kompaniaTxt.getText().toString();
Intent intent=new Intent(c,CompanyDesc.class);
intent.putExtra("emri_komp", emri_komp);
intent.putExtra("url1", url1);
c.startActivity(intent);
}
});
kategoriaTxt.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
String idKateg=getItem(posi).getIdKategoria();
Intent intent=new Intent(c,CategoryList.class);
intent.putExtra("idKateg", idKateg);
intent.putExtra("url2", url2);
c.startActivity(intent);
}
});
//Set the relavent text in our TextViews
kompaniaTxt.setText(getItem(pos).getKompania());
pozicioniTxt.setText(getItem(pos).getPozicioni());
kategoriaTxt.setText(getItem(pos).getKategoria());
qytetiTxt.setText(getItem(pos).getQyteti());
url1=getItem(pos).getImgUrl();
SitesDownloadTask download=new SitesDownloadTask();
download.execute();
return row;
}
private class SitesDownloadTask extends AsyncTask<Void, Void, Void>{
#Override
protected Void doInBackground(Void... arg0) {
try { iconImg = (ImageView)row.findViewById(R.id.iconImg);
backgr=drawable_from_url(url1,"kot");
//backgr=drawable_from_url("https://duapune.com/photos/duapune#duapune.com1349707357.png","kot");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result){
iconImg.setBackground(backgr);
}
Drawable drawable_from_url(String url, String src_name) throws
java.net.MalformedURLException, java.io.IOException
{System.out.println("uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu");
return Drawable.createFromStream(((java.io.InputStream)
new java.net.URL(url.trim()).getContent()), src_name);
}
}
}

Try this..
You have to use ViewHolder for that issue
private class ViewHolder {
ImageView iconImg;
TextView kompaniaTxt,pozicioniTxt,kategoriaTxt,qytetiTxt;
}
EDIT
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = getActivity().getLayoutInflater().inflate(R.layout.row_site, parent, false);
holder = new ViewHolder();
holder.iconImg = (ImageView) view.findViewById(R.id.iconImg);
holder.kompaniaTxt = (TextView) view.findViewById(R.id.nameTxt);
holder.pozicioniTxt = (TextView) view.findViewById(R.id.aboutTxt);
//holder.kategoriaTxt = (TextView) view.findViewById(R.id.kategoriaTxt);
holder.qytetiTxt = (TextView) view.findViewById(R.id.qytetiTxt);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.kompaniaTxt.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//String emri_komp=kompaniaTxt.getText().toString().replaceAll("\\s+","%20");
String emri_komp=holder.kompaniaTxt.getText().toString();
Intent intent=new Intent(c,CompanyDesc.class);
intent.putExtra("emri_komp", emri_komp);
intent.putExtra("url1", url1);
c.startActivity(intent);
}
});
holder.kategoriaTxt.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
String idKateg=getItem(posi).getIdKategoria();
Intent intent=new Intent(c,CategoryList.class);
intent.putExtra("idKateg", idKateg);
intent.putExtra("url2", url2);
c.startActivity(intent);
}
});
//Set the relavent text in our TextViews
holder.kompaniaTxt.setText(getItem(pos).getKompania());
holder.pozicioniTxt.setText(getItem(pos).getPozicioni());
holder.kategoriaTxt.setText(getItem(pos).getKategoria());
holder.qytetiTxt.setText(getItem(pos).getQyteti());
url1=getItem(pos).getImgUrl();
SitesDownloadTask download=new SitesDownloadTask();
download.execute();
return view;
}
and onPostExecute
#Override
protected void onPostExecute(Void result){
holder.iconImg.setBackground(backgr);
}
EDIT
Instead of using SitesDownloadTask AsyncTask use Universal Image Loader lib
https://github.com/nostra13/Android-Universal-Image-Loader
lazy image loader
https://github.com/thest1/LazyList

Android Development - Buttons react slowly

Question is about android development, more exactly it is about buttons and cumstom views.
I'm using four buttons in Linear Layouts and one custom view in which I draw images.
When I use method to do this (I override onDraw() ) everything works just fine, except my buttons react quite slow on pressing them. Just removing the onDraw functions leaves them working quickly.
So, my questions are:
Why do those buttons work that slow? I just cant find out why!
Do I have to use self created buttons in the custom view?
And how to solve this?
Thsi is the class I use the onDraw Method:
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.ImageView;
public class test extends ImageView{
Context mContext;
String[] medium;
final int pspawn[]={64,32};
public test(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
}
private String getMapInfo(Integer counter){
String[] mapArray = TextUtils.split(map, " ");
return mapArray[counter];
}
public void onDraw(Canvas canvas){
int x = 0;
int y = 0;
for(int i = 0; i<100; i = i+1)
{
String mapinfo = getMapInfo(i);
if (mapinfo.equals("x"))
{
canvas.drawBitmap(BitmapFactory.decodeResource(mContext.getResources(),R.drawable.t1), x, y, null);
}
x = x + 32;
if (x == 320)
{
y = y + 32;
x = 0;
}
canvas.drawBitmap(BitmapFactory.decodeResource(mContext.getResources(),R.drawable.t3), pspawn[0], pspawn[1],null);
invalidate();
}
}
}
And this is my main class:
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class desimain extends Activity{
private Thread worker;
private Runnable newMsg;
private OnClickListener getKeystroke;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getKeystroke = new OnClickListener(){
public void onClick(View view) {
switch(view.getId()){
case R.id.Up:
worker = new Thread(newMsg);
worker.start();
break;
case R.id.Down:
Toast.makeText(getApplicationContext(), "Down", Toast.LENGTH_SHORT).show();
break;
case R.id.Left:
Toast.makeText(getApplicationContext(), "Left", Toast.LENGTH_SHORT).show();
break;
case R.id.Right:
Toast.makeText(getApplicationContext(), "Right", Toast.LENGTH_SHORT).show();
break;
}
};
};
Button pressUp = (Button) findViewById (R.id.Up);
pressUp.setOnClickListener(getKeystroke);
Button pressDown = (Button) findViewById (R.id.Down);
pressDown.setOnClickListener(getKeystroke);
Button pressLeft = (Button) findViewById (R.id.Left);
pressLeft.setOnClickListener(getKeystroke);
Button pressRight = (Button) findViewById (R.id.Right);
pressRight.setOnClickListener(getKeystroke);
newMsg = new Runnable(){
public void run() {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "Up", Toast.LENGTH_SHORT).show();
}
});
}
};
}
}
PS: I know this code isnt very beautiful, but at the moment i just try to figure out the basics I need...

Your buttons do not respond because you are taking up much too much time on the main application thread in your onDraw() method. Please cache your bitmaps rather than loading files from flash 200 times per draw.