How to let the user edit button's app link?

Question

I'm new to android developing, so guys i need your help. I've searched all over the internet but couldn't find the solution, so finally i decided to post here... Since I'm a newbie please give me more info as you can.

Here is what i'm doing...

I've few buttons on activity TEST, when the user long presses the buttons it will opens the

(MAIN_ACTIVITY)list of all apps installed. And when the user selects an app, it gets the

respective package name and returns to TEST activity. Now when the user clicks the button it will open the new app(which was selected earliear before returning to TEST activity).

In shortcut user should have the ability to edit the button dynamically like(app link,icon,title).

Now here is what my problem is...

I've abled to achieve the above but it only works on 1 button only. I mean other buttons do the same thing. And this is driving me crazy... If you guys need xml code, please let me know. Thanks in advance guys.

TEST ACTIVITY

package com.example.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.widget.Button;
import android.widget.ListView;

public class Test extends Activity implements OnLongClickListener,
    OnClickListener {

final int APPLIST_REQUEST_CODE = 12345;
final int APPLIST_REQUEST_CODE2 = 2;

String pac, pac2;

private ListView mListAppInfo;
Button bBrowser, bCalculator, bExit;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test);

    bBrowser = (Button) findViewById(R.id.bBrowser);
    bExit = (Button) findViewById(R.id.bExit);
    bCalculator = (Button) findViewById(R.id.bCalculator);

    bBrowser.setOnClickListener(this);
    bBrowser.setOnLongClickListener(this);

    bCalculator.setOnClickListener(this);
    bCalculator.setOnLongClickListener(this);

    bExit.setOnClickListener(this);
}

@Override
public void onClick(View arg0) {
    // TODO Auto-generated method stub
    switch (arg0.getId()) {
    case R.id.bBrowser:
        Intent i = getPackageManager().getLaunchIntentForPackage(pac);
        startActivity(i);

        break;
    case R.id.bCalculator:
        Intent i1 = getPackageManager().getLaunchIntentForPackage(pac2);
        startActivity(i1);

        break;
    case R.id.bExit:
        finish();
        break;
    }
}

@Override
public boolean onLongClick(View arg0) {
    // TODO Auto-generated method stub
    switch (arg0.getId()) {
    case R.id.bBrowser:
        Intent a = new Intent("android.intent.action.APP_LIST");
        startActivityForResult(a, APPLIST_REQUEST_CODE);

        break;
    case R.id.bCalculator:
        Intent a2 = new Intent("android.intent.action.APP_LIST");
        startActivityForResult(a2, APPLIST_REQUEST_CODE2);

        break;
    }
    return false;
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == APPLIST_REQUEST_CODE) {
        if (resultCode == Activity.RESULT_OK) {
            pac = data.getStringExtra("key");
        }
    } else if (requestCode == APPLIST_REQUEST_CODE2) {
        if (resultCode == Activity.RESULT_OK) {
            pac2 = data.getStringExtra("key");
        }
    }

}

@Override
public void onBackPressed() {
    // TODO Auto-generated method stub
    // super.onBackPressed();
}
}

MAIN ACTIVITY

package com.example.test;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

public class MainActivity extends Activity {
private ListView mListAppInfo;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_main);

    mListAppInfo = (ListView) findViewById(R.id.lvApps);
    AppInfoAdapter adapter = new AppInfoAdapter(this,
            Utilities.getInstalledApplication(this),     getPackageManager());
    mListAppInfo.setAdapter(adapter);

    mListAppInfo.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int pos,
                long id) {
            AppInfoAdapter appInfoAdapter = (AppInfoAdapter) parent
                    .getAdapter();
            ApplicationInfo appInfo = (ApplicationInfo) appInfoAdapter
                    .getItem(pos);



            Intent a = new Intent();
            a.putExtra("key", appInfo.packageName);
            setResult(Activity.RESULT_OK, a);
            finish();

        }
    });
}

}

Answer 1

First of all, your activitiy transitions are logically wrong. Read about activities and results. MainActivity serves Test, so Test should start MainActivity for result, and MainActivity should return that result to Test via onActivityResult. What you are doing instead is:

Test -> new MainActivity -> new Test

While it should be:

Test -> new MainActivity -> back to the old Test

About the buttons issue, both bCalculator and bBrowser do the same, which should be starting the package selected in MainActivity. Both buttons do the exact same thing in onClick, so why should they have different behavior?

Edit:

In Test, call MainActivity this way:

final int APPLIST_REQUEST_CODE = 12345;
Intent a = new Intent("android.intent.action.APP_LIST");
startActivityForResult(a, APPLIST_REQUEST_CODE);

In MainActivity, return the result this way:

Intent a = new Intent();
a.putExtra("key", appInfo.packageName);
setResult(Activity.RESULT_OK, a);
finish();

And back in Test, you get the result this way:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode == APPLIST_REQUEST_CODE) {
        if(resultCode == Activity.RESULT_OK) {
            String packageName = data.getStringExtra("key", "");
        }
    }
}

Edit 2: Getting and showing the package icon:

Add the icon resource ID and the package name to the result intent:

a.putExtra("icon", appInfo.icon);
a.putExtra("packageName", appInfo.packageName);

Get the icon this way:

int iconID = data.getIntExtra("icon", -1);
Drawable icon = getApplicationContext().getPackageManager().getResourcesForApplication(data.getStringExtra("packageName", "")).getDrawable(iconID);
bCalculator.setBackground(icon);