how to launch an app from another app in android

Question

I am developing an app in which i want to launch any application installed on my device. I have tried the following code.

Button bClock = (Button) findViewById(R.id.button1);
String app="com.whatsapp";
bClock.setOnClickListener(new OnClickListener() {
  public void onClick(View v) {
    Intent i = new Intent(Intent.ACTION_MAIN);
    PackageManager managerclock = getPackageManager();
    i = managerclock.getLaunchIntentForPackage(app);
    i.addCategory(Intent.CATEGORY_LAUNCHER);
    startActivity(i);
  }
});

It shows error:

Cannot refer to a non-final variable app inside an inner class defined in a different method

But if I directly use "com.whatsapp" instead of storing in String, it is working. Help me to solve this issue

issue with final variable. just declare the string app as global and refer in your button click — Ameer, Mar 27 '16 at 06:25
what do you mean by " refer in your button click" can you explain it in detail. I am new to android — luna, Mar 27 '16 at 07:37
Possible duplicate of [Launch an application from another application on Android](https://stackoverflow.com/questions/3872063/launch-an-application-from-another-application-on-android) — Mehdi Dehghani, Apr 18 '19 at 12:22

score 2 · Answer 1 · answered Mar 27 '16 at 06:24

2

Use the Following Function

public void startNewActivity(Context context, String packageName) {
    Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);
    if (intent != null) {
        // We found the activity now start the activity
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    } else {
        // Bring user to the market or let them choose an app?
        intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setData(Uri.parse("market://details?id=" + packageName));
        context.startActivity(intent);
    }
}

answered Mar 27 '16 at 06:24

Muhammad Younas

2,008
21
33

item=parent.getItemAtPosition(position).toString(); startNewActivity(aContext,item); I have used a spinner object to choose an app. The chosen app is stored in string variable. I have tried your solution . but it is not working – luna Mar 27 '16 at 07:28
which package name u send – Muhammad Younas Mar 27 '16 at 07:50
try to run the code by sending fix parameter so that u sure the code work – Muhammad Younas Mar 27 '16 at 07:51

score 2 · Answer 2 · answered Mar 27 '16 at 06:24

2

For your code correction please make String app="com.whatsapp"; a final variable or you can use package name directly like following

You should use the function of the package manager.

Context ctx=this; // or you can replace **'this'** with your **ActivityName.this**
try {
Intent i = ctx.getPackageManager().getLaunchIntentForPackage("com.whatsapp");
ctx.startActivity(i);
} catch (NameNotFoundException e) {
    // TODO Auto-generated catch block
}

answered Mar 27 '16 at 06:24

Adnan Amjad

2,483
1
19
29

thanks it works. But in my case, the application has to be chosen from the spinner . So I have used String to strore the package name – luna Mar 27 '16 at 07:24

score 1 · Answer 3 · answered Mar 27 '16 at 06:24

1

If so then make it final

final String app="com.whatsapp";

OR

Declare it as global variable of class like

public class MyClass {

String app="com.whatsapp";

//Other methods
}

answered Mar 27 '16 at 06:24

Shree Krishna

8,273
6
36
67

how to launch an app from another app in android

3 Answers3

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