How To Launch An App From Another App In Android

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); Strin

Solution 1:

Use the Following Function

publicvoidstartNewActivity(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 = newIntent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setData(Uri.parse("market://details?id=" + packageName));
        context.startActivity(intent);
    }
}

Solution 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 {
Intenti= ctx.getPackageManager().getLaunchIntentForPackage("com.whatsapp");
ctx.startActivity(i);
} catch (NameNotFoundException e) {
    // TODO Auto-generated catch block
}

Solution 3:

If so then make it final

finalString app="com.whatsapp";

OR

Declare it as global variable of class like

publicclassMyClass{

String app="com.whatsapp";

//Other methods
}