How do I programmatically launch a specific application?

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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.twidroid.SendTweet");
ctx.startActivity(i);
} catch (NameNotFoundException e) {
    // TODO Auto-generated catch block
}

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