如何从另一个应用程序启动活动？

Question

I dont know what I am doing wrong. I am trying to launch an activity of another app from current app.
Here is the code:

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

    Intent intent = new Intent(Intent.ACTION_MAIN); 
    intent.setComponent(new ComponentName("com.second.package","com.second.package.SecondActivity")); 
    startActivity(intent); 

}

When I run this thing it says Application closed unexpectedly. What is wrong? Please help me.

Succeded: Just add :

android.intent.category.DEFAULT

to the activity in the manifest file.

Answer 1

try as:

Intent intent = new Intent("android.intent.action.MAIN"); 
intent.setComponent(new   
ComponentName("com.second.package","com.second.package.SecondActivity")); 
intent.addCategory("android.intent.category.LAUNCHER");
intent.setFlags(Intent.FLAG_FROM_BACKGROUND);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);