启动另一个应用

//       Intent intent = new Intent(Intent.ACTION_MAIN);
//       intent.addCategory(Intent.CATEGORY_LAUNCHER);           
//       ComponentName cn = new ComponentName("com.cn.livall.activity", "com.cn.livall.activity.LoginActivity");           
//       intent.setComponent(cn);
//       startActivity(intent);

       Intent intent=new Intent();
       intent.setClassName("com.estrongs.android.pop", "com.estrongs.android.pop.view.FileExplorerActivity");
       startActivity(intent);       
      }