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);??? ???
??? ??}??? ??