在接收消息广播的onReceive里，跳转到你要显示的界面。如：

1. Intent intent = new Intent(arg0,MainActivity.class);
2. intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        
3. arg0.startActivity(intent);

在该activity的onCreate()方法里：

1. super.onCreate(savedInstanceState);
2. getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
3. setContentView(R.layout.activity_main);

设置activity的theme属性：

1. android:theme="@android:style/Theme.Wallpaper.NoTitleBar"

添加点击事件，进入app，突破锁屏：

1. KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
2. KeyguardLock keyguardLock = keyguardManager.newKeyguardLock("");
3. keyguardLock.disableKeyguard();

在menifest中加入该权限：

1. <uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>