Question

我想显示警报对话框，但它目前正处于应用程序界面。这是一种方法吗？

Intent i = new Intent("com.example.servicealarmdemo2.demoactivity");
PendingIntent operation = PendingIntent.getActivity(
                          getBaseContext(), 0, i, Intent.FLAG_ACTIVITY_NEW_TASK);

我是否必须更改PendingIntent变量？

答案：

我终于找到了最简单的方法。刚刚在MainActivity类中添加了命令“finish（）”以完成活动并返回主屏幕，然后可以在那里显示警报。

希望它会帮助其他陷入此问题的人

Answer 1

如果您想在主屏幕中创建应用，请参阅以下链接

this和this

但是，如果您希望自己的代码正常运行，即使您的手机也使用KeyguardLock和WakeLock。以下是我的工作：

   public class DismissLock extends Activity {

   PowerManager pm;
   WakeLock wl;
   KeyguardManager km;
   KeyguardLock kl;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       // TODO Auto-generated method stub
      super.onCreate(savedInstanceState);
      Log.i("INFO", "onCreate() in DismissLock");
      pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
       km=(KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
      kl=km.newKeyguardLock("INFO");
      wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.ON_AFTER_RELEASE, "INFO");
      wl.acquire(); //wake up the screen
      kl.disableKeyguard();// dismiss the keyguard

     setContentView(R.layout.main);

    }

 @Override
 protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    wl.release(); //when the activiy pauses, we should realse the wakelock
}

 @Override
 protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    wl.acquire();//must call this!
}
}

当然，您仍需要在清单文件中声明权限。

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

//// EDIT

如果您想加入两项工作，您必须使用以下代码编辑代码：

   boolean fDialogMode     = getIntent().hasExtra( "dialog_mode" );

      if( ! fDialogMode ) {
          super.setTheme( android.R.style.Theme_Dialog );
      }

   AlertDemo alert = new AlertDemo();
   pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
   km=(KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
   kl=km.newKeyguardLock("INFO");
   wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.ON_AFTER_RELEASE, "INFO");
   wl.acquire(); //wake up the screen                  
   kl.disableKeyguard();// dismiss the keyguard
/** Opening the Alert Dialog Window */
alert.show(getSupportFragmentManager(), "AlertDemo");

并在另一个包或接收器中添加以下代码：

        Intent i;
    PackageManager manager = getPackageManager();
    try {
        i = manager.getLaunchIntentForPackage("com.example.openlock");
        if (i == null)
            throw new PackageManager.NameNotFoundException();
        i.addCategory(Intent.CATEGORY_LAUNCHER);

        startActivity(i);
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }

Answer 2

使用服务

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.getApplicationContext().startActivity(intent);

下面是一些代码

public class HomepopupDataService extends Service {

    private static final String TAG = "HomepopupDataService";

    @Override
    public void onCreate() {
        Log.i(TAG, "Service onCreate");
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        Log.i(TAG, "Service onStartCommand");

        CountDownTimer dlgCountDown;
        Log.e("---------------", "onHandleIntent");
        dlgCountDown = new CountDownTimer(10000, 1000) {
            public void onTick(long millisUntilFinished) {
                Log.e("---------------", "onHandleIntent++");
            }

            public void onFinish() {
                Intent i = new Intent(getApplicationContext(),
                        DialogActivity.class);

                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                getApplicationContext().startActivity(i);
            }
        }.start();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        Log.i(TAG, "Service onBind");
        return null;
    }

    @Override
    public void onDestroy() {
        Log.i(TAG, "Service onDestroy");
    }

}

在主屏幕中显示警报对话框

2 个答案: