Android - 当 phone 被锁定时显示来自服务的警告对话框

Android -showing alert dialog from service when phone is locked

我的问题是在服务的锁定屏幕上显示警告对话框。当 phone 处于解锁状态时,它显示得很好。实际上,如果 phone 是 lock ,它只会解锁 phone 并且在锁定后会出现警告对话框。这是我的代码:

Service.java:

public static void popupDialog(String sender , String msg)
{
    final String senderName = sender;
    final String message = msg;
    Handler h = new Handler(context.getMainLooper());
    h.post(new Runnable() {
        @Override
        public void run() {
            KeyguardManager km = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);

            if (km.inKeyguardRestrictedInputMode())
            {
                lockFlag = true;
                Log.d ("---popup","lock");
                powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
                km = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
                mKeyguardLock = km.newKeyguardLock("com.example.myapplication");
                mKeyguardLock.disableKeyguard();
                wl = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, "com.example.myapplication");
                wl.acquire();
            }
            else
            {
                Log.d ("---popup","unlock");
            }
            final View view = View.inflate(context.getApplicationContext(),R.layout.popup, null);
            final AlertDialog.Builder builder1 = new AlertDialog.Builder(context)
                .setCancelable(true)
                .setView(view);
            final ImageView ImageView1 = (ImageView) view.findViewById(R.id.ImageView1);
            final TextView TextView1 = (TextView) view.findViewById(R.id.TextView1);
            final TextView TextViewSender = (TextView) view.findViewById(R.id.TextViewSender);
            TextViewSender.setText (senderName+":");
            final TextView TextView2 = (TextView) view.findViewById(R.id.TextView2);
            TextView2.setText (message);
            final EditText EditText1 = (EditText) view.findViewById(R.id.EditText1);

            final ImageButton ImageButton1 = (ImageButton) view.findViewById(R.id.ImageButton1);
            ImageButton1.setOnClickListener( new OnClickListener() {
                @Override
                public void onClick(View v) {
                /*do some task*/
                    }
                }
            });
            AlertDialog alertDialog = builder1.create();
            alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
            alertDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
            alertDialog.show();
        }
    });
}

我只想在锁定时显示警报对话框。

已编辑: 我使用 Android Lolipop,阅读 this link 后,我使用 TYPE_SYSTEM_OVERLAY 而不是 TYPE_SYSTEM_ALERT。在这种情况下,我无法在 EditText 上键入内容,甚至无法关闭对话框。

将类型更改为 TYPE_SYSTEM_ERROR

改变

alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);

alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR);

更新:

TYPE_SYSTEM_ALERT - Window类型:系统window,比如低电量提示。这些 windows 始终位于应用程序 windows 之上。在多用户系统中,仅在拥有用户的 window 上显示。 常数值:2003 (0x000007d3)

TYPE_SYSTEM_ERROR - Window类型:内部系统错误windows,尽其所能出现。在多用户系统中,仅在拥有用户的 window 上显示。 常数值:2010 (0x000007da)

更多信息是here