我试图覆盖一个TextView在LockScreen顶部(类似于Android Overlays的时间).
注意：我不想旁路锁屏,但只是画在它的顶部(不干扰任何触摸事件).
我试过使用以下标志(在onCreate中)：
getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH);
getWindow().addFlags(PixelFormat.TRANSLUCENT);
并应用以下主题(到具体活动)：
<style name="Transparent">
<item name="android:windowNoTitle">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowActionBar">false</item>
<item name="android:backgroundDimEnabled">false</item>
<item name="android:windowIsFloating">true</item>
</style>
但是,这将吸引锁定屏幕的顶部,隐藏锁定屏幕并禁用所有触摸事件.
编辑：activity_overlay.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.coco.MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/white"
android:layout_alignParentBottom="true"
android:text="TextView" />
</RelativeLayout>
活动清单声明(其膨胀overlay_activity.xml)
<activity
android:name=".DisplayActivity"
android:label="@string/app_name"
android:theme="@style/Transparent" />
解决方法
由于您希望从应用程序活动中显示内容,您可以使用Service和WindowManager,与Facebook Messenger和其他浮动Windows应用程序的工作方式相同;)
LockScreenTextService.class
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.PixelFormat;
import android.os.IBinder;
import android.support.v4.content.ContextCompat;
import android.view.Gravity;
import android.view.WindowManager;
import android.widget.TextView;
/**
* Created on 2/20/2016.
*/
public class LockScreenTextService extends Service {
private BroadcastReceiver mReceiver;
private boolean isShowing = false;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
private WindowManager windowManager;
private TextView textview;
WindowManager.LayoutParams params;
@Override
public void onCreate() {
super.onCreate();
windowManager = (WindowManager)getSystemService(WINDOW_SERVICE);
//add textview and its properties
textview = new TextView(this);
textview.setText("Hello There!");
textview.setTextColor(ContextCompat.getColor(this,android.R.color.white));
textview.setTextSize(32f);
//set parameters for the textview
params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
| WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
| WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,PixelFormat.TRANSLUCENT);
params.gravity = Gravity.BOTTOM;
//Register receiver for determining screen off and if user is present
mReceiver = new LockScreenStateReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
registerReceiver(mReceiver,filter);
}
@Override
public int onStartCommand(Intent intent,int flags,int startId) {
return START_STICKY;
}
public class LockScreenStateReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context,Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
//if screen is turn off show the textview
if (!isShowing) {
windowManager.addView(textview,params);
isShowing = true;
}
}
else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {
//Handle resuming events if user is present/screen is unlocked remove the textview immediately
if (isShowing) {
windowManager.removeViewImmediate(textview);
isShowing = false;
}
}
}
}
@Override
public void onDestroy() {
//unregister receiver when the service is destroy
if (mReceiver != null) {
unregisterReceiver(mReceiver);
}
//remove view if it is showing and the service is destroy
if (isShowing) {
windowManager.removeViewImmediate(textview);
isShowing = false;
}
super.onDestroy();
}
}
并在AndroidManifest.xml上添加必要的权限并添加该服务
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.textonlockscreenusingservice">
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/> //this
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".LockScreenTextService" /> //this
</application>
</manifest>
不要忘了在您的活动onCreate()上启动服务
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(this,LockScreenTextService.class);
startService(intent);
}
TextView显示在锁屏上
解锁时删除TextView
