自定义锁屏界面,锁定系统,禁止返回和home键关闭界面

本文提供一个实现将自定义的界面显示在系统最顶层,达到锁定系统,禁止返回和home键关闭界面的解决方案。
在手机黑屏状态,也能够弹出解锁界面

1添加权限

<!-- 系统窗口，显示在最顶层 --> < uses-permission android:name= "android.permission.SYSTEM_ALERT_WINDOW" />

2创建界面布局文件lock_screen.xml

<LinearLayout 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:background="#000000"    android:orientation="vertical" >    <TextView        android:layout_width="match_parent"              android:layout_height="wrap_content"        android:textColor="#ffffff"        android:gravity="center"        android:text="屏幕已锁定" />    <Button        android:id="@+id/btn"        android:layout_marginTop="250dp"        android:textColor="#ffffff"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="关闭界面" /></LinearLayout>

3创建服务AppService

Don't go for activity, because android will not show lock screen behind your activity for security reason, so use service instead of Activity.

不要在activity中显示，由于安全原因，安卓系统不会在锁屏时候显示自定义的窗口，所以使用服务代替activity

WindowManager 这个类能够实现系统级别的窗口。

首先设置布局界面的属性

关键是设置TYPE_SYSTEM_ERROR

</pre><pre name="code" class="java">wm = (WindowManager) getSystemService(WINDOW_SERVICE);// 设置lockScreenView视图的属性// 属性TYPE_SYSTEM_ERROR:出现在任何界面的前面mLayoutParams = new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT,0, 0, WindowManager.LayoutParams.TYPE_SYSTEM_ERROR, WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED| WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, PixelFormat.RGBA_8888);LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

AppService.java完整代码

/* *@author Dawin,2015-2-4 * */package com.example.superlockscreen;import com.example.superlockscreen.R;import android.app.Service;import android.content.Context;import android.content.Intent;import android.graphics.PixelFormat;import android.os.IBinder;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.Button;/** * 实现界面锁定。禁止手机的任何按键操作 * @author Dawin * *Don't go for activity,  *because android will not show lock screen behind your activity for security reason,  *so use service instead of Activity. */public class AppService extends Service{private WindowManager.LayoutParams mLayoutParams;private WindowManager wm;private View lockScreenView;private Button btn;@Overridepublic void onCreate(){super.onCreate();wm = (WindowManager) getSystemService(WINDOW_SERVICE);// 设置lockScreenView视图的属性// 属性TYPE_SYSTEM_ERROR:出现在任何界面的前面mLayoutParams = new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT,0, 0, WindowManager.LayoutParams.TYPE_SYSTEM_ERROR, WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED| WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, PixelFormat.RGBA_8888);LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);//绑定自定义界面lockScreenView = mInflater.inflate(R.layout.lock_screen, null);//获取界面的按钮btn = (Button) lockScreenView.findViewById(R.id.btn);btn.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v){// 关闭锁屏界面removeViewFromWindow();}});wm.addView(lockScreenView, mLayoutParams);};/** 关闭锁屏界面 */public void removeViewFromWindow(){if (lockScreenView != null){wm.removeView(lockScreenView);}}@Overridepublic IBinder onBind(Intent intent){return null;}}

4最后在Activity中绑定服务

package com.example.superlockscreen;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;public class MainActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);// 绑定服务Intent service = new Intent(this, AppService.class);bindService(service, connServiceConnection, BIND_AUTO_CREATE);}private ServiceConnection connServiceConnection = new ServiceConnection(){@Overridepublic void onServiceConnected(ComponentName name, IBinder service){// get Binder}@Overridepublic void onServiceDisconnected(ComponentName name){}};// 解绑服务protected void onDestroy(){super.onDestroy();unbindService(connServiceConnection);};}