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;

	@Override
	public 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()
		{
			@Override
			public 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);
			}
	}

	@Override
	public 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
{
	@Override
	protected 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()
	{
		@Override
		public void onServiceConnected(ComponentName name, IBinder service)
		{
			// get Binder
		}

		@Override
		public void onServiceDisconnected(ComponentName name)
		{

		}
	};

	// 解绑服务
	protected void onDestroy()
	{
		super.onDestroy();
		unbindService(connServiceConnection);
	};
}