android_一键锁屏

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1.在android4.2上正常工作，参考网络代码。

2.文件：MainActivity.java

package com.xhcbird.lock;import android.os.Bundle;import android.app.Activity;import android.app.admin.DevicePolicyManager;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.util.Log;import android.view.Menu;public class MainActivity extends Activity {private DevicePolicyManager mDevicePolicyManager;private ComponentName mComponentName;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// setContentView(R.layout.activity_main);//传说中的Log.iLog.i("--->lock!!", "start lock");mDevicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);mComponentName = new ComponentName(this, LockReceiver.class);// 判断是否有权限if (mDevicePolicyManager.isAdminActive(mComponentName)) {mDevicePolicyManager.lockNow();// 下面两行都不好使，在android4.2上// android.os.Process.killProcess(android.os.Process.myPid());// System.exit(0);finish();} else {activeManager();}}private void activeManager() {// 激活设备管理器获取权限Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mComponentName);intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "传说中的一键锁屏");startActivity(intent);finish();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

3.文件：LockReceiver.java

package com.xhcbird.lock;import android.app.admin.DeviceAdminReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class LockReceiver extends DeviceAdminReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Log.i("--->DeviceAdminReceiver !!", "接收");super.onReceive(context, intent);}@Overridepublic void onEnabled(Context context, Intent intent) {Log.i("--->DeviceAdminReceiver !!", "激活");super.onEnabled(context, intent);}@Overridepublic void onDisabled(Context context, Intent intent) {Log.i("--->DeviceAdminReceiver !!", "取消");super.onDisabled(context, intent);}}

4.文件：AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.xhcbird.lock"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@android:style/Theme.NoDisplay" >        <activity            android:name="com.xhcbird.lock.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <!-- 设备管理 -->        <receiver android:name=".LockReceiver"                  android:label="@string/app_name"                  android:description="@string/app_name"                  android:permission="android.permission.BIND_DEVICE_ADMIN">                <meta-data android:name="android.app.device_admin"                           android:resource="@xml/lock_screen" />                   <intent-filter>                        <action                           android:name="android.app.action.DEVICE_ADMIN_ENABLED" />                   </intent-filter>        </receiver>    </application></manifest>

除了设备管理权限外，注意：

android:theme="@android:style/Theme.NoDisplay"

创建没有任何显示的apk

5.取消设备管理权限：设置->安全->设备管理器->你应该会了...

6.代码下载地址：http://download.csdn.net/detail/u013025459/6964457

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