Android 一键屏锁的实现

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        registerReceiver();
        devicePolicyManager =(DevicePolicyManager)getSystemService(DEVICE_POLICY_SERVICE);
        //若未注册设备管理器，跳转到配置界面
        //若已注册设备管理器，显示取消设备管理器页面
        if(devicePolicyManager.isAdminActive(new ComponentName(this, DeviceMangerBroadCast.class))){
            devicePolicyManager.lockNow();
            finish();
        }else{
            Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, new ComponentName(this, DeviceMangerBroadCast.class));
            startActivityForResult(intent, 1);
        }
    }

 public void registerReceiver(){
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.app.action.DEVICE_ADMIN_ENABLED");
        intentFilter.addAction("android.app.action.DEVICE_ADMIN_DISABLED");
        registerReceiver(deviceMangerBroadCast,intentFilter);
    }
 
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(deviceMangerBroadCast);
    }

public class DeviceMangerBroadCast extends DeviceAdminReceiver {
    @Override
    public void onEnabled(Context context, Intent intent) {
        super.onEnabled(context, intent);
        Toast.makeText(context, "已获取设备管理者权限", Toast.LENGTH_SHORT).show();
    }
 
    @Override
    public void onDisabled(Context context, Intent intent) {
        super.onDisabled(context, intent);
        Toast.makeText(context, "已取消设备管理者权限", Toast.LENGTH_SHORT).show();
    }
}

    <receiver android:name=".DeviceMangerBroadCast"
            android:exported="true" android:permission="android.permission.BIND_DEVICE_ADMIN" > 很关键
 
            <meta-data
                android:name="android.app.device_admin"
                android:resource="@xml/device_admin" />
 
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
                <action android:name="android.app.action.DEVICE_ADMIN_DISABLED" />
            </intent-filter>
 
        </receiver>
 
        <activity android:name=".MainActivity" android:exported="true" android:enabled="true" android:theme="@style/TransparentTheme">
            <intent-filter>
                <category android:name="android.intent.category.LAUNCHER"/>
                <action android:name="android.intent.action.MAIN"/>
            </intent-filter>
        </activity>

<?xml version="1.0" encoding="UTF-8"?>   
<device-admin  
  xmlns:android="http://schemas.android.com/apk/res/android">  
    <uses-policies>  
        <!-- 强行锁定  在里仅这个是需要的-->  
        <force-lock />  
        <!-- 清除所有数据（恢复出厂设置） -->  
        <wipe-data />  
         <!-- 重置密码 -->  
        <reset-password />  
        <!-- 限制密码选择 -->  
         <limit-password />  
         <!-- 监控登录尝试 -->  
          <watch-login />  
    </uses-policies>  
</device-admin>