一键锁屏

源码片段

public class MainActivity extends Activity {

 

    private DevicePolicyManager policyManager;

 

    private ComponentName componentName;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

         

        policyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);

        componentName = new ComponentName(this, LockReceiver.class);

 

        if (policyManager.isAdminActive(componentName)) {   //判断是否有权限(激活了设备管理器)

            policyManager.lockNow();// 直接锁屏

            finish();

        }else{

            activeManager();//激活设备管理器获取权限

            finish();

        }

    }

     

    private void activeManager() {

        //使用隐式意图调用系统方法来激活指定的设备管理器

        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);

        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "一键锁屏");

        startActivity(intent);

    }

}