Question

我想编写一个小应用程序，以便在启动时开始计数100秒，然后模拟单击电源按钮。使设备进入睡眠状态。如何使用C＃Xamarin模拟Android中的电源按钮单击？感谢前进

Answer 1

根据您的描述，您想要锁定屏幕，使用设备管理器DevicePolicyManager锁定屏幕，然后使用PowerManager显示屏幕。

继承DeviceAdminReceiver

public class ScreenOffAdminReceiver: DeviceAdminReceiver
{
private void showToast(Context context,string msg)
{
    Toast.MakeText(context, msg, ToastLength.Short).Show();

}
public override void OnEnabled(Context context, Intent intent)
{
    base.OnEnabled(context, intent);
    showToast(context, "Device Manager enable");

}

public override void OnDisabled(Context context, Intent intent)
{
    base.OnDisabled(context, intent);
    showToast(context, "Device Manager is not enabled");

}

}

PowerManager和DevicePolicyManager

private DevicePolicyManager policyManager;
private ComponentName adminReceiver;
private PowerManager mPowerManager;
private PowerManager.WakeLock mWakeLock;


protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    // Set our view from the "main" layout resource
    SetContentView(Resource.Layout.activity_main);



    adminReceiver= new ComponentName(this, Java.Lang.Class.FromType(typeof(ScreenOffAdminReceiver)).Name);
    policyManager = (DevicePolicyManager)GetSystemService(Context.DevicePolicyService);

    mPowerManager = (PowerManager)GetSystemService(Context.PowerService);
}

检查屏幕状态

  private void BtncheckAndTurnOnDeviceManager_Click(object sender, System.EventArgs e)
     {
    Intent intent = new Intent(DevicePolicyManager.ActionAddDeviceAdmin);
    intent.PutExtra(DevicePolicyManager.ExtraDeviceAdmin, adminReceiver);
    intent.PutExtra(DevicePolicyManager.ExtraAddExplanation, "After you turn it on, you can use the lock screen function....");
    StartActivityForResult(intent, 0);

}

private void Btncheckscreenoff_Click(object sender, System.EventArgs e)
{
    bool admin = policyManager.IsAdminActive(adminReceiver);
    if (admin)
    {
        policyManager.LockNow();
    }
    else
    {
        showToast("No device management permissions");
    }

}

private void Btncheckscreenon_Click(object sender, System.EventArgs e)
{
    mWakeLock = mPowerManager.NewWakeLock(WakeLockFlags.Partial, "tag");
    mWakeLock.Acquire();
    mWakeLock.Release();

}

private void Btncheckscreen_Click(object sender, System.EventArgs e)
{
    PowerManager pm = (PowerManager)GetSystemService(Context.PowerService);
    bool screenOn = pm.IsScreenOn;
    if (!screenOn)
    {
        showToast("The screen is a black screen");
    }
    else
    {
        showToast("The screen is bright");

    }

}

请在mainifest.xml中确认权限：

<uses-permission android:name="android.permission.DEVICE_POWER" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

如何使用C＃Xamarin模拟Android中的电源按钮？

1 个答案: