Android 设备管理员权限活动未启动

Question

我正在尝试以设备管理员身份启用我的应用程序。尝试调用向我的应用授予设备管理员权限的活动的代码（位于我应用的第一个活动中）如下所示：

import android.app.Activity;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.common.GooglePlayServicesUtil;
public class RegisterActivity extends Activity {
    // alert dialog manager
    AlertDialogManager alert = new AlertDialogManager();
    // Internet detector
    ConnectionDetector cd;
    // UI elements
    EditText txtName;
    EditText txtEmail;
    // Register button
    Button btnRegister;
    static final int ACTIVATION_REQUEST = 47; //Request ID for Device Administrator
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        //Unrelated 
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if (status != 0) {
            Toast.makeText(this, "This device is not supported - please download Google Play Services.", 
                      Toast.LENGTH_LONG).show();
        }
        //Begin enabling device administrator 
        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
        ComponentName deviceAdminComponentName = new ComponentName(this, DeviceAdmin.class);
        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, deviceAdminComponentName);  
        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "You must enable device administration for certain features"
                + " of the app to function.");  
        //I thought that this would start the activity that lets the user
        //choose whether to enable the app as a device admin
        startActivityForResult(intent, ACTIVATION_REQUEST);

        //Also contains code pertaining to unrelated Google Cloud messaging features
        //and an onClick() method, all inside of onCreate()

        }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case ACTIVATION_REQUEST:
            if (resultCode == Activity.RESULT_OK) {
                Log.i("DeviceAdminSample", "Administration enabled!");
            } 
            else {
                Log.i("DeviceAdminSample", "Administration enable FAILED!");
            }
            return;
    }
    super.onActivityResult(requestCode, resultCode, data);
}

使用此代码，当我运行应用程序时，活动出现，然后具有看起来像正在打开新活动的动画，但随后该动画停止并保留在当前活动上，而不会提示用户启用设备管理员。与设备管理员相关的日志消息均未命中。 但是，在"设置->安全->设备管理员"页面上查看当前设备管理员时，会显示我的应用，但未选中它作为设备管理员。

这是我的 DeviceAdmin 子类的代码，尽管我看不出问题可能来自此代码中的位置：

import android.app.admin.DeviceAdminReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class DeviceAdmin extends DeviceAdminReceiver {
    @Override
    public void onEnabled(Context context, Intent intent) {
        super.onEnabled(context, intent);
        Log.i("Device Admin: ", "Enabled");
    }
    @Override
    public String onDisableRequested(Context context, Intent intent) {
        return "Admin disable requested";
    }
    @Override
    public void onDisabled(Context context, Intent intent) {
        super.onDisabled(context, intent);
        Log.i("Device Admin: ", "Disabled");
    }
    @Override
    public void onPasswordChanged(Context context, Intent intent) {
        super.onPasswordChanged(context, intent);
        Log.i("Device Admin: ", "Password changed");
    }
}

任何帮助将不胜感激！

更新：我的Android清单中的设备管理员接收器如下：

    <!-- Device Administration Receiver -->
    <receiver
        android:name="com.myPackage.DeviceAdminReceiver"
        android:permission="android.permission.BIND_DEVICE_ADMIN">
        <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.ACTION_DEVICE_ADMIN_DISABLE_REQUESTED" />
            <action android:name="android.app.action.ACTION_DEVICE_ADMIN_DISABLED" />
        </intent-filter>           
    </receiver>        

Answer 1

我猜你忘了在清单中添加带有正确意图过滤器的接收器

<receiver
        android:name="com.yourpackage.DeviceAdmin"
        android:permission="android.permission.BIND_DEVICE_ADMIN" >
        <intent-filter>
            This action is required
            <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
        </intent-filter>
        This is required this receiver to become device admin component.
        <meta-data
            android:name="android.app.device_admin"
            android:resource="@xml/device_admin" />
    </receiver>

而XMl

<device-admin xmlns:android="http://schemas.android.com/apk/res/android" >
<uses-policies>
    <limit-password />
    <watch-login />
    <reset-password />
    <force-lock />
    <wipe-data />
    <expire-password />
    <encrypted-storage />
    <disable-camera />
</uses-policies>
</device-admin>

有关设备管理的详细信息。检查这个

Answer 2

我在Jagadesh的帮助下发现了问题。

在我的Android清单文件中，我将接收器名称设置为DeviceAdminReceiver，如下所示

<receiver
    android:name="com.myPackage.DeviceAdminReceiver"
    android:permission="android.permission.BIND_DEVICE_ADMIN">

我错了，因为接收器应该带有类DeviceAdminReceiver的名称，而不是我编写的扩展DeviceAdminReceiver，DeviceAdmin

清单文件中更新的工作接收器是：

    <!-- Device Administration Receiver -->
    <receiver
        android:name="com.myPackage.DeviceAdmin"
        android:permission="android.permission.BIND_DEVICE_ADMIN">
        <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.ACTION_DEVICE_ADMIN_DISABLE_REQUESTED" />
            <action android:name="android.app.action.ACTION_DEVICE_ADMIN_DISABLED" />
        </intent-filter>           
    </receiver>        

Answer 3

我遇到了同样的问题，并通过在清单中删除来纠正它：

android:launchMode="singleInstance"