锁屏与DevicePolicyManager

我知道它不是第一次这个问题是问，但我无法找到我的问题的任何解决方案。

I know its not the first time this question is asked, but i couldnt find any solution for my problem.

下面是一些code为你们：

Here is some code for you guys:

MainActivity.class：

MainActivity.class:

package com.fromscratch.aside;


import android.app.admin.DeviceAdminReceiver;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends ActionBarActivity implements View.OnClickListener {

DevicePolicyManager mDPM;
ComponentName mAdminName;
protected static final int REQUEST_ENABLE = 0;
private Button bLockButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mAdminName = new ComponentName(MainActivity.this,MyAdmin.class);
    mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
    bLockButton = (Button)findViewById(R.id.lock_button);
    bLockButton.setOnClickListener(this);
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(REQUEST_ENABLE == requestCode){
        System.out.println(mDPM.isAdminActive(mAdminName));
            super.onActivityResult(requestCode,resultCode,data);
    }
}

@Override
public void onClick(View v) {
    switch(v.getId()){
        case (R.id.lock_button):
            lockButtonClicked();
    }
}

private void lockButtonClicked(){
    if(!mDPM.isAdminActive(mAdminName)){

        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,mAdminName);
        startActivityForResult(intent,REQUEST_ENABLE);
    }
    else{
        mDPM.lockNow();
    }
}

public class MyAdmin extends DeviceAdminReceiver{

}
}

AndroidManifest.xml中

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.fromscratch.aside" >
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        <activity
            android:name=".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>
        <receiver
            android:name=".MainActivity$MyAdmin"
            android:permission="android.permission.BIND_DEVICE_ADMIN">
            <meta-data
                android:name="android.app.aSide"
                android:resource="@xml/my_admin"/>
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED"/>
            </intent-filter>
        </receiver>
    </application>

</manifest>

my_admin.xml：

my_admin.xml:

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

阅读和阅读小时后，我没有什么线索是不对的code。
但我认为主要的问题是，我不明白的接受管理权限对话框当我在我的应用程序点击锁定按钮。

After reading and reading for hours, i dont have a clue what is wrong with this code. But i think the main Problem is that i dont get the "accept admin permission dialog" when i click the lock button in my application.

我厌倦了这家店也是能够锁定屏幕（塔斯克）antoher应用程序，以确保它与我的设备（GALAXY NOTE 4）没有问题。
- >它的工作（管理员权限对话框出现 - >确定 - >屏幕锁定）

I tired antoher app from the store which is also able to lock the screen (tasker), to make sure that it is no problem with my device (galaxy note 4). --> It worked (Admin permission dialog comes up --> Ok --> screen is locked)

因此​​，也许你们有任何想法IAM在这里失踪。

So maybe you guys have any ideas what iam missing here.

在此先感谢