Android：DeviceAdmin应用程序：无法启动活动来添加设备管理员

Question

我正在关注Device Admin应用程序的示例代码。我尝试启动允许用户添加设备管理员应用的活动失败。以下是我用来尝试和开始的代码。

public class DeviceAdminTestActivity extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     ComponentName deviceAdminReceiver = new ComponentName(this, TestAdminReceiver.class); 
     Intent i = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN); 
     i.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, deviceAdminReceiver); 
     i.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "My Explanantion"); 

//  startActivityForResult(i, 1); 
     try{ 
      startActivity(i); 
     }catch(Exception ex){ 
      Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG); 
     } 
    } 
} 

以下为接收器的代码...

public class TestAdminReceiver extends DeviceAdminReceiver { 
    @Override 
    public void onEnabled(Context context, Intent intent) { 
     Toast.makeText(context, "On Enabled", Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public CharSequence onDisableRequested(Context context, Intent intent) { 
     return ("You are about to disable device admin"); 
    } 

    @Override 
    public void onDisabled(Context context, Intent intent) { 
     Toast.makeText(context, "On Disabled", Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onPasswordChanged(Context context, Intent intent) { 
     Toast.makeText(context, "On Password Changed", Toast.LENGTH_SHORT).show(); 
    } 
} 

最后，这里是清单......

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="org.zeezulander.admintest" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk android:minSdkVersion="8" /> 

    <application 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" > 
     <activity 
      android:name="org.zeezulander.admintest.DeviceAdminTestActivity" 
      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=".TestAdminReceiver" android:permission="android.permission.BIND_DEVICE_ADMIN" android:label="Test Admin">   
      <meta-data android:resource="@xml/admin_data" android:name="adminMetaData"/> 
      <intent-filter > 
       <action android:name="android.app.action.DEVICE_ADMIN_ENABLED"/> 
      </intent-filter> 
     </receiver> 
    </application> 

我没有得到一个错误，甚至。我的活动开始了，但没有什么会发生，甚至没有错误。

Answer 1

布局可能有问题。如果你没有收到错误，那么它不会崩溃，如果它没有崩溃，那么唯一可能出错的是显示（布局）。

Answer 2

final Intent intent = new Intent(); 
     intent.setComponent(new ComponentName("com.android.settings", "com.android.settings.DeviceAdminAdd")); 
     intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, adminReceiver); 
     intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "To use all features activate it."); 
     overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); 
     startActivityForResult(intent, ACTIVATION_REQUEST);