你好，我想表现出一个系统重新启动广播接收机中的后一个警告对话框。我已经添加了接收器在我的清单，并要求所需的权限，但我得到一个错误显示的对话框。请我如何正确地实现这一点？..谢谢

我的code：

 公共无效的onReceive（最终上下文的背景下，意图意图）{
    Log.d（TAG，收到启动完成广播接收器...开始设置）;


    。字符串设置= context.getResources（）的getString（R.string.restart_setting）;
        String是= context.getResources（）的getString（R.string.Settings）。
        字符串否= context.getResources（）的getString（R.string.Cancel）。

              最后AlertDialog.Builder建设者=新AlertDialog.Builder（上下文）;
                builder.setMessage（设置）
                       .setCancelable（假）
                       .setPositiveButton（是的，新DialogInterface.OnClickListener（）{
    公共无效的onClick（@燮pressWarnings（未使用）最终DialogInterface对话框，@燮pressWarnings（未使用）最终诠释ID）
   配置意图=新的意图（背景下，WeatherConfigure.class）
     context.startActivity（配置）;

    }
 }）
    .setNegativeButton（不，新DialogInterface.OnClickListener（）{
        公共无效的onClick（最终DialogInterface对话框，@燮pressWarnings（未使用）最终诠释ID）{
             dialog.cancel（）;
        }
    }）;
  最后AlertDialog警报= builder.create（）;
  alert.show（）;

    }
 

我得到这个日志错误：

 一月一日至七日：42：01.559：ERROR / AndroidRuntime（2004年）：android.view.WindowManager $ BadTokenException：产生的原因无法添加窗口 - 令牌null不是一个应用程序

1月1号至7日：42：01.559：ERROR / AndroidRuntime（2004年）：在android.view.ViewRoot.setView（ViewRoot.java:548）

1月1号至7日：42：01.559：ERROR / AndroidRuntime（2004年）：在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:177）

1月1号至7日：42：01.559：ERROR / AndroidRuntime（2004年）：在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:91）

1月1号至7日：42：01.559：ERROR / AndroidRuntime（2004年）：在android.app.Dialog.show（Dialog.java:288）

1月1号至7日：42：01.559：ERROR / AndroidRuntime（2004年）：在com.MuaaApps.MyWeatherUpdate.myWeatherBroadcastReceiver.onReceive(MyWeatherBroadcastReceiver.java:59)

1月1号至7日：42：01.559：ERROR / AndroidRuntime（2004）：在android.app.ActivityThread.handleReceiver（ActivityThread.java:1994）
 

解决方案

现在的问题是，你正在试图表明一个 AlertDialog 从的BroadcastReceiver ，这是不允许的。你不能表现出 AlertDialog 从的BroadcastReceiver 。只有活动可以显示的对话框。

您应该做些别的事情，有的BroadcastReceiver 启动时自动打开为你做的，开始活动，以显示该对话框。

下面是一个博客文章更多相关信息。

编辑：

下面是我会建议这样做。从你的的BroadcastReceiver 启动活动与 AlertDialog 这样..

 公共类NotifySMSReceived扩展活动
{
    私有静态最后弦乐LOG_TAG =SMSReceiver;
    公共静态最终诠释NOTIFICATION_ID_RECEIVED = 0x1221;
    静态最后弦乐ACTION =android.provider.Telephony.SMS_RECEIVED;

    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;

        IntentFilter的过滤器=新的IntentFilter（ACTION）;
        this.registerReceiver（mReceivedSMSReceiver，过滤器）;
    }

    私人无效displayAlert（）
    {
        AlertDialog.Builder建设者=新AlertDialog.Builder（本）;
        builder.setMessage（你确定要退出吗？）。setCancelable（
            假）.setPositiveButton（是，
            新DialogInterface.OnClickListener（）{
                公共无效的onClick（DialogInterface对话框，INT ID）{
                    dialog.cancel（）;
                }
            }）。setNegativeButton（否，
            新DialogInterface.OnClickListener（）{
                公共无效的onClick（DialogInterface对话框，INT ID）{
                    dialog.cancel（）;
                }
            }）;
        AlertDialog警报= builder.create（）;
        alert.show（）;
    }

    私人最终的BroadcastReceiver mReceivedSMSReceiver =新的BroadcastReceiver（）{

        @覆盖
        公共无效的onReceive（上下文的背景下，意图意图）{
            串动= intent.getAction（）;

            如果（ACTION.equals（动作））
            {
                //您的短信处理code
                displayAlert（）;
            }
        }
    }
}
 

正如你在这里看到我从来没有所谓的的setContentView（）。这是因为活动将有一个透明的视图，只有所述警报对话框显示。

Good day, I am trying to show an alert dialog after a system reboot in a broadcast receiver. I have added the receiver in my manifest and called the required permission, but am getting an error in showing the dialog. Please How can i implement this correctly?.. Thank you

my code:

public void onReceive(final Context context, Intent intent) {
    Log.d(TAG, "received boot completed broadcast receiver... starting settings");


    String settings = context.getResources().getString(R.string.restart_setting);
        String yes = context.getResources().getString(R.string.Settings);
        String no = context.getResources().getString(R.string.Cancel);

              final AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.setMessage(settings)
                       .setCancelable(false)
                       .setPositiveButton(yes, new DialogInterface.OnClickListener() {
    public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) 
   Intent config = new Intent(context, WeatherConfigure.class)
     context.startActivity(config);

    }
 })
    .setNegativeButton(no, new DialogInterface.OnClickListener() {
        public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
             dialog.cancel();
        }
    });
  final AlertDialog alert = builder.create();
  alert.show();

    }

am getting this log error:

01-07 01:42:01.559: ERROR/AndroidRuntime(2004): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

01-07 01:42:01.559: ERROR/AndroidRuntime(2004): at android.view.ViewRoot.setView(ViewRoot.java:548)

01-07 01:42:01.559: ERROR/AndroidRuntime(2004):at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)

01-07 01:42:01.559: ERROR/AndroidRuntime(2004): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)

01-07 01:42:01.559: ERROR/AndroidRuntime(2004):at android.app.Dialog.show(Dialog.java:288)

01-07 01:42:01.559: ERROR/AndroidRuntime(2004):at com.MuaaApps.MyWeatherUpdate.myWeatherBroadcastReceiver.onReceive(MyWeatherBroadcastReceiver.java:59)

01-07 01:42:01.559: ERROR/AndroidRuntime(2004): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1994)

The problem is you are trying to show an AlertDialog from a BroadcastReceiver, which isn't allowed. You can't show an AlertDialog from a BroadcastReceiver. Only activities can display dialogs.

You should do something else, have the BroadcastReceiver start on boot as you do and start an activity to show the dialog.

Here is a blog post more on this.

EDIT:

Here is how I would recommend doing it. From your BroadcastReceiver start an Activity with an AlertDialog as such..

public class NotifySMSReceived extends Activity 
{
    private static final String LOG_TAG = "SMSReceiver";
    public static final int NOTIFICATION_ID_RECEIVED = 0x1221;
    static final String ACTION = "android.provider.Telephony.SMS_RECEIVED";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        IntentFilter filter = new IntentFilter(ACTION);
        this.registerReceiver(mReceivedSMSReceiver, filter);
    }

    private void displayAlert()
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("Are you sure you want to exit?").setCancelable(
            false).setPositiveButton("Yes",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            }).setNegativeButton("No",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });
        AlertDialog alert = builder.create();
        alert.show();
    }

    private final BroadcastReceiver mReceivedSMSReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (ACTION.equals(action)) 
            {
                //your SMS processing code
                displayAlert();
            }
        }
    }
}

As you see here I NEVER called setContentView(). This is because the activity will have a transparent view and only the alert dialog will show.