Question

我在需要从服务类接收数据并将其传递给广播接收器的情况下工作。我可以在广播接收器中获取数据，但是无法显示AlertDialog。如何从广播接收器显示警报对话框。

Logcat

 java.lang.RuntimeException: Error receiving broadcast Intent { act=com.demo.cisive.cisivedemo.A_CUSTOM_INTENT flg=0x10 launchParam=MultiScreenLaunchParams { mDisplayId=0 mBaseDisplayId=0 mFlags=0 } bqHint=1 (has extras) } in com.carco.cisive.Utils.BroadcastTokenCheck@f8d9855
                                                                     at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:1195)
                                                                     at android.os.Handler.handleCallback(Handler.java:751)
                                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                     at android.os.Looper.loop(Looper.java:154)
                                                                     at android.app.ActivityThread.main(ActivityThread.java:6823)
                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1557)
                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1445)
                                                                  Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
                                                                     at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
                                                                     at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
                                                                     at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
                                                                     at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:83)
                                                                     at android.support.v7.app.AlertController.installContent(AlertController.java:231)
                                                                     at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:278)
                                                                     at android.app.Dialog.dispatchOnCreate(Dialog.java:478)
                                                                     at android.app.Dialog.show(Dialog.java:336)
                                                                     at com.carco.cisive.Utils.BroadcastTokenCheck.showDialog(BroadcastTokenCheck.java:54)
                                                                     at com.carco.cisive.Utils.BroadcastTokenCheck.onReceive(BroadcastTokenCheck.java:33)
                                                                     at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:1185)
                                                                     at android.os.Handler.handleCallback(Handler.java:751) 
                                                                     at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                     at android.os.Looper.loop(Looper.java:154) 
                                                                     at android.app.ActivityThread.main(ActivityThread.java:6823) 
                                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1557) 
                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1445)

BroadcastTokenCheck.java

public class BroadcastTokenCheck extends BroadcastReceiver {

      @Override
    public void onReceive(Context context, Intent intent) {

        String value=intent.getStringExtra("VALUE");
        boolean isBackground = intent.getBooleanExtra("isBackground",false);

       // if(!isBackground){
        if(value.equals("Completing")){
            Toast.makeText(context, value, Toast.LENGTH_SHORT).show();
            showDialog(context,"Warning","Session is going to expire");
        }
       // }
    }



    public void showDialog(final Context cnt,String Title,String message){
        final AlertDialog.Builder builder = new AlertDialog.Builder(cnt);
        // Set the Alert Dialog Message
        builder.setTitle(Title);
        builder.setMessage(message)
                .setCancelable(false)
                .setPositiveButton("OK",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int id) {
                                dialog.dismiss();
                            }
                        })
        .create()
        .show();
    }


}

Answer 1

使用BroadCastReceiver中的对话框主题开始活动

startActivity(new Intent(this, MsgDialogActivity.class));

清单中带有以下主题：

<activity android:name=".MsgDialogActivity"
            android:theme="@android:style/Theme.Dialog"/>

Answer 2

问题是您试图显示AlertDialog中的BroadcastReceiver，这是不允许的。您无法显示AlertDialog中的BroadcastReceiver。只有活动可以显示对话框。

您应该执行其他操作，使BroadcastReceiver像启动时一样在启动时启动，并启动活动以显示对话框。

您应该这样做。

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();
            }
        }
    }
}

这只是一个示例，因为您没有告诉hpow您要使用广播接收器，但这是可以解决的。

如何从广播接收器显示AlertDialog？

2 个答案: