Java 如何在android studio中单击主屏幕小部件来显示祝酒词？

请告诉我我做错了什么

NewAppWidget.java class

package com.example.kinjolnath.alert;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.RemoteViews;

/**
 * Implementation of App Widget functionality.
 */

public class NewAppWidget extends AppWidgetProvider {
    private static final String TAG = NewAppWidget.class.getSimpleName();

void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                            int appWidgetId) {
    Log.d(TAG, "Inside updateAppWidget");
    Log.i(TAG, "Inside updateAppWidget");
    Log.e(TAG, "Inside updateAppWidget");


//        Toast.makeText(context,
//                "Should appear at widget click", Toast.LENGTH_SHORT).show();

    // Construct the RemoteViews object
    Intent intent = new Intent(context, MapsActivity.class);

    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
            intent,PendingIntent.FLAG_UPDATE_CURRENT);

    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);

    views.setOnClickPendingIntent(R.id.imageButton, pendingIntent);
    Intent sendingIntent = new Intent(context, SendingService.class);
    sendingIntent.setAction(SendingService.ACTION_SEND_MESSAGE);
    PendingIntent sendingPendingIntent = PendingIntent.getService(context, 0, sendingIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    views.setOnClickPendingIntent(R.id.imageButton, sendingPendingIntent);
    // Instruct the widget manager to update the widget
    appWidgetManager.updateAppWidget(appWidgetId, views);
}


@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    // There may be multiple widgets active, so update all of them
    Log.d(TAG, "Inside onUpdate");
    Log.i(TAG, "Inside onUpdate");
    Log.e(TAG, "Inside onUpdate");
    SendingService.startActionSendMessage(context);
    for (int appWidgetId : appWidgetIds) {
        updateAppWidget(context, appWidgetManager, appWidgetId);
    }
}

@Override
public void onEnabled(Context context) {
    // Enter relevant functionality for when the first widget is created
    Log.d(TAG, "Inside onEnabled");
    Log.i(TAG, "Inside onEnabled");
    Log.e(TAG, "Inside onEnabled");
}

@Override
public void onDisabled(Context context) {
    // Enter relevant functionality for when the last widget is disabled
    Log.d(TAG, "Inside onDisabled");
    Log.i(TAG, "Inside onDisabled");
    Log.e(TAG, "Inside onDisabled");
    }
}

SendingService.java类

package com.example.kinjolnath.alert;

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;

/**
 * Created by kinjolnath on 01-06-2017.
 */

public class SendingService extends IntentService{
    private static final String TAG = NewAppWidget.class.getSimpleName();
    /**
     * Creates an IntentService.  Invoked by your subclass's constructor.
     *
 * @param name Used to name the worker thread, important only for debugging.
 */
public static final String ACTION_SEND_MESSAGE = "com.example.MapsActivity.action.send_message";

public SendingService(String name) {
    super(name);
}

public static void startActionSendMessage(Context context){
    Intent intent = new Intent(context, SendingService.class);
    intent.setAction(ACTION_SEND_MESSAGE);
    context.startService(intent);
    Log.d(TAG, "Inside startActionSendMessage");
    Log.i(TAG, "Inside startActionSendMessage");
    Log.e(TAG, "Inside startActionSendMessage");
}

@Override
protected void onHandleIntent(@Nullable Intent intent) {
    if (intent != null){
        final String action = intent.getAction();
        Log.d(TAG, action + "inside onHandleIntent");
        if(ACTION_SEND_MESSAGE.equals(action)){
            handleActionSend();
        }
    }
}
//handleActionSend method:
private void handleActionSend() {
    Toast.makeText(this, "Message sent", Toast.LENGTH_SHORT).show();
    Log.d(TAG, "Inside handleActionSend");
    Log.i(TAG, "Inside handleActionSend");
    Log.e(TAG, "Inside handleActionSend");
    }
}

我遵循了Udacity的教程，并在这个阶段结束，但它仍然不起作用 我是android开发新手，希望您能给予我帮助。

请看以下内容：

---

如果toast没有显示，那么它可能没有使用UI线程。您可以尝试使用applicationContext来代替它，尽管我不确定这是否有效。我不喜欢在UI不可见时运行Toast，但我已经运行了Toast以用于特定测试，而不必查看日志。

您不能在单击小部件时显示Toast，因为小部件扩展了AppWidgetProvider，因此类无法调用当前上下文

如果您想在可以使用以下代码创建小部件或选择小部件时显示Toast：

Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(context,"hiii dhruv", Toast.LENGTH_LONG).show();
            }
        });

==========================================================================

如何在小部件类中使用上述代码

@Override
    public void onUpdate(final Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(context,"hiii dhruv", Toast.LENGTH_LONG).show();
            }
        });

    }

====================================================================

或

---

你的日志到处都有用吗？也就是说，

Toast

是唯一不起作用的东西吗？Toast会为您的代码添加注释。@MikeM。handleActionSend中的日志不可用working@santoshkumar敬酒词在handleActionSend方法中。您提供的链接帮助很大。我在OnReceive方法上做了一个重写，现在它可以工作了。thanks@kinjol是的，你是对的，如果你喜欢我的代码，那么请在上面做正确的标记。谢谢

 @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);
        Toast.makeText(context, "hiiiiiiiiiiii", Toast.LENGTH_SHORT).show();
    }