关键词 widget，AppWidgetID，桌面，小部件，Android，安卓，点击，Action

主要是intent传递时候不能用 intent.putExtra 来传递要保留的数据，而是直接用intent.setAction来传递

package hello.world.myapplication;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;
import android.widget.RemoteViews;
import android.widget.TextView;
import android.widget.Toast;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import static android.content.ContentValues.TAG;

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


public class NewAppWidget extends AppWidgetProvider {
    private static final String CLICK_ACTION="callChangePic";

    void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                                int appWidgetId) {
// Construct the RemoteViews object
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);
        views.setTextViewText(R.id.appwidget_text, ""+appWidgetId);
        views.setOnClickPendingIntent(R.id.appwidget_text,getPendingSelfIntent(context,CLICK_ACTION,appWidgetId));
// Instruct the widget manager to update the widget
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }

    //小部件被添加时或者每次小部件更新时都会调用一次该方法，，每
// 个周期小部件都会自动更新一次，不是点击的时候更新，
// 而是到指定配置文件时间的时候才更新
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
// There may be multiple widgets active, so update all of them
        for (int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId);
        }
    }

    @Override
    public void onEnabled(Context context) {
// Enter relevant functionality for when the first widget is created
    }

    @Override
    public void onDisabled(Context context) {
// Enter relevant functionality for when the last widget is disabled
    }

    protected PendingIntent getPendingSelfIntent(Context context, String action, int appWidgetId) {
        Intent intent = new Intent(context, getClass());
        intent.setAction(CLICK_ACTION+String.valueOf(appWidgetId));
        return PendingIntent.getBroadcast(context, 0, intent, 0);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);
        String action = intent.getAction();
        if (action.startsWith(CLICK_ACTION))
        {
            int widgetId = Integer.parseInt(action.substring(CLICK_ACTION.length()));
            Toast.makeText(context,"当前点击的ID__"+widgetId,Toast.LENGTH_LONG).show();
            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        }
    }

}

abc

下面这种也可以点击显示当前ID号，不过问题是新建时候也会跑进去一次，android:updatePeriodMillis时间到了，又跑进去一次

package com.jessicathornsby.widget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.widget.RemoteViews;
import android.app.PendingIntent;
import android.content.Intent;
import android.net.Uri;
import java.text.DateFormat;
import java.util.Date;
import android.widget.Toast;


public class NewAppWidget extends AppWidgetProvider {
    static void updateAppWidget(Context context,
                                AppWidgetManager appWidgetManager,
                                int appWidgetId) {

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

        Intent intentUpdate = new Intent(context, NewAppWidget.class);
        intentUpdate.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);


        int[] idArray = new int[]{appWidgetId};
        intentUpdate.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, idArray);

        PendingIntent pendingUpdate = PendingIntent.getBroadcast(
                context, appWidgetId, intentUpdate,
                PendingIntent.FLAG_UPDATE_CURRENT);
        views.setOnClickPendingIntent(R.id.update, pendingUpdate);
//Request that the AppWidgetManager updates the application widget, by passing widgetId and the RemoteViews object//

        appWidgetManager.updateAppWidget(appWidgetId, views);
    }


    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        for (int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId);
            Toast.makeText(context, appWidgetId+"ID" +
                    "==Widget has been updated! ", Toast.LENGTH_SHORT).show();
        }
    }
}