import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
/**
 * Created by smyhvae on 2016/9/7.
 */
public class TestWidget extends AppWidgetProvider{
 @Override
 public void onReceive(Context context, Intent intent) {
  super.onReceive(context, intent);
 }
} 

 <!-- 声明widget对应的AppWidgetProvider -->
  <receiver android:name=".TestWidget">
   <intent-filter>
    <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
   </intent-filter>
   <meta-data
    android:name="android.appwidget.provider"
    android:resource="@layout/widget_setting"/>
  </receiver> 

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:initialLayout="@layout/layout_widget"
     android:minHeight="140dp"
     android:minWidth="140dp"
     android:previewImage="@mipmap/ic_launcher"
     android:updatePeriodMillis="20000"
     android:widgetCategory="home_screen"
 >
</appwidget-provider> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
 <TextView
  android:id="@+id/textView"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:text="Large Text"
  android:textAppearance="?android:attr/textAppearanceLarge"/>
 <Button
  android:id="@+id/button2"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:text="New Button"/>
</LinearLayout> 

  @Override
 public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
  super.onUpdate(context, appWidgetManager, appWidgetIds);
  RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.layout_widget);//需要构造一个RemoteViews
  Intent intent = new Intent();
  intent.setClass(context, TestWidget.class); //通过intent把广播发给TestWidget本身，TestWidget接受到广播之后，会调用。。进而刷新借鉴  // 。
  intent.setAction(WIDGET_BTN_ACTION);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
  remoteViews.setOnClickPendingIntent(R.id.widget_btn, pendingIntent);//控件btn_widget的点击事件：点击按钮时，会发一个带action的广播。
  appWidgetManager.updateAppWidget(appWidgetIds, remoteViews); //点击完了之后，记得更新一下。
 } 

 @Override
 public void onReceive(Context context, Intent intent) {
  super.onReceive(context, intent);
  if (intent != null && TextUtils.equals(intent.getAction(), WIDGET_BTN_ACTION)) { //当intent不为空，且action匹配成功时，就接收广播，然后点击事件成功
   Log.i(WIDGET_BTN_ACTION, "is clicked");
   //接下来开始做点击事件里面的内容
   RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.layout_widget);//注意：需要【重新】构造一个RemoteViews
   remoteViews.setTextViewText(R.id.widget_tv, "be clicked");
   remoteViews.setTextColor(R.id.widget_tv, Color.RED);
   AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);// 单例模式
   ComponentName componentName = new ComponentName(context, TestWidget.class);
   appWidgetManager.updateAppWidget(componentName, remoteViews);//setText之后，记得更新一下
  }
 } 

 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.graphics.Color;
import android.text.TextUtils;
import android.util.Log;
import android.widget.RemoteViews;
/**
 * Created by smyhvae on 2016/9/7.
 */
public class TestWidget extends AppWidgetProvider {
 public static final String WIDGET_BTN_ACTION = "widget_btn_action";
 @Override
 public void onReceive(Context context, Intent intent) {
  super.onReceive(context, intent);
  if (intent != null && TextUtils.equals(intent.getAction(), WIDGET_BTN_ACTION)) { //当intent不为空，且action匹配成功时，就接收广播，然后点击事件成功
   Log.i(WIDGET_BTN_ACTION, "is clicked");
   //接下来开始做点击事件里面的内容
   RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.layout_widget);//注意：需要【重新】构造一个RemoteViews
   remoteViews.setTextViewText(R.id.widget_tv, "be clicked");
   remoteViews.setTextColor(R.id.widget_tv, Color.RED);
   AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);// 单例模式
   ComponentName componentName = new ComponentName(context, TestWidget.class);
   appWidgetManager.updateAppWidget(componentName, remoteViews);//setText之后，记得更新一下
  }
 }
 @Override
 public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
  super.onUpdate(context, appWidgetManager, appWidgetIds);
  RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.layout_widget);//需要构造一个RemoteViews
  Intent intent = new Intent();
  intent.setClass(context, TestWidget.class); //通过intent把广播发给TestWidget本身，TestWidget接受到广播之后，会调用。。进而刷新借鉴  // 。
  intent.setAction(WIDGET_BTN_ACTION);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
  remoteViews.setOnClickPendingIntent(R.id.widget_btn, pendingIntent);//控件btn_widget的点击事件：点击按钮时，会发一个带action的广播。
  appWidgetManager.updateAppWidget(appWidgetIds, remoteViews); //点击完了之后，记得更新一下。
 }
}