首页 > 其他 > 详细

Widget的点击事件

时间:2014-02-09 20:48:49      阅读:452      评论:0      收藏:0      [点我收藏+]

本文实现Widget中的按钮点击事件,点击一次下面的按钮,上面的数字减少1。

bubuko.com,布布扣bubuko.com,布布扣bubuko.com,布布扣

首先是Manifest文件:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
<?xml version="1.0" encoding="utf-8"?>
    package="com.example.widget_sample"
    android:versionCode="1"
    android:versionName="1.0" >
  
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
  
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
          
        <receiver android:name=".MainActivity" android:label="WIDGET_SAMPLE">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <meta-data android:name="android.appwidget.provider" android:resource="@xml/my_widget" />
        </receiver>
          
        <service android:name="MainActivity$MyService" >
      <intent-filter>
                <action android:name="Widget.Button.Click"></action>
            </intent-filter>
        </service>
  
    </application>
  
</manifest>

需要注意的是在MainActivity$MyService中定义的<intent-filter>,其中的Widget.Button.Click是自己定义的Action,如果没有加上这个Action,就无法收到点击按钮时发出的Action,也就不会更新Widget。

Java文件:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
package com.example.widget_sample;
 
import java.util.Timer;
 
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.RemoteViews;
 
public class MainActivity extends AppWidgetProvider{
     
    public Context context;
    static int num = 100;
    static String tag_action = "Widget.Button.Click";
     
    public void onUpdate(Context con, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        context = con;
        Intent intent = new Intent(context, MyService.class);
        context.startService(intent);
    }
     
    //MyService服务程序
    public static class MyService extends Service {
         
        public void onStart(Intent intent, int startId){
            ComponentName thisWidget = new ComponentName(this, MainActivity.class);
            AppWidgetManager manager = AppWidgetManager.getInstance(this);
             
            RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.activity_main);
            // 点击按钮时
            if (intent.getAction() != null){
                if (intent.getAction().equals(tag_action)){
                    num--;                 
                }
            }
            remoteViews.setTextViewText(R.id.textView1, String.valueOf(num));
            // 定义一个Intent来发送按钮Action
            Intent prevInten = new Intent();
            prevInten.setAction(tag_action);
            // 用Intent实例化一个PendingIntent
            PendingIntent Pprevintent=PendingIntent.getService(this, 0,
                    prevInten, 0);
            // 给RemoteView上的Button设置按钮事件
            remoteViews.setOnClickPendingIntent(R.id.button1, Pprevintent);
            manager.updateAppWidget(thisWidget, remoteViews);
        }
 
        @Override
        public IBinder onBind(Intent arg0) {
            // TODO Auto-generated method stub
            return null;
        }
             
    }
}

首先,定义一个Intent,Action设置为"Widget.Button.Click",然后再用该Intent实例化一个PendingIntent,用RemoteViews.setOnClickPendingIntent()函数将PendingIntent和点击按钮的事件关联起来,最后更新Widget。

服务onStart()时,用Intent.getAction()函数得到Intent的Action,并判断是否是"Widget.Button.Click",如果是,表明这是单击按钮发出的Intent,num--,然后再更新Widget。这样就实现了单击按钮一次,num的值减少1。

Widget的点击事件

原文:http://www.cnblogs.com/mstk/p/3541770.html

(0)
(0)
   
举报
评论 一句话评论(0
关于我们 - 联系我们 - 留言反馈 - 联系我们:wmxa8@hotmail.com
© 2014 bubuko.com 版权所有
打开技术之扣,分享程序人生!