Android桌面组件App Widget完整案例

本文实例讲述了android桌面组件app widget用法。分享给大家供大家参考。具体如下：

这里模拟一个案例：把appwidget添加到桌面后，点击appwidget后appwidget文本会轮回改变

main.xml布局文件：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <textview android:id="@+id/tv"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  android:text="程序入口" 
  android:textsize="50dip"/>
</linearlayout>

res/xml/my_appwidget.xml布局文件：

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:minwidth="120dp" 
 android:minheight="60dp"
 android:updateperiodmillis="1000"
 android:initiallayout="@layout/main">
</appwidget-provider>

清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.ljq.activity" android:versioncode="1"
 android:versionname="1.0">
 <application android:icon="@drawable/icon"
  android:label="@string/app_name">
  <receiver android:name=".testactivity">
   <meta-data android:name="android.appwidget.provider"
    android:resource="@xml/my_appwidget">
   </meta-data>
   <intent-filter>
    <action android:name="com.ljq.action.widget.click"></action>
    <action android:name="android.appwidget.action.appwidget_update" />
   </intent-filter>
  </receiver>
 </application>
 <uses-sdk android:minsdkversion="7" />
</manifest>

变量类utiltool：用来控件文本改变：

package com.ljq.activity;
public class utiltool {
 public static boolean ischange=true;
}

testactivity类，继承自appwidgetprovider：

package com.ljq.activity;
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.widget.remoteviews;
public class testactivity extends appwidgetprovider {
 // 自定义一个action名
 private static final string action_click_name = "com.ljq.action.widget.click";
 private remoteviews rv;
 @override
 public void onupdate(context context, appwidgetmanager appwidgetmanager, int[] appwidgetids) {
  system.out.println("onupdate");
  //获取r.layout.main布局，通过类remoteviews对布局r.layout.main里的控件进行操作
  /*rv = new remoteviews(context.getpackagename(), r.layout.main);
  intent intentclick = new intent(action_click_name);
  pendingintent pendingintent = pendingintent.getbroadcast(context, 0, intentclick, 0);
  rv.setonclickpendingintent(r.id.tv, pendingintent);
  componentname cmp = new componentname(context, testactivity.class);
  appwidgetmanager myappwidgetmanager = appwidgetmanager.getinstance(context);
  myappwidgetmanager.updateappwidget(cmp, rv);*/
  final int n = appwidgetids.length;
  for (int i = 0; i < n; i++) {
   int appwidgetid = appwidgetids[i];
   updateappwidget(context, appwidgetmanager, appwidgetid);
  }
 }
 //appwidget生命周期: 每接收一次，广播执行一次为一个生命周期结束。
 //也就是说在重写appwidgetprovider类里面声明全局变量做状态判断，
 //每次状态改变appwidgetprovider再接收第二次广播时即为你重新初始化也就是说重新实例化了一次appwidgetprovider。
 //今天我因为在里面放了一个boolean值初始化为true，观察调试看到每次进入都为true故你在设置桌面组件时，
 //全局变量把它声明在另外一个实体类用来判断是没问题的，切忌放在本类。
 @override
 public void onreceive(context context, intent intent) {
  system.out.println("onreceive");
  if (rv == null) {
   rv = new remoteviews(context.getpackagename(), r.layout.main);
  }
  if (intent.getaction().equals(action_click_name)) {
   if (utiltool.ischange) {
    rv.settextviewtext(r.id.tv, "abc");
   } else {
    rv.settextviewtext(r.id.tv, "123");
   }
   utiltool.ischange = !utiltool.ischange;
   appwidgetmanager appwidgetmanger = appwidgetmanager.getinstance(context);
   int[] appids = appwidgetmanger.getappwidgetids(new componentname(context, testactivity.class));
   appwidgetmanger.updateappwidget(appids, rv);
  }else{
   super.onreceive(context, intent);
  }
 }
 private void updateappwidget(context context,
  appwidgetmanager appwidgemanger, int appwidgetid) {
  rv = new remoteviews(context.getpackagename(), r.layout.main);
  intent intentclick = new intent();
  intentclick.setaction(action_click_name);
  pendingintent pendingintent = pendingintent.getbroadcast(context, 0, intentclick, 0);
  rv.setonclickpendingintent(r.id.tv, pendingintent);
  appwidgemanger.updateappwidget(appwidgetid, rv);
 }
}

希望本文所述对大家的android程序设计有所帮助。