android开发之APP Widget

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

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 AppWidgetProviderTest extends AppWidgetProvider {

//自定义一个ACTION常量

private final String USER_ACTION = "com.example.appwiget.USER_ACTION";

//当APP widget实例被删除时，会调用

@Override

public void onDeleted(Context context, int[] appWidgetIds) {

// TODO Auto-generated method stub

super.onDeleted(context, appWidgetIds);

System.out.println("onDeleted()");

}

//当最后一个app widget实例被删除时，会调用

@Override

public void onDisabled(Context context) {

// TODO Auto-generated method stub

super.onDisabled(context);

System.out.println("onDisabled()");

}

//当第一个App widget实例被创建时，会调用

@Override

public void onEnabled(Context context) {

// TODO Auto-generated method stub

super.onEnabled(context);

System.out.println("onEnabled()");

}

//接收app收到的所有广播事件

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

System.out.println("onReceive()");

//比较下，如果收到的广播是USER_ACTION，则输出信息,且更新桌面控件

if(USER_ACTION.equals(intent.getAction())){

System.out.println("onReceive --> " + USER_ACTION);

//获得RemoteViews对象

RemoteViews remoteView = new RemoteViews(context.getPackageName(),R.layout.appwidget_provider);

//更新桌面TextView控件的text

remoteView.setTextViewText(R.id.myText, "onReceive");

AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);

ComponentName componentName = new ComponentName(context, AppWidgetProviderTest.class);

appWidgetManager.updateAppWidget(componentName, remoteView);

}else{

//调用父类的方法

super.onReceive(context, intent);

}

}

//在到达指定的更新时间之后或者向桌面添加App widget实例时，会调用此方法

@Override

public void onUpdate(Context context, AppWidgetManager appWidgetManager,

int[] appWidgetIds) {

// TODO Auto-generated method stub

super.onUpdate(context, appWidgetManager, appWidgetIds);

System.out.println("onUpdate()");

//为每一个app widget实例绑定一个remoteViews监听器，每创建的一个app widget实例都有一个对应的ID

for(int i = 0; i < appWidgetIds.length; i ++){

System.out.println("appWidgetIds -->" + appWidgetIds[i]);

//创建一个Intent对象

Intent intent = new Intent();

//part 1：pendingIntent用来打开一个新的Activity

/*intent.setClass(context, MainActivity.class);

//使用getActivity方法创建一个pendingIntent对象，此对象用于跳转Activity，将intent打包给pendingIntent

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

*/

//end part1

//part 2：pendingIntent用来发送一个广播

//设置action

intent.setAction(USER_ACTION);

//使用getBroadcast()方法创建一个pendingIntent对象

PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);

//end part2

//创建一个RemoteViews对象

RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider);

//RemoteViews对象将Button和pendingIntent绑定。通过pendingIntent获得intent

remoteView.setOnClickPendingIntent(R.id.WidgetButton, pendingIntent);

appWidgetManager.updateAppWidget(appWidgetIds[i], remoteView);

}

}

}

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/hello_world" />

</RelativeLayout>

<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/myText"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="welcome appwidget"

android:background="#ff0000"

/>

<Button

android:id="@+id/WidgetButton"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Widget Button"

/>

</LinearLayout>

<appwidget-provider

xmlns:android="http://schemas.android.com/apk/res/android"

android:minWidth="180dp"

android:minHeight="40dp"

android:updatePeriodMillis="1000"

android:initialLayout="@layout/appwidget_provider"

>

</appwidget-provider>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.appwidget"

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" >

<activity

android:name="com.example.appwidget.MainActivity"

android:label="@string/app_name" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<receiver

android:name="com.example.appwidget.AppWidgetProviderTest">

<intent-filter>

<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>

</intent-filter>

<intent-filter ><!--自定义的过滤器  -->

<action android:name="com.example.appwiget.USER_ACTION"/>

</intent-filter>

<meta-data

android:name="android.appwidget.provider"

android:resource="@xml/appwidget_provider_info"/>

</receiver>

</application>

</manifest>