Android 桌面组件【widget】初探
- 1、AppWidget 框架类
- 2、在 Android 如何使用 Widget
- 3、AppWidget 框架的主要类介绍
- 4、DEMO 讲解
- 1、AppWidgetProvider :继承自 BroadcastRecevier , 在AppWidget 应用 update、enable、disable 和 delete 时接收通知。其中,onUpdate、onReceive 是最常用到的方法,它们接收更新通知。
- 2、 AppWidgetProvderInfo:描述 AppWidget 的大小、更新频率和初始界面等信息,以XML 文件形式存在于应用的 res/xml/目录下。
- 3、AppWidgetManger :负责管理 AppWidget ,向 AppwidgetProvider 发送通知。
- 4、RemoteViews :一个可以在其他应用进程中运行的类,向 AppWidgetProvider 发送通知。
- 1、长按主界面
- 2、之后弹出一个对话框,里面就有android 内置的一些桌面组件
- bindAppWidgetId(int appWidgetId, ComponentName provider)
通过给定的ComponentName 绑定appWidgetId
- getAppWidgetIds(ComponentName provider)
通过给定的ComponentName 获取AppWidgetId
- getAppWidgetInfo(int appWidgetId)
通过AppWidgetId 获取 AppWidget 信息
- getInstalledProviders()
返回一个List<AppWidgetProviderInfo>的信息
- getInstance(Context context)
获取 AppWidgetManger 实例使用的上下文对象
- updateAppWidget(int[] appWidgetIds, RemoteViews views)
通过appWidgetId 对传进来的 RemoteView 进行修改,并重新刷新AppWidget 组件
- updateAppWidget(ComponentName provider, RemoteViews views)
通过 ComponentName 对传进来的 RemoeteView 进行修改,并重新刷新AppWidget 组件
- updateAppWidget(int appWidgetId, RemoteViews views)
通过appWidgetId 对传进来的 RemoteView 进行修改,并重新刷新AppWidget 组件
- 1、onDeleted(Context context, int[] appWidgetIds)
- 2、onDisabled(Context context)
- 3、onEnabled(Context context)
- 4、onReceive(Context context, Intent intent)
Tip:因为 AppWidgetProvider 是继承自BroadcastReceiver 所以可以重写onRecevie 方法,当然必须在后台注册Receiver - 5、onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
- 1、新建AppWidgetProvderInfo
- 2、写一个类继承自AppWidgetProvider
- 3、后台注册Receiver
- 4、使 AppWidget 组件支持点击事件
- 5、如何使TextView 在两种文本间来回跳转
< appwidget-provider xmlns:android ="http://schemas.android.com/apk/res/android"
android:minWidth ="60dp"
android:minHeight ="30dp"
android:updatePeriodMillis ="86400000"
android:initialLayout ="@layout/main" >
</ appwidget-provider >
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int [] appWidgetIds) {}
@Override
public void onReceive(Context context, Intent intent) {}
< meta-data android:name ="android.appwidget.provider"
android:resource ="@xml/appwidget_provider" ></ meta-data >
< intent-filter >
< action android:name ="com.terry.action.widget.click" ></ action >
< action android:name ="android.appwidget.action.APPWIDGET_UPDATE" />
</ intent-filter >
</ receiver >
AppWidgetManager appWidgeManger, int appWidgetId) {
rv = new RemoteViews(context.getPackageName(), R.layout.main);
Intent intentClick = new Intent(CLICK_NAME_ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0 ,
intentClick, 0 );
rv.setOnClickPendingIntent(R.id.TextView01, pendingIntent);
appWidgeManger.updateAppWidget(appWidgetId, rv);
}
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
super .onReceive(context, intent);
if (rv == null ) {
rv = new RemoteViews(context.getPackageName(), R.layout.main);
}
if (intent.getAction().equals(CLICK_NAME_ACTION)) {
if (uitil.isChange) {
rv.setTextViewText(R.id.TextView01, context.getResources()
.getString(R.string.load));
} else {
rv.setTextViewText(R.id.TextView01, context.getResources()
.getString(R.string.change));
}
Toast.makeText(context, Boolean.toString(uitil.isChange),
Toast.LENGTH_LONG).show();
uitil.isChange = ! uitil.isChange;
}
AppWidgetManager appWidgetManger = AppWidgetManager
.getInstance(context);
int [] appIds = appWidgetManger.getAppWidgetIds( new ComponentName(
context, widgetProvider. class ));
appWidgetManger.updateAppWidget(appIds, rv);
}
代码
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;
import android.widget.Toast;
public class widgetProvider extends AppWidgetProvider {
private static final String CLICK_NAME_ACTION = " com.terry.action.widget.click " ;
private static RemoteViews rv;
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int [] appWidgetIds) {
// TODO Auto-generated method stub
final int N = appWidgetIds.length;
for ( int i = 0 ; i < N; i ++ ) {
int appWidgetId = appWidgetIds[i];
updateAppWidget(context, appWidgetManager, appWidgetId);
}
}
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
super .onReceive(context, intent);
if (rv == null ) {
rv = new RemoteViews(context.getPackageName(), R.layout.main);
}
if (intent.getAction().equals(CLICK_NAME_ACTION)) {
if (uitil.isChange) {
rv.setTextViewText(R.id.TextView01, context.getResources()
.getString(R.string.load));
} else {
rv.setTextViewText(R.id.TextView01, context.getResources()
.getString(R.string.change));
}
Toast.makeText(context, Boolean.toString(uitil.isChange),
Toast.LENGTH_LONG).show();
uitil.isChange = ! uitil.isChange;
}
AppWidgetManager appWidgetManger = AppWidgetManager
.getInstance(context);
int [] appIds = appWidgetManger.getAppWidgetIds( new ComponentName(
context, widgetProvider. class ));
appWidgetManger.updateAppWidget(appIds, rv);
}
public static void updateAppWidget(Context context,
AppWidgetManager appWidgeManger, int appWidgetId) {
rv = new RemoteViews(context.getPackageName(), R.layout.main);
Intent intentClick = new Intent(CLICK_NAME_ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0 ,
intentClick, 0 );
rv.setOnClickPendingIntent(R.id.TextView01, pendingIntent);
appWidgeManger.updateAppWidget(appWidgetId, rv);
}
}