在屏幕上添加Widget:或长按屏幕空白处,或找到WidgetPreview App选择。原生系统4.0以下使用长按方式,4.0及以上 打开WIDGETS
创建Widget的一般步骤:
在menifest中
<receiver android:name="com.stone.ui.TimerWidgetProvider"> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/> <!-- 自定义action --> <action android:name="com.stone.action.start"/> </intent-filter> <meta-data android:name="android.appwidget.provider" android:resource="@xml/timer_widget_provider"/> <!-- android:resource="" 定义了Widget的信息使用timer_widget_provider.xml描述 --> </receiver>
<?xml version="1.0" encoding="utf-8"?> <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="180dp" android:minHeight="40dp" android:updatePeriodMillis="5000" android:previewImage="@drawable/ic_launcher" android:initialLayout="@layout/timer_widget" android:resizeMode="horizontal|vertical" > <!-- 计算size的公式: (70*n) -30 n为部件所需的大小(占几格) 当前的就是 3X1 minResizeWidth minResizeHeight 能被调整的最小宽高,若大于minWidth minHeight 则忽略 label 选择部件时看到标签 icon 选择部件时看到图标 updatePeriodMillis 更新时间间隔 previewImage 选择部件时 展示的图像 3.0以上使用 initialLayout 布局文件 resizeMode 调整size模式 configure 如果需要在启动前先启动一个Activity进行设置,在这里给出Activity的完整类名 autoAdvanceViewId=@id/xx 与集合部件一起使用,指定应该通过部件的host自动提前的视图ID 集合部件:3.0后才有。view:ListView、GridView、StackView、AdapterViewFilpper --> </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="horizontal" android:background="@drawable/widget_background" > <TextView android:id="@+id/counter" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:text="00:00" android:singleLine="true" android:textAppearance="?android:attr/textAppearance"/> <ImageView android:id="@+id/start_stop" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:scaleType="center" android:src="@android:drawable/ic_media_play"/> </LinearLayout>
package com.stone.ui; import java.util.Arrays; import com.stone.R; import com.stone.service.TimerWidgetService; import android.app.PendingIntent; import android.appwidget.AppWidgetHost; import android.appwidget.AppWidgetManager; import android.appwidget.AppWidgetProvider; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.text.format.DateUtils; import android.widget.RemoteViews; /* * AppWidgetProvider 必须要接收android.appwidget.action.APPWIDGET_UPDATE 广播 * */ public class TimerWidgetProvider extends AppWidgetProvider { @Override //更新部件时调用,在第1次添加部件时也会调用 public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { super.onUpdate(context, appWidgetManager, appWidgetIds); System.out.println("onUpdate widget:" + Arrays.toString(appWidgetIds)); /* * 构造pendingIntent发广播,onReceive()根据收到的广播,更新 */ Intent intent = new Intent(context, TimerWidgetService.class); PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0); RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.timer_widget); rv.setOnClickPendingIntent(R.id.start_stop, pendingIntent); appWidgetManager.updateAppWidget(appWidgetIds, rv); } @Override //部件从host中删除 public void onDeleted(Context context, int[] appWidgetIds) { super.onDeleted(context, appWidgetIds); System.out.println("onDeleted widget"); } @Override //第1次创建时调用,之后再创建不会调用 public void onEnabled(Context context) { super.onEnabled(context); System.out.println("onEnabled widget"); } @Override //当最后一个部件实例 被删除时 调用 用于清除onEnabled执行的操作 public void onDisabled(Context context) { super.onDisabled(context); System.out.println("onDisabled widget"); } @Override // public void onReceive(Context context, Intent intent) { super.onReceive(context, intent); System.out.println("onReceive widget"); /* * 接收 <action android:name="com.stone.action.start"/> 在其他组件或activity或service中发送这些广播 */ if (intent.getAction().equals("com.stone.action.start")) { long time = intent.getLongExtra("time", 0); updateWidget(context, time); System.out.println("receive com.stone.action.start"); } } private void updateWidget(Context context, long time) { //RemoteViews处理异进程中的View RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.timer_widget); System.out.println("time=" + time); rv.setTextViewText(R.id.counter, DateUtils.formatElapsedTime(time / 1000)); AppWidgetManager am = AppWidgetManager.getInstance(context); int[] appWidgetIds = am.getAppWidgetIds(new ComponentName(context, TimerWidgetProvider.class)); am.updateAppWidget(appWidgetIds, rv);//更新 所有实例 } }
package com.stone.service; import android.app.Service; import android.content.Intent; import android.os.IBinder; public class TimerWidgetService extends Service { @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { /* * do some thing */ //发送广播通知 widget 更新 状态 sendBroadcast(new Intent("com.stone.action.start").putExtra("time", System.currentTimeMillis())); return Service.START_STICKY; } }
Android Widget 小部件(一) 简单实现,布布扣,bubuko.com
原文地址:http://blog.csdn.net/jjwwmlp456/article/details/38466969