概述

官方参考

Build an App Widget

效果图

放张效果图，这是我玩的桌面 app 文件夹

AndroidManifest.xml

Receiver

切记里面的字母不要弄错，最好复制粘贴再修改相对应自定义的地方就好，一个字母的错误搞了我一天，吐血

<receiver android:name=".desktop.DesktopWidget"> <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget_desktop_options" /> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /> </intent-filter></receiver>

Service

如果小部件中使用到了列表项如 ListView，GridView 等，在绑定数据时需要使用 RemoteViewsService 并提供一个 RemoteViewsFactory 实例来填充数据 而非 Adapter
再提，这里面一定不能敲错字母，特别是那个 permission 也一定要有，不然无法绑定数据

<service android:name=".desktop.DesktopViewsService" android:permission="android.permission.BIND_REMOTEVIEWS" />

Options

res/xml/

widget_desktop_options.xml

<?xml version="1.0" encoding="utf-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="40dp" android:minHeight="40dp" android:initialLayout="@layout/widget_desktop" android:resizeMode="horizontal|vertical" android:widgetCategory="home_screen"></appwidget-provider>

常用参数

Size

• 尺寸大小最终以单元格数据来显示，但定义时为 dp
• 单元格数转换基本工式 size = 70 x cells - 30
• 如：1格 = 70 x 1 - 30 = 40dp
• 最小尺寸定义时最好不要超过 4 个单元格就是 250dp

updatePeriodMillis

更新时间毫秒数，即间隔多少时间呼叫一次 onUpdate() 方法

initialLayout

加载布局文件

Using App Widgets with Collections

小部件中使用列表项

官方参考

Google Develper

AppWidgetProvider

public class DesktopWidget extends AppWidgetProvider { public String ACTION_START_ACTIVITY = "STARTACTIVITYACTION"; public DesktopWidget() { super(); } //当接收到广播的时候会被调用 //onUpdate, onEnabled等时都会发送广播 @Override public void onReceive(Context context, Intent intent) { super.onReceive(context, intent); pub.log("onReceive:" + intent.getAction()); if (intent.getAction().equals(ACTION_START_ACTIVITY)) { String strPackage = intent.getStringExtra("app_package"); Intent appIntent = context.getPackageManager().getLaunchIntentForPackage(strPackage); pub.log(appIntent.getPackage()); if (appIntent != null) { appIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); pub.log("start activity"); context.startActivity(appIntent); pub.log("finish"); } } } //被添加或者被更新时调用 @Override public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { super.onUpdate(context, appWidgetManager, appWidgetIds); // There may be multiple widgets active, so update all of them for (int appWidgetId : appWidgetIds) { updateAppWidget(context, appWidgetManager, appWidgetId); } } private void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int appWidgetId) { pub.log("onUpdate:" + appWidgetId); // Construct the RemoteViews object RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_desktop); //设定小部件上 TextView 值 //views.setTextViewText(R.id.tv_widget_desktop_title, "ZGTools"); //setRemoteAdapter设定Listivew,Gridview等复杂布局的adapter //第一个参数为要绑定的widget的Gridview的id，第二个参数为RemoteViewsService的intent Intent intent = new Intent(context, DesktopViewsService.class); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME))); views.setRemoteAdapter(R.id.gv_app_group, intent); //绑定 item 的定点事件 //Activity方式测试不成功，改用广播的方式进行发送并执行事件 //此处不能是空的Intent 否则广播无法发送 //定义Intent事件模板，相当于公用设定，再在fillIntent里面设定具体的 extra 值 Intent templateIntent = new Intent(context, DesktopWidget.class); templateIntent.setAction(ACTION_START_ACTIVITY); templateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); templateIntent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME))); PendingIntent pendingIntent = PendingIntent.getBroadcast(context, appWidgetId, templateIntent, PendingIntent.FLAG_UPDATE_CURRENT); views.setPendingIntentTemplate(R.id.gv_app_group, pendingIntent); // Instruct the widget manager to update the widget appWidgetManager.updateAppWidget(appWidgetId, views); } //被添加或者更改大小时调用，在这个方法中可以选择性的根据界面大小显示或隐藏某些控件 @Override public void onAppWidgetOptionsChanged(Context context, AppWidgetManager appWidgetManager, int appWidgetId, Bundle newOptions) { super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId, newOptions); updateAppWidget(context, appWidgetManager, appWidgetId); } @Override public void onEnabled(Context context) { super.onEnabled(context); // Enter relevant functionality for when the first widget is created } @Override public void onDisabled(Context context) { super.onDisabled(context); // Enter relevant functionality for when the last widget is disabled }}

RemoteViewsService

public class DesktopViewsService extends RemoteViewsService { @Override public RemoteViewsFactory onGetViewFactory(Intent intent) { return new DesktopViewsFactory(this, intent); }}

RemoteViewsFactory

类型于 BaseAdapter，重点是 onCreate() 加载数据， getViewAt() 方法返回布局绑定数据

public class DesktopViewsFactory implements RemoteViewsService.RemoteViewsFactory { private Context mContext; private int mAppWidgetId; private List<AppPackage> lstApps = new ArrayList<AppPackage>(); public DesktopViewsFactory(Context context, Intent intent){ this.mContext = context; this.mAppWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); } @Override public void onCreate() { DesktopDbHelper dbHelper = new DesktopDbHelper(mContext); SQLiteDatabase db = dbHelper.getReadableDatabase(); String strSql = "Select * from tb_app"; try { Cursor cursor = db.rawQuery(strSql, null); if (cursor != null && cursor.getCount() > 0) { lstApps.clear(); while (cursor.moveToNext()) { byte[] blob = cursor.getBlob(cursor.getColumnIndex("app_icon")); Bitmap bmpIcon = BitmapFactory.decodeByteArray(blob, 0, blob.length); String strLabel = cursor.getString(cursor.getColumnIndex("app_label")); String strPackage = cursor.getString(cursor.getColumnIndex("app_package")); lstApps.add(new AppPackage(strLabel, strPackage, bmpIcon)); } } if (cursor != null) { cursor.close(); } } catch (Exception e) { db.close(); e.printStackTrace(); } db.close(); } @Override public void onDataSetChanged() { //这里我加了重新加载数据的调用，用于更新小部件的列表内容 onCreate(); } @Override public void onDestroy() {} @Override public int getCount() {return 0;} @Override public RemoteViews getViewAt(int i) { if (i < 0 || i >= lstApps.size()) return null; //Construct a remote views item based on the app widget item XML file RemoteViews views = new RemoteViews(mContext.getPackageName(), R.layout.widget_desktop_item); views.setTextViewText(R.id.tv_widget_desktop_label, lstApps.get(i).getAppLabel()); views.setImageViewBitmap(R.id.iv_widget_desktop_icon, lstApps.get(i).getAppIcon()); Intent intent = new Intent(); Bundle bundle = new Bundle(); bundle.putString("app_package", lstApps.get(i).getAppPackage()); intent.putExtras(bundle); views.setOnClickFillInIntent(R.id.iv_widget_desktop_icon, intent); views.setOnClickFillInIntent(R.id.tv_widget_desktop_label, intent); return views; } @Override public RemoteViews getLoadingView() { return null;} @Override public int getViewTypeCount() {return 0;} @Override public long getItemId(int i) { return 0;} @Override public boolean hasStableIds() { return false; }}

DesktopActivity

//更新widget布局 private void updateWidget(){ AppWidgetManager widgetManager = AppWidgetManager.getInstance(this); ComponentName componentName = new ComponentName(this, DesktopWidget.class); int[] ids = widgetManager.getAppWidgetIds(componentName); widgetManager.notifyAppWidgetViewDataChanged(ids, R.id.gv_app_group); }

总结

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