Android小部件Widget開發(fā)過程中的坑和問題小結

更新時間：2020年09月30日 14:26:46 作者：曲幽

這篇文章主要介紹了Android小部件Widget開發(fā)過程中的坑和問題小結,本文給大家介紹的非常詳細，對大家的學習或工作具有一定的參考借鑒價值，需要的朋友可以參考下

概述

官方參考

Build an App Widget

效果圖

放張效果圖，這是我玩的桌面 app 文件夾

AndroidManifest.xml

Receiver

切記里面的字母不要弄錯，最好復制粘貼再修改相對應自定義的地方就好，一個字母的錯誤搞了我一天，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項如 ListView，GridView 等，在綁定數(shù)據(jù)時需要使用 RemoteViewsService 并提供一個 RemoteViewsFactory 實例來填充數(shù)據(jù) 而非 Adapter
再提，這里面一定不能敲錯字母，特別是那個 permission 也一定要有，不然無法綁定數(shù)據(jù)

<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>

常用參數(shù)

Size

尺寸大小最終以單元格數(shù)據(jù)來顯示，但定義時為 dp
單元格數(shù)轉換基本工式 size = 70 x cells - 30
如：1格 = 70 x 1 - 30 = 40dp
最小尺寸定義時最好不要超過 4 個單元格就是 250dp

updatePeriodMillis

更新時間毫秒數(shù)，即間隔多少時間呼叫一次 onUpdate() 方法

initialLayout

加載布局文件

Using App Widgets with Collections

小部件中使用列表項

官方參考

Google Develper

AppWidgetProvider

public class DesktopWidget extends AppWidgetProvider {

 public String ACTION_START_ACTIVITY = "STARTACTIVITYACTION";

 public DesktopWidget() {
 super();
 }

 //當接收到廣播的時候會被調用
 //onUpdate, onEnabled等時都會發(fā)送廣播
 @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");
  }
 }
 }

 //被添加或者被更新時調用
 @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);
 //設定小部件上 TextView 值
 //views.setTextViewText(R.id.tv_widget_desktop_title, "ZGTools");
 //setRemoteAdapter設定Listivew,Gridview等復雜布局的adapter
 //第一個參數(shù)為要綁定的widget的Gridview的id，第二個參數(shù)為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);

 //綁定 item 的定點事件
 //Activity方式測試不成功，改用廣播的方式進行發(fā)送并執(zhí)行事件
 //此處不能是空的Intent 否則廣播無法發(fā)送
 //定義Intent事件模板，相當于公用設定，再在fillIntent里面設定具體的 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時調用，在這個方法中可以選擇性的根據(jù)界面大小顯示或隱藏某些控件
 @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

類型于 BaseAdapter，重點是 onCreate() 加載數(shù)據(jù)， getViewAt() 方法返回布局綁定數(shù)據(jù)

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() {
 	//這里我加了重新加載數(shù)據(jù)的調用，用于更新小部件的列表內容
		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);
 }

總結

到此這篇關于Android小部件Widget開發(fā)過程中的坑和總結的文章就介紹到這了,更多相關Android小部件Widget內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

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