2020年9月29日星期二

Android小部件Widget开发过程中的坑和总结

Android小部件Widget的简单实例,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。绑定 item 的定点事件,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。

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目录
  • 概述
    • 官方参考
    • 效果图
  • AndroidManifest.
  • Receiver
  • Service
  • Options
    • res/
    • widget_desktop_options.
  • 常用参数
    • Size
    • updatePeriodMillis
    • initialLayout
  • Using App Widgets with Collections
    • 官方参考
    • AppWidgetProvider
    • RemoteViewsService
    • RemoteViewsFactory
    • DesktopActivity
  • 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

    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="@

    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

    <?

    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 

    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); }

    原文转载:http://www.shaoqun.com/a/478763.html

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    Android小部件Widget的简单实例,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。绑定item的定点事件,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。@目录概述官方参考效果图Androi
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