我可以在片段中使用AppWidgetHost吗？我无法将大多数小部件添加到我的AppWidgetHost中进行更新.这是我的情景..
LauncherActivity.java
>非常简单,只需使用布局调用setContentView.
main.xml中
>包含一些片段,包括其中包含AppWidgetHost的片段.
CodeRedWidgetHostFragment.java
> onCreateView
创建AppWidgetHost&的实例AppWidgetManager
使用我存储在首选项中的窗口小部件ID创建和设置主机视图
> onStart()
appWidgetHost.startListening()
> onStop()
appWidgetHost.stopListening()
当我得到AppWidgetHost和AppWidgetManager的实例时,我正在使用getActivity()来获取Fragments托管活动.我想知道这是不是我的小部件没有更新的原因？
有些小部件实际上会更新,例如模拟时钟,但是,Youtube小部件不会自动循环显示视频缩略图.
我应该提一下,我在AppWidgetHost中选择了我想要的小部件,在另一个活动中将所选小部件的id存储在SharedPreferences中.
这是我的Fragment类的代码.
package com.brockoli.android.codered.widgethost;
import android.app.Fragment;
import android.appwidget.AppWidgetHost;
import android.appwidget.AppWidgetHostView;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProviderInfo;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.brockoli.android.codered.R;
public class CodeRedWidgetHostFragment extends Fragment {
private static final String TAG = CodeRedWidgetHostFragment.class.getSimpleName();
public static final String CODERED_WIDGET_ID = "CODERED_WIDGET_ID";
private SharedPreferences mSharedPrefsWidgets;
AppWidgetManager mAppWidgetManager;
AppWidgetHost mAppWidgetHost;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View parentView = inflater.inflate(R.layout.widget_host,null);
mSharedPrefsWidgets = getActivity().getSharedPreferences("codered_widgets",0);
mAppWidgetManager = AppWidgetManager.getInstance(getActivity());
mAppWidgetHost = new AppWidgetHost(getActivity(),R.id.APPWIDGET_HOST_ID);
createWidget(parentView);
return parentView;
}
@Override
public void onStart() {
super.onStart();
mAppWidgetHost.startListening();
}
@Override
public void onStop() {
super.onStop();
mAppWidgetHost.stopListening();
}
@Override
public void onResume() {
super.onResume();
createWidget(getView());
}
/**
* Creates the widget and adds to our view layout.
*/
public void createWidget(View v) {
if (v != null) {
// Remove any existing widgets from the widget host
((ViewGroup) v).removeAllViews();
int appWidgetId = mSharedPrefsWidgets.getInt(CODERED_WIDGET_ID,-1);
if (appWidgetId > -1) {
AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
AppWidgetHostView hostView = mAppWidgetHost.createView(getActivity(),appWidgetId,appWidgetInfo);
hostView.setAppWidget(appWidgetId,appWidgetInfo);
((ViewGroup) v).addView(hostView);
Log.i(TAG,"The widget size is: " + appWidgetInfo.minWidth + "*" + appWidgetInfo.minHeight);
}
}
}
}
解决方法
基于Clemens的回答,AppWidgetHost应该在应用程序的整个生命周期中保持活跃状态.这意味着无论Activity如何,您都应该可以轻松访问应用程序的AppWidgetHost和AppWidgetManager实例.
public class YourApp extends Application {
private static final int HARDCODED_ID = 0;
private static AppWidgetHost appWidgetHost;
private static AppWidgetManager appWidgetManager;
@Override
public void onCreate() {
super.onCreate();
appWidgetManager = AppWidgetManager.getInstance(getApplicationContext());
appWidgetHost = new AppWidgetHost(getApplicationContext(),HARDCODED_ID);
appWidgetHost.startListening();
}
@Override
public void onTerminate() {
super.onTerminate();
appWidgetHost.stopListening();
appWidgetHost = null;
}
public static AppWidgetHost getAppWidgetHost() { return appWidgetHost; }
public static AppWidgetManager getAppWidgetManager() { return appWidgetManager; }
}
我当前的实现已正确更新.测试了许多需要“实时”更新的应用,例如我的音乐播放器小部件.
请记住,应用程序上下文用于确保AppWidgetHost和AppWidgetManager的上下文始终可用.
此外,在其小部件中使用AppCompat库的较新小部件目前在com.android.support:appcompat-v7:23.1.1依赖项中存在错误.为避免这种情况,请在调用以下内容时使用应用程
AppWidgetHostView hostView = YourApp.getAppWidgetHost()
.createView(context.getApplicationContexxt(),info);
