AppWidgetHost不更新小部件

Question

我可以AppWidgetHost在里面使用Fragment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和AppWidgetManager的实例
  创建并设置我的主机视图,其中包含我存储在首选项中的小部件ID

• 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);
        }   
    }
}
}

Answer 1

如果您的某些小部件确实更新，我相信您的 getActivity() 可能是问题所在。

尝试在片段中创建引用，例如：

private Activity activity;

并将其设置在 onAttach() 中

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    this.activity = activity; 
}

这样，它应该始终指向您当前的托管活动。