Android 需要数据获取的小部件仅显示正在加载

Question

我正在尝试通过 android 小部件选择器在视图中添加一个小部件。一个简单的模拟时钟小部件显示正确，但必须获取数据的小部件仅显示加载而不显示数据，如下面的屏幕截图所示。

我的小部件创建代码是从 Hosting Android Widget 完成的。

我的代码是：

class MainActivity : AppCompatActivity() {

private lateinit var mAppWidgetManager: AppWidgetManager
lateinit var mAppWidgetHost: AppWidgetHost
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    mAppWidgetManager = AppWidgetManager.getInstance(this)
    mAppWidgetHost = AppWidgetHost(this, APPWIDGET_HOST_ID)
    add_widget.setOnClickListener {
        selectWidget()
    }
}

fun selectWidget() {
    val appWidgetId = mAppWidgetHost.allocateAppWidgetId()
    val pickIntent = Intent(AppWidgetManager.ACTION_APPWIDGET_PICK)
    pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    addEmptyData(pickIntent)
    startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET)
}

private fun addEmptyData(pickIntent: Intent) {
    val customInfo = arrayListOf<Parcelable>()
    pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo)
    val customExtras = arrayListOf<Parcelable>()
    pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_EXTRAS, customExtras)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (resultCode == RESULT_OK) {
        if (requestCode == REQUEST_PICK_APPWIDGET) {
            configureWidget(data)
        } else if (requestCode == REQUEST_CREATE_APPWIDGET) {
            createWidget(data)
        }
    } else if (resultCode == RESULT_CANCELED && data != null) {
        val appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1)
        if (appWidgetId != -1) {
            mAppWidgetHost.deleteAppWidgetId(appWidgetId)
        }
    }
}

private fun configureWidget(data: Intent?) {
    val extras = data?.extras ?: return
    val appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1)
    val appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId)
    if (appWidgetInfo.configure != null) {
        val intent = Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE)
        intent.component = appWidgetInfo.configure
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId)
        startActivityForResult(intent, REQUEST_CREATE_APPWIDGET)
    } else {
        createWidget(data)
    }
}


private fun createWidget(data: Intent?) {
    val extras = data?.extras ?: return;
    val appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
    val appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
    val hostView = mAppWidgetHost.createView(this, appWidgetId, appWidgetInfo);
    remove_widget.setOnClickListener {
        removeWidget(hostView)
    }
    hostView.setAppWidget(appWidgetId, appWidgetInfo);
    widgetLayout.addView(hostView);
}

override fun onStart() {
    super.onStart()
    mAppWidgetHost.startListening()
}

override fun onStop() {
    super.onStop()
    mAppWidgetHost.stopListening()
}

private fun removeWidget(hostView: AppWidgetHostView) {
    mAppWidgetHost.deleteAppWidgetId(hostView.appWidgetId)
    widgetLayout.removeView(hostView);
}

companion object {
    const val REQUEST_PICK_APPWIDGET = 9
    const val REQUEST_REFRESH_APPWIDGET = 10
    const val APPWIDGET_HOST_ID = 442
    const val REQUEST_CREATE_APPWIDGET = 5
}
}

这里，remove_widget和add_widget是按钮，widgetLayout是线性布局，用来添加widget。

编辑：添加 gmail 小部件后，日志中显示以下错误。

2019-11-28 14:18:33.652 15363-15363/com.example.testapplication W/AppWidgetHostView: Error inflating RemoteViews : android.widget.RemoteViews$ActionException: android.widget.RemoteViews$ActionException: view: androidx.appcompat.widget.AppCompatImageView can't use method with RemoteViews: setImageResource(int)

注意：从另一个启动器，小部件按预期呈现，而不是从我的代码。另外，我用 applicationContext 改变了我的上下文。但是，它产生相同的结果。

Answer 1

如果您使用的是 androidX AppCompactActivity，请尝试使用普通 activity 看看是否可行。

import android.app.Activity;


//other codes....

public class MainActivity extends Activity {

    // other codes...

}

Answer 2

** RemoteViews 仅限于支持以下布局：

AdapterViewFlipper
框架布局
网格布局
网格视图
线性布局
列表视图
相对布局
堆栈视图
ViewFlipper

** 以及以下小部件：

模拟时钟
按钮
时计
图片按钮
ImageView
进度条
文本时钟
TextView

** 不支持这些类的后代。

您应该检查您的布局！

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