创建App Widget时，
model.user = { firstName: 'John', lastName: 'Smith' }方法将不会被调用（系统在启动配置活动时不会发送ACTION_APPWIDGET_UPDATE广播）。首次创建App Widget时，配置Activity负责从AppWidgetManager请求更新。
然后在this page中显示了“从配置活动中更新App Widget”的示例。
所以我根据其指示（以及其他一些资源的帮助）创建了一个项目但是onUpdate()方法（以及onUpdate()方法）不会从配置活动。
onReceive(...)真实结果（logcat窗口）：
1-首先（16:59:31）：插入小部件后（问题在这里！）：
XXXX:: ConfigureActivity onCreate(...) method: Started.
Expected occurring FIRST: when the widget has been inserted.
XXXX:: ConfigureActivity: Finished.
Expected occurring LAST: when OK button has been clicked.
XXXX:: AppWidgetProvider onUpdate(...) method: Started.
Expected occurring LAST: when OK button has been clicked.
2- First（16:59:31）：插入小部件时：
12-21 16:59:31.688 I/XXXX: AppWidgetProvider onUpdate(...) method: Started.
Expected occurring LAST: when OK button has been clicked.
3-最后（17:00:52）：单击确定按钮时：
12-21 16:59:31.743 I/XXXX: ConfigureActivity onCreate(...) method: Started.
Expected occurring FIRST: when the widget has been inserted.
有关实际结果的详细信息，请参阅结尾。
这是我的来源：
12-21 17:00:52.063 I/XXXX: ConfigureActivity: Finished.
Expected occurring LAST: when OK button has been clicked.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp">
<application>
<activity
android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="ExampleAppWidgetProvider">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/example_appwidget_info" />
</receiver>
<activity android:name=".ExampleAppWidgetConfigure">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
</intent-filter>
</activity>
</application>
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:configure="com.example.myapp.ExampleAppWidgetConfigure"
android:initialLayout="@layout/example_appwidget"
android:minHeight="40dp"
android:minWidth="40dp"
android:previewImage="@drawable/widget_preview"
android:updatePeriodMillis="86400000">
</appwidget-provider>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Click Me"/>
</RelativeLayout>
...
public class ExampleAppWidgetProvider extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
Log.i("XXXX", "AppWidgetProvider onUpdate(...) method: Started.\n" +
"Expected occurring LAST: when OK button has been clicked.");
final int N = appWidgetIds.length;
// Perform this loop procedure for each App Widget that belongs to this provider
for (int i = 0; i < N; i++) {
int appWidgetId = appWidgetIds[i];
// Create an Intent to launch ExampleActivity
Intent intent = new Intent(context, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
// Get the layout for the App Widget and attach an on-click listener
// to the button
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.example_appwidget);
views.setOnClickPendingIntent(R.id.button, pendingIntent);
// Tell the AppWidgetManager to perform an update on the current app widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
@Override
public void onReceive(Context context, Intent intent) {
Log.i("XXX", "AppWidgetProvider onReceive(...) method: Started: " + intent.getAction());
super.onReceive(context, intent);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/ok_btn"
android:layout_marginTop="30dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="OK" />
</LinearLayout>
问题出在哪里？或者我错误地预料到了？
额外信息：
更准确实际结果：
...
public class ExampleAppWidgetConfigure extends Activity {
private int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i("XXXX", "ConfigureActivity onCreate(...) method: Started.\n" +
"Expected occurring FIRST: when the widget has been inserted.");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_widget_configuration);
final Button OK_btn = (Button) findViewById(R.id.ok_btn);
OK_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Context context = getApplicationContext();
// 1. First, get the App Widget ID from the Intent that launched the Activity:
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null) {
mAppWidgetId = extras.getInt(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
// 2. Perform your App Widget configuration:
/* Nothing. */
// 3. When the configuration is complete, get an instance of the AppWidgetManager
// by calling getInstance(Context):
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
// 4. Update the App Widget with a RemoteViews layout by calling
// updateAppWidget(int, RemoteViews):
RemoteViews views = new RemoteViews(context.getPackageName(),
R.layout.example_appwidget);
appWidgetManager.updateAppWidget(mAppWidgetId, views);
// 5. Finally, create the return Intent, set it with the Activity result,
// and finish the Activity:
Intent resultValue = new Intent();
resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
setResult(RESULT_OK, resultValue);
Log.i("XXXX", "ConfigureActivity: Finished.\n" +
"Expected occurring LAST: when OK button has been clicked.");
finish();
}
});
}
}
答案 0 :(得分：0)
尝试将此代码移到onClickListener之外。另外，验证mAppWidgetId不等于AppWidgetManager.INVALID_APPWIDGET_ID。
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null) {
mAppWidgetId = extras.getInt(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
除非...假设您的配置活动实际上是在您添加小部件时打开...并且您的代码确实位于com.example.myapp包中...我不确定发生了什么。也许它与RemoteViews有关。而不是在OnClickListener中使用AppWidgetManager，只需像这样直接向接收者发送一个意图。
Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE, null, this, ExampleAppWidgetProvider.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] {mAppWidgetId});
sendBroadcast(intent);
原始回答：
这与Guide非常相似。唯一有点奇怪的就是这一行
final Context context = getApplicationContext();
尝试删除该行并改为执行此操作
...
final Button OK_btn = (Button) findViewById(R.id.ok_btn);
final Context context = this;
OK_btn.setOnClickListener(new View.OnClickListener() {
...