Question

我正在创建一个应用程序，目前我的要求是避免用户在主屏幕中创建多个App Widgets。我是这样尝试的

@Override
    public void onReceive(Context context, Intent intent) {
        switch (intent.getAction()){
            case AppWidgetManager.ACTION_APPWIDGET_PICK:
                Util.logD(TAG, "---APP WIDGET PICKED----");
                break;
            case AppWidgetManager.ACTION_APPWIDGET_DELETED:
                Util.logD(TAG, "---APP WIDGET DELETED----");

                break;
            case AppWidgetManager.ACTION_APPWIDGET_BIND:
                Util.logD(TAG, "---APP WIDGET BINDED----");
                break;
            case AppWidgetManager.ACTION_APPWIDGET_CONFIGURE:
                Util.logD(TAG, "---APP WIDGET CONFIGURED----");
                break;
            case AppWidgetManager.ACTION_APPWIDGET_ENABLED:
                Util.logD(TAG, "---APP WIDGET ENABLED----");
                break;
            case AppWidgetManager.ACTION_APPWIDGET_DISABLED:
                Util.logD(TAG, "---APP WIDGET DISABLED----");
                break;

            case AppWidgetManager.ACTION_APPWIDGET_UPDATE:
                Util.logD(TAG, "---APP WIDGET UPDATED----");
                int ids[] =intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
                Util.logD(TAG, "---TOTAL APP WIDGET----" + ids.length);
                Util.logD(TAG, "---WIDGET VALUE----" + ids[0]);
                    int [] id = {ids[0]};
                   RemoteViews views = new RemoteViews(MainApplication.getsApplicationContext().getPackageName(), R.layout.widget_layout);
                    AppWidgetManager manger = (AppWidgetManager) MainApplication.getsApplicationContext().getSystemService(Context.APPWIDGET_SERVICE);
                Util.logD(TAG, "---MANAGER SERVICIE----" + manger);

                 manger.updateAppWidget(id, views);
break;
        }
    }

但控制台正在打印

--TOTAL APP WIDGET---1
--WIDGET VALUE--43

您可以在主屏幕中找到多个应用小部件。请帮帮我，谢谢！

Answer 1

您必须使用＆＃34;应用小工具配置活动＆＃34;如下所述：

http://developer.android.com/guide/topics/appwidgets/index.html

然后弄清楚此活动中已有多少小部件，如果您发现已存在小部件，则将结果保留为setResult(RESULT_CANCELED);。

示例：

在你的appwidget xml：

中

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    ...
    android:configure="com.example.AppWidgetConfigurationActivity" 
    ...
</appwidget-provider>

＆＃34;应用小工具配置活动＆＃34;：

public class AppWidgetConfigurationActivity extends Activity {
    int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setResult(RESULT_CANCELED);
        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        if (extras != null) {
            mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
        }
        if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) {
            finish();
        }

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
        int[] appWidgetIDs = appWidgetManager.getAppWidgetIds(new ComponentName(this, YourAppWidgetProvider.class ));

        if (appWidgetIDs.length <= 1) {
            Intent resultValue = new Intent();
            resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
            setResult(RESULT_OK, resultValue);
        } 
        finish();
    }
}

Answer 2

通过接近上述解决方案，AppWidgetConfigurationActivity，

稍作修改

public class AppWidgetConfigurationActivity extends ActionBarActivity {
    int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
    private static final String TAG = AppWidgetConfigurationActivity.class.getSimpleName();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Util.logD(TAG, "---MYAPPWIDGET---");
//        setResult(RESULT_CANCELED);

        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        if (extras != null) {
            mAppWidgetId = extras.getInt(
                    AppWidgetManager.EXTRA_APPWIDGET_ID,
                    AppWidgetManager.INVALID_APPWIDGET_ID);
        }

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
        ComponentName name = new ComponentName(MainApplication.getsApplicationContext(), MyWidgetProvider.class);
        int[] appWidgetIDs = appWidgetManager.getAppWidgetIds(name);
        Util.logD(TAG, "---INSTALLED WIDGETS---" + appWidgetIDs.length);
        if (appWidgetIDs.length == 1) {
            RemoteViews views = new RemoteViews(MainApplication.getsApplicationContext().getPackageName(), R.layout.widget_layout);
            appWidgetManager.updateAppWidget(mAppWidgetId, views);
            Intent resultValue = new Intent();
            resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
            setResult(RESULT_OK, resultValue);
        }else{
            /*Remove rest of the widgets using AppWidgetHost*/
            int hostID = 22; // Itc oould be any value
                AppWidgetHost host = new AppWidgetHost(MainApplication.getsApplicationContext(), hostID);
                host.deleteAppWidgetId(appWidgetIDs[1]);
                AppWidgetProviderInfo info = appWidgetManager.getAppWidgetInfo(appWidgetIDs[1]);

            Util.showToast("Widget Already in Home Screen");
        }
        finish();
    }
}

它将限制用户在主屏幕中创建多个App Widget。

如何避免在主屏幕中创建多个小部件？

2 个答案: