Question

我正在尝试将Wson http请求与Widget一起使用，但在控制台上只有一条消息没有任何反应

D / dalvikvm：GC_CONCURRENT释放366K，5％免费10713K / 11207K，暂停5ms + 30ms V / AsyncHttpRH：进展183从121（151％）

见下面的代码

public class MyWidget extends AppWidgetProvider {

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    final int count = appWidgetIds.length;

    for (int i = 0; i < count; i++) {
        int widgetId = appWidgetIds[i];

        String number = getCurrentPrice();
        RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
                R.layout.bitcoin_widget);
        remoteViews.setTextViewText(R.id.textView, number);

        Intent intent = new Intent(context, MyWidget.class);
        intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
                0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.actionButton, pendingIntent);
        appWidgetManager.updateAppWidget(widgetId, remoteViews);
    }
}

String value = "0.00";
private String getCurrentPrice() {
    value = "0.00";
    String url = "https://www.mywebservice.net/stock/";
    AsyncHttpClient client = new AsyncHttpClient();
    client.get(url, new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            try {
                String data= new String(responseBody, "UTF-8");
                JSONObject res = new JSONObject(data);
                JSONObject obj = res.getJSONObject("values");
                String last = obj.getString("stock");
                value = last;
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
            Log.d("STK", error.getMessage());
        }
    });
    return String.format("USD %.2f",Double.parseDouble(value));
}

Answer 1

return String.format（“USD％.2f”，Double.parseDouble（value））;

因为client.get()是异步调用，所以它会立即执行并转到return语句。这就是为什么你看不到任何变化，因为value仍为0.将回报放在onSuccess()内。您还需要从onFailure()返回一个值。

修改

由于onSuccess无效，您需要传入一个将在解析后调用的回调。

interface ResponseCallback { void success(String value); }

然后，

getCurrentPrice(new ResponseCallback() { @Override void success(String value) { remoteViews.setTextViewText(R.id.textView, value); } }

getCurrentPrice内部（不返回值） -

private void getCurrentPrice(ResponseCallback callback) { ... client.get(url, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { try { ... String last = obj.getString("stock"); callback.success(last); } catch(...) }

如何在Android Widget中使用loopj get

1 个答案: