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我正在尝试在处理对后端的异步调用并更新传递给它的 onPostExecute() 的活动的 gui 的类（不是活动）中添加一个 AlertDialog。传递给此类的活动确实实现了 Theme.AppCompat 的后代，但该类本身没有（因为它不是活动），但我收到以下错误：

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

具有异步任务的类如下所示：

public class QueryUserTask extends AsyncTask<Void, Void, Seller>{
private Context mainContext;
private View mainView;
int barcode;

public QueryUserTask(Context context, View rootView, int sellerID) {
    this.mainContext = context;
    this.mainView = rootView;
    this.barcode = sellerID;
}

protected Seller doInBackground(Void... unused) {
    Seller seller = null;
    try {
        ApiRequester API = new ApiRequester();
        seller = API.getSellerFromApi(barcode);

    } catch (NoSuchAlgorithmException e) {
        Log.d("Seller API Error", e.getMessage(), e);
        Toast APIError = Toast.makeText(mainContext,R.string.NoSuchAlgorithmException, Toast.LENGTH_LONG);
        APIError.show();
    }
    return seller;
}

protected void onPostExecute(Seller seller) {
    // Do something with the result.
    TextView sellerNameTextView = (TextView) mainView.findViewById(R.id.sellername);
    TextView sellerIDTextView = (TextView) mainView.findViewById(R.id.sellerid);
    TextView newspaperCountTextView = (TextView) mainView.findViewById(R.id.newsCount);
    TextView calenderCountTextView = (TextView) mainView.findViewById(R.id.calCount);

    sellerNameTextView.setText(String.valueOf(seller.getName()));
    // sellerIDTextView.setText(String.valueOf());
    newspaperCountTextView.setText(String.valueOf(seller.getNewspapers()));
    calenderCountTextView.setText(String.valueOf(seller.getCalendars()));

    ImageView sellerImage = (ImageView)mainView.findViewById(R.id.imageView2);
    sellerImage.setImageBitmap(seller.getImage());

    String text = seller.getText();
    Log.d("text", text);
    if(!text.equals("")){

        AlertDialog.Builder builder = new AlertDialog.Builder(mainContext);
        builder.setMessage("test")
                .setTitle("test");
        AlertDialog dialog = builder.create();
        dialog.show();

传递给类的上下文和 rootview 来自我的 HomeActivity。清单文件中的 homeactivity 如下所示：

    <activity
        android:name=".HomeActivity"
        android:parentActivityName=".BarcodeCaptureActivity"
        android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
    <activity

非常感谢提前

4

1 回答 1

1

更改您的代码以传递Activity调用您的代码AsyncTask：

Activity mActivity;

public QueryUserTask(Activity activity, View rootView, int sellerID) {
    this.mActivity= activity;
    this.mainView = rootView;
    this.barcode = sellerID;
}

现在使用Activity这样的：

AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
于 2018-05-31T16:18:59.790 回答