这是AlertDialog

Question

我使用带有两个微调器的AlertDialog，该应用程序本身非常快，但是当我启动此Dialog时，对话框完成后，应用程序速度会降低。

其中一个Spinners确实很“沉重”，它包含60个元素，其中包括一张图片和一个TextView。图片（ImageView）很小，但是原始图片是512x512 PNG 12,54kB（这是大图片吗？）。

直接初始化一个ArralyList（用于小型微调器），在应用程序启动时初始化一个小的。

这是AlertDialog

public class dialog_CardWithdrawRequest extends AppCompatDialogFragment {
private static final String TAG = "dialog_CardWithdrawRequ";

private ArrayList<obj_PrintState> printStatesList;
private Spinner sp_DialogCardWithdrawRequest_Printer;

private Spinner sp_DialogCardWithdrawRequest_Country;
private sendChoosenCountryAndPrintState listener;

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    try {
        listener = (dialog_CardWithdrawRequest.sendChoosenCountryAndPrintState) context;
    } catch (ClassCastException e) {
        throw new ClassCastException(context.toString() +
                " must implement sendChoosenCountryAndPrintState listener");
    }
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    initArrays();
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme);
    LayoutInflater inflater = getActivity().getLayoutInflater();
    View view = inflater.inflate(R.layout.dialog_cardwithdrawrequest, null);

    final int Driver;
    final int iCurrentDriverPosition;
    Bundle receivingBundle = this.getArguments();
    if(receivingBundle != null){
        Driver = receivingBundle.getInt("Driver");
        iCurrentDriverPosition = receivingBundle.getInt("CurrentCountryPosition");
    }else{
        Driver = INT_DEFAULT_VALUE;
        iCurrentDriverPosition =0;
    }

    builder.setView(view)
            .setTitle(R.string.dialog_CardWithdrawRequest_Title);

    builder.setNegativeButton(R.string.Cancle, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {

        }
    });

    builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            obj_Country selectedCountry = (obj_Country) sp_DialogCardWithdrawRequest_Country.getSelectedItem();
            String sSelectedCountry = selectedCountry.getsHexCountryCode();

            obj_PrintState selectedPrintState = (obj_PrintState) sp_DialogCardWithdrawRequest_Printer.getSelectedItem();
            String sSelectedPrintRequest = selectedPrintState.getsPrinterRequestHex();

            listener.choosenCountryAndPrintState(sSelectedCountry, sSelectedPrintRequest, Driver);

        }
    });
    sp_DialogCardWithdrawRequest_Country = view.findViewById(R.id.sp_DialogCardWithdrawRequest_Country);
    sp_DialogCardWithdrawRequest_Printer = view.findViewById(R.id.sp_DialogCardWithdrawRequest_Printer);

    adapter_Spinner_Country adapterCountry = new adapter_Spinner_Country(getContext(), objCountryList);
    adapter_Spinner_Printer adapterPrinter = new adapter_Spinner_Printer(getContext(), printStatesList);

    sp_DialogCardWithdrawRequest_Country.setAdapter(adapterCountry);
    sp_DialogCardWithdrawRequest_Printer.setAdapter(adapterPrinter);

    sp_DialogCardWithdrawRequest_Country.setSelection(iCurrentDriverPosition);
    return builder.create();
}

    private void initArrays(){
        printStatesList = new ArrayList<>();
        printStatesList.add(new obj_PrintState(PRINTREQUEST_NONE, getText(R.string.dialog_CardWithdrawRequest_PrintRequest_None).toString()));
        printStatesList.add(new obj_PrintState(PRINTREQUEST_UTC, getText(R.string.dialog_CardWithdrawRequest_PrintRequest_UTC).toString()));
        printStatesList.add(new obj_PrintState(PRINTREQUEST_LOCAL, getText(R.string.dialog_CardWithdrawRequest_PrintRequest_Local).toString()));
    }

public interface sendChoosenCountryAndPrintState{
    void choosenCountryAndPrintState(String sSelectedCountry, String sSelectedPrintRequest, int Driver);
}

}

这是来自mainActivity的呼叫

helperThread = new HandlerThread("HelperThread");
    helperThread.start();
    Handler helperHandler = new Handler(helperThread.getLooper());

   helperHandler.post(new Runnable() {
        @Override
        public void run() {
            dialog_CardWithdrawRequest dialog_cardWithdrawRequest = new dialog_CardWithdrawRequest();
            Bundle information = new Bundle();
            information.putInt("Driver", iDriver);
            information.putInt("CurrentCountryPosition", finalIPosition);
            dialog_cardWithdrawRequest.setArguments(information);
            dialog_cardWithdrawRequest.show(getSupportFragmentManager(),"CardWithdrawRequest");
        }
   });

如您所见，我已经尝试过将这一“艰苦的工作”发布到另一个线程上，但是我认为AlertDialog始终在UI线程中运行，我不知道。

我也尝试使用：

runOnUiThread(new Runnable() {
        @Override
        public void run() {

        }
    });

Answer 1

... 512x512 PNG 12,54kB (is this to large?) ...是的。

考虑到解压缩的原始位图是x * y * 4个字节（R，G，B和A分量，每个分量加权1个完整字节）。
因此，您的每个图像在内存中的重量为1 MB。

顺便说一句，不需要使用ImageView：只需将图像设置为TextView中的可绘制复合图像，即可发挥一些性能。

这是一个有趣的链接：
https://antonioleiva.com/textview_power_drawables/

跳过844帧！使用Spinners的简单AlertDialog导致MainThread中的工作过多

这是AlertDialog

这是来自mainActivity的呼叫

1 个答案: