如何在一定时间后隐藏自定义加载图标 (android)？

Question

我目前正在实现自己的自定义进度对话框，一旦结果出现 in/error，我就会在其中调用显示和隐藏。但是，我想实现一个自定义方法，说明如果进度对话框在 10 秒后无论如何都没有隐藏，请将其隐藏并发出警报。

这是我的自定义进度对话框，我的方法有效但不完全。

public class CustomProgressDialog extends ProgressDialog {

    private AnimationDrawable animation;
    private CountDownTimer cTimer = null;
    private Context mContext;
    public CustomProgressDialog(Context context) {
        super(context);
        mContext = context;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.custom_progress_dialog);


        ImageView la = (ImageView) findViewById(R.id.animation);
        la.setBackgroundResource(R.drawable.custom_progress_dialog_animation);
        animation = (AnimationDrawable) la.getBackground();

    }

    @Override
    public void show() {
        super.show();
        animation.start();
        startTimer();
    }

    @Override
    public void dismiss() {
        super.dismiss();
        animation.stop();
        if(cTimer != null) {
            cTimer.cancel();
        }
    }

    //timer added just in case progress dialog does not stop on its own
    private void startTimer() {
        cTimer = new CountDownTimer(10000, 1000) {

            public void onTick(long millisUntilFinished) {
            }

            public void onFinish() {
                dismiss();
                AlertDialogManager alert = new AlertDialogManager();
                alert.showAlertDialog(mContext, mContext.getString(R.string.loadingErr), mContext.getString(R.string.loadingErrTxt), 3);
            }
        }.start();
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        animation.stop();
        cTimer.cancel();
    }
}

这就是我在 activity/fragment 中实现它的方式：

private void showProgressDialog() {
        customProgressDialog = new CustomProgressDialog(this);
        customProgressDialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
        customProgressDialog.show();
        //so it cannot be closed by user first one lets back button cancel it
        //customProgressDialog.setCanceledOnTouchOutside(false);
        customProgressDialog.setCancelable(false);

    }

    private void hideProgressDialog() {
        if(customProgressDialog != null) {

           //customProgressDialog.hide();
        }
    }

更新：这是我试过的第二个选项，它仍然没有阻止弹出警报，这让我觉得即使在取消时计时器仍在继续。

这是activity:

private void autoProgressShutdown() {
        Runnable progressRunnable = new Runnable() {

            @Override
            public void run() {
                customProgressDialog.cancel();
                callAlert();
               }
        };

        Handler pdCanceller = new Handler();
        pdCanceller.postDelayed(progressRunnable, 10000);
    }

    private void callAlert() {
        AlertDialogManager alert = new AlertDialogManager();
        alert.showAlertDialog(this, getString(R.string.loadingErr), getString(R.string.loadingErrTxt), 3);

    }


    private void showProgressDialog() {
        customProgressDialog = new CustomProgressDialog(this);
        customProgressDialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
        customProgressDialog.show();
        //so it cannot be closed by user first one lets back button cancel it
        //customProgressDialog.setCanceledOnTouchOutside(false);
        customProgressDialog.setCancelable(false);
        autoProgressShutdown();

    }

    private void hideProgressDialog() {
        customProgressDialog.cancel();
        if(customProgressDialog != null) {

           customProgressDialog.hide();
        }
    }

在自定义对话框中编辑文件以删除所有计时器内容并添加：

 @Override
    public void setOnCancelListener(OnCancelListener listener) {
        super.setOnCancelListener(listener);
        dismiss();
    }

可能的问题： -不确定是否存在内存泄漏问题，因为我没有销毁它

明确的问题： - 如果进度对话框被隐藏，警告在 10 秒后仍然弹出，这意味着取消没有被调用 -此外，如果我切换屏幕不确定取消是否足以破坏计时器

Answer 1

您可以使用 Handler#postDelayed 稍后在给定线程上执行某些操作，您可以使用 Handler#removeCallbacksAndMessages 取消挂起的任务。如果你用 null 调用它，如果你有一些你需要在发布的任务中阻止的东西，它只会取消处理程序上的任何挂起。

这是您的对话，但会自行终止：

class SuicideDialog extends Dialog{
  private Handler mAutoTerminationHandler;

  @Override
  public void onShow(){
    mAutoTerminationHandler = new Handler();
  }

  @Override
  public void show(){
    super.show();
    mAutoTerminationHandler.postDelayed(new Runnable(){
      dismiss();
    }, 666L);
  }

  @Override
  public void dismiss(){
    mAutoTerminationHandler.removeCallbacksAndMessages(null);
    super.dismiss();
  }
}

或者，您可以将生命周期监听放入它自己的 class:

class ShownTaskListener implements OnShowListener, OnDismissListener {
  private Handler mHandler;

  @Override
  public ShownTaskListener(Handler handler, Runnable showTask){
    mHandler = handler;
    mShowTask = showTask;
  }

  // from OnShowListener
  @Override
  public void onShow(){
    mHandler.postDelayed(mShowTask, 666L);
  }

  // from OnDismissListener
  @Override
  public void onDismiss(){
    // get rid of all pending actions in the Handler
    mHandler.removeCallbacksAndMessages(null);
  }
}

然后，您可以通过将此侦听器附加到 Dialog#setOnShowListener 和 Dialog#setOnDismissListener.

来使用它自行关闭任何 Dialog

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