Android 对话框自行消失

问题描述

我正在使用以下代码来创建自己的对话框:

I'm using the following code to create my own dialog:

public void ShowMessageDialog(String str){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage(str);
    builder.setCancelable(false);
    builder.setNeutralButton("Ok", new DialogInterface.OnClickListener() {          
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });
    AlertDialog alert = builder.create();
    alert.show();
}

它工作正常，但在此函数中使用时，对话框会自行消失:

It works fine but it appears the Dialog disappears on it's own when used inside this function:

public void test(String str){
    ShowMessageDialog("About to start new activity");
    Intent intent = new Intent(this,PageViewer.class);
    startActivity(intent);
}

似乎新活动已创建并且显然摆脱了对话框.但为什么?活动不应该在打开新活动之前停止吗?

It seems that the new activity is created and obviously gets rid of the dialog. But why? Shouldn't the activity stop before opening the new one?

谢谢！

推荐答案

即将触发的 Intent 不会等待您的对话框被取消.因此，在显示对话框后，新的活动就开始了.你可以像这样完成你想要的:

Intent which is about to fire doesn't wait for your dialog to be canceled. So, right after dialog is shown, new Activity is started. You could accomplish what you want like this:

public void ShowMessageDialog(String str){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage(str);
    builder.setCancelable(false);
    builder.setNeutralButton("Ok", new DialogInterface.OnClickListener() {          
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
            Intent intent = new Intent(this,PageViewer.class);
            startActivity(intent);
        }
    });
    AlertDialog alert = builder.create();
    alert.show();
}

public void test(String str){
    ShowMessageDialog("About to start new activity");
}

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