Android 在设置时间后隐藏对话框，就像自定义时间间隔 toast

Question

我正在尝试在屏幕上显示一些文本一段时间，类似于 toast ，但能够指定它在屏幕上的确切时间。我认为警告对话框可能适用于此，但我似乎无法弄清楚如何自动关闭该对话框。

您能否建议一种 toast 通知的替代方案，我可以在其中指定显示的确切时间？

谢谢!

static DialogInterface dialog = null;
public void toast(String text, int duration) {

    final AlertDialog.Builder builder = new AlertDialog.Builder(gameplay);

    LayoutInflater inflater = (LayoutInflater) gameplay.getSystemService(gameplay.LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.tutorial, (ViewGroup)gameplay.findViewById(R.id.layout_root));
    ((TextView)layout.findViewById(R.id.message)).setText(text);

    builder
        .setView(layout);


    builder.show();

    if (dialog!=null){
        dialog.cancel();
        dialog.dismiss();
    }

    dialog = builder.create();


    Handler handler = null;
    handler = new Handler(); 
    handler.postDelayed(new Runnable(){ 
         public void run(){
             dialog.cancel();
             dialog.dismiss();
         }
    }, 500);


}

Answer 1

您只需要计时调用Dialog#dismiss()；对于您的问题 Handler 类就足够了(+1 到 Javanator :))。

仅供引用，还有其他类即 AlarmManager , Timer & TimerTask这有助于计时代码的运行。

编辑:

将您的代码更改为:

static DialogInterface dialog = null;
public void toast(String text, int duration) {

    final AlertDialog.Builder builder = new AlertDialog.Builder(gameplay);

    LayoutInflater inflater = (LayoutInflater) gameplay.getSystemService(gameplay.LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.tutorial, (ViewGroup)gameplay.findViewById(R.id.layout_root));
    ((TextView)layout.findViewById(R.id.message)).setText(text);

    builder
        .setView(layout);


    //builder.show(); commented this line
// I don't understand the purpose of this if block, anyways
// let it remain as is at the moment
    if (dialog!=null){
        dialog.cancel();
        dialog.dismiss();
    }

    dialog = builder.create().show();


    Handler handler = null;
    handler = new Handler(); 
    handler.postDelayed(new Runnable(){ 
         public void run(){
             dialog.cancel();
             dialog.dismiss();
         }
    }, 500);


}