按下后退键的对话框

Question

当我按下设备对话框的 backkey 时，我的游戏有一个 alertDialog。如果我按 "Quit" 我的游戏结束，如果我按 "Cancle" 然后吐司出现 3 秒，3 秒后我的游戏再次开始。 现在的问题是，当我第一次按下设备的 backkey 时，会出现对话框并且我执行某些功能时它工作正常但是如果我再次按下 backkey 没有 "Cancle" 或 "Quit" 游戏然后我的游戏不会再次恢复，直到我按下 "No" 按钮。

我想要的是，如果我按下 backkey，然后出现对话框，如果我再次按下 backkey，我的游戏将再次恢复，而不会再次显示对话框，谢谢。

这是我的警报对话框代码：

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK) {

         //  GamePanel.thread.setStoped(true);
            GamePanel.thread.setRunning(false);

// in the next line of code we also style the dialog through xml which i put in styles


            AlertDialog alertDialog = new AlertDialog.Builder(this,R.style.myBackgroundStyle).create();
            alertDialog.setTitle("Exit Alert");
            alertDialog.setMessage("Do you really want to exit the Game?");
            alertDialog.setButton("Quit", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    //Best way is firstly use finish() and after that use System.exit(0) to clear static variables. It will give you some free space.
                    // A lot of applications leave working processes and variables what makes me angry. After 30 minutes of using memory is full and i have to run Task Manager - Lvl 2 clear memory
                    finish();
                    System.exit(0);
                    return;

                }
            });
            alertDialog.setButton2("Cancle", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {

                            // dialog.cancel();
                            // GamePanel.thread.resume();
                            dialog.dismiss();
                            // When user press the "Cancle" button then game resume for 3 seconds then start again
                            // Here is the Code of the toasts and each toast appear with delay of one second.

                            toast = new Toast(Game.this);
                            TextView textView=new TextView(Game.this);
                            textView.setTextColor(Color.DKGRAY);
                            textView.setBackgroundColor(Color.TRANSPARENT);
                            textView.setTextSize(60);
                            textView.setText("READY!");
                            toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);

                            toast.setView(textView);
                            toast.show();

                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    // show toast 2.
                                    toast = new Toast(Game.this);
                                    TextView textView = new TextView(Game.this);
                                    textView.setTextColor(Color.DKGRAY);
                                    textView.setBackgroundColor(Color.TRANSPARENT);
                                    textView.setTextSize(140);
                                    textView.setText("3");
                                    // textView.setText("done!");
                                    toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);

                                    toast.setView(textView);
                                    toast.show();
                                }
                            }, 2500);


                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    // show toast 2.
                                    toast = new Toast(Game.this);
                                    TextView textView = new TextView(Game.this);
                                    textView.setTextColor(Color.DKGRAY);
                                    textView.setBackgroundColor(Color.TRANSPARENT);
                                    textView.setTextSize(140);
                                    textView.setText("2");
                                    toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);

                                    toast.setView(textView);
                                    toast.show();
                                }
                            }, 5000);

                            new Handler().postDelayed(new Runnable() {
                                @Override public void run() {
                                    toast = new Toast(Game.this);
                                    TextView textView=new TextView(Game.this);
                                    textView.setTextColor(Color.DKGRAY);
                                    textView.setBackgroundColor(Color.TRANSPARENT);
                                    textView.setTextSize(140);
                                    textView.setText("1");
                                    toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);

                                    toast.setView(textView);
                                    toast.show();

                                }
                            }, 7500);

                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run()
                                    GamePanel.thread.setRunning(true);
                                }
                            }, 10000);


                            return;
                        }
                    }

            );
            alertDialog.show();

            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

}

Answer 1

您需要为您的对话框设置一个 OnKeyListener 并检查是否按下了后退键。

这是一个适合您需要的示例代码，您需要按如下方式修改您的代码：

AlertDialog alertDialog = new AlertDialog.Builder(this,R.style.myBackgroundStyle).create();
        alertDialog.setTitle("Exit Alert");
        alertDialog.setMessage("Do you really want to exit the Game?");
        alertDialog.setButton("Quit", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                //Best way is firstly use finish() and after that use System.exit(0) to clear static variables. It will give you some free space.
                // A lot of applications leave working processes and variables what makes me angry. After 30 minutes of using memory is full and i have to run Task Manager - Lvl 2 clear memory
                finish();
                System.exit(0);
                return;

            }
        });


//New part regarding the back key when only dialog is shown.
alertDialog.setOnKeyListener(new Dialog.OnKeyListener() {

        @Override
        public boolean onKey(DialogInterface arg0, int keyCode,
                KeyEvent event) {

            if (keyCode == KeyEvent.KEYCODE_BACK) {

                alertDialog.dismiss();
            }
            return true;
        }
    });

这仅在显示对话框时有效，因此，您可以 return 到您的 activity