Java 按下后退键时的对话框
当我按下我的设备对话框的Java 按下后退键时的对话框,java,android,android-alertdialog,Java,Android,Android Alertdialog,当我按下我的设备对话框的backkey时，我有一个游戏的alertDialog。如果我按“退出”，我的游戏结束，如果我按“取消”，则土司会出现3秒钟，3秒钟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，会出现一个对话框，我执行一些功能，它工作正常，但是如果我再次按下backkey而没有“取消”或“退出”游戏，那么我的游戏不会再次恢复，直到我按下“否”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
backkeyalertDialogbackkeybackkeybackkeybackkey@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);
}
}
您需要在对话框中设置一个
OnKeyListenerAlertDialog 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;
}
});
这只有在显示对话框时才起作用，因此，您可以返回到您的活动您能告诉我需要将此代码放在哪里吗？请通过添加您的代码来编辑我的代码。感谢实现这一点还有一种更简单的方法：使用
alertDialog.setCancelable（true）如果您不希望在用户触摸对话框外部时将其取消，请同时使用alertDialog.setCanceledOnTouchOut（false）