增加游戏退出时的二次确认

app/src/main/java/com/hnjc/wjtx/MainActivity.java

@@ -1,6 +1,7 @@
 package com.hnjc.wjtx;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.res.Resources;
@@ -84,7 +85,19 @@ public class MainActivity extends Activity {
     @Override
     public boolean onKeyDown(final int keyCode, final KeyEvent keyEvent) {
         if (keyCode == KeyEvent.KEYCODE_BACK) {
+            //声明并初始化弹出对象
+            AlertDialog.Builder builder=new AlertDialog.Builder(this);
+            builder.setTitle("提示：");
+            builder.setMessage("是否退出");
+            //设置确认按钮
+            builder.setNegativeButton("确定", (dialog, which) -> {
                 nativeAndroid.exitGame();
+                finish();//退出程序
+            });
+            //设置取消按钮
+            builder.setPositiveButton("取消",null);
+            //显示弹框
+            builder.show();
         }
 
         return super.onKeyDown(keyCode, keyEvent);