java - 如何修改AlertDialog(Android)？

Question

我是 Java 和 Android Studio 的初学者，所以，我的问题是:我为某个 Activity 创建了一个警报对话框窗口，其中正按钮为“确定”，负按钮为“不，谢谢”。如下面的代码所示。

if(Times==0) {
        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
        builder1.setIcon(android.R.drawable.ic_dialog_alert);
        builder1.setTitle("Warning");
        builder1.setMessage("Rooting of a phone may void your Warranty in most of the cases,so it is adviced to proceed at your own risk");
        builder1.setCancelable(true);

        builder1.setPositiveButton(
                "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        Times += 1;
                        dialog.cancel();
                    }
                });

        builder1.setNegativeButton(
                "No Thanks",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();

                    }
                });
 }

一切进展顺利，但现在的问题是，我希望它仅在用户单击“确定”按钮时显示一次，并且不想在用户单击“确定”按钮时再次显示。我在类中创建了一个变量 times 并将其初始化为零，如下所示。

public class rootingRooting extends AppCompatActivity {

int Times=0;

并将完整的AlertDialog放入if循环中，并在用户单击“确定”时递增其值，以便在用户单击“确定”时循环仅执行一次，但它是每当我打开 Activity 时，尽管单击“确定”，但都会显示警报框，但没有用。所以，现在我想做的事情是:

1. 如果用户单击“确定”，则不应显示警告框。

2. 如果用户单击“不，谢谢”按钮，我想带他到家庭 Activity 。那么，我应该如何使用带有“不，谢谢”按钮的 Intent ？

谢谢。

Answer 1

您需要使用SharedPreferenes来持久保存数据，局部变量没有帮助。像这样的东西:

编辑根据您的要求，我添加了一个示例 Activity 类来显示整个过程。请参阅中间的评论以获取更多信息

编辑2查看//第二次编辑评论后的代码

public class MainActivity extends AppCompatActivity {
        SharedPreferences prefs;
            @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);
                //When the activity starts, we look into the shared prefs and get an int of name "ok_clicked" from it.
                //0 will be the default value of the int if there is no int stored in sharedPreferences.
                prefs = getSharedPreferences("myPrefs", MODE_PRIVATE);
                int times = prefs.getInt("ok_clicked", 0);
                //if the times value is 0, we will open the dialog, otherwise nothing happens
                if (times==0){
                    openDialog();
                }
            }
            //Read This comment First: We will create a Method, which create an alert Dialog.
            private void openDialog(){
                AlertDialog.Builder dialog = new AlertDialog.Builder(this);
                dialog.setTitle("Test").setMessage("Lorem ipsum dolor");
                dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //When OK button is clicked, an int with value of 1 will be saved in sharedPreferences.
                        prefs = getSharedPreferences("myPrefs", MODE_PRIVATE);
                        SharedPreferences.Editor editor = prefs.edit();
                        editor.putInt("ok_clicked", 1);
                        editor.apply();
                    }
                });
                dialog.setNegativeButton("No Thanks", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    //Second Edit: To open another acitivty on No Thanks Button
                    Intent intent = new Intent(MyActivity.this, HomeActivity.class);                                   
                    startActivity(intent);
                   }
                });
                dialog.show();
            }
        }