Android上警报对话框的Ok按钮

这是我的警报代码，按下按钮时会显示一条消息。我怎样才能按“确定”按钮来取消

    Button bm1 = (Button) findViewById(R.id.button1);
    bm1.setOnClickListener(new View.OnClickListener() {
        
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            AlertDialog alert = new AlertDialog.Builder(screen4.this).create();
            alert.setTitle("Doctor");
            alert.setMessage("message");
            alert.setCancelMessage(null);
            alert.show();
        }
    });
}}      

我已经设置了

警报。setCancelMessage（null）

，但它没有显示任何可关闭的按钮

解决方案：

      Button bm1 = (Button) findViewById(R.id.button1);
       bm1.setOnClickListener(new View.OnClickListener() {
        
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Builder alert = new AlertDialog.Builder(screen4.this);
            alert.setTitle("Doctor");
            alert.setMessage("message");
            alert.setPositiveButton("OK", null);
            alert.show();
        }
    });

---

alert.setPositiveButton或alert.setNegativeButton

您可以使用

setPositiveButton

和

setNegativeButton

    alert.setPositiveButton("OK", new OnClickListener() {

        @Override
        public void onClick(DialogInterface alert, int which) {
            // TODO Auto-generated method stub
            //Do something
            alert.dismiss();
        }
    });
    alert.setNegativeButton("Cancel", new OnClickListener() {

        @Override
        public void onClick(DialogInterface alert, int which) {
            // TODO Auto-generated method stub
            alert.dismiss();
        }
    });

编辑：

alert.setButton("OK", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        // Do something
        alert.dismiss();
        }
    });
alert.setButton("Cancel", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub

        alert.dismiss();
        }
    });

---

将alertdialog更改为：

Builder alert = new AlertDialog.Builder(screen4.this);
alert.setTitle("Doctor");
alert.setMessage("message");
alert.setPositiveButton("OK",null);
alert.show();    

---

您可以使用此命令为对话框创建“确定”和“取消”按钮

AlertDialog.Builder builder = new AlertDialog.Builder(
                        getApplicationContext());
                builder.setCancelable(true);
                builder.setTitle("Title");
                builder.setInverseBackgroundForced(true);
                builder.setPositiveButton("Yes",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                dialog.dismiss();
                            }
                        });
                builder.setNegativeButton("No",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                dialog.dismiss();
                            }
                        });
                AlertDialog alert = builder.create();
                alert.show();

---

检查API中的AlertDialog.Builder页面：

---

您可以分别使用setPositiveButton、setNeutralButton和setNegativeButton方法设置正极、中性和负极按钮

难道不能仅使用正极按钮吗？

    Button bm1 = (Button) findViewById(R.id.button1);
bm1.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    final AlertDialog dialog = new AlertDialog.Builder(screen4.this).create();
    dialog.setTitle("Doctor");
    dialog.setMessage("message");
    dialog.setButton("Ok",new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
            // here you can add functions

           }
    });
    dialog.setButton2("Cancel",new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int id) {
        // here you can add functions
               dialog.dismiss();
    }
    });
    dialog.show();
    }};      

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Look at this dialog!")
       .setCancelable(false)
       .setPositiveButton("OK", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
                //do things
           }
       });
AlertDialog alert = builder.create();
alert.show();

---

对于

AlertDialog alert

@user370305，没有任何方法

setPositiveButton

，是的，完全错过了它是一个AlertDialog。对于那些建议

setPositiveButton（）

或

setNegativeButton（）

打开

AlertDialog alert

的人，只要看看我这样做了，我就会给出错误并说：“类型AlertDialog的方法setPositiveButton（字符串null）未定义“@berkkaan，我认为如果你将null作为侦听器传递，它将不起作用。传递一个新的侦听器there@ShreyaShah传递null将关闭AlertDialogy，请更新您的答案，就像我在我的解决方案中所写的那样，以便人们看到并获得解决方案。有效，但按钮一直向右对齐。如何在不进行自定义布局的情况下将“确定”居中？它给出错误“类型AlertDialog中的方法setButton（Charsqence，DialogInterface.OnClickListener）已弃用”builder.setInverseBackgroundForced（true）；不赞成

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Look at this dialog!")
       .setCancelable(false)
       .setPositiveButton("OK", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
                //do things
           }
       });
AlertDialog alert = builder.create();
alert.show();

    bt = (Button) findViewById(R.id.button1);
    bt.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            ab = new AlertDialog.Builder(MainActivity.this);

            ab.setTitle("confirm");
            ab.setIcon(R.drawable.ic_launcher);
            ab.setMessage("Do u want to close this application?");

            ab.setPositiveButton("ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int i) {
                    Toast.makeText(MainActivity.this, "ok", Toast.LENGTH_SHORT).show();
                }
            });

            ab.setNegativeButton("cancle", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int i) {
                    Toast.makeText(MainActivity.this, "cancle", Toast.LENGTH_SHORT).show();
                }
            });

            ab.show();
        }
    });