Android学习05

其他 2020-02-05 17:41:07 阅读次数: 0

AlertDialog（对话框）

      它也是其他 Dialog的的父类！比如ProgressDialog，TimePickerDialog等，而AlertDialog的父类是：Dialog！

      AlertDialog并不能直接new出来，构造方法是protected的，要创建AlertDialog的话，需要使用到该类中的一个静态内部类：public static class Builder，然后来调用AlertDialog 里的相关方法，来对AlertDialog进行定制，最后调用show()方法来显示AlertDialog对话框！


      AlertDialog有几个基本方法，


      例如：setTitile() setMessage() setCancelable() setPositiveButton() setNegativeButton() setNeutralButton() 等等。

1、带按钮的AlertDialog

点击按钮弹出提示内容；

public void onClick(View v) {
            switch (v.getId()) {
                case R.id.btn_dialog1:
                    AlertDialog.Builder builder = new AlertDialog.Builder(DialogActivity.this);
                    builder.setTitle("请回答").setMessage("想见你会加更吗？")
                            .setPositiveButton("会", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    Toast.makeText(DialogActivity.this, "你点击了会", Toast.LENGTH_SHORT).show();
                                }
                            }).setNegativeButton("不会", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(DialogActivity.this, "你点击了不会", Toast.LENGTH_SHORT).show();
                        }
                    }).show();
                    break;
View Code

2.1、类似RadioButton的AlertDialog，单选

case R.id.btn_dialog2:
                    final String[] array2 = new String[]{"男", "女"};
                    AlertDialog.Builder builder2 = new AlertDialog.Builder(DialogActivity.this);
                    builder2.setTitle("选择性别").setItems(array2, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(DialogActivity.this, array2[which], Toast.LENGTH_SHORT).show();
                        }
                    }).show();
                    break;
View Code

2.2、与RadioButton一样的AlertDialog

case R.id.btn_dialog3:
                    final String[] array3 = new String[]{"男", "女"};
                    AlertDialog.Builder builder3 = new AlertDialog.Builder(DialogActivity.this);
                    builder3.setTitle("选择性别").setSingleChoiceItems(array3, 0, new DialogInterface.OnClickListener() {
                        @Override                                                     //默认选中第几个
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(DialogActivity.this, array3[which], Toast.LENGTH_SHORT).show();
                            //选择之后对话框会消失
                            dialog.dismiss();
                        }//点框外对话框不会消失
                    }).setCancelable(false).show();
                    break;
View Code

3、与CheckBox一样的AlertDialog

case R.id.btn_dialog4:
                    final String[] array4 = new String[]{"唱", "跳","rap"};
                    boolean[] isSelected = new boolean[]{false,false,true};
                    AlertDialog.Builder builder4 = new AlertDialog.Builder(DialogActivity.this);
                    builder4.setTitle("选择兴趣").setMultiChoiceItems(array4, isSelected, new DialogInterface.OnMultiChoiceClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                            //which表示当前选中第几个，isChecked表示选中或取消选中
                            Toast.makeText(DialogActivity.this, array4[which]+":"+isChecked, Toast.LENGTH_SHORT).show();
                        }
                    }).setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            //
                        }
                    }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            //
                        }
                    }).show();
                    break;
View Code

4、自定义View的AlertDialog

要实现一个Login画面，有用户名和密码，这时我们就要用到自定义View的AlertDialog，步骤如下：

  • 先创建自定义登录框的布局文件layout_dialog.xml
  • 在Activity中创建自定义的AlertDialog

 layout_dialog.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp">

    <EditText
        android:id="@+id/et_username"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textSize="15sp"
        android:textColor="#FF8F44"
        android:background="@drawable/bg_username"
        android:hint="用户名"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"/>

    <EditText
        android:id="@+id/et_password"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textSize="15sp"
        android:textColor="#FF8F44"
        android:layout_below="@id/edit_1"
        android:background="@drawable/bg_username"
        android:hint="密码"
        android:inputType="textPassword"
        android:layout_marginTop="15dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"/>

    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_below="@id/edit_2"
        android:layout_marginTop="20dp"
        android:background="@drawable/bg_btn4"
        android:text="登录"
        android:textSize="20sp"
        android:textColor="#fff"/>
</LinearLayout>
View Code

Activity：

case R.id.btn_dialog5:
                    AlertDialog.Builder builder5 = new AlertDialog.Builder(DialogActivity.this);
                    View view = LayoutInflater.from(DialogActivity.this).inflate(R.layout.layout_dialog,null);
                    //声明布局里的控件
                    EditText etUsername = view.findViewById(R.id.et_username);
                    EditText etPassword = view.findViewById(R.id.et_password);
                    Button btnLogin = view.findViewById(R.id.btn_login);
                    btnLogin.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            //
                        }
                    });
                    builder5.setTitle("请登录").setView(view).show();
                    break;
View Code

完整代码：

DialogActivity：

package com.example.helloworld;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class DialogActivity extends AppCompatActivity {

    private Button mBtnDialog1, mBtnDialog2, mBtnDialog3, mBtnDialog4,mBtnDialog5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dialog);
        mBtnDialog1 = findViewById(R.id.btn_dialog1);
        mBtnDialog2 = findViewById(R.id.btn_dialog2);
        mBtnDialog3 = findViewById(R.id.btn_dialog3);
        mBtnDialog4 = findViewById(R.id.btn_dialog4);
        mBtnDialog5 = findViewById(R.id.btn_dialog5);
        onClick onClick = new onClick();
        mBtnDialog1.setOnClickListener(onClick);
        mBtnDialog2.setOnClickListener(onClick);
        mBtnDialog3.setOnClickListener(onClick);
        mBtnDialog4.setOnClickListener(onClick);
        mBtnDialog5.setOnClickListener(onClick);
    }

    class onClick implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.btn_dialog1:
                    AlertDialog.Builder builder = new AlertDialog.Builder(DialogActivity.this);
                    builder.setTitle("请回答").setMessage("想见你会加更吗？")
                            .setPositiveButton("会", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    Toast.makeText(DialogActivity.this, "你点击了会", Toast.LENGTH_SHORT).show();
                                }
                            }).setNegativeButton("不会", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(DialogActivity.this, "你点击了不会", Toast.LENGTH_SHORT).show();
                        }
                    }).show();
                    break;
                case R.id.btn_dialog2:
                    final String[] array2 = new String[]{"男", "女"};
                    AlertDialog.Builder builder2 = new AlertDialog.Builder(DialogActivity.this);
                    builder2.setTitle("选择性别").setItems(array2, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(DialogActivity.this, array2[which], Toast.LENGTH_SHORT).show();
                        }
                    }).show();
                    break;
                case R.id.btn_dialog3:
                    final String[] array3 = new String[]{"男", "女"};
                    AlertDialog.Builder builder3 = new AlertDialog.Builder(DialogActivity.this);
                    builder3.setTitle("选择性别").setSingleChoiceItems(array3, 0, new DialogInterface.OnClickListener() {
                        @Override                                                     //默认选中第几个
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(DialogActivity.this, array3[which], Toast.LENGTH_SHORT).show();
                            //选择之后对话框会消失
                            dialog.dismiss();
                        }//点框外对话框不会消失
                    }).setCancelable(false).show();
                    break;
                case R.id.btn_dialog4:
                    final String[] array4 = new String[]{"唱", "跳","rap"};
                    boolean[] isSelected = new boolean[]{false,false,true};
                    AlertDialog.Builder builder4 = new AlertDialog.Builder(DialogActivity.this);
                    builder4.setTitle("选择兴趣").setMultiChoiceItems(array4, isSelected, new DialogInterface.OnMultiChoiceClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                            //which表示当前选中第几个，isChecked表示选中或取消选中
                            Toast.makeText(DialogActivity.this, array4[which]+":"+isChecked, Toast.LENGTH_SHORT).show();
                        }
                    }).setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            //
                        }
                    }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            //
                        }
                    }).show();
                    break;
                case R.id.btn_dialog5:
                    AlertDialog.Builder builder5 = new AlertDialog.Builder(DialogActivity.this);
                    View view = LayoutInflater.from(DialogActivity.this).inflate(R.layout.layout_dialog,null);
                    //声明布局里的控件
                    EditText etUsername = view.findViewById(R.id.et_username);
                    EditText etPassword = view.findViewById(R.id.et_password);
                    Button btnLogin = view.findViewById(R.id.btn_login);
                    btnLogin.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            //
                        }
                    });
                    builder5.setTitle("请登录").setView(view).show();
                    break;

            }
        }
    }

}
View Code

activity_edit_text.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp">
    <EditText
        android:id="@+id/edit_1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textSize="15sp"
        android:textColor="#FF8F44"
        android:background="@drawable/bg_username"
        android:hint="用户名"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"/>

    <EditText
        android:id="@+id/edit_2"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textSize="15sp"
        android:textColor="#FF8F44"
        android:layout_below="@id/edit_1"
        android:background="@drawable/bg_username"
        android:hint="密码"
        android:inputType="textPassword"
        android:layout_marginTop="15dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"/>

    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_below="@id/edit_2"
        android:layout_marginTop="20dp"
        android:background="@drawable/bg_btn4"
        android:text="登录"
        android:textSize="20sp"
        android:textColor="#fff"/>
</RelativeLayout>
View Code

猜你喜欢

转载自www.cnblogs.com/xjmm/p/12264589.html
今日推荐
《美国对全球网络空间安全与发展的威胁和破坏》报告发布
火速冲上 GitHub 热榜 —— 开源编程语言、框架哪有这么可爱？
北京人形机器人创新中心发布全球首个纯电驱拟人奔跑的全尺寸人形机器人“天工”
LFOSSA 源来如此公开课 | 掌握云原生未来：CNCF 认证全面攻略与备考秘籍
国产云输入法——仅华为无云端数据上传安全问题
周排行
Python环境安装与基础语法（1）——计算机基础知识
IMU预积分
ADAS中的LDW、FCW、BSD、LCA、ACC、AEB、APA、DMS代表的含义
B站笔试两道题
skyeye arm 硬件虚拟机环境的搭建
Web前端静态页面示例
数组-合并排序数组 II-简单
springcloud之版本问题启动报错
面向对象-------------匿名对象(六)
输入URL到页面呈现中间发生了什么？
每日归档
更多
2024-04-30(1)
2024-04-29(40)
2024-04-28(0)
2024-04-27(56)
2024-04-26(39)
2024-04-25(22)
2024-04-24(36)
2024-04-23(26)
2024-04-22(39)
2024-04-21(0)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022