View(视图)——对话框

对话框

一.分类

警告对话框AlertDialog：①一般对话框②单选对话框③复选对话框④自定义对话框

进度对话框

日期对话框

时间对话框

二.警告对话框 AlertDialong

1.一般

不能直接实例化使用

使用内部构造器来生成对话框

new AlertDialog.Builder(context)实例化构造器：（1）setTitle(标题)（2）setMessage(消息)

（3）按钮：①确认按钮 setPositiveButton("内容",点击事件监听器)②否认按钮 setNegativeButton("文字",点击事件监听器)③中立按钮 setNeutralButton("文字",点击事件监听器)

（4）show( ) 创建后显示对话框并返回AlertDialog实例（5）creat( ) 生成对话框并返回

（6）setCancelable(true/false)  ：①设置是否能点击其他地方关闭对话框②类似于模态窗口

2.单选对话框

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hanqi.testapp2.TestActivity5"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="一般对话框"
        android:onClick="bt1_OnClick"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="单选对话框"
        android:onClick="bt2_OnClick"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="复选对话框"
        android:onClick="bt3_OnClick"/>

</LinearLayout>

package com.hanqi.testapp2;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class TestActivity5 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test5);
    }

    //一般对话框
    public void bt1_OnClick(View v)
    {
        //对话框不能直接实例化
        //内部提供了构造器
        //方法链调用
        AlertDialog alertDialog=new AlertDialog.Builder(this)
                .setTitle("确认对话框")
                .setMessage("你确实要删除吗？")
                .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        Toast.makeText(TestActivity5.this, "执行删除,which="+which, Toast.LENGTH_SHORT).show();

                    }
                })//正面按钮
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {


                        Toast.makeText(TestActivity5.this, "取消删除，which="+which, Toast.LENGTH_SHORT).show();

                    }
                })//负面按钮
                .setNeutralButton("中立", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        Toast.makeText(TestActivity5.this, "普通按钮,which"+which, Toast.LENGTH_SHORT).show();

                    }
                }).setCancelable(false)
                .show();//显示对话框
    }

    //单选对话框
    public void bt2_OnClick(View v)
    {
        //final 可以使这个常量的生命周期延长到整个对象
        final String [] str={"男","女"};
        new AlertDialog.Builder(this)
                .setTitle("单选对话框")
                .setSingleChoiceItems(str, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        Toast.makeText(TestActivity5.this, "which="+which+",选中的是"+str[which], Toast.LENGTH_SHORT).show();

                        //关闭对话框
                        dialog.dismiss();
                    }
                }).setCancelable(false)
                .show();
    }

    //复选对话框
    public void bt3_OnClick(View v)
    {
        final String [] str={"宝马","奔驰","劳斯莱斯","宾利"};
        final boolean[] ch={true,false,false,true};

        new AlertDialog.Builder(this)
                .setTitle("复选对话框")
                .setMultiChoiceItems(str, ch, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {

                        //改变对应数组项的选中状态
                        ch[which]=isChecked;
                    }
                })
                .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        int i=0;
                        //获取最终的选中状态
                        for(boolean b:ch)
                        {
                            Toast.makeText(TestActivity5.this, str[i]+"选中状态="+(b?"选中":"未选中"), Toast.LENGTH_LONG).show();

                            i++;
                        }


                    }
                })
                .setNegativeButton("取消", null)
                .setCancelable(false)
                .show();
    }

}