Android基础-Adapter适配器生成对话框

设计点击事件用来生成对话框的适配器

第一种形式的对话框适配器是通过调用android.R.layout.simple_dropdown_item_1line,传入的格式是以textView为根目录的

final String[] items = {"Java", "Mysql", "Android", "HTML", "C", "JavaScript"};
 //数组适配器
        //参数1:环境
        //参数2：布局资源索引, 每一个数据所呈现的样式 android.R.layout
        //参数3:数据源
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, items);
AlertDialog.Builder builder = new AlertDialog.Builder(this)
                .setTitle("请选择").setAdapter(adapter, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, items[which], Toast.LENGTH_LONG).show();

                    }
                });
        //参数1:适配器对象(规则制定器)
        //参数2:监视器
        builder.show();

第二种:为了让生成的适配器可以使用图片，第二种输入四个参数，指定哪个位置用来摆放文本 

 final String[] items = {"Java", "Mysql", "Android", "HTML", "C", "JavaScript"};
//参数3:int textviewid.指定文本需要放在布局中对应id文本控制的位置
ArrayAdapter adapter = new ArrayAdapter(this, R.layout.array_item_layout, R.id.item_txt, items);
 AlertDialog.Builder builder = new AlertDialog.Builder(this)
                .setTitle("请选择").setAdapter(adapter, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, items[which], Toast.LENGTH_LONG).show();

                    }
                });
        //参数1:适配器对象(规则制定器)
        //参数2:监视器
        builder.show();

array_item_layout.xml 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="wrap_content" android:orientation="horizontal"
    android:padding="10dp"
    android:gravity="center_vertical">

    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@mipmap/star"/>

    <TextView
        android:id="@+id/item_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="测试"
        android:layout_margin="15dp"/>

</LinearLayout>

完整java代码

package com.example.dialog;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.PopupWindow;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

    public void showNormalDialog(){
        AlertDialog dialog = new AlertDialog.Builder(this).create();
        dialog.setTitle("提示");
        dialog.setMessage("您确定要退出程序吗？");
        dialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

            }
        });
        dialog.show();
    }


    public void myClick(View view) {
        switch (view.getId()) {
            case R.id.normal_dialog_btn:
                //1.实例化一个Buidler
                //AlertDialog的构造方法时protected
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                //2.设置对话框样式
                builder.setTitle("提示");
                builder.setMessage("您确定退出程序吗?");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                    }
                });
                //展示 
                builder.setNegativeButton("取消", null);
                builder.show();
//                AlertDialog dialog = builder.create();
//                dialog.show();
                break;

            case R.id.diy_dialog_btn:
                Mydialog md = new Mydialog(this, R.style.mydialog);
                md.show();
                break;

            case R.id.popup_btn:
                showPopupWindow(view);
                break;

            case R.id.btn10:
                showArrayDialog();
        }
    }

    private void showArrayDialog() {
        final String[] items = {"Java", "Mysql", "Android", "HTML", "C", "JavaScript"};
        //数组适配器
        //参数1:环境
        //参数2：布局资源索引, 每一个数据所呈现的样式 android.R.layout
        //参数3:数据源
        //ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, items);
        //参数3:int textviewid.指定文本需要放在布局中对应id文本控制的位置
        ArrayAdapter adapter = new ArrayAdapter(this, R.layout.array_item_layout, R.id.item_txt, items);
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                .setTitle("请选择").setAdapter(adapter, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, items[which], Toast.LENGTH_LONG).show();

                    }
                });
        //参数1:适配器对象(规则制定器)
        //参数2:监视器
        builder.show();
    }






    public void showPopupWindow(View view) {
        //准备弹出所需要的视图对象
        View v = LayoutInflater.from(this).inflate(R.layout.popup_layout, null);
        //1.实例化对象
       //将整个布局变成View
        //参数1：用在弹窗中的View
        //参数2,3：弹窗的宽高
        //参数4(focusable): 能否获取焦点
        PopupWindow window = new PopupWindow(v, 600, 80, true);

        //2.设置(背景, 动画)
        //设置背景
        window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); //设置背景为透明色
        //设置能响应外部的点击事件
        window.setOutsideTouchable(true);
        //设置能响应点击事件
        window.setTouchable(true);
        //1.创建动画资源 2.创建一个style应用动画资源 3.对当前弹窗的动画风格设置为第二步的资源索引
        window.setAnimationStyle(R.style.translate_anim);
        //3.显示
        //参数1(anchor):锚
        //参数2,3：相对于锚在x,y方向上的偏移量
        window.showAsDropDown(view, -600, 0);

        //为弹窗中的文本添加点击事件
        v.findViewById(R.id.choose).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "您点击了选择", Toast.LENGTH_LONG).show();
                window.dismiss(); //控制弹窗消失
            }
        });

        //为弹窗中的文本添加点击事件
        v.findViewById(R.id.choose_all).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "您点击了全选", Toast.LENGTH_LONG).show();
                window.dismiss();
            }
        });

        //为弹窗中的文本添加点击事件
        v.findViewById(R.id.copy).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "您点击了复制", Toast.LENGTH_LONG).show();
                window.dismiss();
            }
        });
    }
}