<AlertDialog>的简单用法与功能

package com.crazyit.ui.dialogdemo;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Dialog
 * AlertDialog 是父类
 * 3个子类 ProgressDialog  DataPickerDialog  TimePickerDialog
 * <p/>
 * AlertDialog 生成的对话框分为以下4个区域:
 * 图标区  标题区  内容区  按钮区
 */
public class MainActivity extends AppCompatActivity {
    TextView show;
    Button btn, btn2,btn3,btn4,btn5,btn6;

    String[] str = new String[]{"连城诀","雪山飞狐", "神雕侠侣", "天龙八部",  "射雕英雄传", "倚天屠龙记"};

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

        show = (TextView) findViewById(R.id.show);
        btn = (Button) findViewById(R.id.button);
        btn2 = (Button) findViewById(R.id.button2);
        btn3 = (Button) findViewById(R.id.button3);
        btn4 = (Button) findViewById(R.id.button4);
        btn5 = (Button) findViewById(R.id.button5);
        btn6 = (Button) findViewById(R.id.button6);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

                builder.setTitle("简单对话框") //设置对话框标题
                        .setIcon(R.mipmap.fuqi) //设置图标
                        .setMessage("对话框的测试内容\n 第二行内容"); //设置内容

                //添加确定按钮

                setPositiveButton(builder);
                setNegativeButton(builder) //添加取消按钮
                        .create().show();

            }
        });

        //简单列表项的对话框
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("简单列表项的对话框")
                        .setIcon(R.mipmap.fuqi)
                        .setItems(str, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                show.setText("你选中了 <<" + str[which] + ">>");
                            }
                        });
                setPositiveButton(builder);
                setNegativeButton(builder) //添加取消按钮
                        .create().show();
            }



        });

        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("单选列表项对话框")
                        .setIcon(R.mipmap.fuqi)
                        // 数字 1 代表是默认选中 索引为1的列表项
                        .setSingleChoiceItems(str, 0, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                show.setText("你选中了 <<" + str[which] + ">>");

                                dialog.dismiss();
                            }
                        });


//注释 表示去掉 确定和取消按钮
//                            setPositiveButton(builder);
//                            setNegativeButton(builder) //添加取消按钮
                builder.create().show();

            }
        });

        btn4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("多选列表项对话框")
                        .setIcon(R.mipmap.fuqi)
                        .setMultiChoiceItems(str, new boolean[]{false, true, true, false, true, false}, new DialogInterface.OnMultiChoiceClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                                show.setText("你选中了 <<" + str[which] + ">>");
                            }


                        });
                setPositiveButton(builder);
                setNegativeButton(builder) //添加取消按钮
                        .create().show();
            }
        });

        btn5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("自定义列表项")
                        .setIcon(R.mipmap.fuqi)
                        .setAdapter(new ArrayAdapter<String>(MainActivity.this, R.layout.array_item, str), null);
                setPositiveButton(builder);
                setNegativeButton(builder) //添加取消按钮
                        .create().show();
            }
        });

        btn6.setOnClickListener(new View.OnClickListener() {

            //加载布局界面
          //  LinearLayout login = (LinearLayout) getLayoutInflater().inflate(R.layout.login,null);
            LayoutInflater inflater = LayoutInflater.from(MainActivity.this);

            LinearLayout login = (LinearLayout) inflater.inflate(R.layout.login, null, false);

            @Override
            public void onClick(View v) {

                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

                builder.setTitle("自定义View对话框")
                        .setIcon(R.mipmap.fuqi)
                        .setView(login)  //设置 对话框显示的自定义view
                .setPositiveButton("登录", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_SHORT).show();

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

                    }
                }).create().show();
            }

        });
    }

    private AlertDialog.Builder setNegativeButton(AlertDialog.Builder builder) {
        return builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                show.setText("单击了[取消]按钮");
            }
        });
    }

    private AlertDialog.Builder setPositiveButton(AlertDialog.Builder builder) {

        //调用添加 确定按钮
        return builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                show.setText("单击了[确定]按钮!");
            }
        });
    }

}

布局文件

<?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:orientation="vertical"
    tools:context="com.crazyit.ui.dialogdemo.MainActivity">

    <!-- 显示一个普通的文本编辑框组件 -->
    <EditText
        android:id="@+id/show"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:editable="false" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示提示消息的对话框" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="简单列表项对话框" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="单选列表项对话框" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="多选列表项对话框" />

    <Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自定义列表项对话框" />

    <Button
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自定义View对话框" />

    <Button
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

---

AlertDialog 提供了6种方法来指定对话框的内容.

1. setMessage() ;设置对话框内容为简单文本内容
2. setItems( );设置对话框内容为简单的列表项
3. setSingleChoiceItems();设置对话框内容为单选列表项
4. setMultiChoiceItems();设置对话框内容为多选列表项
5. setAdapter(); 设置对话框内容为自定义列表项
6. setView() 设置对话框内容为自定义 view