Android学习：AlertDialog对话框

AlertDialog可以生成各种内容的对话框，它生成的对话框包含4个区域：
图标区，标题区，内容区，按钮区

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="allegro.alertdialog.MainActivity"
    tools:layout_editor_absoluteY="81dp"
    tools:layout_editor_absoluteX="0dp">

    <!-- 显示一个普通的文本编辑框组件 -->
    <EditText
        android:id="@+id/show"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:editable="false"
        android:layout_marginRight="8dp"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="8dp"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintLeft_creator="1" />

    <!-- 定义一个普通的按钮组件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="简单对话框"
        android:onClick="simple"
        android:id="@+id/button"
        android:layout_marginEnd="26dp"
        app:layout_constraintRight_toLeftOf="@+id/button2"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintTop_toTopOf="@+id/button2" />

    <!-- 定义一个普通的按钮组件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="简单列表项对话框"
        android:onClick="simpleList"
        android:id="@+id/button4"
        android:layout_marginStart="16dp"
        tools:layout_constraintTop_creator="1"
        android:layout_marginTop="52dp"
        app:layout_constraintTop_toBottomOf="@+id/button3"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="@+id/button3" />

    <!-- 定义一个普通的按钮组件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="单选列表项对话框"
        android:onClick="singleChoice"
        android:layout_marginEnd="36dp"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginBottom="191dp" />

    <!-- 定义一个普通的按钮组件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="多选列表项对话框"
        android:onClick="multiChoice"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        android:layout_marginEnd="16dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button2" />

    <!-- 定义一个普通的按钮组件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="自定义列表项对话框"
        android:onClick="customList"
        android:id="@+id/button2"
        android:layout_marginStart="6dp"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button3"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="9dp"
        app:layout_constraintLeft_toRightOf="@+id/button3" />

    <!-- 定义一个普通的按钮组件 -->
    <Button
        android:layout_width="88dp"
        android:layout_height="wrap_content"
        android:text="自定义View对话框"
        android:onClick="customView"
        android:id="@+id/button3"
        android:layout_marginStart="78dp"
        tools:layout_constraintTop_creator="1"
        android:layout_marginTop="186dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

package allegro.alertdialog;

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

public class MainActivity extends AppCompatActivity {
    TextView show;
    String[] items = new String[] {
            "疯狂Java讲义", "疯狂Ajax讲义",
            "轻量级Java EE企业应用实战",
            "疯狂Android讲义" };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show = (TextView) findViewById(R.id.show);
    }

    public void simple(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 设置对话框标题
                .setTitle("简单对话框")
                // 设置图标
                .setIcon(R.drawable.tools)
                .setMessage("对话框的测试内容\n第二行内容");
        // 为AlertDialog.Builder添加“确定”按钮
        setPositiveButton(builder);
        // 为AlertDialog.Builder添加“取消”按钮
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void simpleList(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 设置对话框标题
                .setTitle("简单列表对话框")
                // 设置图标
                .setIcon(R.drawable.tools)
                // 设置简单的列表项内容
                .setItems(items, new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        show.setText("你选中了《" + items[which] + "》");
                    }
                });
        // 为AlertDialog.Builder添加“确定”按钮
        setPositiveButton(builder);
        // 为AlertDialog.Builder添加“取消”按钮
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void singleChoice(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 设置对话框标题
                .setTitle("单选列表项对话框")
                // 设置图标
                .setIcon(R.drawable.tools)
                // 设置单选列表项，默认选中第二项（索引为1）
                .setSingleChoiceItems(items, 1, new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        show.setText("你选中了《" + items[which] + "》");
                    }
                });
        // 为AlertDialog.Builder添加“确定”按钮
        setPositiveButton(builder);
        // 为AlertDialog.Builder添加“取消”按钮
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void multiChoice(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 设置对话框标题
                .setTitle("多选列表项对话框")
                // 设置图标
                .setIcon(R.drawable.tools)
                // 设置多选列表项，设置勾选第2项、第4项
                .setMultiChoiceItems(items
                        , new boolean[]{false , true ,false ,true}, null);
        // 为AlertDialog.Builder添加“确定”按钮
        setPositiveButton(builder);
        // 为AlertDialog.Builder添加“取消”按钮
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void customList(View source)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
                // 设置对话框标题
                .setTitle("自定义列表项对话框")
                // 设置图标
                .setIcon(R.drawable.tools)
                // 设置自定义列表项
                .setAdapter(new ArrayAdapter<String>(this
                        , R.layout.array_item
                        , items), null);
        // 为AlertDialog.Builder添加“确定”按钮
        setPositiveButton(builder);
        // 为AlertDialog.Builder添加“取消”按钮
        setNegativeButton(builder)
                .create()
                .show();
    }

    public void customView(View source)
    {
        // 装载app\src\main\res\layout\login.xml界面布局文件
        TableLayout loginForm = (TableLayout)getLayoutInflater()
                .inflate( R.layout.login, null);
        new AlertDialog.Builder(this)
                // 设置对话框的图标
                .setIcon(R.drawable.tools)
                // 设置对话框的标题
                .setTitle("自定义View对话框")
                // 设置对话框显示的View对象
                .setView(loginForm)
                // 为对话框设置一个“确定”按钮
                .setPositiveButton("登录", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog,
                                        int which) {
                        // 此处可执行登录处理
                    }
                })
                // 为对话框设置一个“取消”按钮
                .setNegativeButton("取消", new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog,
                                        int which)
                    {
                        // 取消登录，不做任何事情
                    }
                })
                // 创建并显示对话框
                .create()
                .show();
    }

    private AlertDialog.Builder setPositiveButton(
            AlertDialog.Builder builder)
    {
        // 调用setPositiveButton方法添加“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！");
            }
        });
    }
    private AlertDialog.Builder setNegativeButton(
            AlertDialog.Builder builder)
    {
        // 调用setNegativeButton方法添加“取消”按钮
        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！");
            }
        });
    }

}