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！");
}
});
} }
