2.31AlertDialog(对话框)_Android
AlertDialog(对话框)_Android
设置流程:
- 创建AlertDialog.Builder对象；
- 调用setIcon()设置图标，setTitle()或setCustomTitle()设置标题；
- 设置对话框的内容：setMessage()还有其他方法来指定显示的内容；
- 调用setPositive/Negative/NeutralButton()设置：确定，取消，中立按钮；
- 调用create()方法创建这个对象，再调用show()方法将对话框显示出来；
java设计模式：建造者模式-Builder模式
- 确定弹窗
- 列表
- 单选列表
- 多选列表
<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:padding="5dp"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/btn_dialog_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1.显示一个普通的Dialog" />
<Button
android:id="@+id/btn_dialog_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.显示一个带普通列表的Dialog" />
<Button
android:id="@+id/btn_dialog_three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3.显示一个带单选列表的Dialog" />
<Button
android:id="@+id/btn_dialog_four"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4.显示一个带复选框列表的Dialog" />
</LinearLayout>
AlertDialogActivity
package com.ttit.helloworld;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class AlertDialogActivity extends AppCompatActivity implements View.OnClickListener {
private Button btn_dialog_one;
private Button btn_dialog_two;
private Button btn_dialog_three;
private Button btn_dialog_four;
private Context mContext;
private boolean[] checkItems;
private AlertDialog alert = null;
private AlertDialog.Builder builder = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.alertdailog_layout);
mContext = this;
bindView();
}
private void bindView() {
btn_dialog_one = (Button) findViewById(R.id.btn_dialog_one);
btn_dialog_two = (Button) findViewById(R.id.btn_dialog_two);
btn_dialog_three = (Button) findViewById(R.id.btn_dialog_three);
btn_dialog_four = (Button) findViewById(R.id.btn_dialog_four);
btn_dialog_one.setOnClickListener(this);
btn_dialog_two.setOnClickListener(this);
btn_dialog_three.setOnClickListener(this);
btn_dialog_four.setOnClickListener(this);
}
//按钮点击事件
@Override
public void onClick(View v) {
switch (v.getId()) {
//普通对话框
case R.id.btn_dialog_one:
alert = null;
builder = new AlertDialog.Builder(mContext);
alert = builder.setIcon(R.mipmap.ic_icon_fish)//图标
.setTitle("系统提示：")//标题
//设置内容消息
.setMessage("这是一个最普通的AlertDialog,\n带有三个按钮，分别是取消，中立和确定")
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(mContext, "你点击了取消按钮~", Toast.LENGTH_SHORT).show();
}
})
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(mContext, "你点击了确定按钮~", Toast.LENGTH_SHORT).show();
}
})
.setNeutralButton("中立", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(mContext, "你点击了中立按钮~", Toast.LENGTH_SHORT).show();
}
}).create(); //创建AlertDialog对象
alert.show(); //显示对话框
break;
//普通列表对话框
case R.id.btn_dialog_two:
final String[] lesson = new String[]{"语文", "数学", "英语", "化学", "生物", "物理", "体育"};
alert = null;
builder = new AlertDialog.Builder(mContext);
alert = builder.setIcon(R.mipmap.ic_icon_fish)
.setTitle("选择你喜欢的课程")
// .setMessage("这是一个最普通的AlertDialog,\n带有三个按钮，分别是取消，中立和确定") //若是设置了这个,下面的setItems就不起作用了
//设置列表
.setItems(lesson, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "你选择了" + lesson[which], Toast.LENGTH_SHORT).show();
}
}).create();
alert.show();
break;
//单选列表对话框
case R.id.btn_dialog_three:
final String[] fruits = new String[]{"苹果", "雪梨", "香蕉", "葡萄", "西瓜"};
alert = null;
builder = new AlertDialog.Builder(mContext);
alert = builder.setIcon(R.mipmap.ic_icon_fish)
.setTitle("选择你喜欢的水果，只能选一个哦~")
//单选列表
.setSingleChoiceItems(fruits, 0, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "你选择了" + fruits[which], Toast.LENGTH_SHORT).show();
}
}).create();
alert.show();
break;
//多选列表对话框
case R.id.btn_dialog_four:
final String[] menu = new String[]{"水煮豆腐", "萝卜牛腩", "酱油鸡", "胡椒猪肚鸡"};
//定义一个用来记录个列表项状态的boolean数组
checkItems = new boolean[]{false, false, false, false};
alert = null;
builder = new AlertDialog.Builder(mContext);
alert = builder.setIcon(R.mipmap.ic_icon_fish)
//多选列表
.setMultiChoiceItems(menu, checkItems, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
checkItems[which] = isChecked;
}
})
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String result = "";
for (int i = 0; i < checkItems.length; i++) {
if (checkItems[i])
result += menu[i] + " ";
}
Toast.makeText(getApplicationContext(), "客官你点了:" + result, Toast.LENGTH_SHORT).show();
}
})
.setCancelable(false)
.create();
alert.show();
break;
}
}
}
