Android——AlertDialog的使用

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目录

• 一般使用
• 普通列表
• 单选列表
• 多选列表
• 自定义弹出框

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一般使用

 //构造AlertDialog.Builder对象
AlertDialog.Builder defaultBuilder = new AlertDialog.Builder(MainActivity.this);

//调用setTitle、setMessage、setIcon等方法构造对话框的标题、信息和图标等内容；
//标题
defaultBuilder.setTitle("默认样式");
//提示信息
defaultBuilder.setMessage("这是什么样式？");
//调用setPositive/Negative/NeutralButton()方法设置选项 有正面按钮、负面按钮、中立按钮；

//正面按钮 第一个参数提示信息 第二个参数实现监听接口
defaultBuilder.setPositiveButton("默认样式",new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,"选对了",Toast.LENGTH_SHORT).show();
    }
});

//负面按钮
defaultBuilder.setNegativeButton("多选样式", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,"选错了",Toast.LENGTH_SHORT).show();
    }
});

//中立按钮
defaultBuilder.setNeutralButton("我再想想", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,"那你再想想",Toast.LENGTH_SHORT).show();
    }
});


//显示
defaultBuilder.show();

---

普通列表

//列表
AlertDialog.Builder tableBuilder = new AlertDialog.Builder(MainActivity.this);
final String[] course = {"C++","Java","Go","php","Pyhton"};
tableBuilder.setTitle("你喜欢那个语言？");
tableBuilder.setItems(course, new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,course[which],Toast.LENGTH_SHORT).show();
    }
});
tableBuilder.show();

---

单选列表

final String[] sex = {"男","女"};
AlertDialog.Builder singleBuilder = new AlertDialog.Builder(MainActivity.this);
singleBuilder.setTitle("请选择性别");
//setSingleChoiceItems 单选
//只能选中一个  第二个参数是默认选中哪一个
singleBuilder.setSingleChoiceItems(sex,0, new DialogInterface.OnClickListener() {
    //第二个参数代表选中那个下标的返回值
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,sex[which],Toast.LENGTH_SHORT).show();
        dialog.dismiss();//关闭对话框
    }
});

singleBuilder.show();

---

多选列表

final String[] book = {"从删库到跑路","深入理解计算机系学生秃头的原因","程序员的构造和解释","算法导论论不懂","计算机网络联不通"};
boolean[] begin = {false,false,false,false,false};//初始状态为全部不选中
ArrayList<String> bookList = new ArrayList<String>();
AlertDialog.Builder multipleAlertDialog = new AlertDialog.Builder(MainActivity.this);
multipleAlertDialog.setTitle("想要读什么？");
//setMultiChoiceItems 多选
multipleAlertDialog.setMultiChoiceItems(book, begin, new DialogInterface.OnMultiChoiceClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {

        if(isChecked){
            bookList.add(book[which]);
            Toast.makeText(MainActivity.this,"任意选中就true",Toast.LENGTH_SHORT).show();
        }else {
            Toast.makeText(MainActivity.this,"任意取消就false",Toast.LENGTH_SHORT).show();
            bookList.remove(book[which]);
        }

        //Toast.makeText(MainActivity.this,book[which],Toast.LENGTH_SHORT).show();
    }
});
multipleAlertDialog.setPositiveButton("选好了", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,bookList.toString(),Toast.LENGTH_SHORT).show();
    }
});
multipleAlertDialog.setNeutralButton("取消", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,"不准备读一读吗？",Toast.LENGTH_SHORT).show();
    }
});
multipleAlertDialog.show();

---

自定义弹出框

定义对话框布局

<?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="match_parent"
    android:background="#FFFFFFFF"
    android:orientation="vertical">

    <TextView

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="标题"
        android:textSize="30sp"
        android:textColor="#000"
        android:layout_marginTop="20dp"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="自定义的AlertDialog"
        android:textSize="20sp"
        android:textColor="#000"
        android:layout_marginTop="20dp"
        />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginTop="20dp"
        android:background="#414E5E"
        />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="取消"
            android:backgroundTint="#F8F3F3"
            android:textColor="#0781B8"
            android:textSize="20sp"
            android:layout_height="wrap_content" />

        <View
            android:layout_width="1dp"
            android:background="#E4E5E6"
            android:layout_height="match_parent" />
        <Button
            android:id="@+id/btn_save"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:backgroundTint="#F8F3F3"
            android:text="保存"
            android:textColor="#0781B8"
            android:textSize="20sp"
            android:layout_height="wrap_content" />
    </LinearLayout>

</LinearLayout>

设置布局到对话框

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
//先创建AlertDialog对象
AlertDialog dialog = builder.create();

//初始化view
View dialogView = LayoutInflater.from(MainActivity.this).inflate(R.layout.alertdialog_custom,null);

//设置弹出页面 为自定义布局
dialog.setView(dialogView);
dialog.show();


//剩下的当成正常页面操作

Button btnCancel,btnSave;
btnCancel = dialogView.findViewById(R.id.btn_cancel);
btnSave = dialogView.findViewById(R.id.btn_save);

btnCancel.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Toast.makeText(MainActivity.this,"你选择了取消",Toast.LENGTH_SHORT).show();
        dialog.dismiss();//关闭对话框
    }
});

btnSave.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Toast.makeText(MainActivity.this,"你选择了保存",Toast.LENGTH_SHORT).show();
        dialog.dismiss();
    }
});

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