<AlertDialog>的简单用法与功能

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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.

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

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