android中提示&对话框----AlertDialog

AlertDialog（对话框）

一、对话框的基本使用流程

step1:创建AlertDialog.Buider;

step2:调用setIcon()设置图标，setTitle()或者setCustomerTitle设置标题

step3：设置对话框的内容setMessage()还有其他方式；

step4：setPosition/Negative/NaturalButton设置：确定、取消、中立

step5：调用create()方法创建这个对象，在调用show()方法将对话框显示出来

二、几种常用的对话框已经自定义view的对话框使用实例

package com.example.test3;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements View.OnClickListener{
    private Button btn1;
    private Button btn2;
    private Button btn3;
    private Button btn4;
    private Button btn5;
    private AlertDialog.Builder builder;
    private AlertDialog alertDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1 = (Button) findViewById(R.id.btn1);
        btn2 = (Button) findViewById(R.id.btn2);
        btn3 = (Button) findViewById(R.id.btn3);
        btn4 = (Button) findViewById(R.id.btn4);
        btn5 = (Button) findViewById(R.id.btn5);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
        btn4.setOnClickListener(this);
        btn5.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        switch (view.getId()){
            case R.id.btn1:{
                builder = new AlertDialog.Builder(MainActivity.this);
                alertDialog = builder.setIcon(R.mipmap.ic_launcher)
                        .setTitle("系统提示:")
                        .setMessage("这是一个最普通AlertDialog，\n带有三个按钮，分别是取消、确定、中立")
                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                            }
                        })
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                            }
                        })
                        .setNeutralButton("中立", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                            }
                        }).create();
                alertDialog.show();
                break;
            }
            case R.id.btn2:{
                final String[] lesson = new String[]{"语文", "数学", "英语", "化学", "生物", "物理", "体育"};
                builder = new AlertDialog.Builder(MainActivity.this);
                alertDialog= builder.setIcon(R.mipmap.ic_launcher)
                        .setTitle("选择你喜欢的课程")
                        .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();
                alertDialog.show();
                break;
            }
            case R.id.btn3:{
                final String[] fruits = new String[]{"苹果", "雪梨", "香蕉", "葡萄", "西瓜"};
                builder = new AlertDialog.Builder(MainActivity.this);
                alertDialog = builder.setIcon(R.mipmap.ic_launcher)
                        .setTitle("选择你喜欢的水果，只能选一个哦~")
                        .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();
                alertDialog.show();
                break;
            }
            case R.id.btn4:{
                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
                final boolean[] checkItems = new boolean[]{false, false, false, false};
                builder = new AlertDialog.Builder(MainActivity.this);
                alertDialog = builder.setIcon(R.mipmap.ic_launcher)
                        .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();
                            }
                        })
                        .create();
                alertDialog.show();
                break;
            }
            case R.id.btn5:{
                builder = new AlertDialog.Builder(MainActivity.this);
                View view1 = getLayoutInflater().inflate(R.layout.view_dialog,null);
                builder.setView(view1);
                alertDialog = builder.create();
                alertDialog.show();
                Button btn1 = (Button) view1.findViewById(R.id.btn_cancle);
                Button btn2 = (Button) view1.findViewById(R.id.btn_blog);
                Button btn3 = (Button) view1.findViewById(R.id.btn_close);
                btn1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        alertDialog.dismiss();
                    }
                });
                btn2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        alertDialog.dismiss();
                    }
                });
                btn3.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        alertDialog.dismiss();
                    }
                });
                break;
            }
        }
    }
}

效果图