04.AlertDiaLog实现对话框

private boolean[] checkedItems;//记录各列表项的状态
private String[] items;//各列表项要显示的内容

1. // 获取“显示带取消、确定按钮的对话框”按钮

Button button1 = (Button) findViewById(R.id.button1);
// 为“显示带取消、确定按钮的对话框”按钮添加单击事件监听器
button1.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //创建对话框对象
        AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
        alertDialog.setIcon(R.drawable.advise); //设置对话框的图标
        alertDialog.setTitle("乔布斯:");      //设置对话框的标题
        //设置要显示的内容
        alertDialog.setMessage("活着就是为了改变世界，难道还有其他原因吗？");
        //添加取消按钮
        alertDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "否",
                new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "您单击了否按钮",
                        Toast.LENGTH_SHORT).show();
            }
        });
        //添加确定按钮
        alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "是",
                new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "您单击了是按钮 ",
                        Toast.LENGTH_SHORT).show();
            }
        });
        alertDialog.show(); //显示对话框
    }
});

2. 显示带列表的对话框

Button button2 = (Button) findViewById(R.id.button2);  // 获取“显示带列表的对话框”按钮
button2.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //创建名言字符串数组
        final String[] items = new String[]{"当你有使命，它会让你更专注", "要么出众，"
                + "要么出局", "活着就是为了改变世界", "求知若饥，虚心若愚"};
        //创建列表对话框对象
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setIcon(R.drawable.advise1);                    //设置对话框的图标
        builder.setTitle("请选择你喜欢的名言：");            //设置对话框的标题
        //添加列表项
        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this,
                        "您选择了" + items[which], Toast.LENGTH_SHORT).show();

            }
        });
        builder.create().show();  // 创建对话框并显示
    }
});

3. 获取“显示带单选列表项的对话框”按钮

Button button3 = (Button) findViewById(R.id.button3);
button3.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //创建名字字符串数组
        final String[] items = new String[]{"扎克伯格", "乔布斯", "拉里.埃里森",
                "安迪.鲁宾", "马云"};
        // 显示带单选列表项的对话框
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setIcon(R.drawable.advise2);                      //设置对话框的图标
        builder.setTitle("如果让你选择，你最想做哪一个：");      //设置对话框的标题
        builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //显示选择结果
                Toast.makeText(MainActivity.this,
                        "您选择了" + items[which], Toast.LENGTH_SHORT).show();
            }
        });
        builder.setPositiveButton("确定", null);        //添加确定按钮
        builder.create().show();                         // 创建对话框并显示
    }
});

4. 获取“显示带多选列表项的对话框”按钮

Button button4 = (Button) findViewById(R.id.button4);
button4.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //记录各列表项的状态
        checkedItems = new boolean[]{false, true, false, true, false};
        //各列表项要显示的内容
        items = new String[]{"开心消消乐", "球球大作战", "欢乐斗地主",
                "梦幻西游", "超级玛丽"};
        // 显示带单选列表项的对话框
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setIcon(R.drawable.advise2);                 //设置对话框的图标
        builder.setTitle("请选择您喜爱的游戏：");           //设置对话框标题
        builder.setMultiChoiceItems(items, checkedItems,
                new DialogInterface.OnMultiChoiceClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                checkedItems[which] = isChecked;            //改变被操作列表项的状态

            }
        });
        //为对话框添加“确定”按钮
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                String result = "";
                for (int i = 0; i < checkedItems.length; i++) {
                    if (checkedItems[i]) {           //当选项被选择时
                        result += items[i] + "、";   //将选项的内容添加到result中
                    }
                }
                //当result不为空时，通过消息提示框显示选择的结果
                if (!"".equals(result)) {
                    //去掉最后面添加的“、”号
                    result = result.substring(0, result.length() - 1);
                    Toast.makeText(MainActivity.this,
                            "您选择了[ " + result + " ]", Toast.LENGTH_LONG).show();
                }

            }
        });
        builder.create().show();                                // 创建对话框并显示
    }
});