1.默认样式

 new AlertDialog.Builder(activity)                .setTitle("title")                .setMessage("message?")                //点击边缘弹窗是否会消失                .setCancelable(false)                .setPositiveButton("Positive", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                    }                })                .setNeutralButton("Neutral", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialogInterface, int i) {                    }                })                .setNegativeButton("Negative", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                    }                })                .show();

2.单选，不同样式

 final String[] data = new String[]{"数据1", "数据2"};        new AlertDialog.Builder(activity)                .setTitle("请选择")                .setItems(gender, new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                    }                }).show();        new AlertDialog.Builder(activity)                .setTitle("请选择")                .setSingleChoiceItems(gender, 1, new DialogInterface.OnClickListener() {              (tbc是什么意思？游戏魔兽世界的“燃烧的远征（World of Warcraft: The Burning Crusade），未完待续 （To Be Continued），对叔丁基邻苯二酚（p-tert-butylcatechol），简称TBC；波音公司（The Boeing Company）。)      @Override                    public void onClick(DialogInterface dialog, int which) {                    }                }).show();

3.多选框

String[] data = new String[]{"数据1","数据2","数据3","数据4"};boolean[] begin = new boolean[]{false,false,false,false};new AlertDialog.Builder(activity)        .setTitle("请选择")        .setMultiChoiceItems(dessert, begin, new DialogInterface.OnMultiChoiceClickListener() {            @Override            public void onClick(DialogInterface dialog, int which, boolean isChecked) {            }        })       .setPositiveButton("确认", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {            }        })        .setNegativeButton("取消", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {            }        }).show();

4.自定义弹窗

AlertDialog mDialog = new AlertDialog.Builder(this).create();View view = getLayoutInflater().inflate(R.layout.dialog, null);Objects.requireNonNull(mDialog.getWindow()).setBackgroundDrawableResource(android.R.color.transparent);mDialog.setView(view);mDialog.setCancelable(true);mDialog.show();view.findViewById(R.id.im_btn).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //点击事件要做的事情                mDialog.dismiss();            }        });


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