Dialog初识

创建一个简单dialog,需要
1.创建Builder对象
2.设置icon title message setPositiveButton setNegativeButton
3.create->Alertdialaog对象
4. dialog.show();

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btnDelete.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //创建Builder对象                final AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);                //icon title message pisitvebutton negativebutton                builder.setIcon(R.mipmap.ic_launcher);                builder.setTitle("确认删除？");                builder.setMessage("真的删除吗");                // 设置确认按钮  参数 文字：onClick的方法                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        Toast.makeText(MainActivity.this,"删除",Toast.LENGTH_SHORT).show();                    }                });                //什么都不做的时候，第二个参数写null                builder.setNegativeButton("取消", null);                //create->Alertdialaog对象                AlertDialog dialog=builder.create();                //显示对话框                dialog.show();            }        });