在同一活动中显示警报对话框

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("警告")
       .setMessage("确定要删除吗？")
       .setIcon(R.drawable.warning_icon)
       .setPositiveButton("确定", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // 执行删除操作
           }
       })
       .setNegativeButton("取消", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // 取消删除操作
           }
       });
AlertDialog dialog = builder.create();
dialog.show();