走进安卓[2]

Button button1 = (Button) findViewById(R.id.button1);  button1.setOnClickListener(new OnClickListener() {                         public void onClick(View v) {             AlertDialog.Builder builder= new AlertDialog.Builder(MainActivity.this);                builder.setIcon(android.R.drawable.ic_dialog_info);                builder.setTitle("title");//标题                builder.setMessage("msg");//内容                builder.setPositiveButton("确认", null);//方式                builder.create().show();                                          System.out.println("您点击了Button1");              }          });