第五周笔记

图片发自App

1. Radiobutton（单选）

以组的方式管理

 若要多选一需要放置一个Radiogroup

定义变量

private RadioGroup rGroup;

private static TextView tView;

赋值

rGroup=(RadioGroup) findViewById(R.id.radiogroup1);

       tView=(TextView) findViewById(R.id.textview1);

用匿名内部类的方法监听

rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup arg0, int arg1) {

// TODO Auto-generated method stub

switch(arg1)

{

case R.id.radiobutton1:  tView.setText("男被选中");break;

case R.id.radiobutton2:  tView.setText("女被选中");

}

显示组件 listview

定义变量

private ListView lView;

获取组件

lView=(ListView) findViewById(R.id.listview1);

生成数据源

String data[]={"苹果","三星","华为","小米","火腿肠"};

将数据源封装到适配器中

ArrayAdapter arrayAdapter =new ArrayAdapter(this,android.R.layout.simple_list_item_1,data);

将适配器绑定给列表控件

lView.setAdapter(arrayAdapter);

lView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override

public void onItemClick(AdapterView arg0, View arg1, int arg2,

long arg3) {

// TODO Auto-generated method stub

String msg=data[arg2];

Toast.makeText(MainActivity.this,msg,4000).show();

}

});

   }

图片发自App