android ContextMenu理解

先看图片:

就是长按ListView时,跳出一个选项列表.用到的就是ContextMenu .

直接上代码吧.

public class MainActivity extends Activity {

    private ListView mList;

private String mDatas[]={"1","2"};

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        mList =(ListView) findViewById(R.id.list);

        ArrayAdapter<String> adapter =new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, mDatas);

        mList.setAdapter(adapter);

        registerForContextMenu(mList);//register the context menu 

}

    

    // create context menu item .

@Override

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo)

{

 if (v ==mList) { //判断是哪个ListView

      menu.setHeaderTitle("hello")

.setHeaderIcon(R.drawable.icon);

menu.add(0, menu.FIRST, Menu.NONE, "Item 1");

menu.add(0, menu.FIRST+1, Menu.NONE, "Item 2");

 }

super.onCreateContextMenu(menu, v, menuInfo);

}

// the event when click menu item .

 

@Override

public boolean onContextItemSelected(MenuItem item)

{

switch (item.getItemId())

{

case 1:

Log.i("TAG","吃饭");

break;

case 2:

Log.i("TAG","睡觉");

break;

}

return true;

}

}