Android之PopupWindow+ListView+在item顶部底部跳跃

在PopupWindow中添加列表在开发中还是比较常见的应用，在列表中的item底部和顶部的跳跃，在遥控设备上应用理广泛(如STB)。故有此例，备忘。

public class TestPopupWindow extends Activity {
	private ListView listView;
	private PopupWindow popupWindow;
	private TextView textView;
	private Button myButton;
	private String[] name;
	private int iFirstOrLastItemSelected;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		myButton = (Button) findViewById(R.id.button);
		//从string中获取字符数组
		name = getResources().getStringArray(R.array.name_one);
		//监听按钮
		myButton.setOnClickListener(new Button.OnClickListener() {
			@Override
			public void onClick(View arg0) {
				initPopWindow();
			}
		});
	}

	private void initPopWindow() {
		//得到PopupWindow的布局
		View contentView = LayoutInflater.from(getApplicationContext())
				.inflate(R.layout.popupwindow, null);
		contentView.setBackgroundColor(Color.DKGRAY);
		//设置PopWindow的宽高
		popupWindow = new PopupWindow(findViewById(R.id.mainLayout), 400, 500);
		popupWindow.setContentView(contentView);

		textView = (TextView) contentView.findViewById(R.id.text);
		textView.setText("Test");

		listView = (ListView) contentView.findViewById(R.id.list);
		//向adapter装载数据
		ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, name);
		listView.setAdapter(adapter);
		if (popupWindow != null) {
			popupWindow.dismiss();
		}

		popupWindow.setFocusable(true);
		//显示PopupWindow
		popupWindow.showAsDropDown(contentView);
		//监听PopupWindow中的选中(高亮)的item
		listView.setOnItemSelectedListener(itemSelectedListener);
		//监听键盘按键
		listView.setOnKeyListener(popuWindowListener);
		//监听并响应所点击的item
		listView.setOnItemClickListener(clickListener);
	}

	OnItemClickListener clickListener = new OnItemClickListener() {

		@Override
		public void onItemClick(AdapterView arg0, View arg1, int arg2, long arg3) {
			//在此可实现响应item被点击后的功能
			popupWindow.dismiss();
		}
	};
	OnItemSelectedListener itemSelectedListener = new OnItemSelectedListener() {

		public void onItemSelected(AdapterView parent, View view, int position, long id) {
			iFirstOrLastItemSelected = position;
		}

		public void onNothingSelected(AdapterView parent) {

		}

	};

	private OnKeyListener popuWindowListener = new OnKeyListener() {

		@Override
		public boolean onKey(View v, int keyCode, KeyEvent event) {
			if (event.getAction() == KeyEvent.ACTION_DOWN) {
				switch (keyCode) {
				case KeyEvent.KEYCODE_DPAD_UP:
					if (iFirstOrLastItemSelected == 0) {
						listView.setSelection(name.length - 1);
					}
					break;

				case KeyEvent.KEYCODE_DPAD_DOWN:
					if (iFirstOrLastItemSelected == name.length - 1) {
						listView.setSelection(0);
					}
					break;
				}
			}

			return false;
		}

	};
}

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