有哪位大神知道怎样在Fragment里做个可拖动的控件

一杯酒几分愁 2017-08-25 11:42:49

这是我之前做的，可移动区域就只有这么点是什么原因要怎么改啊

我的imageview控件代码是这样的

@TargetApi(Build.VERSION_CODES.HONEYCOMB) public class FragmentMsg extends Fragment implements

		View.OnClickListener{

	private boolean clickormove = true;//点击或拖动，点击为true，拖动为false

	private int downX, downY;//按下时的X，Y坐标

	private boolean hasMeasured = false;//ViewTree是否已被测量过，是为true，否为false

	private View content;//界面的ViewTree

	private int screenWidth,screenHeight;//ViewTree的宽和高

        private ImageView msg_fabu ;//可拖动按钮

	@Nullable @Override

	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

		View view=inflater.inflate(R.layout.fragment_msg,container,false);

		intent=new Intent(getActivity(), FBSCActivityNew.class);

		intent.putExtra("info", "f");

		initView(view);

		onClick();



        content = getActivity().getWindow().findViewById(Window.ID_ANDROID_CONTENT);//获取界面的ViewTree根节点View

		DisplayMetrics dm = getResources().getDisplayMetrics();//获取显示屏属性

		screenWidth = dm.widthPixels;

		screenHeight = dm.heightPixels;

		ViewTreeObserver vto = content.getViewTreeObserver();//获取ViewTree的监听器

		vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {

			@Override

			public boolean onPreDraw() {

// TODO Auto-generated method stub

				if(!hasMeasured)

				{

					screenHeight = content.getMeasuredHeight();//获取ViewTree的高度

					hasMeasured = true;//设置为true，使其不再被测量。

				}

				return true;//如果返回false，界面将为空。

			}

		});

//		msg_fabu = (Button) view.findViewById(R.id.msg_fabu);

		msg_fabu.setOnTouchListener(new View.OnTouchListener() {//设置按钮被触摸的时间

			int lastX, lastY; // 记录移动的最后的位置

			@Override

			public boolean onTouch(View v, MotionEvent event) {

// TODO Auto-generated method stub

				int ea = event.getAction();//获取事件类型

				switch (ea) {

					case MotionEvent.ACTION_DOWN: // 按下事件

						lastX = (int) event.getRawX();

						lastY = (int) event.getRawY();

						downX = lastX;

						downY = lastY;

						break;

					case MotionEvent.ACTION_MOVE: // 拖动事件

// 移动中动态设置位置

						int dx = (int) event.getRawX() - lastX;//位移量X

						int dy = (int) event.getRawY() - lastY;//位移量Y

						int left = v.getLeft() + dx;

						int top = v.getTop() + dy;

						int right = v.getRight() + dx;

						int bottom = v.getBottom() + dy;

//++限定按钮被拖动的范围

						if (left < 0) {

							left = 0;

							right = left + v.getWidth();

						}

						if (right > screenWidth) {

							right = screenWidth;

							left = right - v.getWidth();

						}

						if (top < 0) {

							top = 0;

							bottom = top + v.getHeight();

						}

						if (bottom > screenHeight) {

							bottom = screenHeight;

							top = bottom - v.getHeight();

						}

//--限定按钮被拖动的范围

						v.layout(left, top, right, bottom);//按钮重画



// 记录当前的位置

						lastX = (int) event.getRawX();

						lastY = (int) event.getRawY();

						break;

					case MotionEvent.ACTION_UP: // 弹起事件

						//判断是单击事件或是拖动事件，位移量大于5则断定为拖动事件

						if (Math.abs((int) (event.getRawX() - downX)) > 5

							|| Math.abs((int) (event.getRawY() - downY)) > 5)

							clickormove = false;

						else

							clickormove = true;

						break;

				}

				return false;

			}

		});

｝