重写OnTouchListener，实现控件的移动

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/iv_my1"
            android:layout_width="0dp"
            android:layout_height="150dp"
            android:layout_weight="1"
            android:background="#000"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="10dp"
            android:layout_gravity="bottom"/>
        <ImageView
            android:id="@+id/iv_my2"
            android:layout_width="0dp"
            android:layout_height="150dp"
            android:layout_weight="1"
            android:background="#000"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="10dp"
            android:layout_gravity="bottom"/>
        <ImageView
            android:id="@+id/iv_my3"
            android:layout_width="0dp"
            android:layout_height="150dp"
            android:layout_weight="1"
            android:background="#000"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="10dp"
            android:layout_gravity="bottom"/>

        <ImageView
            android:id="@+id/iv_myhp"
            android:layout_width="40dp"
            android:layout_height="150dp"
            android:background="#000"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="10dp"
            android:layout_gravity="bottom"/>
    </LinearLayout>


</RelativeLayout>

上面是由四个ImageView组成的布局，其中我设定了三个可以滑动标记为iv_1/2/3

public class MainActivity extends AppCompatActivity {

    private ImageView iv_my1;
    private ImageView iv_my2;
    private ImageView iv_my3;
    private int screenHeightHalf;

    private int originalLeft, originalTop, originalRight, originalBottom;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        iniView();
        initData();

    }

    private void initData() {
        screenHeightHalf = getScreenHeightHalf(MainActivity.this);
    }

    private void iniView() {
        iv_my1 = (ImageView) findViewById(R.id.iv_my1);
        iv_my2 = (ImageView) findViewById(R.id.iv_my2);
        iv_my3 = (ImageView) findViewById(R.id.iv_my3);
        iv_my1.setOnTouchListener(touchListener);
        iv_my2.setOnTouchListener(touchListener);
        iv_my3.setOnTouchListener(touchListener);

    }

    private View.OnTouchListener touchListener = new View.OnTouchListener() {
        private int lastX, lastY;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    lastX = (int) event.getRawX();
                    lastY = (int) event.getRawY();
                    originalLeft = v.getLeft();
                    originalTop = v.getTop();
                    originalRight = v.getRight();
                    originalBottom = v.getBottom();
                    break;
                case MotionEvent.ACTION_MOVE:
                    //测试控件移动的位置
                    int top = v.getTop();
                    int screenHeight = screenHeightHalf * 2;
                    Log.d("TAG", "ImageView Top: " + top + ", Screen Height: " + screenHeight);

                    moveView(v, event.getRawX() - lastX, event.getRawY() - lastY);
                    lastX = (int) event.getRawX();
                    lastY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP:
                    switch (v.getId()){
                        case R.id.iv_my1:
                            Toast.makeText(MainActivity.this, "1", Toast.LENGTH_SHORT).show();
                            break;
                            case R.id.iv_my2:
                                Toast.makeText(MainActivity.this, "2", Toast.LENGTH_SHORT).show();
                                break;
                                case R.id.iv_my3:
                                    Toast.makeText(MainActivity.this, "3", Toast.LENGTH_SHORT).show();
                                    break;

                    }
                    // 处理抬起事件
                    /*if (v.getTop()<500) {
                        // 返回原始位置
                        //TODO
                        Toast.makeText(MainActivity.this, "超过1/2屏幕高度", Toast.LENGTH_SHORT).show();
                    }else {
                        v.layout(originalLeft, originalTop, originalRight, originalBottom);
                    }*/

                    break;
            }
            return true;
        }
    };

    private void moveView(View view, float dx, float dy) {
        int left = view.getLeft() + (int) dx;
        int top = view.getTop() + (int) dy;
        int right = view.getRight() + (int) dx;
        int bottom = view.getBottom() + (int) dy;
        view.layout(left, top, right, bottom);
    }



    public int getScreenHeightHalf(Context context) {
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        return displayMetrics.heightPixels / 2;
    }


}

其中getScreenHeightHalf方法是获取半屏的高度，可以在Logcat中显示控件的所处高度（由Log.d（）打印出）