基于SurfaceView实现可拖动视频控件
本文实例为大家分享了基于SurfaceView的可拖动视频控件,供大家参考,具体内容如下
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public class DragSurfaceView extends SurfaceView implements View.OnTouchListener { protected int screenWidth; protected int screenHeight; protected int lastX; protected int lastY; private int oriLeft; private int oriRight; private int oriTop; private int oriBottom; private int dragDirection; private static final int TOP = 0x15; private static final int LEFT = 0x16; private static final int BOTTOM = 0x17; private static final int RIGHT = 0x18; private static final int LEFT_TOP = 0x11; private static final int RIGHT_TOP = 0x12; private static final int LEFT_BOTTOM = 0x13; private static final int RIGHT_BOTTOM = 0x14; private static final int CENTER = 0x19; private int offset = 20; /** * 初始化获取屏幕宽高 */ protected void initScreenW_H() { screenHeight = getResources().getDisplayMetrics().heightPixels - 40; screenWidth = getResources().getDisplayMetrics().widthPixels; Log.i("DragViewTAG", "DragSurfaceView.initScreenW_H: screenWidth="+screenWidth+", screenHeight="+screenHeight); } public DragSurfaceView(Context context) { super(context); setOnTouchListener(this); initScreenW_H(); } public DragSurfaceView(Context context, AttributeSet attrs) { super(context, attrs); setOnTouchListener(this); initScreenW_H(); } public DragSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); setOnTouchListener(this); initScreenW_H(); } @Override public boolean onTouch(View v, MotionEvent event) { int action = event.getAction(); if (action == MotionEvent.ACTION_DOWN) { oriLeft = v.getLeft(); oriRight = v.getRight(); oriTop = v.getTop(); oriBottom = v.getBottom(); lastY = (int) event.getRawY(); lastX = (int) event.getRawX(); dragDirection = getDirection(v, (int) event.getX(), (int) event.getY()); } // 处理拖动事件 delDrag(v, event, action); if(action==MotionEvent.ACTION_UP){ dragDirection=0; } invalidate(); return true; } /** * 获取触摸点flag * * @param v * @param x * @param y * @return */ protected int getDirection(View v, int x, int y) { int left = v.getLeft(); int right = v.getRight(); int bottom = v.getBottom(); int top = v.getTop(); if (x < 40 && y < 40) { return LEFT_TOP; } if (y < 40 && right - left - x < 40) { return RIGHT_TOP; } if (x < 40 && bottom - top - y < 40) { return LEFT_BOTTOM; } if (right - left - x < 40 && bottom - top - y < 40) { return RIGHT_BOTTOM; } if (x < 40) { return LEFT; } if (y < 40) { return TOP; } if (right - left - x < 40) { return RIGHT; } if (bottom - top - y < 40) { return BOTTOM; } return CENTER; } /** * 处理拖动事件 * * @param v * @param event * @param action */ protected void delDrag(View v, MotionEvent event, int action) { switch (action) { case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - lastX; int dy = (int) event.getRawY() - lastY; switch (dragDirection) { case LEFT: // 左边缘 left(v, dx); break; case RIGHT: // 右边缘 right(v, dx); break; case BOTTOM: // 下边缘 bottom(v, dy); break; case TOP: // 上边缘 top(v, dy); break; case CENTER: // 点击中心-->>移动 center(v, dx, dy); break; case LEFT_BOTTOM: // 左下 left(v, dx); bottom(v, dy); break; case LEFT_TOP: // 左上 left(v, dx); top(v, dy); break; case RIGHT_BOTTOM: // 右下 right(v, dx); bottom(v, dy); break; case RIGHT_TOP: // 右上 right(v, dx); top(v, dy); break; default: break; } v.layout(oriLeft, oriTop, oriRight, oriBottom); // if (dragDirection != CENTER) { // v.layout(oriLeft, oriTop, oriRight, oriBottom); // } lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); Log.i("DragViewTAG", "DragSurfaceView.delDrag:ACTION_MOVE direction="+dragDirection+", left="+oriLeft+", top="+oriTop+", right="+oriRight+", bottom="+oriBottom); break; case MotionEvent.ACTION_UP: ViewGroup.LayoutParams newLayoutParams = getNewLayoutParams(); if(newLayoutParams!=null){ Log.i("DragViewTAG", "DragSurfaceView.delDrag:ACTION_UP width="+newLayoutParams.width+", height="+newLayoutParams.height); setLayoutParams(newLayoutParams); }else { Log.e("DragViewTAG", "DragSurfaceView.delDrag: 父组件类型?"); v.layout(oriLeft, oriTop, oriRight, oriBottom); } break; default: break; } } private ViewGroup.LayoutParams getNewLayoutParams(){ if(getLayoutParams() instanceof RelativeLayout.LayoutParams){ RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams)getLayoutParams( ); lp.leftMargin = oriLeft; lp.topMargin = oriTop; lp.width = oriRight-oriLeft; lp.height = oriBottom-oriTop; return lp; }else if(getLayoutParams() instanceof FrameLayout.LayoutParams) { FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) getLayoutParams(); lp.leftMargin = oriLeft; lp.topMargin = oriTop; lp.width = oriRight - oriLeft; lp.height = oriBottom - oriTop; return lp; } return null; } /** * 触摸点为中心->>移动 * * @param v * @param dx * @param dy */ private void center(View v, int dx, int dy) { oriLeft += dx; oriTop += dy; oriRight += dx; oriBottom += dy; Log.i("DragViewTAG", "DragSurfaceView.center: v.left="+v.getLeft()+", v.top="+v.getTop()); if (oriLeft < -offset) { Log.e("DragViewTAG", "DragSurfaceView.center: 左侧越界, left="+oriLeft+", offset="+offset); oriLeft = -offset; oriRight = oriLeft + v.getWidth(); } if (oriRight > screenWidth + offset) { Log.e("DragViewTAG", "DragSurfaceView.center: 右侧越界, right="+oriRight+", screenWidth="+screenWidth+", offset="+offset); oriRight = screenWidth + offset; oriLeft = oriRight - v.getWidth(); } if (oriTop < -offset) { Log.e("DragViewTAG", "DragSurfaceView.center: 顶部越界, top="+oriTop+", offset="+offset); oriTop = -offset; oriBottom = oriTop + v.getHeight(); } if (oriBottom > screenHeight + offset) { Log.e("DragViewTAG", "DragSurfaceView.center: 底部越界, bottom="+oriBottom+", screenHeight="+screenHeight+", offset="+offset); oriBottom = screenHeight + offset; oriTop = oriBottom - v.getHeight(); } // v.layout(left, top, right, bottom); } /** * 触摸点为上边缘 * * @param v * @param dy */ private void top(View v, int dy) { oriTop += dy; if (oriTop < -offset) { oriTop = -offset; } if (oriBottom - oriTop - 2 * offset < 200) { oriTop = oriBottom - 2 * offset - 200; } } /** * 触摸点为下边缘 * * @param v * @param dy */ private void bottom(View v, int dy) { oriBottom += dy; if (oriBottom > screenHeight + offset) { oriBottom = screenHeight + offset; } if (oriBottom - oriTop - 2 * offset < 200) { oriBottom = 200 + oriTop + 2 * offset; } } /** * 触摸点为右边缘 * * @param v * @param dx */ private void right(View v, int dx) { oriRight += dx; if (oriRight > screenWidth + offset) { oriRight = screenWidth + offset; } if (oriRight - oriLeft - 2 * offset < 200) { oriRight = oriLeft + 2 * offset + 200; } } /** * 触摸点为左边缘 * * @param v * @param dx */ private void left(View v, int dx) { oriLeft += dx; if (oriLeft < -offset) { oriLeft = -offset; } if (oriRight - oriLeft - 2 * offset < 200) { oriLeft = oriRight - 2 * offset - 200; } } /** * 获取截取宽度 * * @return */ public int getCutWidth() { return getWidth() - 2 * offset; } /** * 获取截取高度 * * @return */ public int getCutHeight() { return getHeight() - 2 * offset; } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
本文标题:基于SurfaceView实现可拖动视频控件
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