我想缩放 SurfaceView 以便我们也可以使用视频播放器和相机。我搜索了很多，但没有找到任何合适的指南。很多问题都与此相关，但我没有找到合适的解决方案。实际上，我们使用捏缩放Matrix 但问题是 SurfaceView 不支持 Matrix.so 任何人都可以建议我如何做到这一点。我通过 this 进行了PinchZoom。
您的正确指南将不胜感激。谢谢
最佳答案
您可以正确设置 MarginLayoutParams。详情见下方源代码
/**
* sonle.evizi
*/
package com.philips.cl.insight;
import android.graphics.PointF;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.FrameLayout;
public class PanAndZoomListener1 implements OnTouchListener {
private enum Anchor {
NONE, LEFT, TOP, RIGHT, BOTTOM, LEFT_TOP, TOP_RIGHT, RIGHT_BOTTOM, LEFT_BOTTOM
}
private static final float SPACE_ZOOM = 10f;
private static final float SPACE_DRAG = 5f;
private static final float ZOOM_MAX = 8f;
private static final String TAG = "PanAndZoomListener";
// We can be in one of these 3 states
static final int CLICK = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
static final int NONE = 3;
int mode = NONE;
// Remember some things for zooming
PointF start = new PointF();
PointF midPoint = new PointF();
float oldDist = 1f;
MarginLayoutParams oldParams;
LiveStreamingActivity liveStreamingActivity;
View parentView;
View child;
public PanAndZoomListener1(FrameLayout containter, View surfaceView,
LiveStreamingActivity liveStreamingActivity) {
this.liveStreamingActivity = liveStreamingActivity;
this.parentView = containter;
this.child = surfaceView;
}
public boolean onTouch(View view, MotionEvent event) {
// Handle touch events here...
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
initDragInfo(view, event);
Log.i(TAG, "======ACTION_DOWN - CLICK ======" + event.getActionIndex());
mode = CLICK;
break;
case MotionEvent.ACTION_POINTER_DOWN:
Log.i(TAG, "======ACTION_POINTER_1_DOWN======");
oldDist = spacing(event.getX(0), event.getY(0), event.getX(1), event.getY(1));
Log.i(TAG, "========oldDist:" + oldDist + "=========");
if (oldDist < SPACE_ZOOM) {
mode = NONE;
} else {
mode = ZOOM;
initZoomInfo(view, event);
}
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
case MotionEvent.ACTION_UP:
Log.i(TAG, "ACTION_UP");
if (mode == CLICK) {
Log.i(TAG, "mode= onTouchDitect");
liveStreamingActivity.onTouchDitect();
}
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
if (mode == CLICK) {
if (spacing(start.x, start.y, event.getRawX(), event.getRawY()) >= SPACE_DRAG) {
mode = DRAG;
} else {
Log.i(TAG, "======ACTION_MOVE - CLICK======");
break;
}
}
if (mode == DRAG) {
Log.i(TAG, "======ACTION_MOVE - DRAG======");
doPan(event.getRawX() - start.x, event.getRawY() - start.y);
break;
}
if (mode == ZOOM) {
Log.i(TAG, "======ACTION_MOVE - ZOOM======");
float newDist = spacing(event.getX(0), event.getY(0), event.getX(1), event.getY(1));
if (newDist >= SPACE_ZOOM) {
doZoom(newDist);
}
}
break;
}
return true; // indicate event was handled
}
private void initDragInfo(View view, MotionEvent event) {
start.set(event.getRawX(), event.getRawY());
// Initialize start motion info
oldParams = new MarginLayoutParams((MarginLayoutParams) child.getLayoutParams());
oldParams.width = child.getWidth();
oldParams.height = child.getHeight();
}
// Caculate the space between two points
private float spacing(float x0, float y0, float x1, float y1) {
float x = x0 - x1;
float y = y0 - y1;
return (float) Math.sqrt(x * x + y * y);
}
// Calculate the mid point of the first two fingers
private void initZoomInfo(View view, MotionEvent event) {
midPoint.set((event.getX(0) + event.getX(1)) / 2, (event.getY(0) + event.getY(1)) / 2);
// Initialize start motion info
oldParams = new MarginLayoutParams((MarginLayoutParams) child.getLayoutParams());
oldParams.width = child.getWidth();
oldParams.height = child.getHeight();
}
public void doZoom(float newDist) {
Anchor anchor = Anchor.NONE;
/*
Log.i(TAG, "=======MID POINT: " + midPoint.x + "; " + midPoint.y + "============");
Log.i(TAG, "=======CHILD VIEW WIDTH: " + child.getWidth() + "============");
*/
MarginLayoutParams childParams = (MarginLayoutParams) child.getLayoutParams();
// Log.i(TAG, "=======CHILD VIEW LEFT MARGIN: " + childParams.leftMargin + "============");
float scale = newDist / oldDist;
int oriWidth = parentView.getWidth();
int oriHeight = parentView.getHeight();
float tempWidth = oldParams.width * scale;
float tempHeight = tempWidth * oriHeight / oriWidth;
if (tempWidth < oriWidth || tempWidth > oriWidth * ZOOM_MAX) {
return;
}
childParams.width = (int) tempWidth;
childParams.height = (int) tempHeight;
float x1 = midPoint.x + oldParams.leftMargin;
float x2 = oriWidth - x1;
float y1 = midPoint.y + oldParams.topMargin;
float y2 = oriHeight - y1;
if (midPoint.x * scale <= x1) {
anchor = Anchor.LEFT;
} else if ((oldParams.width - midPoint.x) * scale <= x2) {
anchor = Anchor.RIGHT;
}
if (midPoint.y * scale <= y1) {
if (anchor == Anchor.LEFT) {
anchor = Anchor.LEFT_TOP;
} else if (anchor == Anchor.RIGHT) {
anchor = Anchor.TOP_RIGHT;
} else {
anchor = Anchor.TOP;
}
} else if ((oldParams.height - midPoint.y) * scale <= y2) {
if (anchor == Anchor.LEFT) {
anchor = Anchor.LEFT_BOTTOM;
} else if (anchor == Anchor.RIGHT) {
anchor = Anchor.RIGHT_BOTTOM;
} else {
anchor = Anchor.BOTTOM;
}
}
switch (anchor) {
case BOTTOM:
childParams.leftMargin = (int) (x1 - midPoint.x * scale);
childParams.topMargin = (int) (oriHeight - tempHeight);
break;
case LEFT:
childParams.leftMargin = 0;
childParams.topMargin = (int) (y1 - midPoint.y * scale);
break;
case LEFT_BOTTOM:
childParams.leftMargin = 0;
childParams.topMargin = (int) (oriHeight - tempHeight);
break;
case LEFT_TOP:
childParams.leftMargin = 0;
childParams.topMargin = 0;
break;
case NONE:
childParams.leftMargin = (int) (x1 - midPoint.x * scale);
childParams.topMargin = (int) (y1 - midPoint.y * scale);
break;
case RIGHT:
childParams.leftMargin = (int) (oriWidth - tempWidth);
childParams.topMargin = (int) (y1 - midPoint.y * scale);
break;
case RIGHT_BOTTOM:
childParams.leftMargin = (int) (oriWidth - tempWidth);
childParams.topMargin = (int) (oriHeight - tempHeight);
break;
case TOP:
childParams.leftMargin = (int) (x1 - midPoint.x * scale);
childParams.topMargin = 0;
break;
case TOP_RIGHT:
childParams.topMargin = 0;
childParams.leftMargin = (int) (oriWidth - tempWidth);
break;
default:
break;
}
child.setLayoutParams(childParams);
}
public void doPan(float panX, float panY) {
Anchor anchor = Anchor.NONE;
MarginLayoutParams childParams = (MarginLayoutParams) child.getLayoutParams();
if (oldParams.width <= parentView.getWidth()) {
return;
}
if (oldParams.leftMargin + panX >= 0) {
anchor = Anchor.LEFT;
} else if (oldParams.leftMargin + panX + oldParams.width <= parentView.getWidth()) {
anchor = Anchor.RIGHT;
}
if (oldParams.topMargin + panY >= 0) {
if (anchor == Anchor.LEFT) {
anchor = Anchor.LEFT_TOP;
} else if (anchor == Anchor.RIGHT) {
anchor = Anchor.TOP_RIGHT;
} else {
anchor = Anchor.TOP;
}
} else if (oldParams.topMargin + panY + oldParams.height <= parentView.getHeight()) {
if (anchor == Anchor.LEFT) {
anchor = Anchor.LEFT_BOTTOM;
} else if (anchor == Anchor.RIGHT) {
anchor = Anchor.RIGHT_BOTTOM;
} else {
anchor = Anchor.BOTTOM;
}
}
switch (anchor) {
case BOTTOM:
case TOP:
childParams.leftMargin = (int) (oldParams.leftMargin + panX);
break;
case LEFT:
case RIGHT:
childParams.topMargin = (int) (oldParams.topMargin + panY);
break;
case NONE:
childParams.topMargin = (int) (oldParams.topMargin + panY);
childParams.leftMargin = (int) (oldParams.leftMargin + panX);
break;
case LEFT_BOTTOM:
case LEFT_TOP:
case RIGHT_BOTTOM:
case TOP_RIGHT:
break;
default:
break;
}
child.setLayoutParams(childParams);
}
}
关于android - 使用 Android SurfaceView 捏缩放效果，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16121145/