Android(安卓)自定义控件之图片裁剪
16lz
2021-12-04
package view;import java.util.ArrayList;import java.util.List;import util.SystemUtil;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Rect;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import com.example.cropimageview.R;public final class ViewfinderView extends View { private Paint paint; private Paint tipPaint; private Rect frame;// 保存透明窗的边界 private int frameWidth;// 保存透明窗的宽 private int frameHeight;// 保存透明窗的高 private Rect bitmapRect;// 保存bitmap的边界 private int width;// 屏幕宽 private int height;// 屏幕高 private Bitmap bitmap;// 需要截取的图片 private int bitmapWidth;// 图片的宽 private int bitmapHeight;// 图片的高 private int downX;// 按下时的x private int downY;// 按下时的y private boolean touchInFrame = false;// 触摸是否发生在透明窗 private boolean touchFrameLeft = false;// 是否触摸左边界 private boolean touchFrameTop = false;// 是否触摸上边界 private boolean touchFrameRight = false;// 是否触摸右边界 private boolean touchFrameBottom = false;// 是否触摸下边界 public ViewfinderView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColor(getResources().getColor(R.color.viewfinder_mask)); tipPaint = new Paint(Paint.ANTI_ALIAS_FLAG); tipPaint.setAntiAlias(true); tipPaint.setStyle(Style.FILL); tipPaint.setColor(Color.WHITE); frame = new Rect(); bitmapRect = new Rect(); width = SystemUtil.getScreenSize(context)[0]; height = SystemUtil.getScreenSize(context)[1]; } @Override public void onDraw(Canvas canvas) { if (bitmap != null) { // 画阴影 canvas.drawRect(0, 0,frame.left, height,paint); canvas.drawRect(frame.left, 0, frame.right, frame.top, paint); canvas.drawRect(frame.right, 0, width, height, paint); canvas.drawRect(frame.left, frame.bottom, frame.right, height, paint); // 画圆点标注 canvas.drawCircle(frame.left, (frame.top + frame.bottom) / 2, 10, tipPaint); canvas.drawCircle(frame.right, (frame.top + frame.bottom) / 2, 10, tipPaint); canvas.drawCircle((frame.left + frame.right) / 2, frame.top, 10, tipPaint); canvas.drawCircle((frame.left + frame.right) / 2, frame.bottom, 10, tipPaint); // 画边框标注// canvas.drawCircle(frame.left, (frame.top + frame.bottom) / 2, 10,// tipPaint);// // canvas.drawCircle(frame.right, (frame.top + frame.bottom) / 2, 10,// tipPaint);// // canvas.drawCircle((frame.left + frame.right) / 2, frame.top, 10,// tipPaint);// // canvas.drawCircle((frame.left + frame.right) / 2, frame.bottom, 10,// tipPaint); } } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: downX = (int) event.getX(); downY = (int) event.getY(); if (checkContainsPoint(downX, downY)) { touchInFrame = true; if ((downX > frame.left - 10 && downX < frame.left + 10) && downY > frame.top && downY < frame.bottom) { touchFrameLeft = true; } if ((downX > frame.right - 10 && downX < frame.right + 10) && downY > frame.top && downY < frame.bottom) { touchFrameRight = true; } if ((downX > frame.left && downX < frame.right) && downY > frame.top - 10 && downY < frame.top + 10) { touchFrameTop = true; } if ((downX > frame.left && downX < frame.right) && downY > frame.bottom - 10 && downY < frame.bottom + 10) { touchFrameBottom = true; } } else { touchInFrame = false; } break; case MotionEvent.ACTION_MOVE: if (!touchInFrame) { return true; } int currentX = (int) event.getX(); int currentY = (int) event.getY(); // 是否在边界上判断 if (touchFrameLeft) { frame.left += currentX - downX; if (frame.left <= bitmapRect.left) { frame.left = bitmapRect.left; } frameWidth = frame.right - frame.left; downX = currentX; invalidate(); return true; } if (touchFrameRight) { frame.right += currentX - downX; if (frame.right >= bitmapRect.right) { frame.right = bitmapRect.right; } frameWidth = frame.right - frame.left; downX = currentX; invalidate(); return true; } if (touchFrameTop) { frame.top += currentY - downY; if (frame.top <= bitmapRect.top) { frame.top = bitmapRect.top; } frameHeight = frame.bottom - frame.top; downY = currentY; invalidate(); return true; } if (touchFrameBottom) { frame.bottom += currentY - downY; if (frame.bottom >= bitmapRect.bottom) { frame.bottom = bitmapRect.bottom; } frameHeight = frame.bottom - frame.top; downY = currentY; invalidate(); return true; } // 触摸发生不属于边界 frame.left += currentX - downX; frame.right += currentX - downX; frame.top += currentY - downY; frame.bottom += currentY - downY; if (frame.left <= bitmapRect.left) { frame.left = bitmapRect.left; frame.right = bitmapRect.left + frameWidth; } if (frame.right >= bitmapRect.right) { frame.left = bitmapRect.right - frameWidth; frame.right = bitmapRect.right; } if (frame.top <= bitmapRect.top) { frame.top = bitmapRect.top; frame.bottom = bitmapRect.top + frameHeight; } if (frame.bottom >= bitmapRect.bottom) { frame.top = bitmapRect.bottom - frameHeight; frame.bottom = bitmapRect.bottom; } downX = currentX; downY = currentY; invalidate(); break; case MotionEvent.ACTION_UP: touchFrameLeft = false; touchFrameTop = false; touchFrameRight = false; touchFrameBottom = false; break; default: break; } return true; } public void setBitmap(Bitmap bitmap) { this.bitmap = bitmap; bitmapWidth = frameWidth = bitmap.getWidth(); bitmapHeight = frameHeight = bitmap.getHeight(); bitmapRect.left = (width - bitmapWidth) / 2; bitmapRect.right = width - (width - bitmapWidth) / 2; bitmapRect.top = (height - bitmapHeight) / 2; bitmapRect.bottom = height - (height - bitmapHeight) / 2; frame.left = bitmapRect.left; frame.right = bitmapRect.right; frame.top = bitmapRect.top; frame.bottom = bitmapRect.bottom; invalidate(); } private boolean checkContainsPoint(int x, int y) { Rect boundsRect = new Rect(); boundsRect.left = frame.left - 10; boundsRect.top = frame.top - 10; boundsRect.right = frame.right + 10; boundsRect.bottom = frame.bottom + 10; if (boundsRect.contains(x, y)) { return true; } return false; } /** * 获取需要裁剪的边界比例 * * @return */ public List getClipScale() { List scales = new ArrayList(); scales.add((frame.left - bitmapRect.left) * 1.0f / bitmapWidth); scales.add((bitmapRect.right - frame.right) * 1.0f / bitmapWidth); scales.add((frame.top - bitmapRect.top) * 1.0f / bitmapHeight); scales.add((bitmapRect.bottom - frame.bottom) * 1.0f / bitmapHeight); return scales; }} http://download.csdn.net/detail/luo446718254/9605345
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