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ImageViewに四角い枠を追加して、クロップ目的のプレビューを提供するために8方向からサイズを変更できるようにします。クロッピングのためにImageView Androidにボーダーを追加する
ImageViewを定義し、四角形を描画するコードを追加するか、SurfaceViewにImageViewを追加すると、目的を達成するためにどのように実装できますか？ここで
は、私は私の画像の周囲に四角形を描画するために使用することができます私のコードです：
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.DragEvent;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
public class CustomCropImageView extends ImageView implements View.OnTouchListener{
// Bitmap to draw.
Bitmap myBitmap;
// Fundamental attributes.
int xPos, yPos;
int originWidth, originHeight;
int widthImg, heightImg;
int xCrop, yCrop;
int cropWidth, cropHeight;
GestureDetector myGesture;
public CustomCropImageView(Context context){
super(context);
xPos = yPos = xCrop = yCrop = 0;
// setOnTouchListener(this);
}
public CustomCropImageView(Context context, AttributeSet attSet){
super(context, attSet);
xPos = yPos = xCrop = yCrop = 0;
// setOnTouchListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if(drawable == null)
return;
if(originWidth == 0 && originHeight == 0){
Bitmap tmp = ((BitmapDrawable)drawable).getBitmap();
myBitmap = tmp.copy(Bitmap.Config.ARGB_8888, true);
originWidth = myBitmap.getWidth();
originHeight = myBitmap.getHeight();
Integer[] myDWAndH = getScreenWidthAndHeight();
widthImg = cropWidth = myDWAndH[0];
heightImg = cropHeight = (int)((float)myDWAndH[0]*((float)originHeight/(float)originWidth));
yPos = yCrop = (myDWAndH[1] - heightImg)/2;
myBitmap = Bitmap.createScaledBitmap(myBitmap, widthImg, heightImg, false);
}
Paint myPaint = new Paint();
canvas.drawBitmap(myBitmap, xPos, yPos, myPaint);
drawAnchorRectangle(canvas);
}
void drawAnchorRectangle(Canvas canvas){
// Anchor rectangle.
Paint myPaint = new Paint();
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setColor(getContext().getResources().getColor(R.color.ImgVBorder));
myPaint.setStrokeWidth(5);
Rect myRect = new Rect(xCrop, yCrop, cropWidth, yCrop + cropHeight);
canvas.drawRect(myRect, myPaint);
// Anchor point.
myPaint.setStyle(Paint.Style.FILL);
myPaint.setColor(getContext().getResources().getColor(R.color.ImgVAnchorPoint));
myPaint.setStrokeWidth(3);
int anchorPointW = 10;
int halfAnchorPointW = anchorPointW/2;
/*
// Top left.
Rect anchorPoint = new Rect(xCrop + cropWidth - halfAnchorPointW, yCrop - halfAnchorPointW,
anchorPointW, yCrop + halfAnchorPointW);
canvas.drawRect(anchorPoint, myPaint);
// Top right.
anchorPoint.set(xCrop + cropWidth - halfAnchorPointW, yCrop - halfAnchorPointW,
anchorPointW, yCrop + halfAnchorPointW);
canvas.drawRect(anchorPoint, myPaint);
*/
}
Integer[] getScreenWidthAndHeight(){
DisplayMetrics dMetrics = new DisplayMetrics();
((MainActivity)getContext()).getWindowManager().getDefaultDisplay().getMetrics(dMetrics);
Integer[] myResult = new Integer[2];
myResult[0] = dMetrics.widthPixels - 40;
myResult[1] = dMetrics.heightPixels;
return myResult;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getActionMasked();
final String TAG = "!!!123";
switch (action) {
case MotionEvent.ACTION_DOWN:
Log.d(TAG, "Action was DOWN");
return true;
case MotionEvent.ACTION_MOVE:
Log.d(TAG, "Action was MOVE");
break;
case MotionEvent.ACTION_UP:
Log.d(TAG, "Action was UP");
break;
case MotionEvent.ACTION_CANCEL:
Log.d(TAG, "Action was CANCEL");
break;
case MotionEvent.ACTION_OUTSIDE:
Log.d(TAG, "Movement occurred outside bounds of current screen element");
break;
}
return super.onTouchEvent(event);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return super.onTouchEvent(event);
}
}