请帮助解决这个问题...
First Fragment 这是1stFragment文件发送编码位图的字符串
tmp = getArguments().getString("PHOTO");
byte [] encodeByte=Base64.decode(tmp,Base64.DEFAULT);
bmp=BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
ByteArrayOutputStream b=new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG,100, b);
bm =b.toByteArray();
temp=Base64.encodeToString(bm, Base64.DEFAULT);Fragment fr = new CropToolActivity();
fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
args = new Bundle();
args.putString("PHOTO", temp);
fr.setArguments(args);
ft.replace(R.id.frame,fr);
ft.commit();
CropToolActivity 这是一个2ndFragment文件，接收编码位图的字符串 还将CropView设置为布局
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.croptool, container, false);
myCropView = (CropView)view.findViewById(R.id.crop_tool);
myCropView = new CropView(getActivity().getApplicationContext());
tmp = getArguments().getString("PHOTO");
byte [] encodeByte=Base64.decode(tmp,Base64.DEFAULT);
bmp=BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
myCropView.setImageBitmap(bmp);
croptool.xml 这是第二个片段布局的XML文件
<com.tcss.photostyle.CropView
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:id="@+id/crop_tool" />
</LinearLayout>
CropView.Java
这是一个croptool java文件，用于演示位图上的Croptool
public class CropView extends ImageView {
Paint paint = new Paint();
private int initial_size = 300;
private static Point leftTop, rightBottom, center, previous;
private static final int DRAG= 0;
private static final int LEFT= 1;
private static final int TOP= 2;
private static final int RIGHT= 3;
private static final int BOTTOM= 4;
private int imageScaledWidth,imageScaledHeight;
// Adding parent class constructors
public CropView(Context context) {
super(context);
initCropView();
}
public CropView(Context context, AttributeSet attrs) {
super(context, attrs, 0);
initCropView();
}
public CropView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initCropView();
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
if(leftTop.equals(0, 0))
resetPoints();
canvas.drawRect(leftTop.x, leftTop.y, rightBottom.x, rightBottom.y, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int eventaction = event.getAction();
switch (eventaction) {
case MotionEvent.ACTION_DOWN:
previous.set((int)event.getX(), (int)event.getY());
break;
case MotionEvent.ACTION_MOVE:
if(isActionInsideRectangle(event.getX(), event.getY())) {
adjustRectangle((int)event.getX(), (int)event.getY());
invalidate(); // redraw rectangle
previous.set((int)event.getX(), (int)event.getY());
}
break;
case MotionEvent.ACTION_UP:
previous = new Point();
break;
}
return true;
}
private void initCropView() {
paint.setColor(Color.YELLOW);
paint.setStyle(Style.STROKE);
paint.setStrokeWidth(5);
leftTop = new Point();
rightBottom = new Point();
center = new Point();
previous = new Point();
}
public void resetPoints() {
center.set(getWidth()/2, getHeight()/2);
leftTop.set((getWidth()-initial_size)/2,(getHeight()-initial_size)/2);
rightBottom.set(leftTop.x+initial_size, leftTop.y+initial_size);
}
private static boolean isActionInsideRectangle(float x, float y) {
int buffer = 10;
return (x>=(leftTop.x-buffer)&&x<=(rightBottom.x+buffer)&& y>=(leftTop.y-buffer)&&y<=(rightBottom.y+buffer))?true:false;
}
private boolean isInImageRange(PointF point) {
// Get image matrix values and place them in an array
float[] f = new float[9];
getImageMatrix().getValues(f);
// Calculate the scaled dimensions
imageScaledWidth = Math.round(getDrawable().getIntrinsicWidth() * f[Matrix.MSCALE_X]);
imageScaledHeight = Math.round(getDrawable().getIntrinsicHeight() * f[Matrix.MSCALE_Y]);
return (point.x>=(center.x-(imageScaledWidth/2))&&point.x<=(center.x+(imageScaledWidth/2))&&point.y>=(center.y-(imageScaledHeight/2))&&point.y<=(center.y+(imageScaledHeight/2)))?true:false;
}
private void adjustRectangle(int x, int y) {
int movement;
switch(getAffectedSide(x,y)) {
case LEFT:
movement = x-leftTop.x;
if(isInImageRange(new PointF(leftTop.x+movement,leftTop.y+movement)))
leftTop.set(leftTop.x+movement,leftTop.y+movement);
break;
case TOP:
movement = y-leftTop.y;
if(isInImageRange(new PointF(leftTop.x+movement,leftTop.y+movement)))
leftTop.set(leftTop.x+movement,leftTop.y+movement);
break;
case RIGHT:
movement = x-rightBottom.x;
if(isInImageRange(new PointF(rightBottom.x+movement,rightBottom.y+movement)))
rightBottom.set(rightBottom.x+movement,rightBottom.y+movement);
break;
case BOTTOM:
movement = y-rightBottom.y;
if(isInImageRange(new PointF(rightBottom.x+movement,rightBottom.y+movement)))
rightBottom.set(rightBottom.x+movement,rightBottom.y+movement);
break;
case DRAG:
movement = x-previous.x;
int movementY = y-previous.y;
if(isInImageRange(new PointF(leftTop.x+movement,leftTop.y+movementY)) && isInImageRange(new PointF(rightBottom.x+movement,rightBottom.y+movementY))) {
leftTop.set(leftTop.x+movement,leftTop.y+movementY);
rightBottom.set(rightBottom.x+movement,rightBottom.y+movementY);
}
break;
}
}
private static int getAffectedSide(float x, float y) {
int buffer = 10;
if(x>=(leftTop.x-buffer)&&x<=(leftTop.x+buffer))
return LEFT;
else if(y>=(leftTop.y-buffer)&&y<=(leftTop.y+buffer))
return TOP;
else if(x>=(rightBottom.x-buffer)&&x<=(rightBottom.x+buffer))
return RIGHT;
else if(y>=(rightBottom.y-buffer)&&y<=(rightBottom.y+buffer))
return BOTTOM;
else
return DRAG;
}
public byte[] getCroppedImage() {
BitmapDrawable drawable = (BitmapDrawable)getDrawable();
float x = leftTop.x-center.x+(drawable.getBitmap().getWidth()/2);
float y = leftTop.y-center.y+(drawable.getBitmap().getHeight()/2);
Bitmap cropped = Bitmap.createBitmap(drawable.getBitmap(),(int)x,(int)y,(int)rightBottom.x-(int)leftTop.x,(int)rightBottom.y-(int)leftTop.y);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
cropped.compress(Bitmap.CompressFormat.PNG, 100, stream);
return stream.toByteArray();
}
}
答案 0 :(得分：1)
这是一种从中心裁剪位图的方法，假设newWidth < bitmap.getWidth() and newHeight < bitmap.getHeight()
public Bitmap cropBitmap(Bitmap bitmap, int newWidth, int newHeight) {
double x = (bitmap.getWidth() - newWidth) / 2;
double y = (bitmap.getHeight() - newHeight) / 2;
Bitmap b = Bitmap.createBitmap((int)newWidth, (int)newHeight, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
c.drawBitmap(bitmap, new Rect((int)x , (int)y, (int)(x + newWidth), (int)(y + newHeight)), new Rect(0, 0, (int)newWidth, (int)newHeight), null);
return b;
}