我想缩放、移动、调整图像大小。我想用指示器包围图像，指导用户这些指示器执行什么操作，即移动、旋转、缩放。
我试过了
- 缩放 - 但它只会减少。没有机会增加图像的长度和高度。
- 旋转 - 实现但通过插入手动度数。这不是一个好的选择。
- 移动 - 因为我正在实现 Api < 11 的阻力。所以有点困难。在这里仍然没有希望。
是否有任何库可以让我进行简单的图像编辑[移动、缩放、旋转]？
问问题
18190 次
8 回答
6
您可以使用矩阵变换来实现旋转、缩放和移动....希望对您有所帮助....
用于旋转
Matrix matrix = new Matrix();
matrix.postRotate(90);
用于缩放
matrix.postScale(scaleWidth, scaleHeight);
在不更改原始位图的情况下创建新位图...像这样
Bitmap bmp2 = Bitmap.createBitmap(bmp1, 0, 0, pow2, pow2, matrix, true);
于 2013-02-10T16:57:26.670 回答
4
只需查看此图像裁剪参考：
http://www.londatiga.net/featured-articles/how-to-select-and-crop-image-on-android/
图像旋转，参考这个例子即可；此示例代码动态表示图像的旋转：
http://android-er.blogspot.in/2010/07/rotate-bitmap-image-using-matrix.html
此链接对于图像裁剪、旋转和缩放也很有用：
于 2013-02-19T09:18:13.533 回答
4
使用库：StickerView
它是一个第 3 方图书馆，它提供了我正在寻找的东西。
解决方法：
这些答案仍然是我在 OP 中要求的一半。表示它没有被某些特定指标包围。我仍在寻找如何ImageView用指标包装并将它们用于翻译和调整大小。
Activity初始化对翻译和调整大小很重要的变量ImageView
public static final int DRAG = 1;
public static final int NONE = 0;
private static final String TAG = "Touch";
public static final int ZOOM = 2;
public static PointF mid = new PointF();
public static int mode = 0;
float d = 0.0F;
Matrix savedMatrix = new Matrix();
Matrix matrix = new Matrix();
PointF start = new PointF();
设置ImageView为 scaleType -Matrix
iv = new ImageView(this);
iv.setPadding(10, 10, 25, 25);
iv.setScaleType(ImageView.ScaleType.MATRIX);
iv.setOnTouchListener(t);
添加使用的 onTouch 监听ImageView器
- 1 指翻译 - 拖动
2 指缩放 - 调整大小 {Pinch To Zoom}
View.OnTouchListener t = new View.OnTouchListener() { public boolean onTouch(View paramView, MotionEvent event) { ImageView view = (ImageView)paramView; switch (event.getAction() & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: savedMatrix.set(matrix); start.set(event.getX(), event.getY()); Log.d(TAG, "mode=DRAG" ); mode = DRAG; break; case MotionEvent.ACTION_POINTER_DOWN: oldDist = spacing(event); Log.d(TAG, "oldDist=" + oldDist); if (oldDist > 10f) { savedMatrix.set(matrix); midPoint(mid, event); mode = ZOOM; Log.d(TAG, "mode=ZOOM" ); } break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { matrix.set(savedMatrix); matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); } else if (mode == ZOOM) { float newDist = spacing(event); Log.d(TAG, "newDist=" + newDist); if (newDist > 10f) { matrix.set(savedMatrix); float scale = newDist / oldDist; matrix.postScale(scale, scale, mid.x, mid.y); } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_POINTER_UP: mode = NONE; Log.d(TAG, "mode=NONE" ); break; } view.setImageMatrix(matrix); return true; } private void midPoint(PointF point, MotionEvent event) { float x = event.getX(0) + event.getX(1); float y = event.getY(0) + event.getY(1); point.set(x / 2, y / 2); } private float spacing(MotionEvent event) { float x = event.getX(0) - event.getX(1); float y = event.getY(0) - event.getY(1); return FloatMath.sqrt(x * x + y * y); } };
于 2013-02-19T14:41:29.137 回答
3
我最近尝试了同样的事情，但最终使用了一个库，因为它涵盖了更多的边缘情况。这是一个很棒且使用非常广泛的库：
于 2013-02-19T01:00:05.690 回答
2
我想我可以在轮换部分为您提供帮助。我最近制作了一个 android 轮菜单库。它跟踪用户的手部动作并相应地旋转图像视图。你可以查看源代码，看看我是怎么做到的：
于 2013-02-18T08:14:10.127 回答
2
我知道这不是一个答案，但值得一提。
看看这个项目。我打算把它放在 GitHub 上，但它还没有完成（根本）。
有一个按钮可以旋转图像。我仍在努力“保存”。由于Lorenzo Villani 的项目，许多类都取自 Android 源代码
添加到项目的清单中：
<activity
android:name="mobi.sherif.camera.CropImage"
android:hardwareAccelerated="false"
android:screenOrientation="portrait" >
使用以下方式调用活动：
Intent intent = new Intent(mContext, CropImage.class);
intent.setData(uri);
startActivityForResult(intent, S.request.cropimage);
于 2013-02-20T07:57:50.167 回答
1
位图旋转
Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, targetHeight, config);
Canvas canvas = new Canvas(targetBitmap);
Matrix matrix = new Matrix();
matrix.setRotate(mRotation,source.getWidth()/2,source.getHeight()/2);
canvas.drawBitmap(source, matrix, new Paint());
图像缩放 缩放
AssetManager assetManager = context.getAssets();
InputStream imageIn;
String imgPath = "test.png";
Bitmap image;
try {
imageIn = assetManager.open(imgPath, AssetManager.ACCESS_BUFFER);
image = BitmapFactory.decodeStream(imageIn);
} catch (IOException e) {
}
//TODO: calculate width and height to fill or fit screen
image = Bitmap.createScaledBitmap(image, width, height, true);
带有触摸事件的画布中的图像移动图像
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
public class ImgView extends View {
private static final int INVALID_POINTER_ID = -1;
private Drawable mImage;
private float mPosX;
private float mPosY;
private float mLastTouchX;
private float mLastTouchY;
private int mActivePointerId = INVALID_POINTER_ID;
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
public ImgView(Context context) {
this(context, null, 0);
mImage = getResources().getDrawable(R.drawable.imagename);
mImage.setBounds(0, 0, mImage.getIntrinsicWidth(), mImage.getIntrinsicHeight());
}
public ImgView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ImgView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// Let the ScaleGestureDetector inspect all events.
mScaleDetector.onTouchEvent(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
mLastTouchX = x;
mLastTouchY = y;
mActivePointerId = ev.getPointerId(0);
break;
}
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
// Only move if the ScaleGestureDetector isn't processing a gesture.
if (!mScaleDetector.isInProgress()) {
final float dx = x - mLastTouchX;
final float dy = y - mLastTouchY;
mPosX += dx;
mPosY += dy;
invalidate();
}
mLastTouchX = x;
mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastTouchX = ev.getX(newPointerIndex);
mLastTouchY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
}
break;
}
}
return true;
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
Log.d("DEBUG", "X: "+mPosX+" Y: "+mPosY);
canvas.translate(mPosX, mPosY);
canvas.scale(mScaleFactor, mScaleFactor);
mImage.draw(canvas);
canvas.restore();
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 10.0f));
invalidate();
return true;
}
}
}
于 2013-02-19T08:30:20.073 回答
1
于 2015-07-08T11:00:55.637 回答