Question

我想缩放，移动，调整图像大小。我想用指示器环绕图像，指示用户这些指示器执行的操作，即移动，旋转，缩放。

enter image description here

我试过

缩放 - 但它只会减少。没有机会增加图像的长度和高度。
旋转 - 通过插入手动度数实现。这不是一个好选择。
搬家 - 因为我实现了对Api＆lt;那么一点点困难。在这里仍然没有希望。

有没有可以对我进行简单图像编辑的库[移动，缩放，旋转]？

Answer 1

只需查看此图片裁剪参考：

http://www.londatiga.net/featured-articles/how-to-select-and-crop-image-on-android/

对于图像旋转，请参考此示例;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

此链接对图像裁剪，旋转和缩放也很有用：

https://github.com/Yalantis/uCrop

Answer 2

使用资料库：StickerView

它是第三方图书馆，它提供了我正在寻找的东西。

WorkAround：

这些答案仍然是我在OP中所要求的一半。意味着它没有被某些特定指标所支配。我还在搜索如何用ImageView包装指标并将它们用于翻译＆amp;调整大小。

在Activity内启动变量，对于Translate＆amp;调整ImageView

的大小

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();

将ImageView设置为scaleType - Matrix

iv = new ImageView(this);
iv.setPadding(10, 10, 25, 25);
iv.setScaleType(ImageView.ScaleType.MATRIX);

iv.setOnTouchListener(t);

将onTouch侦听器添加到使用

的ImageView

1手指翻译 - 拖动

2手指缩放 - 调整{缩放到缩放}

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);
      }
     };

Answer 3

我最近尝试了同样的事情，但最终使用了一个库，因为它涵盖了更多边缘案例。这是一个很棒的，使用相当广泛的库：

http://code.google.com/p/android-multitouch-controller/

Answer 4

我想我可以帮助你完成旋转部分。我最近制作了一个安卓车轮菜单库。它跟踪用户的手部动作并相应地旋转图像视图。您可以查看来源，看看我是如何做到的：

https://github.com/anupcowkur/Android-Wheel-Menu

Answer 5

我知道这不是答案，但值得一提。

看看this project。我打算把它放在GitHub上，但它还没有完成（根本没有）。

有一个旋转图像的按钮。我还在努力“保存”。由于Lorenzo Villani's project

，许多课程都来自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);

enter image description here

Answer 6

您可以在项目中https://github.com/siddhpuraamitr/MultitouchWithDynamicAddandRemove尝试此代码

Answer 7

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());

图片缩放 Scaling

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);

图片移动 Image in Canvas with touch events

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;
        }
    }

}

在图像中围绕图像放置一些指示器移动/调整大小/旋转操作

7 个答案: