Android 将布局添加到ImageView活动

Android 将布局添加到ImageView活动,android,android-activity,imageview,Android,Android Activity,Imageview,我使用这段代码为ImageView实现了从收缩到缩放的手势。代码如下: import android.content.Context; import android.graphics.Matrix; import android.graphics.PointF; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.Log; import android.v

我使用这段代码为
ImageView
实现了从收缩到缩放的手势。代码如下:

import android.content.Context;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.widget.ImageView;

public class TouchImageView extends ImageView {

Matrix matrix;

// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;

// Remember some things for zooming
PointF last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;

int viewWidth, viewHeight;
static final int CLICK = 3;
float saveScale = 1f;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;

ScaleGestureDetector mScaleDetector;

Context context;

public TouchImageView(Context context) {
    super(context);
    sharedConstructing(context);
}

public TouchImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    sharedConstructing(context);
}



private void sharedConstructing(Context context) {
    super.setClickable(true);
    this.context = context;
    mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
    matrix = new Matrix();
    m = new float[9];
    setImageMatrix(matrix);
    setScaleType(ScaleType.MATRIX);

    setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            mScaleDetector.onTouchEvent(event);
            PointF curr = new PointF(event.getX(), event.getY());

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    last.set(curr);
                    start.set(last);
                    mode = DRAG;
                    break;

                case MotionEvent.ACTION_MOVE:
                    if (mode == DRAG) {
                        float deltaX = curr.x - last.x;
                        float deltaY = curr.y - last.y;
                        float fixTransX = getFixDragTrans(deltaX, viewWidth, origWidth * saveScale);
                        float fixTransY = getFixDragTrans(deltaY, viewHeight, origHeight * saveScale);
                        matrix.postTranslate(fixTransX, fixTransY);
                        fixTrans();
                        last.set(curr.x, curr.y);
                    }
                    break;

                case MotionEvent.ACTION_UP:
                    mode = NONE;
                    int xDiff = (int) Math.abs(curr.x - start.x);
                    int yDiff = (int) Math.abs(curr.y - start.y);
                    if (xDiff < CLICK && yDiff < CLICK)
                        performClick();
                    break;

                case MotionEvent.ACTION_POINTER_UP:
                    mode = NONE;
                    break;
            }

            setImageMatrix(matrix);
            invalidate();
            return true; // indicate event was handled
        }

    });
}

public void setMaxZoom(float x) {
    maxScale = x;
}

private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
    @Override
    public boolean onScaleBegin(ScaleGestureDetector detector) {
        mode = ZOOM;
        return true;
    }

    @Override
    public boolean onScale(ScaleGestureDetector detector) {
        float mScaleFactor = detector.getScaleFactor();
        float origScale = saveScale;
        saveScale *= mScaleFactor;
        if (saveScale > maxScale) {
            saveScale = maxScale;
            mScaleFactor = maxScale / origScale;
        } else if (saveScale < minScale) {
            saveScale = minScale;
            mScaleFactor = minScale / origScale;
        }

        if (origWidth * saveScale <= viewWidth || origHeight * saveScale <= viewHeight)
            matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2, viewHeight / 2);
        else
            matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());

        fixTrans();
        return true;
    }
}

void fixTrans() {
    matrix.getValues(m);
    float transX = m[Matrix.MTRANS_X];
    float transY = m[Matrix.MTRANS_Y];

    float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
    float fixTransY = getFixTrans(transY, viewHeight, origHeight * saveScale);

    if (fixTransX != 0 || fixTransY != 0)
        matrix.postTranslate(fixTransX, fixTransY);
}

float getFixTrans(float trans, float viewSize, float contentSize) {
    float minTrans, maxTrans;

    if (contentSize <= viewSize) {
        minTrans = 0;
        maxTrans = viewSize - contentSize;
    } else {
        minTrans = viewSize - contentSize;
        maxTrans = 0;
    }

    if (trans < minTrans)
        return -trans + minTrans;
    if (trans > maxTrans)
        return -trans + maxTrans;
    return 0;
}

float getFixDragTrans(float delta, float viewSize, float contentSize) {
    if (contentSize <= viewSize) {
        return 0;
    }
    return delta;
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    viewWidth = MeasureSpec.getSize(widthMeasureSpec);
    viewHeight = MeasureSpec.getSize(heightMeasureSpec);

    //
    // Rescales image on rotation
    //
    if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
            || viewWidth == 0 || viewHeight == 0)
        return;
    oldMeasuredHeight = viewHeight;
    oldMeasuredWidth = viewWidth;

    if (saveScale == 1) {
        //Fit to screen.
        float scale;

        Drawable drawable = getDrawable();
        if (drawable == null || drawable.getIntrinsicWidth() == 0 || drawable.getIntrinsicHeight() == 0)
            return;
        int bmWidth = drawable.getIntrinsicWidth();
        int bmHeight = drawable.getIntrinsicHeight();

        Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);

        float scaleX = (float) viewWidth / (float) bmWidth;
        float scaleY = (float) viewHeight / (float) bmHeight;
        scale = Math.min(scaleX, scaleY);
        matrix.setScale(scale, scale);

        // Center the image
        float redundantYSpace = (float) viewHeight - (scale * (float) bmHeight);
        float redundantXSpace = (float) viewWidth - (scale * (float) bmWidth);
        redundantYSpace /= (float) 2;
        redundantXSpace /= (float) 2;

        matrix.postTranslate(redundantXSpace, redundantYSpace);

        origWidth = viewWidth - 2 * redundantXSpace;
        origHeight = viewHeight - 2 * redundantYSpace;
        setImageMatrix(matrix);
    }
    fixTrans();
  }
}
导入android.content.Context;
导入android.graphics.Matrix;
导入android.graphics.PointF;
导入android.graphics.drawable.drawable;
导入android.util.AttributeSet;
导入android.util.Log;
导入android.view.MotionEvent;
导入android.view.scalegestruedetector;
导入android.view.view;
导入android.widget.ImageView;
公共类TouchImageView扩展了ImageView{
矩阵;
//我们可能处于这三种状态之一
静态最终int NONE=0;
静态最终整数阻力=1;
静态最终整数缩放=2;
int模式=无;
//记住一些关于缩放的事情
PointF last=新的PointF();
PointF start=新的PointF();
浮动最小刻度=1f;
浮点最大刻度=3f;
浮动[]m;
int viewWidth,viewHeight;
静态最终int CLICK=3;
浮动存储比例=1f;
受保护的浮子起始宽度、起始高度;
int oldMeasuredWidth,oldMeasuredHeight;
scalegestruedetector mScaleDetector;
语境;
公共TouchImageView(上下文){
超级(上下文);
共享构造(上下文);
}
公共TouchImageView(上下文、属性集属性){
超级(上下文,attrs);
共享构造(上下文);
}
私有void共享构造(上下文){
super.setClickable(true);
this.context=上下文;
mScaleDetector=新的scalegestruedetector(上下文,新的ScaleListener());
矩阵=新矩阵();
m=新浮点数[9];
setImageMatrix(矩阵);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(新的OnTouchListener(){
@凌驾
公共布尔onTouch(视图v,运动事件){
mScaleDetector.onTouchEvent(事件);
PointF curr=新的PointF(event.getX(),event.getY());
开关(event.getAction()){
case MotionEvent.ACTION\u DOWN:
最后一组(当前);
开始。设置(最后);
模式=拖动;
打破
case MotionEvent.ACTION\u移动:
如果(模式==拖动){
浮动deltaX=当前x-最后x;
浮动三角洲=当前y-最后y;
float fixtranx=getfixtragtrans(deltaX、viewWidth、origWidth*saveScale);
float fixTransY=GetFixtragtrans(三角洲、视图高度、origHeight*保存比例);
矩阵后翻译(fixtranx,fixtrany);
fixTrans();
最后一组(当前x、当前y);
}
打破
case MotionEvent.ACTION\u UP:
模式=无;
intxdiff=(int)Math.abs(curr.x-start.x);
int yDiff=(int)Math.abs(curr.y-start.y);
if(xDiff最大比例){
saveScale=maxScale;
mScaleFactor=最大刻度/原始刻度;
}else if(保存比例<最小比例){
saveScale=minScale;
mScaleFactor=最小刻度/原始刻度;
}

如果(origWidth*saveScale将自定义视图添加到相对布局

RelativeLayout rl = (RelativeLayout)findViewById(R.id.relativeLayout)l
TouchImageView tv = new TouchImageView(this);
rl.addView(tv);

这不是一个活动。您拥有的是一个自定义视图类。那么您想要什么呢???@Raghunandan我想在另一个布局中使用它。那么我该如何做呢?
setContentView(新的TouchImageView(this))
在另一个activity@Raghunandan你误解了我的意思。我想在相对布局中用这个代替imageview。我如何才能做到这一点?@将这个自定义视图添加到相对布局中。请详细解释你需要什么。我想在另一个活动中用这个代替imageview。我想用TouchImageView代替imageview,因为它可以缩放e图像。那么你能发布这方面的代码吗?@ChinmayDabke将realative layout放在你想要的xml中。在onCreate中初始化相对布局。将自定义视图添加到相对布局。现在试试这个,然后回来评论。非常感谢。我会试试,很快就会回来!