android从服务器下载多个图片，存储在sd卡中，并使用毕加索库检索

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如何从服务器下载多个图像并存储在sd卡中，如何使用毕加索库检索…以及如何缩放图像

您可以使用毕加索动态设置图像URL以查看图像，而无需下载图像

Picasso.with(mContext).load(mDataList.get(position).getImageUrl()).placeholder(R.drawable.image_bg).
                        error(R.drawable.image_bg).into(mIvImageView);

如果要缩放图像，可以将“缩放”属性设置为“图像视图”。为此，您需要创建一个自定义图像视图。请检查下面的代码

public class TouchImageView extends ImageView {
    // We can be in one of these 3 states
    static final int NONE = 0;
    static final int DRAG = 1;
    static final int ZOOM = 2;
    static final int CLICK = 3;
    protected float origWidth, origHeight;
    int mode = NONE;
    Matrix matrix;
    // Remember some things for zooming
    PointF last = new PointF();
    PointF start = new PointF();
    float minScale = 1f;
    float maxScale = 3f;
    float[] m;
    int viewWidth, viewHeight;
    float saveScale = 1f;
    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;
    }

    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();
    }

    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;
        }
    }

}

公共类TouchImageView扩展了ImageView{
//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；
静态最终int CLICK=3；
受保护的浮子起始宽度、起始高度；
int模式=无；
矩阵；
//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；
浮动存储比例=1f；
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、，
原始宽度*保存比例）；
float fixTransY=GetFixtragtrans（deltaY、viewHeight、，
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如果（origWidth*saveScale）我想要使用毕加索的所有代码，我可以用存储在sd卡中并重试来完成吗？你得到响应了吗？你正在解析响应吗？如果是。粘贴它。
    InputStream input = null;
    OutputStream outStream = null;
    String localFileName = "";
    String localTempFileName = "";
    File targetFile=null;
    try {
       File dir =  getApplicationContext().getFilesDir();
        if(dir.getFreeSpace()< DownloadsCleanupService.MINIMUM_SPACE)
            DownloadsCleanupService.startImmediateCleanupAction(getApplicationContext());
        try {
            Thread.sleep(4000);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        String extension = mImagePath.substring(mImagePath.lastIndexOf(".") + 1);

        try {
            localTempFileName ="temp"+
                    mtileId + "." + extension;

            localFileName =
                    mtileId + "." + extension;

        } catch (Exception e) {
            e.printStackTrace();
        }
        // Checking if file already exists in device or not
          targetFile = new File(getApplicationContext().getFilesDir(),localFileName);
        if (targetFile.exists()) {
            targetFile.setLastModified(System.currentTimeMillis());
            return targetFile.getCanonicalPath();
        } else {
            URL url = new URL(mImagePath);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        File targetTempFile = new File(getApplicationContext().getFilesDir(),localTempFileName);
            int downloaded = 0;
            if (targetTempFile.exists()) {
                downloaded = (int) targetTempFile.length();
                connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
            } else {
                connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
            }
            connection.setDoInput(true);
            connection.setConnectTimeout(30000);
            connection.setReadTimeout(30000);
            connection.connect();
            input = connection.getInputStream();
            outStream =  openFileOutput(localTempFileName, Context.MODE_APPEND);
            byte[] buffer = new byte[8 * 1024];
            int bytesRead;
            while ((bytesRead = input.read(buffer)) != -1) {
                outStream.write(buffer, 0, bytesRead);
            }

            targetTempFile.renameTo(targetFile);
            targetFile.setLastModified(System.currentTimeMillis());
        }
        return targetFile.getCanonicalPath();
    } catch (IOException e) {
        Log.e(TAG, "" + e);
        e.printStackTrace();
    } catch (Exception e) {
        Log.e(TAG, "" + e);
        e.printStackTrace();
    } finally {
        try {
            outStream.close();
        } catch (Exception e) {
        }
        try {
            input.close();
        } catch (Exception e) {
        }


    }
    return "";
}