欢迎来到 Android人的问与答 ,在这里提问或帮助他人解答。 Question2Answer的1.6.x和1.7.x版本的中文翻译包我修改更新:

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Q2A 1.6.x - Chinese Simplified (简体中文)

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Android中如何实现对图片的放大缩小

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github上下源代码:https://github.com/MikeOrtiz/TouchImageView

翻不了,就用下面的代码凑合用:

 

 
 
 
 
 
最新提问 12月 31, 2014 分类:Android View | 用户: forlong401 (7,050 分)

1个回答

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import se.robertfoss.ChanImageBrowser.Viewer;
public class TouchImageView extends ImageView {
    private static final String TAG = "Touch";
    // These matrices will be used to move and zoom image
    Matrix matrix = new Matrix();
    Matrix savedMatrix = new 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 start = new PointF();
    PointF mid = new PointF();
    float oldDist = 1f;

    Context context;

    public TouchImageView(Context context) {
        super(context);
        super.setClickable(true);
        this.context = context;

        matrix.setTranslate(1f, 1f);
        setImageMatrix(matrix);
        setScaleType(ScaleType.MATRIX);

        setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent rawEvent) {
                WrapMotionEvent event = WrapMotionEvent.wrap(rawEvent);

                // Dump touch event to log
                if (Viewer.isDebug == true){
                    dumpEvent(event);
                }

                // Handle touch events here...
                switch (event.getAction() & MotionEvent.ACTION_MASK) {
                case MotionEvent.ACTION_DOWN:
                    savedMatrix.set(matrix);
                    start.set(event.getX(), event.getY());
                    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;
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    int xDiff = (int) Math.abs(event.getX() - start.x);
                    int yDiff = (int) Math.abs(event.getY() - start.y);
                    if (xDiff < 8 && yDiff < 8){
                        performClick();
                    }
                case MotionEvent.ACTION_POINTER_UP:
                    mode = NONE;
                    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);
                        if (newDist > 10f) {
                            matrix.set(savedMatrix);
                            float scale = newDist / oldDist;
                            matrix.postScale(scale, scale, mid.x, mid.y);
                        }
                    }
                    break;
                }

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

        });
    }
最新回答 12月 31, 2014 用户: forlong401 (7,050 分)
    public void setImage(Bitmap bm, int displayWidth, int displayHeight) {
        super.setImageBitmap(bm);

        //Fit to screen.
        float scale;
        if ((displayHeight / bm.getHeight()) >= (displayWidth / bm.getWidth())){
            scale =  (float)displayWidth / (float)bm.getWidth();
        } else {
            scale = (float)displayHeight / (float)bm.getHeight();
        }

        savedMatrix.set(matrix);
        matrix.set(savedMatrix);
        matrix.postScale(scale, scale, mid.x, mid.y);
        setImageMatrix(matrix);

        // Center the image
        float redundantYSpace = (float)displayHeight - (scale * (float)bm.getHeight()) ;
        float redundantXSpace = (float)displayWidth - (scale * (float)bm.getWidth());
        redundantYSpace /= (float)2;
        redundantXSpace /= (float)2;
        savedMatrix.set(matrix);
        matrix.set(savedMatrix);
        matrix.postTranslate(redundantXSpace, redundantYSpace);
        setImageMatrix(matrix);
    }

    /** Show an event in the LogCat view, for debugging */
    private void dumpEvent(WrapMotionEvent event) {
        String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
            "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
        StringBuilder sb = new StringBuilder();
        int action = event.getAction();
        int actionCode = action & MotionEvent.ACTION_MASK;
        sb.append("event ACTION_").append(names[actionCode]);
        if (actionCode == MotionEvent.ACTION_POINTER_DOWN
                || actionCode == MotionEvent.ACTION_POINTER_UP) {
            sb.append("(pid ").append(
                    action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
            sb.append(")");
        }
        sb.append("[");
        for (int i = 0; i < event.getPointerCount(); i++) {
            sb.append("#").append(i);
            sb.append("(pid ").append(event.getPointerId(i));
            sb.append(")=").append((int) event.getX(i));
            sb.append(",").append((int) event.getY(i));
            if (i + 1 < event.getPointerCount())
            sb.append(";");
        }
        sb.append("]");
    }

    /** Determine the space between the first two fingers */
    private float spacing(WrapMotionEvent event) {
        float x = event.getX(0) - event.getX(1);
        float y = event.getY(0) - event.getY(1);
        return FloatMath.sqrt(x * x + y * y);
    }

    /** Calculate the mid point of the first two fingers */
    private void midPoint(PointF point, WrapMotionEvent event) {
        float x = event.getX(0) + event.getX(1);
        float y = event.getY(0) + event.getY(1);
        point.set(x / 2, y / 2);
    }
}
public class WrapMotionEvent {
protected MotionEvent event;
    protected WrapMotionEvent(MotionEvent event) {
        this.event = event;
    }
    static public WrapMotionEvent wrap(MotionEvent event) {
            try {
                return new EclairMotionEvent(event);
            } catch (VerifyError e) {
                return new WrapMotionEvent(event);
            }
    }
    public int getAction() {
            return event.getAction();
    }
    public float getX() {
            return event.getX();
    }
    public float getX(int pointerIndex) {
            verifyPointerIndex(pointerIndex);
            return getX();
    }
    public float getY() {
            return event.getY();
    }
    public float getY(int pointerIndex) {
            verifyPointerIndex(pointerIndex);
            return getY();
    }
    public int getPointerCount() {
            return 1;
    }
    public int getPointerId(int pointerIndex) {
            verifyPointerIndex(pointerIndex);
            return 0;
    }
    private void verifyPointerIndex(int pointerIndex) {
            if (pointerIndex > 0) {
                throw new IllegalArgumentException(
                    "Invalid pointer index for Donut/Cupcake");
            }
    }
}

public class EclairMotionEvent extends WrapMotionEvent {
    protected EclairMotionEvent(MotionEvent event) {
            super(event);
    }
    public float getX(int pointerIndex) {
            return event.getX(pointerIndex);
    }
    public float getY(int pointerIndex) {
            return event.getY(pointerIndex);
    }
    public int getPointerCount() {
            return event.getPointerCount();
    }
    public int getPointerId(int pointerIndex) {
            return event.getPointerId(pointerIndex);
    }
}

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