Android Pinch-und Zoom-Bild in der Tätigkeit

Ich habe eine ListView mit einer Reihe von Bildern. Beim anklicken einer von Ihnen, der angeklickte Bild erscheint nun in einem neuen Tätigkeitsfeld und das Zentrum der Aktivität in der Bildansicht, auch ist es eine Zoombare. Das Problem ist, wenn ich das Bild vergrößern, es gewinnt, Zoom, sondern bewegt sich auch wie drag-and-drop. Sollte ich zu beseitigen, die Bewegung des Bildes und sollte nur zoomable aus der Mitte der Aktivität.

ZoomInZoomOutActivity.java

public class ZoomInZoomOutActivity extends Activity implements OnTouchListener 
{
    private static final String TAG = "Touch";
    @SuppressWarnings("unused")
    private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f;

    Matrix matrix = new Matrix();
    Matrix savedMatrix = new Matrix();
    static final int NONE = 0;
    static final int DRAG = 1;
    static final int ZOOM = 2;
    int mode = NONE;
    PointF start = new PointF();
    PointF mid = new PointF();
    float oldDist = 1f;
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.imagedisp);

        Bundle extras = getIntent().getExtras();

        long id =extras.getLong("ID");
        String s=String.valueOf(id);
        ImageView view;
        view = (ImageView) findViewById(R.id.imageView1);
        view.setOnTouchListener(this);

        if (s.equals("0")) 
        {
            view.setImageResource(R.drawable.img1);
        }
        else if (s.equals("1"))
        {
            view.setImageResource(R.drawable.img2);
        }
        else if (s.equals("2"))
        {
            view.setImageResource(R.drawable.img3);
        } 
        else 
        {
            view.setImageResource(R.drawable.img4);
        }

    }


    public boolean onTouch(View v, MotionEvent event) 
    {
        ImageView view = (ImageView) v;
        view.setScaleType(ImageView.ScaleType.MATRIX);
        float scale;

        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_UP:

            case MotionEvent.ACTION_POINTER_UP:

                                                mode = NONE;
                                                Log.d(TAG, "mode=NONE");
                                                break;

            case MotionEvent.ACTION_POINTER_DOWN: 

                                                oldDist = spacing(event);
                                                Log.d(TAG, "oldDist=" + oldDist);
                                                if (oldDist > 5f) {
                                                    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 > 5f) 
                                                    {
                                                        matrix.set(savedMatrix);
                                                        scale = newDist / oldDist; 
                                                        matrix.postScale(scale, scale, mid.x, mid.y);
                                                    }
                                                }
                                                break;
        }

        view.setImageMatrix(matrix); 
        return true; 
    }



    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);
    }


    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);
    }

}

imagedisp.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:gravity="center">

    <ImageView android:layout_width="fill_parent" 
        android:id="@+id/imageView1"
        android:src="@drawable/img1" 
        android:layout_height="fill_parent"
        android:scaleType="centerInside">

    </ImageView>

</LinearLayout>

InformationsquelleAutor suresh cheemalamudi | 2012-11-03

  1. 9

    Versuchen, diesen code:

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

/**
 * Extends Android ImageView to include pinch zooming and panning.
 */
public class TouchImageView extends ImageView
{
    Matrix matrix = 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 last = new PointF();
    PointF start = new PointF();
    float minScale = 1f;
    float maxScale = 3f;
    float[] m;

    float redundantXSpace, redundantYSpace;

    float width, height;
    static final int CLICK = 3;
    float saveScale = 1f;
    float right, bottom, origWidth, origHeight, bmWidth, bmHeight;

    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.setTranslate(1f, 1f);
        m = new float[9];
        setImageMatrix(matrix);
        setScaleType(ScaleType.MATRIX);

        setOnTouchListener(new OnTouchListener()
        {
            @Override
            public boolean onTouch(View v, MotionEvent event)
            {
                mScaleDetector.onTouchEvent(event);

                matrix.getValues(m);
                float x = m[Matrix.MTRANS_X];
                float y = m[Matrix.MTRANS_Y];
                PointF curr = new PointF(event.getX(), event.getY());

                switch (event.getAction())
                {
                    case MotionEvent.ACTION_DOWN:
                        last.set(event.getX(), event.getY());
                        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 scaleWidth = Math.round(origWidth * saveScale);
                            float scaleHeight = Math.round(origHeight * saveScale);
                            if (scaleWidth < width)
                            {
                                deltaX = 0;
                                if (y + deltaY > 0)
                                    deltaY = -y;
                                else if (y + deltaY < -bottom)
                                    deltaY = -(y + bottom);
                            }
                            else if (scaleHeight < height)
                            {
                                deltaY = 0;
                                if (x + deltaX > 0)
                                    deltaX = -x;
                                else if (x + deltaX < -right)
                                    deltaX = -(x + right);
                            }
                            else
                            {
                                if (x + deltaX > 0)
                                    deltaX = -x;
                                else if (x + deltaX < -right)
                                    deltaX = -(x + right);

                                if (y + deltaY > 0)
                                    deltaY = -y;
                                else if (y + deltaY < -bottom)
                                    deltaY = -(y + bottom);
                            }
                            matrix.postTranslate(deltaX, deltaY);
                            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
            }
        });
    }

    @Override
    public void setImageBitmap(Bitmap bm)
    {
        super.setImageBitmap(bm);
        if (bm != null)
        {
            bmWidth = bm.getWidth();
            bmHeight = bm.getHeight();
        }
    }

    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 = (float) Math.min(
                    Math.max(.95f, detector.getScaleFactor()), 1.05);
            float origScale = saveScale;
            saveScale *= mScaleFactor;
            if (saveScale > maxScale)
            {
                saveScale = maxScale;
                mScaleFactor = maxScale / origScale;
            }
            else if (saveScale < minScale)
            {
                saveScale = minScale;
                mScaleFactor = minScale / origScale;
            }
            right = width * saveScale - width - (2 * redundantXSpace * saveScale);
            bottom = height * saveScale - height
                    - (2 * redundantYSpace * saveScale);
            if (origWidth * saveScale <= width || origHeight * saveScale <= height)
            {
                matrix.postScale(mScaleFactor, mScaleFactor, width / 2, height / 2);
                if (mScaleFactor < 1)
                {
                    matrix.getValues(m);
                    float x = m[Matrix.MTRANS_X];
                    float y = m[Matrix.MTRANS_Y];
                    if (mScaleFactor < 1)
                    {
                        if (Math.round(origWidth * saveScale) < width)
                        {
                            if (y < -bottom)
                                matrix.postTranslate(0, -(y + bottom));
                            else if (y > 0)
                                matrix.postTranslate(0, -y);
                        }
                        else
                        {
                            if (x < -right)
                                matrix.postTranslate(-(x + right), 0);
                            else if (x > 0)
                                matrix.postTranslate(-x, 0);
                        }
                    }
                }
            }
            else
            {
                matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(),
                        detector.getFocusY());
                matrix.getValues(m);
                float x = m[Matrix.MTRANS_X];
                float y = m[Matrix.MTRANS_Y];
                if (mScaleFactor < 1)
                {
                    if (x < -right)
                        matrix.postTranslate(-(x + right), 0);
                    else if (x > 0)
                        matrix.postTranslate(-x, 0);
                    if (y < -bottom)
                        matrix.postTranslate(0, -(y + bottom));
                    else if (y > 0)
                        matrix.postTranslate(0, -y);
                }
            }
            return true;
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = MeasureSpec.getSize(widthMeasureSpec);
        height = MeasureSpec.getSize(heightMeasureSpec);
        //Fit to screen.
        float scale;
        float scaleX = (float) width / (float) bmWidth;
        float scaleY = (float) height / (float) bmHeight;
        scale = Math.min(scaleX, scaleY);
        matrix.setScale(scale, scale);
        setImageMatrix(matrix);
        saveScale = 1f;

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

        matrix.postTranslate(redundantXSpace, redundantYSpace);

        origWidth = width - 2 * redundantXSpace;
        origHeight = height - 2 * redundantYSpace;
        right = width * saveScale - width - (2 * redundantXSpace * saveScale);
        bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
        setImageMatrix(matrix);
    }
}
    Ich versuchte diesen code, aber egal was Bild src-ich wähle, es zeigt immer an, bis leer...
    Wenn ich dich richtig verstanden haben, leeren Platz über dem Bildansicht, so können Sie android:adjustViewBounds="true" zu Ihrem Bildansicht in Ihrer xml-layout.
    Eigentlich ist der komplette Bildansicht wird leer, nichts zeigt, bis
    Versuchen Sie meine - Projekt auf GitHub. Es verwendet diese Klasse zu implementieren, die zwei-Finger-zoom-Funktion in der Galerie. Bild-Quelle - Vermögen. Aber Sie realisieren auch andere Quellen: SD-Karte, drawable Ordner, etc.
    Ich gebe das mal probieren. Jetzt im mit eine Quelle, das ist in meinem drawable-Ordner.

    InformationsquelleAutor Artyom Kiriliyk

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