Imageswitcher中的Ontouch多點觸控縮放？

Question

我正在嘗試在圖像切換器上啟用捏縮放。 我現在被困在如何在 ontouch 方法中聲明 imageview 上。 I realize that the ImageView i = (Imageview) v is incorrect, I just dont know what to switch it to to declare the imageswitcher imageview in the ontouch... Here is my java and xml. 謝謝您的幫助！

public class ImageSwitch1 extends Activity implements
        AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory, OnTouchListener {

    Matrix matrix = new Matrix();
    Matrix eventMatrix = new Matrix();

    final static int NONE = 0;
    final static int DRAG = 1;
    final static int ZOOM = 2;
    int touchState = NONE;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.imageswitcher);

        mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
        mSwitcher.setFactory(this);
        mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));
        mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));


        Gallery g = (Gallery) findViewById(R.id.gallery);
        g.setAdapter(new ImageAdapter(this));
        g.setOnItemSelectedListener(this);




    }


    public void onItemSelected(AdapterView parent, View v, int position, long id) {

        final TextView tv = (TextView)findViewById(R.id.SwitcherText);
        mSwitcher.setImageResource(mImageIds[position]);
        tv.setText(mText[position]);

    }  
    public void onNothingSelected(AdapterView parent) {
    }

    public View makeView() {
        ImageView i = new ImageView(this);
        i.setScaleType(ScaleType.MATRIX);
        i.setBackgroundColor(0xFF000000);
        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,
                LayoutParams.MATCH_PARENT));
          i.setOnTouchListener(this);
        return i;
    }
    final static float MIN_DIST = 50;
    static float eventDistance = 0;
    static float centerX =0, centerY = 0;
    public boolean onTouch(View v, MotionEvent event) {
        ImageView i = (ImageView) v;
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
        //primary touch event starts: remember touch down location
        touchState = DRAG;
        centerX = event.getX(0);
        centerY = event.getY(0);
        eventMatrix.set(matrix);
        break;
        case MotionEvent.ACTION_POINTER_DOWN:
        //secondary touch event starts: remember distance and center
        eventDistance = calcDistance(event);
        calcMidpoint(centerX, centerY, event);
        if (eventDistance > MIN_DIST) {
        eventMatrix.set(matrix);
        touchState = ZOOM;
        }
        break;
        case MotionEvent.ACTION_MOVE:
            if (touchState == DRAG) {
            //single finger drag, translate accordingly
            matrix.set(eventMatrix);
            matrix.setTranslate(event.getX(0) - centerX,
            event.getY(0) - centerY);
            } else if (touchState == ZOOM) {
            //multi-finger zoom, scale accordingly around center
            float dist = calcDistance(event);
            if (dist > MIN_DIST) {
            matrix.set(eventMatrix);
            float scale = dist / eventDistance;
            matrix.postScale(scale, scale, centerX, centerY);
            }
            }
            // Perform the transformation
            i.setImageMatrix(matrix);
            break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_POINTER_UP:
            touchState = NONE;
            break;
            }
            return true;
            }
            private float calcDistance(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 calcMidpoint(float centerX, float centerY,
            MotionEvent event) {
            centerX = (event.getX(0) + event.getX(1))/2;
            centerY = (event.getY(0) + event.getY(1))/2;
            }    


    private ImageSwitcher mSwitcher;

    public class ImageAdapter extends BaseAdapter {
        public ImageAdapter(Context c) {
            mContext = c;
        }

        public int getCount() {
            return mThumbIds.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView i = new ImageView(mContext);

            i.setImageResource(mThumbIds[position]);
            i.setAdjustViewBounds(true);
            i.setLayoutParams(new Gallery.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            i.setBackgroundResource(R.drawable.picture_frame);


            return i;
        }
            private Context mContext;
    }

XML：

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


    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/Rellayout1"
        android:layout_width="match_parent" android:layout_height="match_parent" android:isScrollContainer="true">
        <RelativeLayout android:id="@+id/RelativeLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:isScrollContainer="true" android:layout_marginBottom="120dp"> 

            <ImageSwitcher android:layout_alignParentLeft="true" 
                android:layout_alignParentTop="true" 
                android:id="@+id/switcher"
                android:layout_width="match_parent"
                android:layout_height="match_parent" 
                android:layout_marginTop="60dp"
                >

            </ImageSwitcher>
            <Gallery android:spacing="16dp" android:layout_height="80dp" android:id="@+id/gallery" android:unselectedAlpha="0.5" android:background="#55000000" android:gravity="center_vertical" android:layout_width="match_parent" android:minHeight="20px"></Gallery>


        </RelativeLayout>
        <ScrollView
            android:id="@+id/ScrollViewSwitcher"
            android:layout_width="fill_parent" android:scrollbarAlwaysDrawVerticalTrack="true" android:isScrollContainer="true" android:layout_alignParentBottom="true" android:layout_height="120dp">
            <TextView android:scrollbarAlwaysDrawVerticalTrack="true" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/SwitcherText" android:textSize="18dp"></TextView>
        </ScrollView>
    </RelativeLayout>

Answer 1

我解決了這個問題，改變了這一行：

ImageView i = (ImageView) v;

經過

ImageView i = mSwitcher;

但不能使用矩陣，imageSwitcher 不使用矩陣或者我不知道它是如何完成的。

我希望能幫助你。