放大ViewPager ImageView？

我無法縮放ViewPager上的ImageView。放大ViewPager ImageView？

我的主要活動

public class ViewPagerMain extends AppCompatActivity { 

     ScaleGestureDetector scaleGestureDetector; 
     ImageView imageView; 
     Matrix matrix; 
     ViewPager viewPager; 
     private ViewPagerArrowIndicator viewPagerArrowIndicator; 
     Drawable rightarrow, leftarrow; 
     Button buttonnext, buttonprev; 


     @Override 
     protected void onCreate(@Nullable Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_viewpager); 
      buttonnext = (Button) findViewById(R.id.nexxt); 
      buttonprev = (Button) findViewById(R.id.prevv); 


      viewPager = (ViewPager) findViewById(R.id.view_pager); 
      // viewPagerArrowIndicator = (ViewPagerArrowIndicator) findViewById(R.id.viewPagerArrowIndicator); 
      imageView = (ImageView) findViewById(R.id.imageView); 
      CustomPagerAdapter customPagerAdapter = new CustomPagerAdapter(this); 
      viewPager.setAdapter(customPagerAdapter); 
      // viewPagerArrowIndicator.bind(viewPager); 
      // viewPagerArrowIndicator.setArrowIndicatorRes(R.drawable.ic_arrow_left, R.drawable.ic_arrow_right); 
      // rightarrow = getResources().getDrawable(R.drawable.ic_arrow_right); 
      // rightarrow.setColorFilter(getResources().getColor(R.color.RED), PorterDuff.Mode.SRC_ATOP); 
      // leftarrow = getResources().getDrawable(R.drawable.ic_arrow_left); 
      // leftarrow.setColorFilter(getResources().getColor(R.color.RED), PorterDuff.Mode.SRC_ATOP); 


      matrix = new Matrix(); 
      scaleGestureDetector = new ScaleGestureDetector(this, new ScaleListener()); 


      buttonnext.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        int currentItem = viewPager.getCurrentItem(); 
        viewPager.setCurrentItem(currentItem + 1); 
       } 
      }); 
      buttonprev.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        int currentItem = viewPager.getCurrentItem(); 
        viewPager.setCurrentItem(currentItem - 1); 
       } 
      }); 


     } 

     @Override 
     public boolean onTouchEvent(MotionEvent event) { 
      scaleGestureDetector.onTouchEvent(event); 
      return true; 
     } 

     private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { 

      @Override 
      public boolean onScale(ScaleGestureDetector detector) { 
       float SF = detector.getScaleFactor(); 
       SF = Math.max(0.1f, Math.min(SF, 0.5f)); 
       matrix.setScale(SF, SF); 
       imageView.setImageMatrix(matrix); 
       return true; 
      } 
     } 

    }

我PagerAdapter類

public class CustomPagerAdapter extends PagerAdapter { 
    Context mContext; 
    LayoutInflater mLayoutInflater; 
    int[] mResources = { 
      R.mipmap.page7, 
      R.mipmap.page8, 
      R.mipmap.page9, 
      R.mipmap.page10, 
      R.mipmap.page11, 
      R.mipmap.page12, 
      R.mipmap.page13, 
      R.mipmap.page14, 
      R.mipmap.page15, 
      R.mipmap.page16, 
      R.mipmap.page17, 
      R.mipmap.page18 
    }; 



    public CustomPagerAdapter(Context context) { 
     mContext = context; 
     mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

    } 


    @Override 
    public int getCount() { 
     return mResources.length; 
    } 

    @Override 
    public boolean isViewFromObject(View view, Object object) { 
     return view == ((RelativeLayout) object); 
    } 

    @Override 
    public Object instantiateItem(ViewGroup container, int position) { 
     View itemView = mLayoutInflater.inflate(R.layout.activity_pager_items, container, false); 
     ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView); 
     imageView.setImageResource(mResources[position]); 
     container.addView(itemView); 
     return itemView; 
    } 

    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
     container.removeView((RelativeLayout) object); 
    } 
}

我TouchViewPagerImageView類放大

public class TouchViewPagerImageView 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; 
    //static NonSwipeableViewPager PagerLeft; 
// Remember some things for zooming 
    PointF last = new PointF(); 
    PointF start = new PointF(); 
    float minScale = 1f; 
    float maxScale = 3f; 
    float[] m; 
    static boolean b = false, c = false; 
    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; 
    ViewGroup vp; 

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

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

    public void setChild(ViewGroup vp) { 
     this.vp = vp; 
    } 

    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() { 
      @SuppressWarnings("deprecation") 
      @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]; 
      /*Log.v("log_tag", event.getX()+" matrix " 
        + x);*/ 
       PointF curr = new PointF(event.getX(), event.getY()); 
       switch (event.getAction()) { 
        case MotionEvent.ACTION_DOWN: 
         TouchViewPagerImageView.b = false; 
         Log.v("event", "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) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "ACTION_MOVE scaleWidth < width y + deltaY > 0"); 
            deltaY = -y; 
           } else if (y + deltaY < -bottom) { 
            TouchViewPagerImageView.b = false; 
            Log.v("event", "else ACTION_MOVE scaleWidth < width y + deltaY < -bottom"); 
            deltaY = -(y + bottom); 
           } else { 
            TouchViewPagerImageView.b = false; 
           } 
          } else if (scaleHeight < height) { 
           deltaY = 0; 
           if (x + deltaX > 0) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "ACTION_MOVE scaleWidth < height x + deltaX > 0"); 
            deltaX = -x; 
           } else if (x + deltaX < -right) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "ACTION_MOVE scaleWidth < height x + deltaX < -right"); 
            deltaX = -(x + right); 
           } else { 
            TouchViewPagerImageView.b = false; 
           } 
          } else { 
           if (x + deltaX > 0) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "scaleWidth > width"); 
            deltaX = -x; 
           } else if (x + deltaX < -right) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "else scaleWidth > width"); 
            deltaX = -(x + right); 
           } else { 
            TouchViewPagerImageView.b = true; 
           } 
           if (y + deltaY > 0) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "y + deltaY"); 
            deltaY = -y; 
           } else if (y + deltaY < -bottom) { 
            TouchViewPagerImageView.b = true; 
            Log.v("event", "y + deltaY < -bottom"); 
            deltaY = -(y + bottom); 
           } else { 
            TouchViewPagerImageView.b = false; 
           } 
          } 
        /*Log.v("log_tag",height + " matrix " 
          + (int) getHeightFromMatrix(matrix, TouchImageView.this));*/ 
          matrix.postTranslate(deltaX, deltaY); 
          last.set(curr.x, curr.y); 
         } 
         break; 

        case MotionEvent.ACTION_UP: 
         Log.v("event", "ACTION_UP"); 
         TouchViewPagerImageView.b = true; 
         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) { 
          Log.v("event", "ACTION_UP xDiff < CLICK && yDiff < CLICK"); 
          performClick(); 
         } 
         break; 

        case MotionEvent.ACTION_POINTER_UP: 
         //TouchImageView.b = false; 
         Log.v("event", "ACTION_POINTER_UP"); 
         mode = NONE; 
         break; 
        case MotionEvent.ACTION_POINTER_3_DOWN: 
         Log.v("event", "ACTION_HOVER_MOVE"); 
         break; 
       } 
      /*getLayoutParams().height = (int) getWidthFromMatrix(matrix, 
        TouchImageView.this); 
      getLayoutParams().width = (int) getHeightFromMatrix(matrix, 
        TouchImageView.this);*/ 
       setImageMatrix(matrix); 
       invalidate(); 
       return true; 
      } 
     }); 
    } 

    @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; 
     } 

     @SuppressLint("NewApi") 
     @TargetApi(8) 
     @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); 
    } 

/*public static void setPager(NonSwipeableViewPager pagerLeft) { 
    PagerLeft = pagerLeft; 
}*/ 


}

我viewpager XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <ImageView 
     android:id="@+id/imageView" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:scaleType="fitXY" /> 


</RelativeLayout>

我在哪裏必須實現TouchViewPagerImageView類？

來源

2017-01-17 seon

變化的ImageView到TouchViewPagerImageView XML格式。 –

不能用imageView嗎？ – seon

試試這個：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <yourpackage_name.TouchViewPagerImageView 
     android:id="@+id/imageView" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:scaleType="fitXY" /> 
</RelativeLayout>

在

您my_viewpager xml

也是你的適配器類：

@Override 
    public Object instantiateItem(ViewGroup container, int position) { 
     TouchViewPagerImageView imgDisplay; 

     mLayoutInflater = (LayoutInflater) mContext 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View itemView = mLayoutInflater.inflate(R.layout.activity_pager_items, container, 
       false); 

     imgDisplay = (TouchViewPagerIMageView) itemView.findViewById(R.id.imageView); 
     imgDisplay.setImageResource(mResources(position)); 
     ((ViewPager) container).addView(itemView); 
     return itemView; 
    }

問題與您TouchViewPagerIMageView類

使用此代碼：

public class TouchViewPagerIMageView 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(); 
    } 
}

來源

2017-01-17 05:44:54 rafsanahmad007

沒有任何圖像顯示。當更改 – seon

檢查編輯的答案.. – rafsanahmad007

要麼這是 TouchImageView imgDisplay; 或 TouchViewPagerIMageView imgDisplay; – seon

你好這個庫可以幫助您放大圖像

https://github.com/chrisbanes/PhotoView

您可以使用此與內置IamgeView

ImageView mImageView; 
    PhotoViewAttacher mAttacher; 
    mImageView = (ImageView) findViewById(R.id.iv_photo); 
// Set the Drawable displayed 

    Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper); 
    mImageView.setImageDrawable(bitmap); 

// Attach a PhotoViewAttacher, which takes care of all of the zooming functionality. 
// (not needed unless you are going to change the drawable later) 

    mAttacher = new PhotoViewAttacher(mImageView); 

// If you later call mImageView.setImageDrawable/setImageBitmap/setImageResource/etc then you just need to call 

    mAttacher.update();

來源

2017-01-17 05:52:13 MilapTank

確定sir.i會嘗試 – seon

放大ViewPager ImageView？

回答

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