android圖片縮放，拖拽

Jcheng一霸 · 發(fā)表于 2013-8-28 16:27

6
yi 工具類(lèi)
[java] package com.lin.image;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.Rect;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ImageView;

public class MyImageView extends ImageView {
private Matrix mMatrix;
private float bWidth;// 圖片寬度
private float bHeight;

private int dWidth;//屏幕寬度
private int  dHeight;//屏幕高度
private float initScale;
private float mScale;
private float scale;
ImageState mapState = new ImageState();
private float oldDist;
PointF mStart = new PointF();
private Bitmap mBitmap;
float[] values = new float[9];

Matrix initMatrix;
Matrix mSavedMatrix;

public MyImageView(Context context) {
      super(context);
      this.setScaleType(ScaleType.MATRIX);
}
public void init(MotionEvent event){
      mStart.set(event.getX(), event.getY());
      mSavedMatrix.set(mMatrix);

}
float rate=1.0f;
   // 刷新界面
public void setView() {
      //rate=rate/10*9;
      // UserUtils.log(TAG, "set view", "set view");
      //mMatrix.postScale(scale,scale,0,0);
      this.setImageMatrix(mMatrix);

      Rect rect = this.getDrawable().getBounds();
      this.getImageMatrix().getValues(values);
      bWidth = rect.width() * values[0];
      bHeight = rect.height() * values[0];

      mapState.left = values[2];
      mapState.top = values[5];
      mapState.right = mapState.left + bWidth;
      mapState.bOTTom = mapState.top + bHeight;
}
private float s=0.9f;
public void setScale(){

      float sX = dWidth / 2;
      float sY = dHeight / 2;

   mMatrix.postScale(s, s, sX, sY);
   setView();
}
public void setScreenSize(Context context, int width, int height,Bitmap bitmap) {
      mBitmap =bitmap;
      dWidth = width;
      dHeight = height;
      setImageBitmap(mBitmap);
//       gd = new GestureDetector(context, new LearnGestureListener());

      bWidth = mBitmap.getWidth();
      bHeight = mBitmap.getHeight();
      // mView = (ImageView) findViewById(R.id.imageView);
      float xScale = (float) dWidth / bWidth;
      float yScale = (float) dHeight / bHeight;
      mScale = xScale <= yScale ? xScale : yScale;
   scale = mScale < 1 ? mScale : 1;
      initScale = scale;
      mMatrix = new Matrix();
      mSavedMatrix = new Matrix();
      System.out.println("dwidth==="+dHeight+"  bHeight===="+bHeight);
      // 平移
      mMatrix.postTranslate((dWidth - bWidth) / 2, (dHeight - bHeight) / 2);

      float sX = dWidth / 2;
      float sY = dHeight / 2;

      mSavedMatrix.set(mMatrix);
   mMatrix.postScale(scale, scale, sX, sY);
      setView();
}

/** 計(jì)算移動(dòng)距離 */
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);
}
float backScale;
//縮放
public void zoom(MotionEvent event) {

      float newDist = spacing(event);
      if((mapState.right-mapState.left)>4*dWidth&&newDist>oldDist)
         return;
      Log.e("lin","oldDist="+oldDist+",newDist=="+newDist);
      if (newDist > 10f&&Math.abs((newDist-oldDist))>10f) {
         scale = newDist / oldDist;
         if (scale < 1) {
            mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
         } else {
            mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
         }
         oldDist=newDist;
      }

      setView();
}

/**
   * @return the oldDist
   */
public float getOldDist(MotionEvent event) {
      this.oldDist = this.spacing(event);
      if (oldDist > 10f) {
            mSavedMatrix.set(mMatrix);
      }
      backScale=oldDist;
      Log.e("lin","oldDist="+oldDist);
      return oldDist;
}
public void backScale(){
      scale = backScale / oldDist;
      if (scale < 1) {
      // mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
      } else {
         if(mapState.right-mapState.left<=dWidth){
               scale= dWidth/(mapState.right-mapState.left);

               mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
                  float h=(dHeight-(mapState.bottom-mapState.top))/2;
                  float w=(dWidth-(mapState.right-mapState.left))/2;
                  mMatrix.postTranslate(w-mapState.left,h-mapState.top);
         }
      }
      setView();
}
public void backDrag(){
      if (mapState.left >= 0 || mapState.right <= dWidth
            ||mapState.top >= 0 || mapState.bottom <= dHeight) {
         float h=(dHeight-(mapState.bottom-mapState.top))/2;
         float w=(dWidth-(mapState.right-mapState.left))/2;
         mMatrix.postTranslate(w-mapState.left,h-mapState.top);
         setView();
      }
}
//拖動(dòng)
public void drag(MotionEvent event){
      //Log.i
      Log.e("lin","left="+mapState.left+",right="+mapState.right
            +",top="+mapState.top+",bottom="+mapState.bottom);

      mMatrix.set(mSavedMatrix);
      if ((mapState.left <= 0 || mapState.right >= dWidth)
            && (mapState.top <= 0 || mapState.bottom >= dHeight)) {
         mMatrix.postTranslate(event.getX() - mStart.x, event.getY()
                  - mStart.y);
      } else if (mapState.top <= 0 || mapState.bottom >= dHeight) {
         mMatrix.postTranslate(0, event.getY() - mStart.y);
      } else if (mapState.left <= 0 || mapState.right >= dWidth) {
         mMatrix.postTranslate(event.getX() - mStart.x, 0);
      }
      else{
            mMatrix.postTranslate(event.getX() - mStart.x, event.getY()-mStart.y);
      }
      //mStart.x=event.getX();
   // mStart.y=event.getY();
      setView();

}
private class ImageState {
      private float left;
      private float top;
      private float right;
      private float bottom;
}
}
package com.lin.image;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.Rect;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ImageView;
public class MyImageView extends ImageView {
private Matrix mMatrix;
private float bWidth;// 圖片寬度
private float bHeight;

private int dWidth;//屏幕寬度
private int  dHeight;//屏幕高度
private float initScale;
private float mScale;
private float scale;
ImageState mapState = new ImageState();
private float oldDist;
PointF mStart = new PointF();
private Bitmap mBitmap;
float[] values = new float[9];

Matrix initMatrix;
Matrix mSavedMatrix;

public MyImageView(Context context) {
  super(context);
   this.setScaleType(ScaleType.MATRIX);
}
public void init(MotionEvent event){
      mStart.set(event.getX(), event.getY());
      mSavedMatrix.set(mMatrix);

}
float rate=1.0f;
  // 刷新界面
public void setView() {
   //rate=rate/10*9;
      // UserUtils.log(TAG, "set view", "set view");
   //mMatrix.postScale(scale,scale,0,0);
      this.setImageMatrix(mMatrix);

      Rect rect = this.getDrawable().getBounds();
      this.getImageMatrix().getValues(values);
      bWidth = rect.width() * values[0];
      bHeight = rect.height() * values[0];
      mapState.left = values[2];
      mapState.top = values[5];
      mapState.right = mapState.left + bWidth;
      mapState.bottom = mapState.top + bHeight;
}
private float s=0.9f;
public void setScale(){

      float sX = dWidth / 2;
      float sY = dHeight / 2;
   mMatrix.postScale(s, s, sX, sY);
   setView();
}
public void setScreenSize(Context context, int width, int height,Bitmap bitmap) {
   mBitmap =bitmap;
   dWidth = width;
      dHeight = height;
      setImageBitmap(mBitmap);
//       gd = new GestureDetector(context, new LearnGestureListener());
      bWidth = mBitmap.getWidth();
      bHeight = mBitmap.getHeight();
      // mView = (ImageView) findViewById(R.id.imageView);
      float xScale = (float) dWidth / bWidth;
      float yScale = (float) dHeight / bHeight;
      mScale = xScale <= yScale ? xScale : yScale;
   scale = mScale < 1 ? mScale : 1;
      initScale = scale;
      mMatrix = new Matrix();
      mSavedMatrix = new Matrix();
      System.out.println("dwidth==="+dHeight+"  bHeight===="+bHeight);
      // 平移
      mMatrix.postTranslate((dWidth - bWidth) / 2, (dHeight - bHeight) / 2);
      float sX = dWidth / 2;
      float sY = dHeight / 2;

      mSavedMatrix.set(mMatrix);
   mMatrix.postScale(scale, scale, sX, sY);
      setView();
}

/** 計(jì)算移動(dòng)距離 */
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);
}
float backScale;
//縮放
public void zoom(MotionEvent event) {
      float newDist = spacing(event);
   if((mapState.right-mapState.left)>4*dWidth&&newDist>oldDist)
   return;
      Log.e("lin","oldDist="+oldDist+",newDist=="+newDist);
      if (newDist > 10f&&Math.abs((newDist-oldDist))>10f) {
         scale = newDist / oldDist;
         if (scale < 1) {
            mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
         } else {
            mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
         }
         oldDist=newDist;
      }
      setView();
}

/**
   * @return the oldDist
   */
public float getOldDist(MotionEvent event) {
      this.oldDist = this.spacing(event);
      if (oldDist > 10f) {
            mSavedMatrix.set(mMatrix);
      }
      backScale=oldDist;
      Log.e("lin","oldDist="+oldDist);
      return oldDist;
}
public void backScale(){
   scale = backScale / oldDist;
      if (scale < 1) {
      // mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
      } else {
      if(mapState.right-mapState.left<=dWidth){
         scale= dWidth/(mapState.right-mapState.left);

         mMatrix.postScale(scale, scale, dWidth / 2, dHeight / 2);
            float h=(dHeight-(mapState.bottom-mapState.top))/2;
            float w=(dWidth-(mapState.right-mapState.left))/2;
         mMatrix.postTranslate(w-mapState.left,h-mapState.top);
      }
      }
setView();
}
public void backDrag(){
      if (mapState.left >= 0 || mapState.right <= dWidth
            ||mapState.top >= 0 || mapState.bottom <= dHeight) {
      float h=(dHeight-(mapState.bottom-mapState.top))/2;
      float w=(dWidth-(mapState.right-mapState.left))/2;
   mMatrix.postTranslate(w-mapState.left,h-mapState.top);
   setView();
      }
}
//拖動(dòng)
public void drag(MotionEvent event){
   //Log.i
   Log.e("lin","left="+mapState.left+",right="+mapState.right
   +",top="+mapState.top+",bottom="+mapState.bottom);
      mMatrix.set(mSavedMatrix);
      if ((mapState.left <= 0 || mapState.right >= dWidth)
            && (mapState.top <= 0 || mapState.bottom >= dHeight)) {
         mMatrix.postTranslate(event.getX() - mStart.x, event.getY()
                  - mStart.y);
      } else if (mapState.top <= 0 || mapState.bottom >= dHeight) {
         mMatrix.postTranslate(0, event.getY() - mStart.y);
      } else if (mapState.left <= 0 || mapState.right >= dWidth) {
         mMatrix.postTranslate(event.getX() - mStart.x, 0);
      }
      else{
         mMatrix.postTranslate(event.getX() - mStart.x, event.getY()-mStart.y);
      }
      //mStart.x=event.getX();
   // mStart.y=event.getY();
      setView();

}
private class ImageState {
      private float left;
      private float top;
      private float right;
      private float bottom;
}
}

二， Activity[java] package com.lin.image;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;

public class ImageScaleActivity extends Activity {
/** Called when the activity is first created. */
   MyImageView image;
@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      image=new MyImageView(this);
      Bitmap bmp=((BitmapDrawable)getResources().getDrawable(R.drawable.totallist)).getBitmap();
      image.setScreenSize(this,getWindowManager().getDefaultDisplay().getWidth(),
         getWindowManager().getDefaultDisplay().getHeight(),bmp);
      setContentView(image);
}
private static final int DRAG=10;
private static final int  NULL=0;
private static final int SCALE=11;
private int mode;
private float mStartX;
@Override
public boolean onTouchEvent(MotionEvent event) {
      // TODO Auto-generated method stub
      switch (event.getAction()) {
      case  MotionEvent.ACTION_DOWN:
         Log.i("lin","down");
         mode=DRAG;

         mStartX = event.getRawX();
         image.init(event);
         break;
      case MotionEvent.ACTION_MOVE:
         if(mode==SCALE)
            image.zoom(event);
         if(mode==DRAG){
                  image.drag(event);
                  return true;
         }
         break;
      case MotionEvent.ACTION_UP:
         Log.i("lin","up");
         if(mode==SCALE){
            image.backScale();
            mode=NULL;
         }
         else if(mode==DRAG){
            image.backDrag();
         }
         break;
      case MotionEvent.ACTION_POINTER_1_DOWN:
         Log.i("lin","down1");
         break;
      case MotionEvent.ACTION_POINTER_2_DOWN:
         Log.i("lin","down2");
         image.getOldDist(event);
         mode=SCALE;
         break;
      case MotionEvent.ACTION_POINTER_2_UP:
         Log.i("lin","up2");

      default:
         break;
      }

      return super.onTouchEvent(event);
}
private float calculate(float x1,  float x2) {

      float pz = x1 - x2;// 計(jì)算兩點(diǎn)間的距離
      return pz;
}
}
package com.lin.image;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
public class ImageScaleActivity extends Activity {
/** Called when the activity is first created. */
MyImageView image;
@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      image=new MyImageView(this);
      Bitmap bmp=((BitmapDrawable)getResources().getDrawable(R.drawable.totallist)).getBitmap();
      image.setScreenSize(this,getWindowManager().getDefaultDisplay().getWidth(),
      getWindowManager().getDefaultDisplay().getHeight(),bmp);
      setContentView(image);
}
private static final int DRAG=10;
private static final int  NULL=0;
private static final int SCALE=11;
private int mode;
private float mStartX;
@Override
public boolean onTouchEvent(MotionEvent event) {
   // TODO Auto-generated method stub
   switch (event.getAction()) {
   case  MotionEvent.ACTION_DOWN:
   Log.i("lin","down");
   mode=DRAG;
      mStartX = event.getRawX();
         image.init(event);
   break;
   case MotionEvent.ACTION_MOVE:
   if(mode==SCALE)
   image.zoom(event);
   if(mode==DRAG){
                  image.drag(event);
                  return true;
   }
   break;
   case MotionEvent.ACTION_UP:
   Log.i("lin","up");
   if(mode==SCALE){
   image.backScale();
   mode=NULL;
   }
   else if(mode==DRAG){
   image.backDrag();
   }
   break;
   case MotionEvent.ACTION_POINTER_1_DOWN:
   Log.i("lin","down1");
   break;
   case MotionEvent.ACTION_POINTER_2_DOWN:
   Log.i("lin","down2");
   image.getOldDist(event);
   mode=SCALE;
   break;
      case MotionEvent.ACTION_POINTER_2_UP:
      Log.i("lin","up2");
  default:
break;
  }
   return super.onTouchEvent(event);
}
private float calculate(float x1,  float x2) {
      float pz = x1 - x2;// 計(jì)算兩點(diǎn)間的距離
      return pz;
}
}

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android圖片縮放，拖拽

android圖片縮放，拖拽

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