仿微信头像图片裁剪并压缩到100K以下到本地

逻辑：1、打开本地相机-并传入path路径
          2、在onActivityResult中，判断File(path)是否为空,不为空则跳转到下个界面
          PS：这里为什么要用path而不用onActivity返回的bitmap对象呢。 因为返回的bitmap对象是没有path路径的图片清晰
          3、利用ClipImageLayout来对图片进行裁剪--并获取到裁剪完毕之后的图片    
     4、对图片进行质量压缩，并保存到本地

     PS:第四部的时候，一定要压缩之后们通过流的方式保存到本地,不要在调用BitmapFactory.decodeStream方法，否则又会回到200K

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
      private File file; // 要保存的文件sss
      private Button btnCamera;

      @Override
      protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
            setContentView(R.layout. activity_main);
             btnCamera = (Button) findViewById(R.id. btn_camera);

             btnCamera.setOnClickListener( new OnClickListener() {

                   @Override
                   public void onClick(View v) {
                         file = new File(FileUtils.getImgStorageDirectory() + "/aa.jpg");
                        Intent intent = new Intent();
                        intent.setAction( "android.media.action.IMAGE_CAPTURE");
                        Uri uri = Uri. fromFile(file);
                        intent.putExtra(MediaStore. EXTRA_OUTPUT, uri);
                        startActivityForResult(intent, 100);

                  }
            });

      }

      @Override
      protected void onActivityResult( int requestCode, int resultCode, Intent data) {
             super.onActivityResult(requestCode, resultCode, data);
             if (requestCode == 100 && file.exists() && file.length() > 0) {
                   // 这里吧文件的路径传入到下一个界面，就是裁剪的界面
                  Intent intent = new Intent(MainActivity. this, CropActivity.class);
                  intent.putExtra( "path", file.getPath());
                  startActivity(intent);
            }
      }

}


第二个界面：裁剪的界面：
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.example.ima.view.ClipImageLayout;

public class CropActivity extends Activity implements OnClickListener {
      private Button btn;
      private ClipImageLayout mClipImageLayout;
      private String path;

      @Override
      protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
            setContentView(R.layout. activity_crop);
             path = getIntent().getStringExtra( "path");
             btn = (Button) findViewById(R.id. crop_button);
             btn.setOnClickListener(CropActivity. this);
             mClipImageLayout = (ClipImageLayout) findViewById(R.id.clipImageLayout );

             // 有的系统返回的图片是旋转了，有的没有旋转，所以处理
             int degreee = ImageUtil. readPictureDegree(path);
            Bitmap bitmap = ImageUtil. getSmallBitmap(path);
             if (bitmap != null) {
                   if (degreee == 0) {
                         mClipImageLayout.setImageBitmap(bitmap);
                  } else {
                         mClipImageLayout.setImageBitmap(ImageUtil. rotaingBitmap(degreee, bitmap));
                  }
            }

      }

      @Override
      public void onClick(View v) {
             //得到裁剪的图片
            Bitmap bitmap = mClipImageLayout.clip();
            String imageName = String.valueOf(System.currentTimeMillis());
             //这里把裁剪过后的图片进行质量压缩，并且保存到本地
            ImageUtil. compressAndSave(bitmap, imageName);
            Intent intent = new Intent(CropActivity. this, ShowActivity.class);
            intent.putExtra( "imageName", imageName);
            startActivity(intent);
      }

}
这个类的布局文件：


    

    




主要的三个View文件：

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.RelativeLayout;

/**
 * @ClassName: ClipImageLayout
 * @Description:
 * @date 2015 -5 -10 下午10:22:24
 */
public class ClipImageLayout extends RelativeLayout {
      private ClipZoomImageView mZoomImageView;
      private ClipImageBorderView mClipImageView;
      private int mHorizontalPadding = 0; // 这里测试，直接写死了大小，真正使用过程中，可以提取为自定义属性

      public ClipImageLayout(Context context, AttributeSet attrs) {
             super(context, attrs);

             mZoomImageView = new ClipZoomImageView(context);
             mClipImageView = new ClipImageBorderView(context);

            android.view.ViewGroup.LayoutParams lp = new LayoutParams(
                        android.view.ViewGroup.LayoutParams. MATCH_PARENT,
                        android.view.ViewGroup.LayoutParams. MATCH_PARENT);

             this.addView( mZoomImageView, lp);
             this.addView( mClipImageView, lp);

             // 计算padding的px
             mHorizontalPadding = ( int) TypedValue. applyDimension(
                        TypedValue. COMPLEX_UNIT_DIP, mHorizontalPadding, getResources()
                                    .getDisplayMetrics());
             mZoomImageView.setHorizontalPadding( mHorizontalPadding);
             mClipImageView.setHorizontalPadding( mHorizontalPadding);
      }

      public void setImageDrawable(Drawable drawable) {
             mZoomImageView.setImageDrawable(drawable);
      }

      public void setImageBitmap(Bitmap bitmap) {
             mZoomImageView.setImageBitmap(bitmap);
      }

      /**
       *对外公布设置边距的方法,单位为 dp
       *
       * @param mHorizontalPadding
       */
      public void setHorizontalPadding( int mHorizontalPadding) {
             this. mHorizontalPadding = mHorizontalPadding;
      }

      /**
       * 裁切图片
       *
       * @return
       */
      public Bitmap clip() {
             return mZoomImageView.clip();
      }
}



import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

public class ClipImageBorderView extends View {
      /**
       * 水平方向与View的边距
       */
      private int mHorizontalPadding;
      /**
       * 垂直方向与View的边距
       */
      private int mVerticalPadding;
      /**
       * 绘制的矩形的宽度
       */
      private int mWidth;
      /**
       * 边框的颜色，默认为白色
       */
      private int mBorderColor = Color.parseColor("#FFFFFF" );
      /**
       * 边框的宽度单位 dp
       */
      private int mBorderWidth = 1;

      private Paint mPaint;

      public ClipImageBorderView(Context context) {
             this(context, null);
      }

      public ClipImageBorderView(Context context, AttributeSet attrs) {
             this(context, attrs, 0);
      }

      public ClipImageBorderView(Context context, AttributeSet attrs, int defStyle) {
             super(context, attrs, defStyle);

             mBorderWidth = ( int) TypedValue. applyDimension(
                        TypedValue. COMPLEX_UNIT_DIP, mBorderWidth, getResources()
                                    .getDisplayMetrics());
             mPaint = new Paint();
             mPaint.setAntiAlias( true);
      }

      @Override
      protected void onDraw(Canvas canvas) {
             super.onDraw(canvas);
             // 计算矩形区域的宽度
             mWidth = getWidth() - 2 * mHorizontalPadding;
             // 计算距离屏幕垂直边界 的边据
             mVerticalPadding = (getHeight() - mWidth) / 2;
             mPaint.setColor(Color. parseColor("#aa000000"));
             mPaint.setStyle(Style. FILL);
             // 绘制左边1
            canvas.drawRect(0, 0, mHorizontalPadding, getHeight(), mPaint);
             // 绘制右边2
            canvas.drawRect(getWidth() - mHorizontalPadding, 0, getWidth(),
                        getHeight(), mPaint);
             // 绘制上边3
            canvas.drawRect( mHorizontalPadding, 0, getWidth() - mHorizontalPadding,
                         mVerticalPadding, mPaint);
             // 绘制下边4
            canvas.drawRect( mHorizontalPadding, getHeight() - mVerticalPadding,
                        getWidth() - mHorizontalPadding, getHeight(), mPaint);
             // 绘制外边框
             mPaint.setColor( mBorderColor);
             mPaint.setStrokeWidth( mBorderWidth);
             mPaint.setStyle(Style. STROKE);
            canvas.drawRect( mHorizontalPadding, mVerticalPadding, getWidth()
                        - mHorizontalPadding, getHeight() - mVerticalPadding, mPaint );

      }

      public void setHorizontalPadding( int mHorizontalPadding) {
             this. mHorizontalPadding = mHorizontalPadding;
      }
}



import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.ScaleGestureDetector.OnScaleGestureListener;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewTreeObserver;
import android.widget.ImageView;

/**
 * 缩放图片的View
 *
 */
public class ClipZoomImageView extends ImageView implements
            OnScaleGestureListener, OnTouchListener,
            ViewTreeObserver.OnGlobalLayoutListener {
      public static float SCALE_MAX = 4.0f;
      private static float SCALE_MID = 2.0f;

      /**
       * 初始化时的缩放比例，如果图片宽或高大于屏幕，此值将小于0
       */
      private float initScale = 1.0f;
      private boolean once = true;

      /**
       * 用于存放矩阵的9个值
       */
      private final float[] matrixValues = new float[9];

      /**
       * 缩放的手势检测
       */
      private ScaleGestureDetector mScaleGestureDetector = null;
      private final Matrix mScaleMatrix = new Matrix();

      /**
       * 用于双击检测
       */
      private GestureDetector mGestureDetector;
      private boolean isAutoScale;

      private int mTouchSlop;

      private float mLastX;
      private float mLastY;

      private boolean isCanDrag;
      private int lastPointerCount;
      /**
       * 水平方向与View的边距
       */
      private int mHorizontalPadding;

      public ClipZoomImageView(Context context) {
             this(context, null);
      }

      public ClipZoomImageView(Context context, AttributeSet attrs) {
             super(context, attrs);

            setScaleType(ScaleType. MATRIX);
             mGestureDetector = new GestureDetector(context,
                         new SimpleOnGestureListener() {
                               @Override
                               public boolean onDoubleTap(MotionEvent e) {
                                     if ( isAutoScale == true)
                                           return true;

                                     float x = e.getX();
                                     float y = e.getY();
                                     if (getScale() < SCALE_MID) {
                                          ClipZoomImageView. this.postDelayed(
                                                       new AutoScaleRunnable(SCALE_MID, x, y), 16);
                                           isAutoScale = true;
                                    } else {
                                          ClipZoomImageView. this.postDelayed(
                                                       new AutoScaleRunnable(initScale, x, y), 16);
                                           isAutoScale = true;
                                    }

                                     return true;
                              }
                        });
             mScaleGestureDetector = new ScaleGestureDetector(context, this);
             this. setOnTouchListener(this);
      }

      /**
       * 自动缩放的任务
       *
       */
      private class AutoScaleRunnable implements Runnable {
             static final float BIGGER = 1.07f;
             static final float SMALLER = 0.93f;
             private float mTargetScale;
             private float tmpScale;

             /**
             * 缩放的中心
             */
             private float x;
             private float y;

             /**
             * 传入目标缩放值，根据目标值与当前值，判断应该放大还是缩小
             *
             * @param targetScale
             */
             public AutoScaleRunnable( float targetScale, float x, float y) {
                   this. mTargetScale = targetScale;
                   this. x = x;
                   this. y = y;
                   if (getScale() < mTargetScale) {
                         tmpScale = BIGGER;
                  } else {
                         tmpScale = SMALLER;
                  }

            }

             @Override
             public void run() {
                   // 进行缩放
                   mScaleMatrix.postScale( tmpScale, tmpScale, x, y);
                  checkBorder();
                  setImageMatrix( mScaleMatrix);

                   final float currentScale = getScale();
                   // 如果值在合法范围内，继续缩放
                   if ((( tmpScale > 1f) && (currentScale < mTargetScale))
                              || (( tmpScale < 1f) && ( mTargetScale < currentScale))) {
                        ClipZoomImageView. this.postDelayed( this, 16);
                  } else
                   // 设置为目标的缩放比例
                  {
                         final float deltaScale = mTargetScale / currentScale;
                         mScaleMatrix.postScale(deltaScale, deltaScale, x, y);
                        checkBorder();
                        setImageMatrix( mScaleMatrix);
                         isAutoScale = false;
                  }

            }
      }

      @Override
      public boolean onScale(ScaleGestureDetector detector) {
             float scale = getScale();
             float scaleFactor = detector.getScaleFactor();

             if (getDrawable() == null)
                   return true;

             /**
             * 缩放的范围控制
             */
             if ((scale < SCALE_MAX && scaleFactor > 1.0f)
                        || (scale > initScale && scaleFactor < 1.0f)) {
                   /**
                   * 最大值最小值判断
                   */
                   if (scaleFactor * scale < initScale) {
                        scaleFactor = initScale / scale;
                  }
                   if (scaleFactor * scale > SCALE_MAX) {
                        scaleFactor = SCALE_MAX / scale;
                  }
                   /**
                   * 设置缩放比例
                   */
                   mScaleMatrix.postScale(scaleFactor, scaleFactor,
                              detector.getFocusX(), detector.getFocusY());
                  checkBorder();
                  setImageMatrix( mScaleMatrix);
            }
             return true;
      }

      /**
       * 根据当前图片的Matrix获得图片的范围
       *
       * @return
       */
      private RectF getMatrixRectF() {
            Matrix matrix = mScaleMatrix;
            RectF rect = new RectF();
            Drawable d = getDrawable();
             if ( null != d) {
                  rect.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
                  matrix.mapRect(rect);
            }
             return rect;
      }

      @Override
      public boolean onScaleBegin(ScaleGestureDetector detector) {
             return true;
      }

      @Override
      public void onScaleEnd(ScaleGestureDetector detector) {
      }

      @Override
      public boolean onTouch(View v, MotionEvent event) {
             if ( mGestureDetector.onTouchEvent(event))
                   return true;
             mScaleGestureDetector.onTouchEvent(event);

             float x = 0, y = 0;
             // 拿到触摸点的个数
             final int pointerCount = event.getPointerCount();
             // 得到多个触摸点的x与y均值
             for ( int i = 0; i < pointerCount; i++) {
                  x += event.getX(i);
                  y += event.getY(i);
            }
            x = x / pointerCount;
            y = y / pointerCount;

             /**
             * 每当触摸点发生变化时，重置mLasX , mLastY
             */
             if (pointerCount != lastPointerCount) {
                   isCanDrag = false;
                   mLastX = x;
                   mLastY = y;
            }

             lastPointerCount = pointerCount;
             switch (event.getAction()) {
             case MotionEvent. ACTION_MOVE:
                   float dx = x - mLastX;
                   float dy = y - mLastY;

                   if (! isCanDrag) {
                         isCanDrag = isCanDrag(dx, dy);
                  }
                   if ( isCanDrag) {
                         if (getDrawable() != null) {

                              RectF rectF = getMatrixRectF();
                               // 如果宽度小于屏幕宽度，则禁止左右移动
                               if (rectF.width() <= getWidth() - mHorizontalPadding * 2) {
                                    dx = 0;
                              }

                               // 如果高度小雨屏幕高度，则禁止上下移动
                               if (rectF.height() <= getHeight() - getHVerticalPadding()
                                          * 2) {
                                    dy = 0;
                              }
                               mScaleMatrix.postTranslate(dx, dy);
                              checkBorder();
                              setImageMatrix( mScaleMatrix);
                        }
                  }
                   mLastX = x;
                   mLastY = y;
                   break;

             case MotionEvent. ACTION_UP:
             case MotionEvent. ACTION_CANCEL:
                   lastPointerCount = 0;
                   break;
            }

             return true;
      }

      /**
       * 获得当前的缩放比例
       *
       * @return
       */
      public final float getScale() {
             mScaleMatrix.getValues( matrixValues);
             return matrixValues[Matrix. MSCALE_X];
      }

      @Override
      protected void onAttachedToWindow() {
             super.onAttachedToWindow();
            getViewTreeObserver().addOnGlobalLayoutListener( this);
      }

      @Override
      protected void onDetachedFromWindow() {
             super.onDetachedFromWindow();
            getViewTreeObserver(). removeGlobalOnLayoutListener( this);
      }

      /**
       * 垂直方向与View的边距
       */
      // private int getHVerticalPadding();

      @Override
      public void onGlobalLayout() {
             if ( once) {
                  Drawable d = getDrawable();
                   if (d == null)
                         return;

                   int width = getWidth();
                   int height = getHeight();
                   // 拿到图片的宽和高
                   int drawableW = d.getIntrinsicWidth();
                   int drawableH = d.getIntrinsicHeight();
                   float scale = 1.0f;

                   int frameSize = getWidth() - mHorizontalPadding * 2;

                   // 大图
                   if (drawableW > frameSize && drawableH < frameSize) {
                        scale = 1.0f * frameSize / drawableH;
                  } else if (drawableH > frameSize && drawableW < frameSize) {
                        scale = 1.0f * frameSize / drawableW;
                  } else if (drawableW > frameSize && drawableH > frameSize) {
                         float scaleW = frameSize * 1.0f / drawableW;
                         float scaleH = frameSize * 1.0f / drawableH;
                        scale = Math. max(scaleW, scaleH);
                  }

                   // 太小的图片放大处里
                   if (drawableW < frameSize && drawableH > frameSize) {
                        scale = 1.0f * frameSize / drawableW;
                  } else if (drawableH < frameSize && drawableW > frameSize) {
                        scale = 1.0f * frameSize / drawableH;
                  } else if (drawableW < frameSize && drawableH < frameSize) {
                         float scaleW = 1.0f * frameSize / drawableW;
                         float scaleH = 1.0f * frameSize / drawableH;
                        scale = Math. max(scaleW, scaleH);
                  }

                   initScale = scale;
                   SCALE_MID = initScale * 2;
                   SCALE_MAX = initScale * 4;
                   mScaleMatrix.postTranslate((width - drawableW) / 2,
                              (height - drawableH) / 2);
                   mScaleMatrix.postScale(scale, scale, getWidth() / 2,
                              getHeight() / 2);

                   // 图片移动至屏幕中心
                  setImageMatrix( mScaleMatrix);
                   once = false;
            }
      }

      /**
       * 剪切图片，返回剪切后的bitmap对象
       *
       * @return
       */
      public Bitmap clip() {
            Bitmap bitmap = Bitmap. createBitmap(getWidth(), getHeight(),
                        Bitmap.Config. ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            draw(canvas);
             return Bitmap. createBitmap(bitmap, mHorizontalPadding,
                        getHVerticalPadding(), getWidth() - 2 * mHorizontalPadding,
                        getWidth() - 2 * mHorizontalPadding);
      }

      /**
       * 边界检测
       */
      private void checkBorder() {
            RectF rect = getMatrixRectF();
             float deltaX = 0;
             float deltaY = 0;

             int width = getWidth();
             int height = getHeight();

             // 如果宽或高大于屏幕，则控制范围 ; 这里的0.001是因为精度丢失会产生问题，但是误差一般很小，所以我们直接加了一个0.01
             if (rect.width() + 0.01 >= width - 2 * mHorizontalPadding) {
                   if (rect. left > mHorizontalPadding) {
                        deltaX = -rect. left + mHorizontalPadding;
                  }

                   if (rect. right < width - mHorizontalPadding) {
                        deltaX = width - mHorizontalPadding - rect.right;
                  }
            }

             if (rect.height() + 0.01 >= height - 2 * getHVerticalPadding()) {
                   if (rect. top > getHVerticalPadding()) {
                        deltaY = -rect. top + getHVerticalPadding();
                  }

                   if (rect. bottom < height - getHVerticalPadding()) {
                        deltaY = height - getHVerticalPadding() - rect.bottom;
                  }
            }

             mScaleMatrix.postTranslate(deltaX, deltaY);
      }

      /**
       * 是否是拖动行�?
       *
       * @param dx
       * @param dy
       * @return
       */
      private boolean isCanDrag( float dx, float dy) {
             return Math. sqrt((dx * dx) + (dy * dy)) >= mTouchSlop;
      }

      public void setHorizontalPadding( int mHorizontalPadding) {
             this. mHorizontalPadding = mHorizontalPadding;
      }

      private int getHVerticalPadding() {
             return (getHeight() - (getWidth() - 2 * mHorizontalPadding)) / 2;
      }
}

DEMO下载地址：http://download.csdn.net/detail/q908555281/9311177