Android 之 ImageView修剪

来源：互联网发布：凯哥java 编辑：程序博客网时间：2024/06/08 16:47

public class ClipImageBorder extends View {    //水平，垂直方向与View的边距 private int mHorizontalPadding = 20,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 ClipImageBorder(Context context) {        this(context,null,0);    }    public ClipImageBorder(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public ClipImageBorder(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        //计算padding的px        mHorizontalPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mHorizontalPadding, getResources().getDisplayMetrics());        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距        mVerticalpadding = (getHeight() - mWidth)/2;        mPaint.setColor(Color.parseColor("#aa000000"));        mPaint.setStyle(Paint.Style.FILL);        //绘制左边        canvas.drawRect(0, 0, mHorizontalPadding, getHeight(), mPaint);        //绘制右边        canvas.drawRect(getWidth() - mHorizontalPadding,0,getWidth(),getHeight(),mPaint);        //绘制上边        canvas.drawRect(mHorizontalPadding,0,getWidth() - mHorizontalPadding,mVerticalpadding,mPaint);        //绘制下边        canvas.drawRect(mHorizontalPadding,getHeight() - mVerticalpadding,getWidth() - mHorizontalPadding,getHeight(),mPaint);        //绘制外边框        mPaint.setColor(mBorderColor);        mPaint.setStrokeWidth(mBorderWidth);        mPaint.setStyle(Paint.Style.STROKE);        canvas.drawRect(mHorizontalPadding,mVerticalpadding,getWidth()-mHorizontalPadding,getHeight()-mVerticalpadding,mPaint);    }    public void setHorizontalPadding(int mHorizontalPadding) {        this.mHorizontalPadding = mHorizontalPadding;    }    /**     * 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,                mVerticalpadding, getWidth() - 2 * mHorizontalPadding,                getWidth() - 2 * mHorizontalPadding);    }}

two

public class zoomImageView 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;    public zoomImageView(Context context) {        this(context, null);    }    public zoomImageView(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) {                            zoomImageView.this.postDelayed(                                    new AutoScaleRunnable(SCALE_MID, x, y), 16);                            isAutoScale = true;                        } else {                            zoomImageView.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     *     * @author zhy     */    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))) {                zoomImageView.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;            }        }    }

three

public class ClipImageLayout extends RelativeLayout {    private zoomImageView mZoomImageView;    private ClipImageBorder mClipImageView;    private int mHorizontalPadding = 20;    public ClipImageLayout(Context context, AttributeSet attrs) {        super(context, attrs);        mZoomImageView = new zoomImageView(context);        mClipImageView = new ClipImageBorder(context);        LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);        mZoomImageView.setImageDrawable(getResources().getDrawable(R.mipmap.a));        this.addView(mZoomImageView, lp);        this.addView(mClipImageView,lp);        //计算padding的px        mHorizontalPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mHorizontalPadding, getResources().getDisplayMetrics());        mClipImageView.setHorizontalPadding(mHorizontalPadding);        mZoomImageView.setHorizontalPadding(mHorizontalPadding);    }    //对外公布设置边距的方法，单位dp    public void setHorizontalPadding(int mHorizontalPadding){        this.mHorizontalPadding = mHorizontalPadding;    }    //裁切图片    public Bitmap clip(){        return mZoomImageView.clip();    }}

布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.administrator.testapplication.Main2Activity"    >    <com.example.administrator.testapplication.ClipImageLayout        android:id="@+id/clipImgeLayout"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        >    </com.example.administrator.testapplication.ClipImageLayout>    <ImageView        android:id="@+id/image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:visibility="gone"        /></RelativeLayout>

menu布局

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android"><item android:id="@+id/action_clip"    android:icon="@mipmap/ic_action_github"    android:showAsAction="always|withText"    android:title="裁剪"    /></menu>

public class Main2Activity extends Activity {private ClipImageLayout clipImageBorder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);  //      requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main2);        clipImageBorder = (ClipImageLayout) findViewById(R.id.clipImgeLayout);}    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main,menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()){            case R.id.action_clip:                ByteArrayOutputStream baos = new ByteArrayOutputStream();                Bitmap bitmap = clipImageBorder.clip();                bitmap.compress(Bitmap.CompressFormat.JPEG, 100,baos);                byte[] datas = baos.toByteArray();               setContentView(R.layout.show_image);               ImageView imageView = (ImageView) findViewById(R.id.imageView);                Bitmap bitmap1 = BitmapFactory.decodeByteArray(datas, 0, datas.length);                if(bitmap1 != null){                    imageView.setImageBitmap(bitmap1);                    imageView.setVisibility(View.VISIBLE);                }                break;        }        return super.onOptionsItemSelected(item);    }}

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