DrawableUtil.java

package com.arialyy.frame.util;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class DrawableUtil {

    /**
     * View 转换为bitmap
     *
     * @param v
     * @return
     */
    public static Bitmap convertViewToBitmap(View v) {
        v.setDrawingCacheEnabled(true);
        v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());

        v.buildDrawingCache(true);
        Bitmap b = Bitmap.createBitmap(v.getDrawingCache());
        v.setDrawingCacheEnabled(false); // clear drawing cache
        return b;
    }

    /**
     * 收缩图片
     *
     * @param drawable
     * @param w
     * @param h
     * @return
     */
    public static Drawable zoomDrawable(Drawable drawable, int w, int h) {
        int    width       = drawable.getIntrinsicWidth();
        int    height      = drawable.getIntrinsicHeight();
        Bitmap oldbmp      = drawableToBitmap(drawable);
        Matrix matrix      = new Matrix();
        float  scaleWidth  = ((float) w / width);
        float  scaleHeight = ((float) h / height);
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,
                matrix, true);
        return new BitmapDrawable(null, newbmp);
    }

    /**
     * drawable转bitMap
     *
     * @param drawable
     * @return
     */
    public static Bitmap drawableToBitmap(Drawable drawable) {
        int width  = drawable.getIntrinsicWidth();
        int height = drawable.getIntrinsicHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
                .getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                : Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, width, height);
        drawable.draw(canvas);
        return bitmap;

    }

    /**
     * BitMap2Byte
     *
     * @param bitmap
     * @return
     */
    public static byte[] getBitmapByte(Bitmap bitmap) {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
        try {
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }

    /**
     * Byte2BitMap
     *
     * @param temp
     * @return
     */
    public static Bitmap getBitmapFromByte(byte[] temp) {
        if (temp != null) {
            Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);
            return bitmap;
        } else {
            return null;
        }
    }

}