android 一些数据转换方法

package com.ai9475.util;

import android.content.Context;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.PixelFormat;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

/**

 * 数据格式转换工具类

 *

 * Created by ZHOUZ on 14-2-15.

 */

public class ZFormat

{

    private ZFormat() { }

    /**

     * 将byte[]转换成InputStream

     *

     * @param b

     * @return

     */

    public static InputStream byte2InputStream(byte[] b) {

        ByteArrayInputStream bais = new ByteArrayInputStream(b);

        return bais;

    }

    /**

     * 将InputStream转换成byte[]

     *

     * @param is

     * @return

     */

    public static byte[] inputStream2Bytes(InputStream is) {

        String str = "";

        byte[] readByte = new byte[1024];

        int readCount = -1;

        try {

            while ((readCount = is.read(readByte, 0, 1024)) != -1) {

                str += new String(readByte).trim();

            }

            return str.getBytes();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

    /**

     * 将Bitmap转换成InputStream

     *

     * @param bm

     * @return

     */

    public static InputStream bitmap2InputStream(Bitmap bm) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);

        InputStream is = new ByteArrayInputStream(baos.toByteArray());

        return is;

    }

    /**

     * 将Bitmap转换成InputStream

     *

     * @param bm

     * @param quality

     * @return

     */

    public static InputStream bitmap2InputStream(Bitmap bm, int quality) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        bm.compress(Bitmap.CompressFormat.PNG, quality, baos);

        InputStream is = new ByteArrayInputStream(baos.toByteArray());

        return is;

    }

    /**

     * 将InputStream转换成Bitmap

     *

     * @param is

     * @return

     */

    public static Bitmap inputStream2Bitmap(InputStream is) {

        return BitmapFactory.decodeStream(is);

    }

    // Drawable转换成InputStream

    public static InputStream drawable2InputStream(Drawable d) {

        Bitmap bitmap = drawable2Bitmap(d);

        return bitmap2InputStream(bitmap);

    }

    /**

     * InputStream转换成Drawable

     *

     * @param context

     * @param is

     * @return

     */

    public static Drawable inputStream2Drawable(Context context, InputStream is) {

        Bitmap bitmap = inputStream2Bitmap(is);

        return bitmap2Drawable(context, bitmap);

    }

    /**

     * Drawable转换成byte[]

     *

     * @param d

     * @return

     */

    public static byte[] drawable2Bytes(Drawable d) {

        Bitmap bitmap = drawable2Bitmap(d);

        return bitmap2Bytes(bitmap);

    }

    /**

     * byte[]转换成Drawable

     *

     * @param context

     * @param b

     * @return

     */

    public static Drawable bytes2Drawable(Context context, byte[] b) {

        Bitmap bitmap = bytes2Bitmap(b);

        return bitmap2Drawable(context, bitmap);

    }

    /**

     * Bitmap转换成byte[]

     *

     * @param bm

     * @return

     */

    public static byte[] bitmap2Bytes(Bitmap bm) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);

        return baos.toByteArray();

    }

    /**

     * byte[]转换成Bitmap

     *

     * @param b

     * @return

     */

    public static Bitmap bytes2Bitmap(byte[] b) {

        if (b.length != 0) {

            return BitmapFactory.decodeByteArray(b, 0, b.length);

        }

        return null;

    }

    /**

     * Drawable转换成Bitmap

     *

     * @param drawable

     * @return

     */

    public static Bitmap drawable2Bitmap(Drawable drawable) {

        Bitmap bitmap = Bitmap

                .createBitmap(

                        drawable.getIntrinsicWidth(),

                        drawable.getIntrinsicHeight(),

                        drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

                                : Bitmap.Config.RGB_565);

        Canvas canvas = new Canvas(bitmap);

        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),

                drawable.getIntrinsicHeight());

        drawable.draw(canvas);

        return bitmap;

    }

    /**

     * Bitmap转换成Drawable

     *

     * @param context

     * @param bitmap

     * @return

     */

    public static Drawable bitmap2Drawable(Context context, Bitmap bitmap) {

        Resources res = context.getResources();

        BitmapDrawable bd = new BitmapDrawable(res, bitmap);

        Drawable d = (Drawable) bd;

        return d;

    }

}