Android Bitmap与DrawAble与byte[]与InputStream之间的转换工具类

package com.yiban.caesar.Utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

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;

/**
* Bitmap与DrawAble与byte[]与InputStream之间的转换工具类
*
*/
public class IOFormat{
private static IOFormat tools = new IOFormat();

public static IOFormat getInstance(){
if (tools == null) {
tools = new IOFormat();
return tools;
}
return tools;
}

// 将byte[]转换成InputStream
public InputStream byte2InputStream(byte[] b){
ByteArrayInputStream bais = new ByteArrayInputStream(b);
return bais;
}

// 将InputStream转换成byte[]
public byte[] inputStream2Bytes(InputStream is){
String str = "";
byte[] readByte = new byte[1024];
@SuppressWarnings("unused")
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
public 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
public 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
public Bitmap inputStream2Bitmap(InputStream is){
if(is == null){
return null;
}
return BitmapFactory.decodeStream(is);
}

// Drawable转换成InputStream
public InputStream drawable2InputStream(Drawable d){
if(d == null){
return null;
}
Bitmap bitmap = this.drawable2Bitmap(d);
return this.bitmap2InputStream(bitmap);
}

// InputStream转换成Drawable
public Drawable inputStream2Drawable(InputStream is){
if(is == null){
return null;
}
Bitmap bitmap = this.inputStream2Bitmap(is);
return this.bitmap2Drawable(bitmap);
}

// Drawable转换成byte[]
public byte[] drawable2Bytes(Drawable d){
if(d == null){
return null;
}
Bitmap bitmap = this.drawable2Bitmap(d);
return this.bitmap2Bytes(bitmap);
}

// byte[]转换成Drawable
public Drawable bytes2Drawable(byte[] b){
if(b == null){
return null;
}
Bitmap bitmap = this.bytes2Bitmap(b);
return this.bitmap2Drawable(bitmap);
}

// Bitmap转换成byte[]
public byte[] bitmap2Bytes(Bitmap bm){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}

// byte[]转换成Bitmap
public Bitmap bytes2Bitmap(byte[] b){
if (b.length != 0) {
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
return null;
}

// Drawable转换成Bitmap
public 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
public Drawable bitmap2Drawable(Bitmap bitmap){
@SuppressWarnings("deprecation")
BitmapDrawable bd = new BitmapDrawable(bitmap);
Drawable d = (Drawable) bd;
return d;
}
}