本文介绍了如何保存图像从画布code在Android应用程序？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经创建了的OnDraw（Canvas）的一个形象，我试图以保存图像，但它不是Working.image保存有大小为零。在这里，我的编码
私人诠释瓦;
私人诠释H;
@覆盖保护无效onSizeChanged（INT W，INT小时，INT oldw，INT oldh）
{
this.w = W;
this.h = H;
super.onSizeChanged（W，H，oldw，oldh）;
}
@覆盖
保护无效的OnDraw（帆布油画）
{
// TODO自动生成方法存根
位图toDisk = Bitmap.createBitmap（W，H，Bitmap.Config.ARGB_8888）;
canvas.setBitmap（toDisk）;
涂料粉刷=新的油漆（）;
位图MYBITMAP = BitmapFactory.de codeResource（getResources（），R.drawable.ban_background）;
位图resizeImage1 = Bitmap.createScaledBitmap（MYBITMAP，590350，假）;
canvas.drawColor（Color.BLACK）;
canvas.drawBitmap（resizeImage1,10,5，NULL）;
paint.setStyle（Paint.Style.FILL）;
paint.setAntiAlias（真正的）;
paint.setTextSize（25）;
paint.setColor（Color.BLUE）;
paint.setFakeBoldText（真正的）;
位图的图标;
位图ICON1;
位图图标2;
尝试{//获取参考AssetManager
AssetManager mngr = getAssets（）;
//创建一个输入流，资产文件夹阅读
InputStream的插件= mngr.open（imageName +PNG）;
图标= BitmapFactory.de codeStream（INS）;
位图icon9 = Bitmap.createScaledBitmap（图标，590250，假）;
canvas.drawBitmap（icon9,1,60，NULL）;
canvas.save（）;
如果（isCamera）
{
ICON1 = BitmapFactory.de codeByteArray（pictureByte，0，pictureByte.length）;
位图resizeImage = Bitmap.createScaledBitmap（icon1,150,170，假）;
canvas.drawBitmap（resizeImage，400100，NULL）;
canvas.save（）;
}
如果（isPhotoGallery）
{
位图myBitmap1 = BitmapFactory.de codeFILE（selectedImagePath）;
位图resizeImage = Bitmap.createScaledBitmap（myBitmap1,150,170，假）;
canvas.drawBitmap（resizeImage，400100，NULL）;
}
如果（isImageSearch）
{
图标2 = BitmapFactory.de codeByteArray（pictureByte，0，pictureByte.length）;
canvas.drawBitmap（icon2,10,10，NULL）;
}
paint.setTextSize（30）;
canvas.drawText（CameraText，100175，油漆）;
getDrawingCache（）的COM preSS（Bitmap.Com pressFormat.JPEG，100，新的FileOutputStream（新文件（到/ mnt / SD卡/ arun.jpg）））。
}赶上（例外五）{
Log.e（错误---------＆gt;中，e.toString（））;
}
//位图toDisk = Bitmap.createBitmap（resizeImage1）;
//小号canvas.setBitmap（toDisk）; / * code ... * /
尝试 {
toDisk.com preSS（Bitmap.Com pressFormat.JPEG，100，新的FileOutputStream（新文件（到/ mnt / SD卡/ arun.jpg）））;
}赶上（FileNotFoundException异常E）{
// TODO自动生成的catch块
e.printStackTrace（）;
}
解决方案
试试这个：
私人诠释瓦;
私人诠释H;
@覆盖
保护无效onSizeChanged（INT W，INT小时，INT oldw，诠释oldh）{
this.w = W;
this.h = H;
super.onSizeChanged（W，H，oldw，oldh）;
}
保护无效的OnDraw（帆布油画）
{
位图toDisk = Bitmap.createBitmap（W，H，Bitmap.Config.ARGB_8888）;
canvas.setBitmap（toDisk）;
/ * code ... * /
toDisk.com preSS（Bitmap.Com pressFormat.JPEG，100，新的FileOutputStream（新文件（到/ mnt / SD卡/ arun.jpg）））;
/ * code ... * /
}
I have created a image in OnDraw(Canvas),i tried to Save that Image But its Not Working.image is Saved with Zero size.Here my coding
private int w;
private int h;
@Override protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
this.w = w;
this.h = h;
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas)
{
// TODO Auto-generated method stub
Bitmap toDisk = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);
canvas.setBitmap(toDisk);
Paint paint = new Paint();
Bitmap myBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.ban_background);
Bitmap resizeImage1=Bitmap.createScaledBitmap(myBitmap,590,350,false);
canvas.drawColor(Color.BLACK);
canvas.drawBitmap(resizeImage1,10,5, null);
paint.setStyle(Paint.Style.FILL);
paint.setAntiAlias(true);
paint.setTextSize(25);
paint.setColor(Color.BLUE);
paint.setFakeBoldText(true);
Bitmap icon;
Bitmap icon1;
Bitmap icon2;
try { // Get reference to AssetManager
AssetManager mngr = getAssets();
// Create an input stream to read from the asset folder
InputStream ins = mngr.open(imageName+".png");
icon = BitmapFactory.decodeStream(ins);
Bitmap icon9=Bitmap.createScaledBitmap(icon,590,250,false);
canvas.drawBitmap(icon9,1,60, null);
canvas.save();
if(isCamera)
{
icon1 = BitmapFactory.decodeByteArray(pictureByte, 0,pictureByte.length);
Bitmap resizeImage=Bitmap.createScaledBitmap(icon1,150,170,false);
canvas.drawBitmap(resizeImage,400,100, null);
canvas.save();
}
if(isPhotoGallery)
{
Bitmap myBitmap1 = BitmapFactory.decodeFile(selectedImagePath);
Bitmap resizeImage=Bitmap.createScaledBitmap(myBitmap1,150,170,false);
canvas.drawBitmap(resizeImage,400,100, null);
}
if(isImageSearch)
{
icon2= BitmapFactory.decodeByteArray(pictureByte, 0,pictureByte.length);
canvas.drawBitmap(icon2,10,10, null);
}
paint.setTextSize(30);
canvas.drawText(CameraText, 100,175, paint);
getDrawingCache().compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg")));
} catch (Exception e) {
Log.e("Error--------->", e.toString());
}
// Bitmap toDisk = Bitmap.createBitmap(resizeImage1);
//s canvas.setBitmap(toDisk); /* code... */
try {
toDisk.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg")));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
解决方案
Try this:
private int w;
private int h;
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
this.w = w;
this.h = h;
super.onSizeChanged(w, h, oldw, oldh);
}
protected void onDraw(Canvas canvas)
{
Bitmap toDisk = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);
canvas.setBitmap(toDisk);
/* code... */
toDisk.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg")));
/* code... */
}
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