Go语言视频零基础入门到精通

因爲今生

       已将图片保存到drawable目录下  
       通过图片id获得Drawable  

java代码： Resource res=gerResource();

Drawable drawable=res.getDrawable(id);//id为R.drawable.图片名称



//通过图片id获得Bitmap

Resource res=gerResource();

Bitmap bitmap=BitmapFactory.decodeResource(res, id);

//若只知道图片的名称，可以通过图片的名称获得图片的id

//name:图片的名称 defType：图片的类型（png,jpeg),defPackage:工程的包名



int id =int id =res.getIdentifier(name, defType, defPackage);





//获得id之后可以根据你的需要来获得Bitmap或Drawable



//2,已将图片保存到assest目录下

//知道图片的名称，通过inputstream打开图片



AssetManager asm=getAssetMg();

InputStream is=asm.open(name);//name:图片的名称

//获得Drawable

Drawable da = Drawable.createFromStream(is, null);



//获得Bitmap

Bitmap bitmap=BitmapFactory.decodeStream(is);



//3,图片保存在sdcard,已知图片的路径

//图片路径

String path = Environment.getExternalStorageDirectory().toString()+ "/DCIM/device.png";

RandomAccessFile mMiniThumbFile；

File imgfile = new File(path);

try {

mMiniThumbFile = new RandomAccessFile(imgfile, "rw");

} catch (IOException ex) {



// Open as read-only so we can at least read the existing

// thumbnails.



try {

mMiniThumbFile = new RandomAccessFile(imgfile, "r");

} catch (IOException ex2) {

// ignore exception



System.out.println(ex2.toString());

}

}



data= new byte[10553];

try {

mMiniThumbFile.seek(0);

int got = mMiniThumbFile.read(data, 0, 10552);

System.out.println("got="+got);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println(e.toString());



}

if (data != null) {

//通过data获得bitmap

Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,data.length);
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