1.方法a：
public static String GetImageStr(String imgFilePath) {
if (imgFilePath == null || imgFilePath == "") {
return "";
}
File file = new File(imgFilePath);
if (!file.exists()) {
return "";
}
byte[] data = null;
try {
InputStream in = new FileInputStream(imgFilePath);
data = getByte(in);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
String imageString = Base64.encodeToString(data, Base64.DEFAULT);
return imageString;
}public static byte[] getByte(InputStream in) {
if (in == null) {
return null;
}
int sumSize = 0;
List<byte[]> totalBytes = new ArrayList<byte[]>();
byte[] buffer = new byte[1024];
int length = -1;
try {
while ((length = in.read(buffer)) != -1) {
sumSize += length;
byte[] tmp = new byte[length];
System.arraycopy(buffer, 0, tmp, 0, length);
totalBytes.add(tmp);
}
byte[] data = new byte[sumSize];
int start = 0;
for (byte[] tmp : totalBytes) {
System.arraycopy(tmp, 0, data, start, tmp.length);
start += tmp.length;
}
return data;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
方法b：
public static String getImageString(String imgFilePath){
String imageString = null;
Bitmap mBitmap=BitmapFactory.decodeFile(imgFilePath);
if(mBitmap!=null){
Matrix matrix = new Matrix();
int mWidth=mBitmap.getWidth();
int mHeight=mBitmap.getHeight();
float scaleWidth=(float)150/mWidth;
float scaleHeight=(float)150/mHeight;
Log.i("scale", scaleWidth+"++++++++++++"+scaleHeight);
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newBitmap=Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(), mBitmap.getHeight(), matrix, true);
ByteArrayOutputStream out=new ByteArrayOutputStream();
newBitmap.compress(CompressFormat.JPEG, 100, out);
byte []bytes=out.toByteArray();
imageString=Base64.encodeToString(bytes, Base64.DEFAULT);
System.out.println(imageString);
}
return imageString;
}