Drawable互转Bitmap
Drawable转Bitmap
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Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.myimage);
BitmapDrawable bd = (BitmapDrawable) d;
Bitmap bm = bd.getBitmap();
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public static Bitmap drawableToBitmap(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);
//canvas.setBitmap(bitmap);
drawable.setBounds(
0,
0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}
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Bitmap转Drawable
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Bitmap bm=xxx;
//xxx根据你的情况获取
BitmapDrawable bd=BitmapDrawable(bm);
BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。
mPicPath
//本地图片路径转成Bitmap格式
Bitmap pic = BitmapFactory.decodeFile(
this.mPicPath);
image.setImageBitmap(pic);
转成Bitmap格式
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String与InputStream相互转换
String to InputStream
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String str =
"String与InputStream相互转换";
InputStream in_nocode =
new ByteArrayInputStream(str.getBytes());
InputStream in_withcode =
new ByteArrayInputStream(str.getBytes(
"UTF-8"));
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InputStream to String
这里提供几个方法。
方法1：
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public String convertStreamToString(InputStream is) {
BufferedReader reader =
new BufferedReader(
new InputStreamReader(is));
StringBuilder sb =
new StringBuilder();
String line =
null;
try {
while ((line = reader.readLine()) !=
null) {
sb.append(line +
"/n");
}
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
is.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
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方法2：
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public String inputStream2String (InputStream in) throws IOException {
StringBuffer out =
new StringBuffer();
byte[] b =
new
byte[
4096];
for (
int n; (n = in.read(b)) != -
1;) {
out.append(
new String(b,
0, n));
}
return out.toString();
}
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方法3：
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public static String inputStream2String(InputStream is) throws IOException{
ByteArrayOutputStream baos =
new ByteArrayOutputStream();
int i=-
1;
while((i=is.read())!=-
1){
baos.write(i);
}
return baos.toString();
}
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Bitmap 和 byte[]互转
Bitmap → byte[]
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private
byte[] Bitmap2Bytes(Bitmap bm){
ByteArrayOutputStream baos =
new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG,
100, baos);
return baos.toByteArray(); }
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byte[] → Bitmap
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private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=
0){
return BitmapFactory.decodeByteArray(b,
0, b.length);
}
else {
return
null;
}
}
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