转载自http://glblong.blog.51cto.com/3058613/1304090
将view转为bitmap（一）
public static Bitmap getBitmapFromView(View view)
{
// Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
// Bind a canvas to it
Canvas canvas = new Canvas(returnedBitmap);
// Get the view's background
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
// has background drawable, then draw it on the canvas
bgDrawable.draw(canvas);
else
// does not have background drawable, then draw white background on
// the canvas
canvas.drawColor(Color.WHITE);
// draw the view on the canvas
view.draw(canvas);
// return the bitmap
return returnedBitmap;
}
将view转为bitmap（二）
public static Bitmap viewToBitmap(View view)
{
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bm = view.getDrawingCache();
return bm;
}
将xml转为bitmap
public static Bitmap convertBitmapFromXML(Context context, String clusterSize, Bitmap bm)
{
View layout = LayoutInflater.from(context).inflate(R.layout.estatecartlist_item, null);
View bitmapView = layout.findViewById(R.id.estatecartlist_item_bitmap);
TextView xml_text = (TextView) layout.findViewById(R.id.item_estatecart_tv_name);
ImageView image = (ImageView) layout.findViewById(R.id.item_estatecart_iv_main);
image.setImageBitmap(bm);
xml_text.setText(clusterSize);
bitmapView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
bitmapView.layout(0, 0, bitmapView.getMeasuredWidth(), bitmapView.getMeasuredHeight());
final Bitmap clusterBitmap = Bitmap.createBitmap(bitmapView.getMeasuredWidth(), bitmapView.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(clusterBitmap);
bitmapView.draw(canvas);
return clusterBitmap;
}
图片缩放与压缩
// 按大小缩放
private Bitmap getimage(String srcPath)
{
BitmapFactory.Options newOpts = new BitmapFactory.Options();
// 开始读入图片，此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);// 此时返回bm为空
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
// 现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
float hh = 800f;// 这里设置高度为800f
float ww = 480f;// 这里设置宽度为480f
// 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
int be = 1;// be=1表示不缩放
if (w > h && w > ww)
{// 如果宽度大的话根据宽度固定大小缩放
be = (int) (newOpts.outWidth / ww);
}
else if (w < h && h > hh)
{// 如果高度高的话根据宽度固定大小缩放
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0)
be = 1;
newOpts.inSampleSize = be;// 设置缩放比例
// 重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
return compressImage(bitmap);// 压缩好比例大小后再进行质量压缩
}
// 图片质量压缩
private static Bitmap compressImage(Bitmap image)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
int options = 100;
while (baos.toByteArray().length / 1024 > 100)
{ // 循环判断如果压缩后图片是否大于100kb,大于继续压缩
baos.reset();// 重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中
options -= 10;// 每次都减少10
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片
return bitmap;
}
// 图片按比例大小压缩
private static Bitmap comp(Bitmap image)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
if (baos.toByteArray().length / 1024 > 1024)
{// 判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出
baos.reset();// 重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG, 50, baos);// 这里压缩50%，把压缩后的数据存放到baos中
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
BitmapFactory.Options newOpts = new BitmapFactory.Options();
// 开始读入图片，此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
// 现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
float hh = 800f;// 这里设置高度为800f
float ww = 480f;// 这里设置宽度为480f
// 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
int be = 1;// be=1表示不缩放
if (w > h && w > ww)
{// 如果宽度大的话根据宽度固定大小缩放
be = (int) (newOpts.outWidth / ww);
}
else if (w < h && h > hh)
{// 如果高度高的话根据宽度固定大小缩放
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0)
be = 1;
newOpts.inSampleSize = be;// 设置缩放比例
// 重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
isBm = new ByteArrayInputStream(baos.toByteArray());
bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
return compressImage(bitmap);// 压缩好比例大小后再进行质量压缩
}
图片转为文件
public static boolean saveBitmap2file(Bitmap bmp, String filename)
{
CompressFormat format = Bitmap.CompressFormat.JPEG;
int quality = 100;
OutputStream stream = null;
try
{
stream = new FileOutputStream("/sdcard/" + filename);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
return bmp.compress(format, quality, stream);
}
屏幕截屏
// 屏幕截屏方法 获取当前屏幕bitmap,转换成bytes[] 调用 UI分享方法
public void printscreen_share(View v)
{
View view1 = getWindow().getDecorView();
Display display = getWindowManager().getDefaultDisplay();
view1.layout(0, 0, display.getWidth(), display.getHeight());
view1.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(view1.getDrawingCache());
}
把Bitmap转成Byte
public static byte[] Bitmap2Bytes(Bitmap bm)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
图片转为文件
public static boolean saveBitmap2file(Bitmap bmp)
{
CompressFormat format = Bitmap.CompressFormat.PNG;
int quality = 100;
OutputStream stream = null;
try
{
// 判断SDcard状态
if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
// 错误提示
return false;
}
// 检查SDcard空间
File SDCardRoot = Environment.getExternalStorageDirectory();
if (SDCardRoot.getFreeSpace() < 10000)
{
// 弹出对话框提示用户空间不够
Log.e("Utils", "存储空间不够");
return false;
}
// 在SDcard创建文件夹及文件
File bitmapFile = new File(SDCardRoot.getPath() + FILE_PATH);
bitmapFile.getParentFile().mkdirs();// 创建文件夹
stream = new FileOutputStream(SDCardRoot.getPath() + FILE_PATH);// "/sdcard/"
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
return bmp.compress(format, quality, stream);
}
下载图片
public static Bitmap loadImage(String... params)
{
InputStream is = null;
Bitmap bitmap = null;
try
{
URL url = new URL(params[0]);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(5000);
conn.setConnectTimeout(5000);
if (HttpURLConnection.HTTP_OK != conn.getResponseCode())
{
// 网络连接异常
Log.e("", "loadImage连接异常");
return null;
}
is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if (null != is)
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
return bitmap;
}
byte[]转换成Bitmap
public static Bitmap Bytes2Bitmap(byte[] b)
{
if (b.length != 0)
{
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
return null;
}
将字符串转换成Bitmap类型
public static Bitmap stringtoBitmap(String string)
{
// 将字符串转换成Bitmap类型
Bitmap bitmap = null;
try
{
byte[] bitmapArray;
bitmapArray = Base64.decode(string, Base64.DEFAULT);
bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length);
}
catch (Exception e)
{
e.printStackTrace();
}
return bitmap;
}
将Bitmap转换成字符串
public static String bitmaptoString(Bitmap bitmap)
{
String string = null;
ByteArrayOutputStream bStream = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG, 100, bStream);
byte[] bytes = bStream.toByteArray();
string = Base64.encodeToString(bytes, Base64.DEFAULT);
return string;
}
byte[]转为文件
public static File getFileFromBytes(byte[] b)
{
BufferedOutputStream stream = null;
File file = null;
try
{
// 判断SDcard状态
if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
// 错误提示
return null;
}
// 检查SDcard空间
File SDCardRoot = Environment.getExternalStorageDirectory();
if (SDCardRoot.getFreeSpace() < 10000)
{
// 弹出对话框提示用户空间不够
Log.e("Utils", "存储空间不够");
return null;
}
// 在SDcard创建文件夹及文件
File bitmapFile = new File(SDCardRoot.getPath() + FILE_PATH);
bitmapFile.getParentFile().mkdirs();// 创建文件夹
FileOutputStream fstream = new FileOutputStream(bitmapFile);
stream = new BufferedOutputStream(fstream);
stream.write(b);
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
if (stream != null)
{
try
{
stream.close();
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
return file;
}
图片压缩
//图片缩放
public static Bitmap scaleDownBitmap(Bitmap photo, int newHeight, Context context)
{
final float densityMultiplier = context.getResources().getDisplayMetrics().density;
int h = (int) (newHeight * densityMultiplier);
int w = (int) (h * photo.getWidth() / ((double) photo.getHeight()));
photo = Bitmap.createScaledBitmap(photo, w, h, true);
return photo;
}
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];
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（一）
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（二）
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)
{
return BitmapFactory.decodeStream(is);
}
Drawable转换成InputStream
public InputStream Drawable2InputStream(Drawable d)
{
Bitmap bitmap = this.drawable2Bitmap(d);
return this.Bitmap2InputStream(bitmap);
}
InputStream转换成Drawable
public Drawable InputStream2Drawable(InputStream is)
{
Bitmap bitmap = this.InputStream2Bitmap(is);
return this.bitmap2Drawable(bitmap);
}
Drawable转换成byte[]
public byte[] Drawable2Bytes(Drawable d)
{
Bitmap bitmap = this.drawable2Bitmap(d);
return this.Bitmap2Bytes(bitmap);
}
byte[]转换成Drawable
public Drawable Bytes2Drawable(byte[] b)
{
Bitmap bitmap = this.Bytes2Bitmap(b);
return this.bitmap2Drawable(bitmap);
}
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)
{
BitmapDrawable bd = new BitmapDrawable(bitmap);
Drawable d = (Drawable) bd;
return d;
}
bitmap灰度化（一）
public static Bitmap bitmap2Gray(Bitmap bitmap) {
//得到图片的长和宽
int width = bitmap.getWidth();
int height = bitmap.getHeight();
//创建目标灰度图像
Bitmap grayBitmap = null;
grayBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
//创建画布
Canvas c = new Canvas(grayBitmap);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
//将社彩饱和度设置为0
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
c.drawBitmap(bitmap, 0, 0, paint);
return grayBitmap;
}
bitmap灰度化（二）
public static Bitmap sharpenImageGary(Bitmap bitmap) {
long start = System.currentTimeMillis();
int height = bitmap.getHeight();
int width = bitmap.getWidth();
int[] pix = new int[width * height];
bitmap.getPixels(pix, 0, width, 0, 0, width, height);
int R, G, B;
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++) {
int index = y * width + x;
int r = (pix[index] >> 16) & 0xff;
int g = (pix[index] >> 8) & 0xff;
int b = pix[index] & 0xff;
int s = (r + g + b) / 3;
// 图像黑白化
R = s;
R = (R < 0) ? 0 : ((R > 255) ? 255 : R);
G = s;
G = (G < 0) ? 0 : ((G > 255) ? 255 : G);
B = s;
B = (B < 0) ? 0 : ((B > 255) ? 255 : B);
pix[index] = 0xff000000 | (R << 16) | (G << 8) | B;
}
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pix, 0, width, 0, 0, width, height);
pix = null;
long end = System.currentTimeMillis();
Log.e("图像黑白化", "used time=" + (end - start));
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
bitmap锐化（拉普拉斯变换）
public static Bitmap sharpenImageAmeliorate(Bitmap bmp){
long start = System.currentTimeMillis();
// 拉普拉斯矩阵
int[] laplacian = new int[] { -1, -1, -1, -1, 9, -1, -1, -1, -1 };
int width = bmp.getWidth();
int height = bmp.getHeight();
//Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
int pixR = 0;
int pixG = 0;
int pixB = 0;
int pixColor = 0;
int newR = 0;
int newG = 0;
int newB = 0;
int idx = 0;
float alpha = 0.3F;
int[] pixels = new int[width * height];
bmp.getPixels(pixels, 0, width, 0, 0, width, height);
for (int i = 1, length = height - 1; i < length; i++)
{
for (int k = 1, len = width - 1; k < len; k++)
{
idx = 0;
for (int m = -1; m <= 1; m++)
{
for (int n = -1; n <= 1; n++)
{
pixColor = pixels[(i + n) * width + k + m];
pixR = Color.red(pixColor);
pixG = Color.green(pixColor);
pixB = Color.blue(pixColor);
newR = newR + (int) (pixR * laplacian[idx] * alpha);
newG = newG + (int) (pixG * laplacian[idx] * alpha);
newB = newB + (int) (pixB * laplacian[idx] * alpha);
idx++;
}
}
newR = Math.min(255, Math.max(0, newR));
newG = Math.min(255, Math.max(0, newG));
newB = Math.min(255, Math.max(0, newB));
pixels[i * width + k] = Color.argb(255, newR, newG, newB);
newR = 0;
newG = 0;
newB = 0;
}
}
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
long end = System.currentTimeMillis();
Log.e("图片锐化", "used time="+(end - start));
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}