Android笔记：bitmap转换与处理相关工具类,Bitmap与DrawAble与byte[]与InputStream之间的转换
1.将view转为bitmap
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// 将view转为bitmappublic 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;} |
2.将view转为bitmap
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// 将view转为bitmappublic static Bitmap viewToBitmap(View view){ view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bm = view.getDrawingCache(); return bm;} |
3.将xml转为bitmap
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// 将xml转为bitmappublic 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;} |
==============参考资料===================
* 1.http://stackoverflow.com/questions/7200535/how-to-convert-views-to-bitmap
* 2.http://stackoverflow.com/questions/5536066/convert-view-to-bitmap-on-android/9595919#9595919
* 3.http://stackoverflow.com/questions/12402392/android-converting-xml-view-to-bitmap-without-showing-it
4.图片缩放与压缩
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// 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} |
5.图片转为文件
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// 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);} |
6.屏幕截屏方法
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// 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());} |
7.把Bitmap 转成 Byte
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// 把Bitmap 转成 Bytepublic static byte[] Bitmap2Bytes(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray();} |
8.图片转为文件
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// 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);} |
9.下载图片
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// 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;} |
10.byte[]转换成Bitmap
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// byte[]转换成Bitmappublic static Bitmap Bytes2Bitmap(byte[] b){ if (b.length != 0) { return BitmapFactory.decodeByteArray(b, 0, b.length); } return null;} |
11.将字符串转换成Bitmap类型
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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;} |
12.将Bitmap转换成字符串
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public static String bitmaptoString(Bitmap bitmap){ // 将Bitmap转换成字符串 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;} |
13.byte[]转为文件
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//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;} |
14.图片压缩
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//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;} |
15.将byte[]转换成InputStream
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// 将byte[]转换成InputStreampublic InputStream Byte2InputStream(byte[] b){ ByteArrayInputStream bais = new ByteArrayInputStream(b); return bais;} |
16.将InputStream转换成byte[]
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// 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;} |
17.将Bitmap转换成InputStream
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// 将Bitmap转换成InputStreampublic InputStream Bitmap2InputStream(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); InputStream is = new ByteArrayInputStream(baos.toByteArray()); return is;} |
18.将Bitmap转换成InputStream
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// 将Bitmap转换成InputStreampublic 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;} |
19.将InputStream转换成Bitmap
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// 将InputStream转换成Bitmappublic Bitmap InputStream2Bitmap(InputStream is){ return BitmapFactory.decodeStream(is);} |
20.Drawable转换成InputStream
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// Drawable转换成InputStreampublic InputStream Drawable2InputStream(Drawable d){ Bitmap bitmap = this.drawable2Bitmap(d); return this.Bitmap2InputStream(bitmap);} |
21.InputStream转换成Drawable
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// InputStream转换成Drawablepublic Drawable InputStream2Drawable(InputStream is){ Bitmap bitmap = this.InputStream2Bitmap(is); return this.bitmap2Drawable(bitmap);} |
22.Drawable转换成byte[]
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// Drawable转换成byte[]public byte[] Drawable2Bytes(Drawable d){ Bitmap bitmap = this.drawable2Bitmap(d); return this.Bitmap2Bytes(bitmap);} |
23.byte[]转换成Drawable
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// byte[]转换成Drawablepublic Drawable Bytes2Drawable(byte[] b){ Bitmap bitmap = this.Bytes2Bitmap(b); return this.bitmap2Drawable(bitmap);} |
24.Drawable转换成Bitmap
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// Drawable转换成Bitmappublic 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;} |
25.Bitmap转换成Drawable
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// Bitmap转换成Drawablepublic Drawable bitmap2Drawable(Bitmap bitmap){ BitmapDrawable bd = new BitmapDrawable(bitmap); Drawable d = (Drawable) bd; return d;}
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