android 图片工具类 (图片压缩 图片长按缓存 Bitmap转Base64 Bitmap转File File转Bitmap 打开系统相册解析URI)

总结了一下自己平时跟图片打交道的常用代码 尤其是压缩这块,整理了一下质量压缩方法 代码里有详尽的注释 复制之后可以直接拿去用...

public class ImageUtil {    /**     * 获取缓存文件夹的相对路径     */    public static String getDiskCacheDir(Context ctx) {        String cachePath;        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())                || !Environment.isExternalStorageRemovable()) {            cachePath = ctx.getExternalCacheDir().getPath();        } else {            cachePath = ctx.getCacheDir().getPath();        }        return cachePath;    }    /*     * bitmap转file(原图转换)     */    public static String bitmapToFile(Context context,Bitmap bitmap) {        String sdPath = getDiskCacheDir(context);        String name = new DateFormat().format("yyyyMMddhhmmss",                Calendar.getInstance(Locale.CHINA)) + ".jpg";        String picPath = sdPath + "/" + name;        File outImage = new File(picPath);        OutputStream outputStream = null;        try {            outputStream = new FileOutputStream(outImage);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);        //返回一个图片路径        return picPath;    }    /*     * bitmap转file(带压缩转换 可以自己设定 默认100kb) 上传服务器的时候使用     */    public static String bitmapToFileWhithCompress(Context context , Bitmap bitmap ,int kb) {        String sdPath = getDiskCacheDir(context);        String name = new DateFormat().format("yyyyMMddhhmmss",                Calendar.getInstance(Locale.CHINA)) + ".jpg";        String picPath = sdPath + "/" + name;        File outImage = new File(picPath);        OutputStream outputStream = null;        try {            outputStream = new FileOutputStream(outImage);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        //调用了下面封装好的压缩方法返回已经压缩的bitmap 然后再调用cmpress 输出流把bitmap转走 100不再压缩 因为已经压缩好了        compressImage(bitmap,kb).compress(Bitmap.CompressFormat.JPEG, 100, outputStream);        //返回一个压缩图片绝对路径        return picPath;    }    /**     * file转bitmap(进行压缩,放置内存泄漏)     */    public static Bitmap fileToBitmap(String imagePath,int kb) {        Bitmap bitmap = null;        try {            File file = new File(imagePath);            BitmapFactory.Options options = new BitmapFactory.Options();            options.inJustDecodeBounds = false;            FileInputStream fis = new FileInputStream(file);            bitmap = BitmapFactory.decodeStream(fis, null, options);            //将bitmap进行压缩防止内存泄漏            bitmap = compressImage(bitmap,kb);            fis.close();        } catch (IOException e) {            e.printStackTrace();        }        return bitmap;    }    //无回调有返回值的压缩方法    public static Bitmap compressImage(Bitmap image , int kb) {        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 > kb) { //循环判断如果压缩后图片是否大于设定的kb,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;    }    //有回调有返回值的压缩方法    public static Bitmap compressBitmap(Bitmap image,int kb, CompressCallback callback) {        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 > kb) { //循环判断如果压缩后图片是否大于设定的kb,大于继续压缩            baos.reset();//重置baos即清空baos                        if (options <= 0){                break;            }            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        callback.finish(bitmap);        return bitmap;    }    //获取View上的Bitmap    public static Bitmap getViewBitmap(View view) {                if (view == null) {            return null;        }                Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(bitmap);        view.draw(canvas);        if (bitmap == null){            return null;        }        return bitmap;    }    /*     * 通过文件路径转Base64     */    public static String fileToBase64(String path) {        // decode to bitmap        Bitmap bitmap = BitmapFactory.decodeFile(path);        // convert to byte array        ByteArrayOutputStream baos = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);        byte[] bytes = baos.toByteArray();        // base64 encode        byte[] encode = Base64.encode(bytes, Base64.DEFAULT);        String encodeString = new String(encode);        return encodeString;    }    /*     * 通过bitmap转Base64     */    public static String bitmapToBase64(Bitmap bitmap) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);        byte[] bytes = baos.toByteArray();        // base64 encode        byte[] encode = Base64.encode(bytes, Base64.DEFAULT);        String encodeString = new String(encode);        return encodeString;    }    /**     *base64转成bitmap     */    public static Bitmap base64ToBitmap (String base64) {        byte[] decode = Base64.decode(base64, Base64.DEFAULT);        Bitmap bitmap = BitmapFactory.decodeByteArray(decode, 0, decode.length);        return bitmap;    }    /**     * 清理缓存文件夹     */    public static void clearCache(Context ctx,String cachePath) {        File file = new File(cachePath);        File[] childFile = file.listFiles();        if (childFile == null || childFile.length == 0) {            return;        }        for (File f : childFile) {            f.delete(); // 循环删除子文件        }    }    //回调接口    public interface CompressCallback {        void finish(Bitmap bitmap);    }    //获取文件名    public static String getFileName(String pathandname) {        int start = pathandname.lastIndexOf("/");        int end = pathandname.lastIndexOf(".");        if (start != -1 && end != -1) {            return pathandname.substring(start + 1, end);        } else {            return null;        }    }    /*****************相册URI解析判断4.4系统****************/    @TargetApi(Build.VERSION_CODES.KITKAT)    public static String getPath(final Context context, final Uri uri) {        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;        // DocumentProvider        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {            if (isExternalStorageDocument(uri)) {                final String docId = DocumentsContract.getDocumentId(uri);                final String[] split = docId.split(":");                final String type = split[0];                if ("primary".equalsIgnoreCase(type)) {                    return Environment.getExternalStorageDirectory() + "/"                            + split[1];                }            }            // DownloadsProvider            else if (isDownloadsDocument(uri)) {                final String id = DocumentsContract.getDocumentId(uri);                final Uri contentUri = ContentUris.withAppendedId(                        Uri.parse("content://downloads/public_downloads"),                        Long.valueOf(id));                return getDataColumn(context, contentUri, null, null);            }            // MediaProvider            else if (isMediaDocument(uri)) {                final String docId = DocumentsContract.getDocumentId(uri);                final String[] split = docId.split(":");                final String type = split[0];                Uri contentUri = null;                if ("image".equals(type)) {                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;                } else if ("video".equals(type)) {                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;                } else if ("audio".equals(type)) {                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;                }                final String selection = "_id=?";                final String[] selectionArgs = new String[]{split[1]};                return getDataColumn(context, contentUri, selection,                        selectionArgs);            }        }        // MediaStore (and general)        else if ("content".equalsIgnoreCase(uri.getScheme())) {            // Return the remote address            if (isGooglePhotosUri(uri))                return uri.getLastPathSegment();            return getDataColumn(context, uri, null, null);        }        // File        else if ("file".equalsIgnoreCase(uri.getScheme())) {            return uri.getPath();        }        return null;    }    /**     * Get the value of the data column for this Uri. This is useful for     * MediaStore Uris, and other file-based ContentProviders.     *     * @param context       The context.     * @param uri           The Uri to query.     * @param selection     (Optional) Filter used in the query.     * @param selectionArgs (Optional) Selection arguments used in the query.     * @return The value of the _data column, which is typically a file path.     */    public static String getDataColumn(Context context, Uri uri,                                       String selection, String[] selectionArgs) {        Cursor cursor = null;        final String column = "_data";        final String[] projection = {column};        try {            cursor = context.getContentResolver().query(uri, projection,                    selection, selectionArgs, null);            if (cursor != null && cursor.moveToFirst()) {                final int index = cursor.getColumnIndexOrThrow(column);                return cursor.getString(index);            }        } finally {            if (cursor != null)                cursor.close();        }        return null;    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is ExternalStorageProvider.     */    public static boolean isExternalStorageDocument(Uri uri) {        return "com.android.externalstorage.documents".equals(uri                .getAuthority());    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is DownloadsProvider.     */    public static boolean isDownloadsDocument(Uri uri) {        return "com.android.providers.downloads.documents".equals(uri                .getAuthority());    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is MediaProvider.     */    public static boolean isMediaDocument(Uri uri) {        return "com.android.providers.media.documents".equals(uri                .getAuthority());    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is Google Photos.     */    public static boolean isGooglePhotosUri(Uri uri) {        return "com.google.android.apps.photos.content".equals(uri                .getAuthority());    }}