工具类！用来解决MIUI下无法获取系统相册的办法

MIUI果然名不虚传，各种迷之报错。上传图片的时候发现图片的路径返回值与其他的手机不一样，所以封装了下面的工具来解决MIUI下无法获取到系统相册中的图片的问题。

• 工具类：

/**
 * 小米、红米手机系列获取相册图片
 * Cursor.moveToFirst()' on a null object reference
 * 工具处理类,处理小米手机各种ContentProvider空指针
 */
public class MIUIPictureUtils {

    @SuppressLint("NewApi")
    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)) {
            // ExternalStorageProvider
            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;

    }

    private 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;

    }

    private static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    private static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }
}

用法：

在onActivityResult中使用：

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        String picPath = "";
        if (BaseUtils.isMIUI()) {//如果是MIUI系统，单独调用获取图片地址的方法
            Uri uri = data.getData();
            picPath = MIUIPictureUtils.getPath(XXXXXX.this, uri);
        } else {
            picPath = mCreateBmpFactory.getBitmapFilePath(requestCode, resultCode, data);
        }

        Bitmap bmp = mCreateBmpFactory.getBitmapByOpt(picPath);
       ...
    }

判断是否是MIUI的方法：

 public static boolean isMIUI() {
        try {
            final BuildProperties prop = BuildProperties.newInstance();
            return prop.getProperty(KEY_MIUI_VERSION_CODE, null) != null
                    || prop.getProperty(KEY_MIUI_VERSION_NAME, null) != null
                    || prop.getProperty(KEY_MIUI_INTERNAL_STORAGE, null) != null;
        } catch (final IOException e) {
            return false;
        }
    }

上面的BuildProperties类：

public class BuildProperties {

    private final Properties properties;

    private BuildProperties() throws IOException {
        properties = new Properties();
        properties.load(new FileInputStream(new File(Environment.getRootDirectory(), "build.prop")));
    }

    public boolean containsKey(final Object key) {
        return properties.containsKey(key);
    }

    public boolean containsValue(final Object value) {
        return properties.containsValue(value);
    }

    public Set> entrySet() {
        return properties.entrySet();
    }

    public String getProperty(final String name) {
        return properties.getProperty(name);
    }

    public String getProperty(final String name, final String defaultValue) {
        return properties.getProperty(name, defaultValue);
    }

    public boolean isEmpty() {
        return properties.isEmpty();
    }

    public Enumeration