根据URI获取文件路径

这是个工具类直接使用就可以了

我这个是用在ZXing扫码时要读取本地图片的二维码内容时用到的。

public class getPathUtil {

    //简易处理板  （实际本没有发现什么问题，可以直接使用）
    public static String getRealPathFromURI(Context context, Uri contentURI) {
        String result;
        Cursor cursor = context.getContentResolver().query(contentURI,
                new String[]{MediaStore.Images.ImageColumns.DATA},//
                null, null, null);
        if (cursor == null) result = contentURI.getPath();
        else {
            cursor.moveToFirst();
            int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
            result = cursor.getString(index);
            cursor.close();
        }
        return result;
    }

    //复杂版处理  (适配多种API)   最后直接调用这个方法就可以了
    public static String getRealPathFromUri(Context context, Uri uri) {
        int sdkVersion = Build.VERSION.SDK_INT;
        if (sdkVersion < 11) return getRealPathFromUri_BelowApi11(context, uri);
        if (sdkVersion < 19) return getRealPathFromUri_Api11To18(context, uri);
        else return getRealPathFromUri_AboveApi19(context, uri);
    }

    /**
     * 适配api19以上,根据uri获取图片的绝对路径
     */
    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static String getRealPathFromUri_AboveApi19(Context context, Uri uri) {
        String filePath = null;
        String wholeID = DocumentsContract.getDocumentId(uri);

        // 使用':'分割
        String id = wholeID.split(":")[1];

        String[] projection = {MediaStore.Images.Media.DATA};
        String selection = MediaStore.Images.Media._ID + "=?";
        String[] selectionArgs = {id};

        Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,//
                projection, selection, selectionArgs, null);
        int columnIndex = cursor.getColumnIndex(projection[0]);
        if (cursor.moveToFirst()) filePath = cursor.getString(columnIndex);
        cursor.close();
        return filePath;
    }

    /**
     * 适配api11-api18,根据uri获取图片的绝对路径
     */
    private static String getRealPathFromUri_Api11To18(Context context, Uri uri) {
        String filePath = null;
        String[] projection = {MediaStore.Images.Media.DATA};
        //这个有两个包不知道是哪个。。。。不过这个复杂版一般用不到
        CursorLoader loader = new CursorLoader(context, uri, projection, null, null, null);
        Cursor cursor = loader.loadInBackground();

        if (cursor != null) {
            cursor.moveToFirst();
            filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
            cursor.close();
        }
        return filePath;
    }

    /**
     * 适配api11以下(不包括api11),根据uri获取图片的绝对路径
     */
    private static String getRealPathFromUri_BelowApi11(Context context, Uri uri) {
        String filePath = null;
        String[] projection = {MediaStore.Images.Media.DATA};
        Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();
            filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
            cursor.close();
        }
        return filePath;
    }


}

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OK  全部就在这里了   当作工具类用的