安卓跳转到系统相册选择图片并返回解析获取绝对路径

19之前直接跳转到：

intent.setAction(Intent.ACTION_GET_CONTENT);

intent.setType("image/*");

这个intent就可以，但是19之后如果再跳转到这个页面，然后又选择了不存在与MediaStore数据库中的图片，那么根据返回的uri进行解析就会发生错误。

所以需要适配一下，19之后跳转到这个intent:

intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");

c此页面只包含存在于MediaStore数据库中的图片，可有效防止找不到图片的错误。

 

代码如下：

/**跳转到系统相册：适配19前后的系统*/
public static Intent getGalleryIntent(Intent intent)
{
    /**19之后的系统相册的图片都存在于MediaStore数据库中；19之前的系统相册中可能包含不存在与数据库中的图片，所以如果是19之上的系统
     * 跳转到19之前的系统相册选择了一张不存在与数据库中的图片，解析uri时就可能会出现null*/
    if (Build.VERSION.SDK_INT < 19) {
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
    } else {
        intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");
    }
    return intent;
}

/**
 * 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使
 * 可以用在  解析 uri 数据的地方（相册回传数据）
 */
@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 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 column_index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(column_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());

}