两个问题:
1. 通过调用系统Action，从图库中选择图片，并展示到界面上
2. API19前后获取相册图片路径
详见(仅客户端代码),请移步：本人GITHUB
Intent intent = new Intent(); // Set an explicit MIME data type. intent.setType("image/*"); // Set the general action to be performed. intent.setAction(Intent.ACTION_GET_CONTENT); // callBack startActivityForResult(intent,1);
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { Uri uri = data.getData(); ContentResolver cr =this.getContentResolver(); try { Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri)); /* 将Bitmap设定到ImageView */ iv_local_pic.setImageBitmap(bitmap); int sdkVersion = Integer.valueOf(android.os.Build.VERSION.SDK); Log.d("sdkVersion:", String.valueOf(sdkVersion)); Log.d("KITKAT:", String.valueOf(Build.VERSION_CODES.KITKAT)); if (sdkVersion >= 19) { // 或者 android.os.Build.VERSION_CODES.KITKAT这个常量的值是19 path = uri.getPath();//5.0直接返回的是图片路径 Uri.getPath is ： /document/image:46 ，5.0以下是一个和数据库有关的索引值 System.out.println("path:" + path); // path_above19:/storage/emulated/0/girl.jpg 这里才是获取的图片的真实路径 path = getPath_above19(Upload_HttpUrlConnection_Activity.this, uri); System.out.println("path_above19:" + path); } else { path = getFilePath_below19(uri); } } catch (FileNotFoundException e) { Log.e("Exception", e.getMessage(), e); } } super.onActivityResult(requestCode, resultCode, data); }
/** * API19以下获取图片路径的方法 * @param uri */ private String getFilePath_below19(Uri uri) { //这里开始的第二部分，获取图片的路径：低版本的是没问题的，但是sdk>19会获取不到 String[] proj = {MediaStore.Images.Media.DATA}; //好像是android多媒体数据库的封装接口，具体的看Android文档 Cursor cursor = getContentResolver().query(uri, proj, null, null, null); //获得用户选择的图片的索引值 int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); System.out.println("***************" + column_index); //将光标移至开头 ，这个很重要，不小心很容易引起越界 cursor.moveToFirst(); //最后根据索引值获取图片路径 结果类似：/mnt/sdcard/DCIM/Camera/IMG_20151124_013332.jpg String path = cursor.getString(column_index); System.out.println("path:" + path); return path; }
/** * APIlevel 19以上才有 * 创建项目时，我们设置了最低版本API Level，比如我的是10， * 因此，AS检查我调用的API后，发现版本号不能向低版本兼容， * 比如我用的“DocumentsContract.isDocumentUri(context, uri)”是Level 19 以上才有的， * 自然超过了10，所以提示错误。 * 添加 @TargetApi(Build.VERSION_CODES.KITKAT)即可。 * * @param context * @param uri * @return */ @TargetApi(Build.VERSION_CODES.KITKAT) public static String getPath_above19(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]; } // TODO handle non-primary volumes } // 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()); }
