Android獲取相冊中圖片的路徑 4.4版本前后的變化

兩個問題:

1. 通過調用系統Action，從圖庫中選擇圖片，并展示到界面上

2. API19前后獲取相冊圖片路徑

詳見(僅客戶端代碼),請移步：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);

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@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)); /* 將Bitmap設定到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這個常量的值是19 path = uri.getPath();//5.0直接返回的是圖片路徑 Uri.getPath is ： /document/image:46 ，5.0以下是一個和數據庫有關的索引值 System.out.println("path:" + path); // path_above19:/storage/emulated/0/girl.jpg 這里才是獲取的圖片的真實路徑 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); }

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/** * API19以下獲取圖片路徑的方法 * @param uri */ private String getFilePath_below19(Uri uri) { //這里開始的第二部分，獲取圖片的路徑：低版本的是沒問題的，但是sdk>19會獲取不到 String[] proj = {MediaStore.Images.Media.DATA}; //好像是android多媒體數據庫的封裝接口，具體的看Android文檔 Cursor cursor = getContentResolver().query(uri, proj, null, null, null); //獲得用戶選擇的圖片的索引值 int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); System.out.println("***************" + column_index); //將光標移至開頭 ，這個很重要，不小心很容易引起越界 cursor.moveToFirst(); //最后根據索引值獲取圖片路徑 結果類似：/mnt/sdcard/DCIM/Camera/IMG_20151124_013332.jpg String path = cursor.getString(column_index); System.out.println("path:" + path); return path; }

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/** * APIlevel 19以上才有 * 創建項目時，我們設置了最低版本API Level，比如我的是10， * 因此，AS檢查我調用的API后，發現版本號不能向低版本兼容， * 比如我用的“DocumentsContract.isDocumentUri(context, uri)”是Level 19 以上才有的， * 自然超過了10，所以提示錯誤。 * 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()); }

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Android

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