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); @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19path = 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);} /*** 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.jpgString path = cursor.getString(column_index);System.out.println("path:" + path);return path;} /*** 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;// DocumentProviderif (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {// ExternalStorageProviderif (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}// DownloadsProviderelse 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);}// MediaProviderelse 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 addressif (isGooglePhotosUri(uri))return uri.getLastPathSegment();return getDataColumn(context, uri, null, null);}// Fileelse 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());}

總結

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