android4.4从系统图库无法加载图片的问题

典型的使用场景就是要设置一个头像，头像需要从系统图库或者拍照获得，在android4.4之前，我用的代码没问题，但是今天使用android4.4的时候突然发现不灵了。baidu了一圈，终于解决了。
下面是解决方案：

private String[] items = new String[] { "图库","拍照" };
		/* 头像名称 */
		private static final String IMAGE_FILE_NAME = "face.jpg";
		/* 请求码 */
		private static final int IMAGE_REQUEST_CODE = 0;
		private static final int SELECT_PIC_KITKAT = 3;
		private static final int CAMERA_REQUEST_CODE = 1;
		private static final int RESULT_REQUEST_CODE = 2;

		private void showSettingFaceDialog() {

			new AlertDialog.Builder(this)
					.setTitle("图片来源")
					.setCancelable(true)
					.setItems(items, new DialogInterface.OnClickListener() {

						@Override
						public void onClick(DialogInterface dialog, int which) {
							switch (which) {
							case 0:// Local Image
 								Intent intent=new Intent(Intent.ACTION_GET_CONTENT);
 								intent.addCategory(Intent.CATEGORY_OPENABLE);
 								intent.setType("image/*");
								if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
									startActivityForResult(intent,SELECT_PIC_KITKAT);
								} else {
									startActivityForResult(intent,IMAGE_REQUEST_CODE);
								}
								break;
							case 1:// Take Picture
								Intent intentFromCapture = new Intent(
										MediaStore.ACTION_IMAGE_CAPTURE);
								// 判断存储卡是否可以用，可用进行存储
								if (hasSdcard()) {
									intentFromCapture.putExtra(
											MediaStore.EXTRA_OUTPUT,
											Uri.fromFile(new File(Environment
													.getExternalStorageDirectory(),
													IMAGE_FILE_NAME)));
								}
								startActivityForResult(intentFromCapture,
										CAMERA_REQUEST_CODE);
								break;
							}
						}
					})
					.setNegativeButton("取消",
							new DialogInterface.OnClickListener() {

								@Override
								public void onClick(DialogInterface dialog,
										int which) {
									dialog.dismiss();
								}
							}).show();

		}

		@Override
		protected void onActivityResult(int requestCode, int resultCode, Intent data) {
			// 结果码不等于取消时候
			if (resultCode != RESULT_CANCELED) {
				switch (requestCode) {
				case IMAGE_REQUEST_CODE:
					startPhotoZoom(data.getData());
					break;
				case SELECT_PIC_KITKAT:
					startPhotoZoom(data.getData());
					break;
				case CAMERA_REQUEST_CODE:
					if (hasSdcard()) {
						File tempFile = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);
						startPhotoZoom(Uri.fromFile(tempFile));
					} else {
						ToastUtils.showShort(context,"未找到存储卡，无法存储照片！");
					}

					break;
				case RESULT_REQUEST_CODE:
					if (data != null) {
						setImageToView(data,iv_face);
					}
					break;
				}
			}
			super.onActivityResult(requestCode, resultCode, data);
		}

		/**
		 * 裁剪图片方法实现
		 * 
		 * @param uri
		 */
		public void startPhotoZoom(Uri uri) {
			if (uri == null) {
				Log.i("tag", "The uri is not exist.");
				return;
			}
			
			Intent intent = new Intent("com.android.camera.action.CROP");
			if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
				String url=getPath(context,uri);
				intent.setDataAndType(Uri.fromFile(new File(url)), "image/*");
			}else{
				intent.setDataAndType(uri, "image/*");
			}
			
			// 设置裁剪
			intent.putExtra("crop", "true");
			// aspectX aspectY 是宽高的比例
			intent.putExtra("aspectX", 1);
			intent.putExtra("aspectY", 1);
			// outputX outputY 是裁剪图片宽高
			intent.putExtra("outputX", 200);
			intent.putExtra("outputY", 200);
			intent.putExtra("return-data", true);
			startActivityForResult(intent, RESULT_REQUEST_CODE);
		}
		
		/**
		 * 保存裁剪之后的图片数据
		 * 
		 * @param picdata
		 */
		private void setImageToView(Intent data,ImageView imageView) {
			Bundle extras = data.getExtras();
			if (extras != null) {
				Bitmap photo = extras.getParcelable("data");
				Bitmap roundBitmap=ImageUtil.toRoundBitmap(photo);
				imageView.setImageBitmap(roundBitmap);
				saveBitmap(photo);
			}
		}

		public void saveBitmap(Bitmap mBitmap) {
			File f = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);
			try {
				f.createNewFile();
				FileOutputStream fOut = null;
				fOut = new FileOutputStream(f);
				mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
				fOut.flush();
				fOut.close();
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		
		
		//以下是关键，原本uri返回的是file:///...来着的，android4.4返回的是content:///...
		@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 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());
		}

最后只需要在需要的地方调用showSettingFaceDialog()就可以了。

如果要获得剪裁的图片保存路径，然后上传，我这边是这样处理的（这里每个人的写法不一样）：
但只要获得filePath就可以根据自己的需求处理了

private void uploadFace(){
    	File file = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);
		String filePath=file.getAbsolutePath();
		
		Log.i("tag", "filePath="+filePath);
		HttpHelper.uploadFileWithConcatUrl(context,HttpHelper.UPDATE_USER_ICON,App.user.getUser_session_key() ,filePath ,new HttpHelper.OnFileUploadListener(){

				@Override
				public void onFileUploadSuccess(String orignUrl, String midImgUrl,
						String smallImgUrl) {
					// TODO Auto-generated method stub
					
					App.user.setHead_icon(orignUrl);
					
					saveUser();
				}
				 
		});
    }

评论

3 楼 qq_20092877 2016-10-09  

     谢谢 很好的解决了我的问题

2 楼 lihansey 2015-09-25  

weiran2222 写道

你好,我这个方法不能用啊,怎么办?DocumentsContract.getDocumentId(uri)

DocumentsContract  add in android 4.4 and better

1 楼 weiran2222 2015-01-22  

你好,我这个方法不能用啊,怎么办?DocumentsContract.getDocumentId(uri)