原文地址：http://blog.csdn.net/lovelyelfpop/article/details/38313021
phonegap的拍照插件选择图库中的图片。代码例如以下：
navigator.camera.getPicture(function(uri){
console.log(uri);//这里得到图片的uri
}, function(err){ console.log(err); }, {
quality: 70,
destinationType: navigator.camera.DestinationType.FILE_URI,
sourceType: navigator.camera.PictureSourceType.PHOTOLIBRARY,
saveToPhotoAlbum: true
});
返回的图片路径是这种：
安卓4.4之前：content://media/external/images/media/62
安卓4.4：content://com.android.providers.media.documents/document/image:62
这种路径叫做Content URI，并非图片的真实路径，真实路径应该是这种：file:///storage/emulated/0/DCIM/Camera/1406773746740.jpg。
解决的方法：
1、打开插件文件org.apache.cordova.camerasrcandroidCameraLauncher.java
在里面加入以下的代码：
/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @author paulburke
*/
@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];
}
// 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());
}
2、然后找到以下的代码（processResultFromGallery方法）：
if (this.targetHeight == -1 && this.targetWidth == -1 &&
(destType == FILE_URI || destType == NATIVE_URI) && !this.correctOrientation) {
this.callbackContext.success(uri.toString());
}改动成这样
if (this.targetHeight == -1 && this.targetWidth == -1 &&
(destType == FILE_URI || destType == NATIVE_URI) && !this.correctOrientation) {
Context context = this.webView.getContext().getApplicationContext();
this.callbackContext.success(getPath(context, uri));
}
3、找到以下代码（processResultFromGallery方法）：
else if (destType == FILE_URI || destType == NATIVE_URI) {
// Did we modify the image?
if ( (this.targetHeight > 0 && this.targetWidth > 0) ||
(this.correctOrientation && this.orientationCorrected) ) {
try {
String modifiedPath = this.ouputModifiedBitmap(bitmap, uri);
// The modified image is cached by the app in order to get around this and not have to delete you
// application cache I'm adding the current system time to the end of the file url.
this.callbackContext.success("file://" + modifiedPath + "?
" + System.currentTimeMillis());
} catch (Exception e) {
e.printStackTrace();
this.failPicture("Error retrieving image.");
}
}
else {
this.callbackContext.success(uri.toString());
}
}
改动成这样（else部分）
else if (destType == FILE_URI || destType == NATIVE_URI) {
// Did we modify the image?
if ( (this.targetHeight > 0 && this.targetWidth > 0) ||
(this.correctOrientation && this.orientationCorrected) ) {
try {
String modifiedPath = this.ouputModifiedBitmap(bitmap, uri);
// The modified image is cached by the app in order to get around this and not have to delete you
// application cache I'm adding the current system time to the end of the file url.
this.callbackContext.success("file://" + modifiedPath + "?" + System.currentTimeMillis());
} catch (Exception e) {
e.printStackTrace();
this.failPicture("Error retrieving image.");
}
}
else {
Context context = this.webView.getContext().getApplicationContext(); //这里
this.callbackContext.success(getPath(context, uri));
}
}
4、记得在顶部导入包：
import android.annotation.SuppressLint; import android.content.ContentUris; import android.content.Context; import android.os.Build; import android.provider.DocumentsContract;
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