[Phonegap+Sencha Touch] 移动开发29 安卓navigator.camera.getPicture得到图片的真实路径

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.camera\src\android\CameraLauncher.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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