Android(安卓)4.4从图库选择图片,获取图片路径并裁剪

转至http://blog.csdn.net/tempersitu/article/details/20557383

最近在做一个从图库选择图片或拍照,然后裁剪的功能.本来是没问题的,一直在用

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Intentintent=newIntent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

的方式来做,是调用系统图库来做,但是发现如果有图片是同步到google相册的话,图库里面能看到一个auto backup的目录,点进去选图片的话是无法获取到图片的路径的.因为那些图片根本就不存在于手机上.然后看到无论是百度贴吧,Instagram,或者还有些会选取图片做修改的app,都是用一个很漂亮的图片选择器(4.4以上,4.3的还是用系统旧的图库).

而这个图片选择器可以屏蔽掉那个auto backup的目录.所以就开始打算用这个图片选择器来选图片了.
这个方法就是

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Intentintent=newIntent(Intent.ACTION_GET_CONTENT);//ACTION_OPEN_DOCUMENT
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/jpeg");
if(android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.KITKAT){
startActivityForResult(intent,SELECT_PIC_KITKAT);
}else{
startActivityForResult(intent,SELECT_PIC);
}

为什么要分开不同版本呢?其实在4.3或以下可以直接用ACTION_GET_CONTENT的,在4.4或以上,官方建议用ACTION_OPEN_DOCUMENT,但其实都不算太大区别,区别是他们返回的Uri,那个才叫大区别.这就是困扰了我一整天的问题所在了.

4.3或以下,选了图片之后,根据Uri来做处理,很多帖子都有了,我就不详细说了.主要是4.4,如果使用上面pick的原生方法来选图,返回的uri还是正常的,但如果用ACTION_GET_CONTENT的方法,返回的uri跟4.3是完全不一样的,4.3返回的是带文件路径的,而4.4返回的却是content://com.android.providers.media.documents/document/image:3951这样的,没有路径,只有图片编号的uri.这就导致接下来无法根据图片路径来裁剪的步骤了.

还好找了很多方法,包括加权限啊什么的,中间还试过用一些方法,自己的app没崩溃,倒是让系统图库崩溃了,引发了java.lang.SecurityException.

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Causedby:java.lang.SecurityException:PermissionDenial:openingprovidercom.android.providers.media.MediaDocumentsProviderfromProcessRecord{437b5d889494:com.google.android.gallery3d/u0a20}(pid=9494,uid=10020)requiresandroid.permission.MANAGE_DOCUMENTSorandroid.permission.MANAGE_DOCUMENTS

看来4.4的系统还是有些bug.重点来了,4.4得到的uri,需要以下方法来获取文件的路径

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publicstaticStringgetPath(finalContextcontext,finalUriuri){
finalbooleanisKitKat=Build.VERSION.SDK_INT>=Build.VERSION_CODES.KITKAT;
//DocumentProvider
if(isKitKat&&DocumentsContract.isDocumentUri(context,uri)){
//ExternalStorageProvider
if(isExternalStorageDocument(uri)){
finalStringdocId=DocumentsContract.getDocumentId(uri);
finalString[]split=docId.split(":");
finalStringtype=split[0];
if("primary".equalsIgnoreCase(type)){
returnEnvironment.getExternalStorageDirectory()+"/"+split[1];
}
//TODOhandlenon-primaryvolumes
}
//DownloadsProvider
elseif(isDownloadsDocument(uri)){
finalStringid=DocumentsContract.getDocumentId(uri);
finalUricontentUri=ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),Long.valueOf(id));
returngetDataColumn(context,contentUri,null,null);
}
//MediaProvider
elseif(isMediaDocument(uri)){
finalStringdocId=DocumentsContract.getDocumentId(uri);
finalString[]split=docId.split(":");
finalStringtype=split[0];
UricontentUri=null;
if("image".equals(type)){
contentUri=MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
}elseif("video".equals(type)){
contentUri=MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
}elseif("audio".equals(type)){
contentUri=MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
finalStringselection="_id=?";
finalString[]selectionArgs=newString[]{
split[1]
};
returngetDataColumn(context,contentUri,selection,selectionArgs);
}
}
//MediaStore(andgeneral)
elseif("content".equalsIgnoreCase(uri.getScheme())){
//Returntheremoteaddress
if(isGooglePhotosUri(uri))
returnuri.getLastPathSegment();
returngetDataColumn(context,uri,null,null);
}
//File
elseif("file".equalsIgnoreCase(uri.getScheme())){
returnuri.getPath();
}
returnnull;
}
/**
*GetthevalueofthedatacolumnforthisUri.Thisisusefulfor
*MediaStoreUris,andotherfile-basedContentProviders.
*
*@paramcontextThecontext.
*@paramuriTheUritoquery.
*@paramselection(Optional)Filterusedinthequery.
*@paramselectionArgs(Optional)Selectionargumentsusedinthequery.
*@returnThevalueofthe_datacolumn,whichistypicallyafilepath.
*/
publicstaticStringgetDataColumn(Contextcontext,Uriuri,Stringselection,
String[]selectionArgs){
Cursorcursor=null;
finalStringcolumn="_data";
finalString[]projection={
column
};
try{
cursor=context.getContentResolver().query(uri,projection,selection,selectionArgs,
null);
if(cursor!=null&&cursor.moveToFirst()){
finalintindex=cursor.getColumnIndexOrThrow(column);
returncursor.getString(index);
}
}finally{
if(cursor!=null)
cursor.close();
}
returnnull;
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisExternalStorageProvider.
*/
publicstaticbooleanisExternalStorageDocument(Uriuri){
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisDownloadsProvider.
*/
publicstaticbooleanisDownloadsDocument(Uriuri){
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisMediaProvider.
*/
publicstaticbooleanisMediaDocument(Uriuri){
return"com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisGooglePhotos.
*/
publicstaticbooleanisGooglePhotosUri(Uriuri){
return"com.google.android.apps.photos.content".equals(uri.getAuthority());
}

这样,就可以在4.4上用漂亮的图片选择器,选到我们想要的文件,又不会出问题了.

昨天发现了个bug,如果在4.4上面不用"图片"来选,用"图库"来选,就会无法读取到图片路径,所以只需要加个判断,如果是用旧方式来选,就用旧方式来读,就是如果
DocumentsContract.isDocumentUri(context, uri) 返回false的话,就用旧的方式

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publicstaticStringselectImage(Contextcontext,Intentdata){
UriselectedImage=data.getData();
//Log.e(TAG,selectedImage.toString());
if(selectedImage!=null){
StringuriStr=selectedImage.toString();
Stringpath=uriStr.substring(10,uriStr.length());
if(path.startsWith("com.sec.android.gallery3d")){
Log.e(TAG,"It'sautobackuppicpath:"+selectedImage.toString());
returnnull;
}
}
String[]filePathColumn={MediaStore.Images.Media.DATA};
Cursorcursor=context.getContentResolver().query(selectedImage,filePathColumn,null,null,null);
cursor.moveToFirst();
intcolumnIndex=cursor.getColumnIndex(filePathColumn[0]);
StringpicturePath=cursor.getString(columnIndex);
cursor.close();
returnpicturePath;
}

这样就OK的了

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