android4.4版本uri转换怎么调用

/

根据Uri获取绝对路径，解决Android44以上版本Uri转换

@param activity

@param imageUri

@author yaoxing

@date 2014-10-12

/

@TargetApi(19)

public static String getImageAbsolutePath(Activity context, Uri imageUri) {

if (context == null || imageUri == null)

return null;

if (androidosBuildVERSIONSDK_INT >= androidosBuildVERSION_CODESKITKAT && DocumentsContractisDocumentUri(context, imageUri)) {

if (isExternalStorageDocument(imageUri)) {

String docId = DocumentsContractgetDocumentId(imageUri);

String[] split = docIdsplit(":");

String type = split[0];

if ("primary"equalsIgnoreCase(type)) {

return EnvironmentgetExternalStorageDirectory() + "/" + split[1];

}

} else if (isDownloadsDocument(imageUri)) {

String id = DocumentsContractgetDocumentId(imageUri);

Uri contentUri = ContentUriswithAppendedId(Uriparse("content://downloads/public_downloads"), LongvalueOf(id));

return getDataColumn(context, contentUri, null, null);

} else if (isMediaDocument(imageUri)) {

String docId = DocumentsContractgetDocumentId(imageUri);

String[] split = docIdsplit(":");

String type = split[0];

Uri contentUri = null;

if ("image"equals(type)) {

contentUri = MediaStoreImagesMediaEXTERNAL_CONTENT_URI;

} else if ("video"equals(type)) {

contentUri = MediaStoreVideoMediaEXTERNAL_CONTENT_URI;

} else if ("audio"equals(type)) {

contentUri = MediaStoreAudioMediaEXTERNAL_CONTENT_URI;

}

String selection = MediaStoreImagesMedia_ID + "=";

String[] selectionArgs = new String[] { split[1] };

return getDataColumn(context, contentUri, selection, selectionArgs);

}

} // MediaStore (and general)

else if ("content"equalsIgnoreCase(imageUrigetScheme())) {

// Return the remote address

if (isGooglePhotosUri(imageUri))

return imageUrigetLastPathSegment();

return getDataColumn(context, imageUri, null, null);

}

// File

else if ("file"equalsIgnoreCase(imageUrigetScheme())) {

return imageUrigetPath();

}

return null;

}

public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {

Cursor cursor = null;

String column = MediaStoreImagesMediaDATA;

String[] projection = { column };

try {

cursor = contextgetContentResolver()query(uri, projection, selection, selectionArgs, null);

if (cursor != null && cursormoveToFirst()) {

int index = cursorgetColumnIndexOrThrow(column);

return cursorgetString(index);

}

} finally {

if (cursor != null)

cursorclose();

}

return null;

}

/

@param uri The Uri to check

@return Whether the Uri authority is ExternalStorageProvider

/

public static boolean isExternalStorageDocument(Uri uri) {

return "comandroidexternalstoragedocuments"equals(urigetAuthority());

}

/

@param uri The Uri to check

@return Whether the Uri authority is DownloadsProvider

/

public static boolean isDownloadsDocument(Uri uri) {

return "comandroidprovidersdownloadsdocuments"equals(urigetAuthority());

}

/

@param uri The Uri to check

@return Whether the Uri authority is MediaProvider

/

public static boolean isMediaDocument(Uri uri) {

return "comandroidprovidersmediadocuments"equals(urigetAuthority());

}

/

@param uri The Uri to check

@return Whether the Uri authority is Google Photos

/

public static boolean isGooglePhotosUri(Uri uri) {

return "comgoogleandroidappsphotoscontent"equals(urigetAuthority());

}

使用照相机的方法：

//在监听事件中加入如下代码

Intent intent = new Intent(MediaStoreACTION_IMAGE_CAPTURE);

intentputExtra(MediaStoreEXTRA_OUTPUT, UrifromFile(new File(EnvironmentgetExternalStorageDirectory()+"/","tempjpg")));

startActivityForResult(intent, reqCode_CAMERA);// reqCode_CAMERA是一个一自己设定的值，用于在onActivityResult方法中判断是哪一个activity返回的

再重写onActivityResult方法：

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

superonActivityResult(requestCode, resultCode, data);

if(requestCode == reqCode_CAMERA && resultCode== RESULT_OK){

////这里是直接隐式启动系统预览程序

// Intent intent = new Intent();

// intentsetAction(IntentACTION_VIEW);

//// uri指向用户选择的那个

// Uri uri = datagetData();

// intentsetData(uril);

// startActivity(intent);

// Uri uri = datagetData();

// Cursor cursor = getContentResolver()query(uri, null, null, null, null);

// if(cursor!=null&&cursormoveToFirst()){

// String path = cursorgetString(1);

// Bitmap bm = BitmapFactorydecodeFile(path);

// ivsetImageBitmap(bm);

// }

// ivsetImageURI(uri);

//也可以用这里代码打开裁剪

Intent intent = new Intent();

intentsetAction("comandroidcameraactionCROP");

intentsetType("image/");

intentputExtra("data", datagetExtras()getParcelable("data"));

intentputExtra("crop", "true");

intentputExtra("aspectX", 1);//默认剪裁起始位置x值

intentputExtra("aspectY", 1);//默认剪裁起始位置y值

intentputExtra("outputX", 128);//默认剪裁终止位置x值

intentputExtra("outputY", 128);//默认剪裁终止位置x值

intentputExtra("return-data", true);

startActivityForResult(intent, reqCode_Zoom);

}//这里是处理剪裁返回后的处理，直接调用ImageView显示了，你可以根据你的需要修改

else if(requestCode==reqCode_Zoom){

Bitmap bitmap = datagetExtras()getParcelable("data");

ivsetImageBitmap(bitmap);

}

上传本地方法：

按钮名setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// 隐式启动系统相册程序

Intent intent = new Intent();

intentsetAction(IntentACTION_PICK);

intentsetDataAndType(MediaEXTERNAL_CONTENT_URI, "image/");

startActivityForResult(intent, reqCode_PICK);// reqCode和上面一样自己定义，但是不要重复了

}

});

再在onActivityResult方法添加一个"elseif(requestCode == reqCode_PICK && resultCode== RESULT_OK)"条件，方法体直接参考上面，就是在剪裁那里把“intentputExtra("data", datagetExtras()getParcelable("data"));”换为“intentsetDataAndType(datagetData(), "image/");”就可以了。

android下使用cursor获取专辑，主要是在数据库里面先保存专辑的url地址，当使用cursor游标遍历数据库数据的时候，使用资源 *** 作类进行加载相应的url，如下代码：

Cursor cursor = contextgetContentResolver()query(MediaEXTERNAL_CONTENT_URI, columns, null, null, null);

Loge("cursor" , (cursor==null) + "");

while(cursormoveToNext()) {

// 查找封面

long albumId = cursorgetLong(5);

// 读取专辑

String album_uri = "content://media/external/audio/albumart"; // 专辑Uri对应的字符串

Uri albumUri = ContentUriswithAppendedId(Uriparse(album_uri), albumId);

// 取 ==> 得到一个输入流

Bitmap coverPhoto = null ;

try {

InputStream is = contextgetContentResolver()openInputStream(albumUri);

if(null != is) {

coverPhoto = BitmapFactorydecodeStream(is);

}

} catch (Exception e) {

eprintStackTrace();

}

dataadd(new Audio(cursorgetLong(0), cursorgetString(1) , cursorgetString(2) , cursorgetLong(3) , cursorgetString(4) , albumId , coverPhoto));

}

cursorclose();

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