根据URI获取文件路径

这是个工具类直接使用就可以了
我这个是用在ZXing扫码时要读取本地图片的二维码内容时用到的。public class getPathUtil {

//简易处理板 （实际本没有发现什么问题，可以直接使用）
public static String getRealPathFromURI(Context context, Uri contentURI) {
String result;
Cursor cursor = context.getContentResolver().query(contentURI,
new String[]{MediaStore.Images.ImageColumns.DATA},//
null, null, null);
if (cursor == null) result = contentURI.getPath();
else {
cursor.moveToFirst();
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
result = cursor.getString(index);
cursor.close();
}
return result;
}

//复杂版处理 (适配多种API) 最后直接调用这个方法就可以了
public static String getRealPathFromUri(Context context, Uri uri) {
int sdkVersion = Build.VERSION.SDK_INT;
if (sdkVersion < 11) return getRealPathFromUri_BelowApi11(context, uri);
if (sdkVersion < 19) return getRealPathFromUri_Api11To18(context, uri);
else return getRealPathFromUri_AboveApi19(context, uri);
}

/**
* 适配api19以上,根据uri获取图片的绝对路径
*/
@TargetApi(Build.VERSION_CODES.KITKAT)
private static String getRealPathFromUri_AboveApi19(Context context, Uri uri) {
String filePath = null;
String wholeID = DocumentsContract.getDocumentId(uri);

// 使用':'分割
String id = wholeID.split(":")[1];

String[] projection = {MediaStore.Images.Media.DATA};
String selection = MediaStore.Images.Media._ID + "=?";
String[] selectionArgs = {id};

Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,//
projection, selection, selectionArgs, null);
int columnIndex = cursor.getColumnIndex(projection[0]);
if (cursor.moveToFirst()) filePath = cursor.getString(columnIndex);
cursor.close();
return filePath;
}

/**
* 适配api11-api18,根据uri获取图片的绝对路径
*/
private static String getRealPathFromUri_Api11To18(Context context, Uri uri) {
String filePath = null;
String[] projection = {MediaStore.Images.Media.DATA};
//这个有两个包不知道是哪个。。。。不过这个复杂版一般用不到
CursorLoader loader = new CursorLoader(context, uri, projection, null, null, null);
Cursor cursor = loader.loadInBackground();

if (cursor != null) {
cursor.moveToFirst();
filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
cursor.close();
}
return filePath;
}

/**
* 适配api11以下(不包括api11),根据uri获取图片的绝对路径
*/
private static String getRealPathFromUri_BelowApi11(Context context, Uri uri) {
String filePath = null;
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
cursor.close();
}
return filePath;
}

}
---------------------------------------------------------------------------------------------
OK  全部就在这里了   当作工具类用的