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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.apis.os;
     18 
     19 import java.io.File;
     20 import java.io.FileNotFoundException;
     21 import java.io.FileOutputStream;
     22 import java.io.IOException;
     23 import java.io.InputStream;
     24 
     25 import android.content.ContentProvider;
     26 import android.content.ContentValues;
     27 import android.database.Cursor;
     28 import android.net.Uri;
     29 import android.os.ParcelFileDescriptor;
     30 import android.text.TextUtils;
     31 
     32 /**
     33  * A very simple content provider that can serve mms files from our cache directory so that
     34  * SmsManager#sendMultimdeiaMessage and SmsManager#downloadMultimediaMessage can read/write
     35  * the content of the MMS messages to send/download.
     36  */
     37 public class MmsFileProvider extends ContentProvider {
     38     @Override
     39     public boolean onCreate() {
     40         return true;
     41     }
     42 
     43     @Override
     44     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
     45             String sortOrder) {
     46         // Don't support queries.
     47         return null;
     48     }
     49 
     50     @Override
     51     public Uri insert(Uri uri, ContentValues values) {
     52         // Don't support inserts.
     53         return null;
     54     }
     55 
     56     @Override
     57     public int delete(Uri uri, String selection, String[] selectionArgs) {
     58         // Don't support deletes.
     59         return 0;
     60     }
     61 
     62     @Override
     63     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
     64         // Don't support updates.
     65         return 0;
     66     }
     67 
     68     @Override
     69     public String getType(Uri uri) {
     70         // For this sample, assume all files have no type.
     71         return null;
     72     }
     73 
     74     @Override
     75     public ParcelFileDescriptor openFile(Uri uri, String fileMode) throws FileNotFoundException {
     76         File file = new File(getContext().getCacheDir(), uri.getPath());
     77         int mode = (TextUtils.equals(fileMode, "r") ? ParcelFileDescriptor.MODE_READ_ONLY :
     78             ParcelFileDescriptor.MODE_WRITE_ONLY
     79                    |ParcelFileDescriptor.MODE_TRUNCATE
     80                    |ParcelFileDescriptor.MODE_CREATE);
     81         return ParcelFileDescriptor.open(file, mode);
     82     }
     83 }
     84