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      1 /*
      2  * Copyright (C) 2011 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.supportv4.content;
     18 import android.app.Activity;
     19 import android.content.Intent;
     20 import android.graphics.Bitmap;
     21 import android.graphics.Canvas;
     22 import android.net.Uri;
     23 import android.os.Bundle;
     24 import android.support.v4.content.FileProvider;
     25 import android.view.View;
     26 
     27 import com.example.android.supportv4.R;
     28 
     29 import java.io.File;
     30 import java.io.FileOutputStream;
     31 import java.io.IOException;
     32 import java.io.OutputStream;
     33 
     34 /**
     35  * Sample that shows how private files can be easily shared.
     36  */
     37 public class FileProviderExample extends Activity {
     38     private static final String AUTHORITY = "com.example.android.supportv4.my_files";
     39 
     40     @Override
     41     protected void onCreate(Bundle savedInstanceState) {
     42         super.onCreate(savedInstanceState);
     43         setContentView(R.layout.file_provider_example);
     44     }
     45 
     46     public void onShareFileClick(View view) {
     47         // Save a thumbnail to file
     48         final File thumbsDir = new File(getFilesDir(), "thumbs");
     49         thumbsDir.mkdirs();
     50         final File file = new File(thumbsDir, "private.png");
     51         saveThumbnail(view, file);
     52 
     53         // Now share that private file using FileProvider
     54         final Uri uri = FileProvider.getUriForFile(this, AUTHORITY, file);
     55         final Intent intent = new Intent(Intent.ACTION_SEND);
     56         intent.setType("image/png");
     57         intent.putExtra(Intent.EXTRA_STREAM, uri);
     58         startActivity(intent);
     59     }
     60 
     61     /**
     62      * Save thumbnail of given {@link View} to {@link File}.
     63      */
     64     private void saveThumbnail(View view, File file) {
     65         final Bitmap bitmap = Bitmap.createBitmap(
     66                 view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
     67         final Canvas canvas = new Canvas(bitmap);
     68         view.draw(canvas);
     69 
     70         try {
     71             final OutputStream os = new FileOutputStream(file);
     72             try {
     73                 bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
     74             } finally {
     75                 os.close();
     76             }
     77         } catch (IOException e) {
     78             throw new RuntimeException(e);
     79         }
     80     }
     81 }
     82