1 /* 2 * Copyright (C) 2017 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.leanback; 18 19 import android.graphics.Bitmap; 20 import android.graphics.BitmapFactory; 21 import android.graphics.Canvas; 22 import android.graphics.Color; 23 import android.graphics.Paint; 24 25 import java.io.File; 26 27 /** 28 * Sample PlaybackSeekDataProvider that reads bitmaps stored on disk. 29 * e.g. new PlaybackSeekDiskDataProvider(duration, 1000, "/sdcard/frame_%04d.jpg") 30 * Expects the seek positions are 1000ms interval, snapshots are stored at 31 * /sdcard/frame_0001.jpg, ... 32 */ 33 class PlaybackSeekDiskDataProvider extends PlaybackSeekAsyncDataProvider { 34 35 final Paint mPaint; 36 final String mPathPattern; 37 PlaybackSeekDiskDataProvider(long duration, long interval, String pathPattern) { 38 mPathPattern = pathPattern; 39 int size = (int) (duration / interval) + 1; 40 long[] pos = new long[size]; 41 for (int i = 0; i < pos.length; i++) { 42 pos[i] = i * duration / pos.length; 43 } 44 setSeekPositions(pos); 45 mPaint = new Paint(); 46 mPaint.setTextSize(16); 47 mPaint.setColor(Color.BLUE); 48 } 49 50 protected Bitmap doInBackground(Object task, int index, long position) { 51 try { 52 Thread.sleep(100); 53 } catch (InterruptedException ex) { 54 // Thread might be interrupted by cancel() call. 55 } 56 if (isCancelled(task)) { 57 return null; 58 } 59 String path = String.format(mPathPattern, (index + 1)); 60 if (new File(path).exists()) { 61 return BitmapFactory.decodeFile(path); 62 } else { 63 Bitmap bmp = Bitmap.createBitmap(160, 160, Bitmap.Config.ARGB_8888); 64 Canvas canvas = new Canvas(bmp); 65 canvas.drawColor(Color.YELLOW); 66 canvas.drawText(path, 10, 80, mPaint); 67 canvas.drawText(Integer.toString(index), 10, 150, mPaint); 68 return bmp; 69 } 70 } 71 72 } 73
