1 /* 2 * Copyright (C) 2009 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.android.musicvis.vis1; 18 19 import com.android.musicvis.AudioCapture; 20 21 import android.graphics.Canvas; 22 import android.graphics.Paint; 23 import android.graphics.Rect; 24 import android.media.MediaPlayer; 25 import android.os.Handler; 26 import android.os.SystemClock; 27 import android.service.wallpaper.WallpaperService; 28 import android.util.Log; 29 import android.view.MotionEvent; 30 import android.view.SurfaceHolder; 31 32 import java.util.Arrays; 33 34 public class Visualization1 extends WallpaperService { 35 36 private final Handler mHandler = new Handler(); 37 38 @Override 39 public void onCreate() { 40 super.onCreate(); 41 } 42 43 @Override 44 public void onDestroy() { 45 super.onDestroy(); 46 } 47 48 @Override 49 public Engine onCreateEngine() { 50 return new CubeEngine(); 51 } 52 53 class CubeEngine extends Engine { 54 55 private final Paint mPaint = new Paint(); 56 private float mOffset; 57 private float mTouchX = -1; 58 private float mTouchY = -1; 59 private long mStartTime; 60 private int mWidth; 61 private float mCenterX; 62 private float mCenterY; 63 private AudioCapture mAudioCapture; 64 private int [] mVizData = new int[1024]; 65 66 private final Runnable mDrawCube = new Runnable() { 67 public void run() { 68 drawFrame(); 69 } 70 }; 71 private boolean mVisible; 72 73 CubeEngine() { 74 } 75 76 @Override 77 public void onCreate(SurfaceHolder surfaceHolder) { 78 super.onCreate(surfaceHolder); 79 80 final Paint paint = mPaint; 81 paint.setColor(0xffffffff); 82 paint.setAntiAlias(true); 83 paint.setStrokeWidth(2); 84 paint.setStrokeCap(Paint.Cap.ROUND); 85 paint.setStyle(Paint.Style.STROKE); 86 87 mStartTime = SystemClock.elapsedRealtime(); 88 } 89 90 @Override 91 public void onDestroy() { 92 super.onDestroy(); 93 mHandler.removeCallbacks(mDrawCube); 94 if (mAudioCapture != null) { 95 mAudioCapture.stop(); 96 mAudioCapture.release(); 97 mAudioCapture = null; 98 } 99 } 100 101 @Override 102 public void onVisibilityChanged(boolean visible) { 103 mVisible = visible; 104 if (visible) { 105 if (mAudioCapture == null) { 106 mAudioCapture = new AudioCapture(AudioCapture.TYPE_PCM, 1024); 107 } 108 mAudioCapture.start(); 109 drawFrame(); 110 } else { 111 mHandler.removeCallbacks(mDrawCube); 112 if (mAudioCapture != null) { 113 mAudioCapture.stop(); 114 mAudioCapture.release(); 115 mAudioCapture = null; 116 } 117 } 118 } 119 120 @Override 121 public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { 122 super.onSurfaceChanged(holder, format, width, height); 123 mWidth = width; 124 mCenterX = width/2.0f; 125 mCenterY = height/2.0f; 126 drawFrame(); 127 } 128 129 @Override 130 public void onSurfaceCreated(SurfaceHolder holder) { 131 super.onSurfaceCreated(holder); 132 } 133 134 @Override 135 public void onSurfaceDestroyed(SurfaceHolder holder) { 136 super.onSurfaceDestroyed(holder); 137 mVisible = false; 138 mHandler.removeCallbacks(mDrawCube); 139 } 140 141 @Override 142 public void onOffsetsChanged(float xOffset, float yOffset, 143 float xStep, float yStep, int xPixels, int yPixels) { 144 mOffset = xOffset; 145 drawFrame(); 146 } 147 148 @Override 149 public void onTouchEvent(MotionEvent event) { 150 // touch events don't actually work for wallpapers, but if they did, 151 // we'd be using them to draw a circle around the touch point 152 if (event.getAction() == MotionEvent.ACTION_MOVE) { 153 mTouchX = event.getX(); 154 mTouchY = event.getY(); 155 } else { 156 mTouchX = -1; 157 mTouchY = -1; 158 } 159 super.onTouchEvent(event); 160 } 161 162 void drawFrame() { 163 final SurfaceHolder holder = getSurfaceHolder(); 164 final Rect frame = holder.getSurfaceFrame(); 165 final int width = frame.width(); 166 final int height = frame.height(); 167 168 Canvas c = null; 169 try { 170 c = holder.lockCanvas(); 171 if (c != null) { 172 // draw something 173 drawCube(c); 174 drawTouchPoint(c); 175 } 176 } finally { 177 if (c != null) holder.unlockCanvasAndPost(c); 178 } 179 180 mHandler.removeCallbacks(mDrawCube); 181 if (mVisible) { 182 mHandler.postDelayed(mDrawCube, 1000 / 25); 183 } 184 } 185 186 void drawCube(Canvas c) { 187 c.save(); 188 c.drawColor(0xff000000); 189 190 if (mAudioCapture != null) { 191 mVizData = mAudioCapture.getFormattedData(1, 1); 192 } else { 193 Arrays.fill(mVizData, (int)0); 194 } 195 196 for (int i = 0; i < mWidth; i++) { 197 c.drawPoint(i, mCenterY + mVizData[i], mPaint); 198 } 199 c.restore(); 200 } 201 202 void drawTouchPoint(Canvas c) { 203 if (mTouchX >=0 && mTouchY >= 0) { 204 c.drawCircle(mTouchX, mTouchY, 50, mPaint); 205 } 206 } 207 208 } 209 } 210
