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      1 package com.android.noisefield;
      2 
      3 import android.app.Service;
      4 import android.graphics.PixelFormat;
      5 import android.os.Bundle;
      6 import android.renderscript.RenderScript;
      7 import android.renderscript.RenderScriptGL;
      8 import android.service.wallpaper.WallpaperService;
      9 import android.service.wallpaper.WallpaperService.Engine;
     10 import android.util.DisplayMetrics;
     11 import android.view.SurfaceHolder;
     12 import android.view.WindowManager;
     13 
     14 public class NoiseFieldWallpaper extends WallpaperService {
     15 
     16     @Override
     17     public Engine onCreateEngine() {
     18         return new RenderScriptEngine();
     19     }
     20 
     21     private class RenderScriptEngine extends Engine {
     22         private RenderScriptGL mRenderScript = null;
     23         private NoiseFieldRS mWallpaperRS = null;
     24         private int densityDPI;
     25 
     26         @Override
     27         public void onCreate(SurfaceHolder surfaceHolder) {
     28             super.onCreate(surfaceHolder);
     29             setTouchEventsEnabled(true);
     30             surfaceHolder.setSizeFromLayout();
     31             surfaceHolder.setFormat(PixelFormat.RGB_888);
     32 
     33             DisplayMetrics metrics = new DisplayMetrics();
     34             ((WindowManager) getApplication().getSystemService(Service.WINDOW_SERVICE))
     35                     .getDefaultDisplay().getMetrics(metrics);
     36             densityDPI = metrics.densityDpi;
     37         }
     38 
     39         @Override
     40         public void onDestroy() {
     41             super.onDestroy();
     42             destroyRenderer();
     43         }
     44 
     45         public void destroyRenderer() {
     46             if (mWallpaperRS != null) {
     47                 mWallpaperRS.stop();
     48                 mWallpaperRS = null;
     49             }
     50 
     51             if (mRenderScript != null) {
     52                 mRenderScript.setSurface(null, 0, 0);
     53                 mRenderScript.destroy();
     54                 mRenderScript = null;
     55             }
     56         }
     57 
     58         @Override
     59         public void onSurfaceCreated(SurfaceHolder surfaceHolder) {
     60             super.onSurfaceCreated(surfaceHolder);
     61 
     62             RenderScriptGL.SurfaceConfig sc = new RenderScriptGL.SurfaceConfig();
     63             mRenderScript = new RenderScriptGL(NoiseFieldWallpaper.this, sc);
     64             mRenderScript.setPriority(RenderScript.Priority.LOW);
     65         }
     66 
     67         @Override
     68         public void onSurfaceDestroyed(SurfaceHolder surfaceHolder) {
     69             super.onSurfaceDestroyed(surfaceHolder);
     70             destroyRenderer();
     71         }
     72 
     73         @Override
     74         public void onSurfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {
     75             super.onSurfaceChanged(surfaceHolder, format, width, height);
     76 
     77             if (mRenderScript != null) {
     78                 mRenderScript.setSurface(surfaceHolder, width, height);
     79             }
     80 
     81             if (mWallpaperRS == null) {
     82                 mWallpaperRS = new NoiseFieldRS();
     83                 mWallpaperRS.init(densityDPI, mRenderScript, getResources(), width, height);
     84                 mWallpaperRS.start();
     85             }
     86 
     87             mWallpaperRS.resize(width, height);
     88         }
     89 
     90         @Override
     91         public Bundle onCommand(String action, int x, int y, int z, Bundle extras,
     92                 boolean resultRequested) {
     93             if (mWallpaperRS != null) {
     94                 // return mWallpaperRS.onCommand(action, x, y, z, extras, resultRequested);
     95             }
     96             return null;
     97         }
     98 
     99         @Override
    100         public void onVisibilityChanged(boolean visible) {
    101             super.onVisibilityChanged(visible);
    102             if (mWallpaperRS != null) {
    103                 if (visible) {
    104                     mWallpaperRS.start();
    105                 } else {
    106                     mWallpaperRS.stop();
    107                 }
    108             }
    109         }
    110 
    111         @Override
    112         public void onOffsetsChanged(float xOffset, float yOffset, float xOffsetStep,
    113                 float yOffsetStep, int xPixelOffset, int yPixelOffset) {
    114             mWallpaperRS.setOffset(xOffset, yOffset, xPixelOffset, yPixelOffset);
    115         }
    116     }
    117 }
    118