Picasso加載一張圖片

目錄

Picasso加載一張圖片的流程

  • 創(chuàng)建

    //通過定義一個(gè)PicassoProvider來獲取Context
    //單例創(chuàng)建Picasso實(shí)例  
    public static Picasso get() {
        if (singleton == null) {
          synchronized (Picasso.class) {
            if (singleton == null) {
              if (PicassoProvider.context == null) {
                throw new IllegalStateException("context == null");
              }
              singleton = new Builder(PicassoProvider.context).build();
            }
          }
        }
        return singleton;
      }
    
    //在AndroidManifest.xml中聲明
    @RestrictTo(LIBRARY)
    public final class PicassoProvider extends ContentProvider {
    
      @SuppressLint("StaticFieldLeak") static Context context;
    
      @Override public boolean onCreate() {
        context = getContext();
        return true;
      }
    }
    
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build( ) 創(chuàng)建Picasso實(shí)例

/** Create the {@link Picasso} instance. */
public Picasso build() {
  Context context = this.context;

  //創(chuàng)建默認(rèn)下載器
  if (downloader == null) {
    downloader = new OkHttp3Downloader(context);
  }
  
  //創(chuàng)建LRU內(nèi)存緩存
  if (cache == null) {
    cache = new LruCache(context);
  }
  
  //創(chuàng)建線程池,默認(rèn)有3個(gè)執(zhí)行線程
  if (service == null) {
    service = new PicassoExecutorService();
  }
  
  //創(chuàng)建默認(rèn)transformer
  if (transformer == null) {
    transformer = RequestTransformer.IDENTITY;
  }

  //統(tǒng)計(jì)
  Stats stats = new Stats(cache);

  //調(diào)度
  Dispatcher dispatcher = new Dispatcher(context, service, HANDLER, downloader, cache, stats);

  return new Picasso(context, dispatcher, cache, listener, transformer, requestHandlers, stats,
      defaultBitmapConfig, indicatorsEnabled, loggingEnabled);
}

//Picasso構(gòu)造方法 對(duì)象賦值&創(chuàng)建一個(gè)新對(duì)象
//最主要的是初始化了allRequestHandlers 除了自定義的extraRequestHandlers  添加了7個(gè)默認(rèn)的RequestHandler
Picasso(Context context, Dispatcher dispatcher, Cache cache, Listener listener,
    RequestTransformer requestTransformer, List<RequestHandler> extraRequestHandlers, Stats stats,
    Bitmap.Config defaultBitmapConfig, boolean indicatorsEnabled, boolean loggingEnabled) {
  this.context = context;
  this.dispatcher = dispatcher;
  this.cache = cache;
  this.listener = listener;
  this.requestTransformer = requestTransformer;
  this.defaultBitmapConfig = defaultBitmapConfig;

  int builtInHandlers = 7; // Adjust this as internal handlers are added or removed.
  int extraCount = (extraRequestHandlers != null ? extraRequestHandlers.size() : 0);
  List<RequestHandler> allRequestHandlers = new ArrayList<>(builtInHandlers + extraCount);

  allRequestHandlers.add(new ResourceRequestHandler(context));
  if (extraRequestHandlers != null) {
    allRequestHandlers.addAll(extraRequestHandlers);
  }
  allRequestHandlers.add(new ContactsPhotoRequestHandler(context));
  allRequestHandlers.add(new MediaStoreRequestHandler(context));
  allRequestHandlers.add(new ContentStreamRequestHandler(context));
  allRequestHandlers.add(new AssetRequestHandler(context));
  allRequestHandlers.add(new FileRequestHandler(context));
  allRequestHandlers.add(new NetworkRequestHandler(dispatcher.downloader, stats));
  requestHandlers = Collections.unmodifiableList(allRequestHandlers);
  //省略...
}
public abstract class RequestHandler {
  
  //來判斷當(dāng)前類型的RequestHandler能否處理request
  public abstract boolean canHandleRequest(Request data);
  
  //使用傳入的requst來加載圖片,加載的結(jié)果放入Result中返回
  @Nullable
  public abstract Result load(Request request, int networkPolicy) throws IOException;

  //待定
  int getRetryCount() {
    return 0;
  }

  //待定
  boolean shouldRetry(boolean airplaneMode, NetworkInfo info) {
    return false;
  }

  //待定
  boolean supportsReplay() {
    return false;
  }
}

創(chuàng)建好Picasso實(shí)例后,便是load了

//load的幾個(gè)重載方法最后都會(huì)來調(diào)用參數(shù)為Uri的方法 生成一個(gè)RequestCreator,
//來執(zhí)行接下來的trannform() rotate() into()等操作
public RequestCreator load(@Nullable Uri uri) {
  return new RequestCreator(this, uri, 0);
}
  • 入隊(duì)

    //通過構(gòu)造方法傳入一個(gè)Picasso實(shí)例的引用,并且創(chuàng)建一個(gè)Request.Builder()的實(shí)例
    //為創(chuàng)建一個(gè)Request做準(zhǔn)備
    RequestCreator(Picasso picasso, Uri uri, int resourceId) {
      if (picasso.shutdown) {
        throw new IllegalStateException(
            "Picasso instance already shut down. Cannot submit new requests.");
      }
      this.picasso = picasso;
      this.data = new Request.Builder(uri, resourceId, picasso.defaultBitmapConfig);
    }
    

    將我們需要加載的圖片的信息都保存在data里面,我們?cè)O(shè)置centerCrop( )或者transform( )實(shí)際上都是對(duì)data內(nèi)對(duì)應(yīng)的變量標(biāo)識(shí)進(jìn)行設(shè)置,然后在into( )中進(jìn)行build 生成一個(gè)Request,

    然后看一下into( )方法的實(shí)現(xiàn)

    public void into(ImageView target, Callback callback) {
      long started = System.nanoTime();
      //檢查是否在主線程
      checkMain();
    
      if (target == null) {
        throw new IllegalArgumentException("Target must not be null.");
      }
    
      //如果沒有設(shè)置要加載的圖片的Uri或者resourceId,直接設(shè)置占位圖然后返回
      if (!data.hasImage()) {
        picasso.cancelRequest(target);
        if (setPlaceholder) {
          setPlaceholder(target, getPlaceholderDrawable());
        }
        return;
      }
    
      //是否延時(shí)加載,也就是選擇fit()模式
      if (deferred) {
        if (data.hasSize()) {
          throw new IllegalStateException("Fit cannot be used with resize.");
        }
        int width = target.getWidth();
        int height = target.getHeight();
        if (width == 0 || height == 0) {
          if (setPlaceholder) {
            setPlaceholder(target, getPlaceholderDrawable());
          }
          //監(jiān)聽I(yíng)mageView的ViewTreeObserver.OnPreDrawListener接口,一旦ImageView
          //的寬高被賦值,就按照ImageView的寬高繼續(xù)加載.
          picasso.defer(target, new DeferredRequestCreator(this, target, callback));
          return;
        }
        data.resize(width, height);
      }
    
      //構(gòu)建request
      Request request = createRequest(started);
      String requestKey = createKey(request);
    
      //是否要從內(nèi)存中讀取
      if (shouldReadFromMemoryCache(memoryPolicy)) {
        Bitmap bitmap = picasso.quickMemoryCacheCheck(requestKey);
        if (bitmap != null) {
          picasso.cancelRequest(target);
          setBitmap(target, picasso.context, bitmap, MEMORY, noFade, picasso.indicatorsEnabled);
          if (picasso.loggingEnabled) {
            log(OWNER_MAIN, VERB_COMPLETED, request.plainId(), "from " + MEMORY);
          }
          if (callback != null) {
            callback.onSuccess();
          }
          return;
        }
      }
    
      //緩存中沒有,先設(shè)置占位圖,然后構(gòu)建一個(gè)ImageViewAction
      if (setPlaceholder) {
        setPlaceholder(target, getPlaceholderDrawable());
      }
      //Action的實(shí)現(xiàn)類保存了這次加載需要的所有信息,還提供了加載完成后的回調(diào)方法
      Action action =
          new ImageViewAction(picasso, target, request, memoryPolicy, networkPolicy, errorResId,
              errorDrawable, requestKey, tag, callback, noFade);
      
      //將Action對(duì)象提交到隊(duì)列
      picasso.enqueueAndSubmit(action);
    }
    
    void enqueueAndSubmit(Action action) {
      Object target = action.getTarget();
      if (target != null && targetToAction.get(target) != action) {
        // This will also check we are on the main thread.
        cancelExistingRequest(target);
        targetToAction.put(target, action);
      }
      
      //提交Action 最后轉(zhuǎn)到Dispatcher類的 dispatchSubmit方法
      submit(action);
    }
    
    void submit(Action action) {
      dispatcher.dispatchSubmit(action);
    }
    
    //Dispatcher類的dispatchXXX系列方法都是通過一個(gè)Handler來發(fā)送消息
    

    看一下Dispatcher的主要實(shí)現(xiàn)

    Dispatcher(Context context, ExecutorService service, Handler mainThreadHandler,
        Downloader downloader, Cache cache, Stats stats) {
      this.dispatcherThread = new DispatcherThread();
      this.dispatcherThread.start();    
      this.handler = new DispatcherHandler(dispatcherThread.getLooper(), this);
      this.mainThreadHandler = mainThreadHandler;
    }
    
      void dispatchSubmit(Action action) {
        handler.sendMessage(handler.obtainMessage(REQUEST_SUBMIT, action));
      }
    
      static class DispatcherThread extends HandlerThread {
      DispatcherThread() {
        super(Utils.THREAD_PREFIX + DISPATCHER_THREAD_NAME, THREAD_PRIORITY_BACKGROUND);
      }
    }
    
      private static class DispatcherHandler extends Handler {
        private final Dispatcher dispatcher;
    
        DispatcherHandler(Looper looper, Dispatcher dispatcher) {
          super(looper);
          this.dispatcher = dispatcher;
        }
    
        @Override public void handleMessage(final Message msg) {
          switch (msg.what) {
            case REQUEST_SUBMIT: {
              Action action = (Action) msg.obj;
              dispatcher.performSubmit(action);
              break;
              //省略...
            }
          }
        }
    

    首先自己創(chuàng)建了一個(gè)DispatcherThread子線程,然后創(chuàng)建了DispatcherHandler對(duì)象,用這個(gè)Handler來進(jìn)行發(fā)送消息,而在DispatcherHandler的handleMessage中,最終調(diào)用了dispatcher.performXXX(action);等方法

  • 執(zhí)行、解碼、變化

    來看一下performSubmit( )方法的實(shí)現(xiàn)

      void performSubmit(Action action, boolean dismissFailed) {
        //如果pausedActions包含這個(gè)Action,則暫停
        if (pausedTags.contains(action.getTag())) {
          pausedActions.put(action.getTarget(), action);
          if (action.getPicasso().loggingEnabled) {
            log(OWNER_DISPATCHER, VERB_PAUSED, action.request.logId(),
                "because tag '" + action.getTag() + "' is paused");
          }
          return;
        }
    
        //此Action對(duì)應(yīng)的hunter存在,attach后直接返回
        BitmapHunter hunter = hunterMap.get(action.getKey());
        if (hunter != null) {
          hunter.attach(action);
          return;
        }
    
        if (service.isShutdown()) {
          if (action.getPicasso().loggingEnabled) {
            log(OWNER_DISPATCHER, VERB_IGNORED, action.request.logId(), "because shut down");
          }
          return;
        }
    
        //構(gòu)建hunter對(duì)象 實(shí)現(xiàn)了Runnable接口
        hunter = forRequest(action.getPicasso(), this, cache, stats, action);
        //通過ExecutorService執(zhí)行hunter,并返回future對(duì)象。
        //提交線程池執(zhí)行
        hunter.future = service.submit(hunter);
        //將構(gòu)造好的hunter對(duì)象加入到hunterMap緩存起來
        hunterMap.put(action.getKey(), hunter);
        if (dismissFailed) {
          failedActions.remove(action.getTarget());
        }
        if (action.getPicasso().loggingEnabled) {
          log(OWNER_DISPATCHER, VERB_ENQUEUED, action.request.logId());
        }
      }
    
      static BitmapHunter forRequest(Picasso picasso, Dispatcher dispatcher, Cache cache, Stats stats,
          Action action) {
        Request request = action.getRequest();
        List<RequestHandler> requestHandlers = picasso.getRequestHandlers();
    
        //通過遍歷所有的requestHandlers(包括自定的和默認(rèn)添加的那7個(gè))尋找能處理這個(gè)Request的requestHandler
        //使用這個(gè)requestHandler來構(gòu)建BitmapHunter
        for (int i = 0, count = requestHandlers.size(); i < count; i++) {
          RequestHandler requestHandler = requestHandlers.get(i);
          if (requestHandler.canHandleRequest(request)) {
            return new BitmapHunter(picasso, dispatcher, cache, stats, action, requestHandler);
          }
        }
    
        return new BitmapHunter(picasso, dispatcher, cache, stats, action, ERRORING_HANDLER);
      }
    
    //BitmapHunter實(shí)現(xiàn)了Runable接口,并且通過ExecutorService來執(zhí)行,接下來就看一下BitmapHunter的run( )方法
    @Override
    public void run() {
      try {
        updateThreadName(data);
    
        if (picasso.loggingEnabled) {
          log(OWNER_HUNTER, VERB_EXECUTING, getLogIdsForHunter(this));
        }
    
        //調(diào)用hunt()方法并且返回一個(gè)Bitmap對(duì)象
        result = hunt();
    
        //然后根絕結(jié)果調(diào)用Dispatcher的dispatchXXX系列方法來發(fā)送不同的消息
        if (result == null) {
          dispatcher.dispatchFailed(this);
        } else {
          dispatcher.dispatchComplete(this);
        }
      } catch (NetworkRequestHandler.ResponseException e) {
        if (!NetworkPolicy.isOfflineOnly(e.networkPolicy) || e.code != 504) {
          exception = e;
        }
        dispatcher.dispatchFailed(this);
      } catch (IOException e) {
        exception = e;
        dispatcher.dispatchRetry(this);
      } catch (OutOfMemoryError e) {
        StringWriter writer = new StringWriter();
        stats.createSnapshot().dump(new PrintWriter(writer));
        exception = new RuntimeException(writer.toString(), e);
        dispatcher.dispatchFailed(this);
      } catch (Exception e) {
        exception = e;
        dispatcher.dispatchFailed(this);
      } finally {
        Thread.currentThread().setName(Utils.THREAD_IDLE_NAME);
      }
    }
    
    /**
     * Global lock for bitmap decoding to ensure that we are only decoding one at a time. Since
     * this will only ever happen in background threads we help avoid excessive memory thrashing as
     * well as potential OOMs. Shamelessly stolen from Volley.
     */
    private static final Object DECODE_LOCK = new Object();
    
    //hunter方法
    Bitmap hunt() throws IOException {
      Bitmap bitmap = null;
    
      //是否可以從緩存中讀取
      if (shouldReadFromMemoryCache(memoryPolicy)) {
        bitmap = cache.get(key);
        if (bitmap != null) {
          stats.dispatchCacheHit();
          loadedFrom = MEMORY;
          if (picasso.loggingEnabled) {
            log(OWNER_HUNTER, VERB_DECODED, data.logId(), "from cache");
          }
          return bitmap;
        }
      }
    
      networkPolicy = retryCount == 0 ? NetworkPolicy.OFFLINE.index : networkPolicy;
      //調(diào)用requestHandler的load方法得到一個(gè)result
      //load方法在不同的requestHandler中有不同的實(shí)現(xiàn)
      //(解碼)
      RequestHandler.Result result = requestHandler.load(data, networkPolicy);
      if (result != null) {
        loadedFrom = result.getLoadedFrom();
        exifOrientation = result.getExifOrientation();
        bitmap = result.getBitmap();
    
        // If there was no Bitmap then we need to decode it from the stream.
        if (bitmap == null) {
          Source source = result.getSource();
          try {
            bitmap = decodeStream(source, data);
          } finally {
            try {
              //noinspection ConstantConditions If bitmap is null then source is guranteed non-null.
              source.close();
            } catch (IOException ignored) {
            }
          }
        }
      }
    
      if (bitmap != null) {
        if (picasso.loggingEnabled) {
          log(OWNER_HUNTER, VERB_DECODED, data.logId());
        }
        stats.dispatchBitmapDecoded(bitmap);
        //處理Transformation(變化)
        if (data.needsTransformation() || exifOrientation != 0) {
          //圖片在轉(zhuǎn)化的時(shí)候需要一片臨時(shí)內(nèi)存,加全局鎖解決瞬時(shí)OOOM的問題
          //或者使用synchronized(BitmapHunter.class){}
          synchronized (DECODE_LOCK) {
            if (data.needsMatrixTransform() || exifOrientation != 0) {
              bitmap = transformResult(data, bitmap, exifOrientation);
              if (picasso.loggingEnabled) {
                log(OWNER_HUNTER, VERB_TRANSFORMED, data.logId());
              }
            }
            if (data.hasCustomTransformations()) {
              bitmap = applyCustomTransformations(data.transformations, bitmap);
              if (picasso.loggingEnabled) {
                log(OWNER_HUNTER, VERB_TRANSFORMED, data.logId(), "from custom transformations");
              }
            }
          }
          
          if (bitmap != null) {
            stats.dispatchBitmapTransformed(bitmap);
          }
        }
      }
    
      //返回Bitmap
      return bitmap;
    }
    

    最后拿到result之后,會(huì)調(diào)用dispatcher.dispatchComplete(this),最終會(huì)調(diào)用dispatcher.performComplete()方法

  • 批處理

      void performComplete(BitmapHunter hunter) {
        //是否加入緩存
        if (shouldWriteToMemoryCache(hunter.getMemoryPolicy())) {
          cache.set(hunter.getKey(), hunter.getResult());
        }
        //完成后hunterMap中移除
        hunterMap.remove(hunter.getKey());
        batch(hunter);
        if (hunter.getPicasso().loggingEnabled) {
          log(OWNER_DISPATCHER, VERB_BATCHED, getLogIdsForHunter(hunter), "for completion");
        }
      }
    
      //批處理
      private void batch(BitmapHunter hunter) {
        if (hunter.isCancelled()) {
          return;
        }
        if (hunter.result != null) {
          hunter.result.prepareToDraw();
        }
        batch.add(hunter);
        if (!handler.hasMessages(HUNTER_DELAY_NEXT_BATCH)) {
          //Handler中調(diào)用performBatchComplete
          handler.sendEmptyMessageDelayed(HUNTER_DELAY_NEXT_BATCH, BATCH_DELAY);
        }
      }
    
      void performBatchComplete() {
        List<BitmapHunter> copy = new ArrayList<>(batch);
        batch.clear();
        //消息發(fā)動(dòng)到主線程進(jìn)行處理
        mainThreadHandler.sendMessage(mainThreadHandler.obtainMessage(HUNTER_BATCH_COMPLETE, copy));
        logBatch(copy);
      }
    
    //mainThreadHandler中
    //...
    case HUNTER_BATCH_COMPLETE: {
            @SuppressWarnings("unchecked")
            List<BitmapHunter> batch = (List<BitmapHunter>) msg.obj;
            //noinspection ForLoopReplaceableByForEach
            for (int i = 0, n = batch.size(); i < n; i++) {
              BitmapHunter hunter = batch.get(i);
              //調(diào)用Picasso#complete方法
              hunter.picasso.complete(hunter);
            }
            break;
          }
    //...
    
  • 完成、分發(fā)

    接著看一下Picasso#complete( )方法的實(shí)現(xiàn)

      void complete(BitmapHunter hunter) {
        //獲取執(zhí)行的那個(gè)Action
        Action single = hunter.getAction();
        //獲取被添加進(jìn)來的Action
        List<Action> joined = hunter.getActions();
    
        boolean hasMultiple = joined != null && !joined.isEmpty();
        boolean shouldDeliver = single != null || hasMultiple;
        
        if (!shouldDeliver) {
          return;
        }
    
        Uri uri = hunter.getData().uri;
        Exception exception = hunter.getException();
        Bitmap result = hunter.getResult();
        LoadedFrom from = hunter.getLoadedFrom();
    
        //分發(fā)
        if (single != null) {
          deliverAction(result, from, single, exception);
        }
    
        if (hasMultiple) {
          //noinspection ForLoopReplaceableByForEach
          for (int i = 0, n = joined.size(); i < n; i++) {
            Action join = joined.get(i);
            deliverAction(result, from, join, exception);
          }
        }
    
        if (listener != null && exception != null) {
          listener.onImageLoadFailed(this, uri, exception);
        }
      }
    
      //deliverAction的實(shí)現(xiàn)
      //此方法的主要實(shí)現(xiàn)就是回調(diào)Action的complete方法或者error方法
      private void deliverAction(Bitmap result, LoadedFrom from, Action action, Exception e) {
        if (action.isCancelled()) {
          return;
        }
        if (!action.willReplay()) {
          targetToAction.remove(action.getTarget());
        }
        if (result != null) {
          if (from == null) {
            throw new AssertionError("LoadedFrom cannot be null.");
          }
          action.complete(result, from);
          if (loggingEnabled) {
            log(OWNER_MAIN, VERB_COMPLETED, action.request.logId(), "from " + from);
          }
        } else {
          action.error(e);
          if (loggingEnabled) {
            log(OWNER_MAIN, VERB_ERRORED, action.request.logId(), e.getMessage());
          }
        }
      }
    
  • 顯示

    之前分析是看到,這個(gè)加載流程這里的Action是ImageViewAction,下面看一下ImageViewAction對(duì)應(yīng)的實(shí)現(xiàn)

    @Override
    public void complete(Bitmap result, Picasso.LoadedFrom from) {
      if (result == null) {
        throw new AssertionError(
            String.format("Attempted to complete action with no result!\n%s", this));
      }
    
      //獲取要顯示的ImageView
      ImageView target = this.target.get();
      if (target == null) {
        return;
      }
    
      Context context = picasso.context;
      boolean indicatorsEnabled = picasso.indicatorsEnabled;
      //通過PicassoDrawable來將bitmap設(shè)置到ImageView上
      PicassoDrawable.setBitmap(target, context, result, from, noFade, indicatorsEnabled);
    
      if (callback != null) {
        callback.onSuccess();
      }
    }
    //使用PicassoDrawable來設(shè)置Bitmap,主要是為了設(shè)置漸變的加載動(dòng)畫
    
  • PicassoDrawable漸變動(dòng)畫

     PicassoDrawable(Context context, Bitmap bitmap, Drawable placeholder,
          Picasso.LoadedFrom loadedFrom, boolean noFade, boolean debugging) {
        super(context.getResources(), bitmap);
    
        this.debugging = debugging;
        this.density = context.getResources().getDisplayMetrics().density;
    
        this.loadedFrom = loadedFrom;
    
       //noFade為false,并且不是從內(nèi)存中加載的時(shí)候,才會(huì)有漸變動(dòng)畫
        boolean fade = loadedFrom != MEMORY && !noFade;
        if (fade) {
          this.placeholder = placeholder;
          animating = true;
          startTimeMillis = SystemClock.uptimeMillis();
        }
      }
    
      @Override public void draw(Canvas canvas) {
        if (!animating) {
          super.draw(canvas);
        } else {
          float normalized = (SystemClock.uptimeMillis() - startTimeMillis) / FADE_DURATION;
          if (normalized >= 1f) {
            animating = false;
            placeholder = null;
            super.draw(canvas);
          } else {
            if (placeholder != null) {
              placeholder.draw(canvas);
            }
    
            //漸變動(dòng)畫
            // setAlpha will call invalidateSelf and drive the animation.
            int partialAlpha = (int) (alpha * normalized);
            super.setAlpha(partialAlpha);
            super.draw(canvas);
            super.setAlpha(alpha);
          }
        }
    
        if (debugging) {
          drawDebugIndicator(canvas);
        }
      }
    
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