先画一个Launche启动的流程图，虽然不是特别规范，但是勉强能看看，我也整理下Launcher的一系列的流程图，最近修改Launcher，又对Launcher加深了一些了解，
转载请标明出处：http://blog.csdn.net/wdaming1986/article/details/8267156
大明图（1）
说明：loadWorkspaceFirst，这个是个boolean值，加入代码：
public void run() { // Optimize for end-user experience: if the Launcher is up and // running with the // All Apps interface in the foreground, load All Apps first. Otherwise, load the // workspace first (default). final Callbacks cbk = mCallbacks.get(); final boolean loadWorkspaceFirst = cbk != null ? (!cbk.isAllAppsVisible()) : true; keep_running: { // Elevate priority when Home launches for the first time to avoid // starving at boot time. Staring at a blank home is not cool. synchronized (mLock) { if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to " + (mIsLaunching ? "DEFAULT" : "BACKGROUND")); android.os.Process.setThreadPriority(mIsLaunching ? Process.THREAD_PRIORITY_DEFAULT : Process.THREAD_PRIORITY_BACKGROUND); } // First Step if (loadWorkspaceFirst) { if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace"); loadAndBindWorkspace(); } else { if (DEBUG_LOADERS) Log.d(TAG, "step 1: special: loading all apps"); loadAndBindAllApps(); } if (mStopped) { break keep_running; } // Whew! Hard work done. Slow us down, and wait until the UI thread has // settled down. synchronized (mLock) { if (mIsLaunching) { if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to BACKGROUND"); android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); } } waitForIdle(); // Second step if (loadWorkspaceFirst) { if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps"); loadAndBindAllApps(); } else { if (DEBUG_LOADERS) Log.d(TAG, "step 2: special: loading workspace"); loadAndBindWorkspace(); } // Restore the default thread priority after we are done loading items synchronized (mLock) { android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT); } } // Update the saved icons if necessary if (DEBUG_LOADERS) Log.d(TAG, "Comparing loaded icons to database icons"); for (Object key : sDbIconCache.keySet()) { updateSavedIcon(mContext, (ShortcutInfo) key, sDbIconCache.get(key)); } sDbIconCache.clear(); // Clear out this reference, otherwise we end up holding it until all of the // callback runnables are done. mContext = null; synchronized (mLock) { // If we are still the last one to be scheduled, remove ourselves. if (mLoaderTask == this) { mLoaderTask = null; } } }
这个有Frist Step和Second Step，意思就是，
当loadWorkspaceFirst=true：先加载Workspace，后加载AllApps
当loadWorkspaceFirst=false：或者先加载AllApps，后加载Workspace；
所以我画图的时候用True/False, False/True；