Android7.0开发实现Launcher3去掉应用抽屉的方法详解

public static boolean isDisableAllApps() {
    // Returns false on non-dogfood builds.
    return android.os.SystemProperties.get("ro.wind.launcher3.ishome2","0").equals("1");
}

public boolean isAllAppsButtonRank(int rank) {
    //添加 @{
    if (LauncherAppState.isDisableAllApps()) {
      return false;
      }
    //添加 @}
    return rank == mAllAppsButtonRank;
}

void resetLayout() {
    mContent.removeAllViewsInLayout();
    //添加 @{
    if(LauncherAppState.isDisableAllApps()){
    //添加 }@
    // Add the Apps button
    Context cOntext= getContext();
    LayoutInflater inflater = LayoutInflater.from(context);
    TextView allAppsButton = (TextView)
        inflater.inflate(R.layout.all_apps_button, mContent, false);
    Drawable d = context.getResources().getDrawable(R.drawable.all_apps_button_icon);
    mLauncher.resizeIconDrawable(d);
    allAppsButton.setCompoundDrawables(null, d, null, null);
    allAppsButton.setContentDescription(context.getString(R.string.all_apps_button_label));
    allAppsButton.setOnKeyListener(new HotseatIconKeyEventListener());
    if (mLauncher != null) {
      mLauncher.setAllAppsButton(allAppsButton);
      allAppsButton.setOnTouchListener(mLauncher.getHapticFeedbackTouchListener());
      allAppsButton.setOnClickListener(mLauncher);
      allAppsButton.setOnLongClickListener(mLauncher);
      allAppsButton.setOnFocusChangeListener(mLauncher.mFocusHandler);
    }
    // Note: We do this to ensure that the hotseat is always laid out in the orientation of
    // the hotseat in order regardless of which orientation they were added
    int x = getCellXFromOrder(mAllAppsButtonRank);
    int y = getCellYFromOrder(mAllAppsButtonRank);
    CellLayout.LayoutParams lp = new CellLayout.LayoutParams(x,y,1,1);
    lp.canReorder = false;
    mContent.addViewToCellLayout(allAppsButton, -1, allAppsButton.getId(), lp, true);
    }
}//别漏了这里的 }

//添加 @{
private boolean hasDA = LauncherAppState.isDisableAllApps();
//添加 }@

InvariantDeviceProfile(String n, float w, float h, int r, int c, int fr, int fc, int maapc,
    // Ensure that we have an odd number of hotseat items (since we need to place all apps)
    if (hs % 2 == 0&& !hasDA) {// 在无抽屉情况下不抛异常
      throw new RuntimeException("All Device Profiles must have an odd number of hotseat spaces");
    }
    name = n;
     ...  ...
}

ArrayList getPredefinedDeviceProfiles() {
    ArrayList predefinedDeviceProfiles = new ArrayList<>();
    // width, height, #rows, #columns, #folder rows, #folder columns,
    // iconSize, iconTextSize, #hotseat, #hotseatIconSize, defaultLayoutId.
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Super Short Stubby",
        255, 300,   2, 3, 2, 3, 3, 48, 13, 3, 48, R.xml.default_workspace_4x4));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Shorter Stubby",
        255, 400,   3, 3, 3, 3, 3, 48, 13, 3, 48, R.xml.default_workspace_4x4));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Short Stubby",
        275, 420,   3, 4, 3, 4, 4, 48, 13, (hasDA &＃63; 4 : 5), 48, (hasDA &＃63; R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Stubby",
        255, 450,   3, 4, 3, 4, 4, 48, 13, (hasDA &＃63; 4 : 5), 48, (hasDA &＃63; R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus S",
        296, 491.33f, 4, 4, 4, 4, 4, 48, 13,(hasDA &＃63; 4 : 5), 48, (hasDA &＃63; R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 4",
        335, 567,   4, 4, 4, 4, 4, DEFAULT_ICON_SIZE_DP, 13, (hasDA &＃63; 4 : 5), 56, (hasDA &＃63; R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 5",
        359, 567,   4, 4, 4, 4, 4, DEFAULT_ICON_SIZE_DP, 13,(hasDA &＃63; 4 : 5), 56, (hasDA &＃63; R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Large Phone",
        406, 694,   5, 5, 4, 4, 4, 64, 14.4f, 5, 56, R.xml.default_workspace_5x5));
    // The tablet profile is odd in that the landscape orientation
    // also includes the nav bar on the side
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 7",
        575, 904,   5, 6, 4, 5, 4, 72, 14.4f, 7, 60, R.xml.default_workspace_5x6));
    // Larger tablet profiles always have system bars on the top & bottom
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 10",
        727, 1207,  5, 6, 4, 5, 4, 76, 14.4f, 7, 64, R.xml.default_workspace_5x6));
    predefinedDeviceProfiles.add(new InvariantDeviceProfile("20-inch Tablet",
        1527, 2527,  7, 7, 6, 6, 4, 100, 20, 7, 72, R.xml.default_workspace_4x4));
    return predefinedDeviceProfiles;
}

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).
  keep_running: {
    if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace");
    loadAndBindWorkspace();
    if (mStopped) {
      LauncherLog.i(TAG, "LoadTask break in the middle, this = " + this);
      break keep_running;
    }
    waitForIdle();
    // second step
    if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps");
    loadAndBindAllApps();
    //添加 @{
    if (LauncherAppState.isDisableAllApps()) {
      verifyApplications();
    }
    //添加 }@
  }
  // Clear out this reference, otherwise we end up holding it until all of the
  // callback runnables are done.
  ... ...
}

private void verifyApplications() {
    final Context cOntext= mApp.getContext();
    // Cross reference all the applications in our apps list with items in the workspace
    ArrayList tmpInfos;
    ArrayList added = new ArrayList();
    synchronized (sBgLock) {
      for (AppInfo app : mBgAllAppsList.data) {
        tmpInfos = getItemInfoForComponentName(app.componentName, app.user);
        if (tmpInfos.isEmpty()) {
          // We are missing an application icon, so add this to the workspace
          added.add(app);
          // This is a rare event, so lets log it
          Log.e(TAG, "Missing Application on load: " + app);
        }
      }
    }
    if (!added.isEmpty()) {
      addAndBindAddedWorkspaceItems(context, added);//7.0 虽然去掉了去抽屉的代码，但留了这个方法给我们。
    }
}

public void run() {
  if (!mHasLoaderCompletedOnce) {
    // Loader has not yet run.
    return;
  }
  final Context cOntext= mApp.getContext();
  ... ...
  if (added != null) {
    // 添加 @{
    if(LauncherAppState.isDisableAllApps()){
        final ArrayList addedInfos = new ArrayList(added);
        addAndBindAddedWorkspaceItems(context, addedInfos);
    }else{
    // 添加 }@
    addAppsToAllApps(context, added);
    }
    for (AppInfo ai : added) {
      addedOrUpdatedApps.put(ai.componentName, ai);
    }
  }
  ... ...
}

public static boolean supportsDrop(Object info) {
     //添加 @{
    if (LauncherAppState.isDisableAllApps()) {
      if (info instanceof ShortcutInfo) {
        ShortcutInfo item = (ShortcutInfo) info;
        return item.itemType != LauncherSettings.BaseLauncherColumns.ITEM_TYPE_APPLICATION;
      }
      return info instanceof LauncherAppWidgetInfo;
    }
    //添加 }@
    return (info instanceof ShortcutInfo)
        || (info instanceof LauncherAppWidgetInfo)
        || (info instanceof FolderInfo);
}