Android7.0開(kāi)發(fā)實(shí)現(xiàn)Launcher3去掉應(yīng)用抽屜的方法詳解

更新時(shí)間：2017年11月15日 12:34:17 作者：若瑜

這篇文章主要介紹了Android7.0開(kāi)發(fā)實(shí)現(xiàn)Launcher3去掉應(yīng)用抽屜的方法,結(jié)合實(shí)例形式分析了Android7.0 Launcher3調(diào)整界面布局的相關(guān)操作技巧與注意事項(xiàng),需要的朋友可以參考下

本文實(shí)例講述了Android7.0開(kāi)發(fā)實(shí)現(xiàn)Launcher3去掉應(yīng)用抽屜的方法。分享給大家供大家參考，具體如下：

年初做過(guò)一個(gè)項(xiàng)目，有一個(gè)需求就是需要將桌面變?yōu)閱螌硬恍枰?jí)菜單。最近幾次有小伙伴有這個(gè)問(wèn)我這個(gè)解決辦法?，F(xiàn)在我將分享給大家。

先上效果圖:

功能分解

1. 去除Allapp鍵，調(diào)整HotSeat布局
2. 將所有應(yīng)用擺在launcher第一層
3. 去掉長(zhǎng)按時(shí)刪除選項(xiàng)

解決方案

一、設(shè)置總開(kāi)關(guān)

按照6.0 Launcher3 的模式，添加一個(gè)開(kāi)關(guān)，控制是否去掉抽屜。
LauncherAppState類(lèi):單例模式，主要在啟動(dòng)的時(shí)候用，他初始化了一些對(duì)象，并且注冊(cè)了廣播監(jiān)聽(tīng)器和ContentObserver。為了能靈活切換模式,在此類(lèi)中添加靜態(tài)開(kāi)關(guān)。

Launcher3\src\com\android\launcher3\LauncherAppState.java:

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

二、Allapp鍵的加載

在HotSeat里面去掉Allapp鍵的加載，屏蔽isAllAppsButtonRank()占用allapp位置。

1) 不再占用allapp位置

2) 在加載Workspace時(shí),會(huì)留出HotSeat的第三個(gè)位置給allapp按鈕,若不取消該位置的占用,在HotSeat加載時(shí)會(huì)留出空位。HotSeat的初始化在HotSeat.java中

Launcher3\src\com\android\launcher3\HotSeat.java –>isAllAppsButtonRank():

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

3) Home2沒(méi)有抽屜，所以不需要allapp按鈕。在HotSeat里面去掉Allapp鍵的加載，在HotSeat.java 的void resetLayout()中初始化HotSeat布局。在Home2時(shí)停止加載Allapp按鈕。

Launcher3\src\com\android\launcher3\HotSeat.java –>resetLayout():

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);
    }
}//別漏了這里的 }

三、數(shù)據(jù)初始化類(lèi)中更改HotSeat布局

InvariantDeviceProfile.java Launcher3進(jìn)行布局初始化的一個(gè)類(lèi)。

在有allapp按鈕時(shí)HotSeat里Hotseat圖標(biāo)數(shù)量為五個(gè)，沒(méi)有allapp按鈕時(shí)Hotseat圖標(biāo)數(shù)量應(yīng)為四個(gè)。

Launcher3\src\com\android\launcher3\InvariantDeviceProfile.java:

1)先加個(gè)宏控

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

2)去掉抽屜時(shí)，HotSeat的格數(shù)為四格，所以不能拋出異常。 ( numHotseatIcons 為偶時(shí)不拋異常)

InvariantDeviceProfile( ):

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) {// 在無(wú)抽屜情況下不拋異常
      throw new RuntimeException("All Device Profiles must have an odd number of hotseat spaces");
    }
    name = n;
     ...  ...
}

3)去掉抽屜的情況下加載不同的布局

getPredefinedDeviceProfiles() :

ArrayList<InvariantDeviceProfile> getPredefinedDeviceProfiles() {
    ArrayList<InvariantDeviceProfile> 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 ? 4 : 5), 48, (hasDA ? 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 ? 4 : 5), 48, (hasDA ? 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 ? 4 : 5), 48, (hasDA ? 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 ? 4 : 5), 56, (hasDA ? 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 ? 4 : 5), 56, (hasDA ? 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;
}

5)記得改下 dw_phone_hotseat.xml 的布局，因?yàn)镠otseat只有5格了。

四、將所有應(yīng)用放在第一層

launcher3加載流程:進(jìn)入 LauncherApplication -> LauncherAppState -> 進(jìn)行初始化環(huán)境(通過(guò)傳遞sContext)。進(jìn)行事件監(jiān)聽(tīng)&&初始化一些環(huán)境。例如:橫豎屏、當(dāng)局語(yǔ)言、像素密度、小部件和快捷圖標(biāo)數(shù)據(jù)庫(kù)操作對(duì)象、應(yīng)用圖標(biāo)緩存對(duì)象、初始化LauncherMode等。在初始化過(guò)后，從Launcher的Oncreate方法入手。mModel.startLoader(mWorkspace.getRestorePage());里加載數(shù)據(jù) 。在加載完成所有快捷方式后將其余為加載完的應(yīng)用布局在第一層。

1) 成所有快捷方式后將其余為加載完的應(yīng)用布局在第一層。

Launcher3\src\com\android\launcher3\LauncherModel.java:

LauncherModel$LoaderTask –> run():

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.
  ... ...
}

添加verifyApplications():

private void verifyApplications() {
    final Context context = mApp.getContext();
    // Cross reference all the applications in our apps list with items in the workspace
    ArrayList<ItemInfo> tmpInfos;
    ArrayList<ItemInfo> added = new ArrayList<ItemInfo>();
    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 雖然去掉了去抽屜的代碼，但留了這個(gè)方法給我們。
    }
}

五、有新應(yīng)用添加時(shí)更新Workspace

當(dāng)安裝新應(yīng)用時(shí)，我們需要對(duì)左面更新，保證安裝的應(yīng)用添加在第一層上。

Launcher3\src\com\android\launcher3\LauncherModel.java:

LauncherModel$PackageUpdatedTask –> run():

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<ItemInfo> addedInfos = new ArrayList<ItemInfo>(added);
        addAndBindAddedWorkspaceItems(context, addedInfos);
    }else{
    // 添加 }@
    addAppsToAllApps(context, added);
    }
    for (AppInfo ai : added) {
      addedOrUpdatedApps.put(ai.componentName, ai);
    }
  }
  ... ...
}

六、去掉長(zhǎng)按時(shí)的刪除選項(xiàng)

長(zhǎng)按時(shí)，不該有刪除選項(xiàng) 。

DeleteDropTarget.java: 中更改長(zhǎng)按時(shí)的監(jiān)聽(tīng)，開(kāi)始時(shí)直接屏蔽刪除按鈕，后來(lái)發(fā)現(xiàn)應(yīng)用自身發(fā)出的快捷方式無(wú)法刪除所以做了如下處理。

Launcher3\src\com\android\launcher3\DeleteDropTarget.java –>supportsDrop():

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);
}

寫(xiě)在最后

到此，Launcher3去掉應(yīng)用抽屜的改動(dòng)已經(jīng)完成。還有很多我們需要去美化的，就比如HotSeat布局自適應(yīng)等。

更多關(guān)于Android相關(guān)內(nèi)容感興趣的讀者可查看本站專(zhuān)題：《Android窗口相關(guān)操作技巧總結(jié)》、《Android開(kāi)發(fā)入門(mén)與進(jìn)階教程》、《Android調(diào)試技巧與常見(jiàn)問(wèn)題解決方法匯總》、《Android基本組件用法總結(jié)》、《Android視圖View技巧總結(jié)》、《Android布局layout技巧總結(jié)》及《Android控件用法總結(jié)》

希望本文所述對(duì)大家Android程序設(shè)計(jì)有所幫助。

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