<integer name="config_workspaceDefaultScreen">0</integer>

public View getQsbBar() {
  if (mQsbBar == null) {
    mQsbBar = mInflater.inflate(R.layout.search_bar, mSearchDropTargetBar, false);
-       mSearchDropTargetBar.addView(mQsbBar);
  }
+    mQsbBar.setVisibility(View.GONE);
  return mQsbBar;
}
@Override
public void bindSearchablesChanged() { //注释该方法内容
/*    boolean searchVisible = updateGlobalSearchIcon();
  boolean voiceVisible = updateVoiceSearchIcon(searchVisible);
  if (mSearchDropTargetBar != null) {
    mSearchDropTargetBar.onSearchPackagesChanged(searchVisible, voiceVisible);
  }
*/
}

// Layout the search bar
  //注释如下内容
/*    View qsbBar = launcher.getQsbBar();
  LayoutParams vglp = qsbBar.getLayoutParams();
  vglp.width = LayoutParams.MATCH_PARENT;
  vglp.height = LayoutParams.MATCH_PARENT;
  qsbBar.setLayoutParams(vglp);
*/

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="apps_componentName" translatable="false">
  <item>ComponentInfo{com.android.vending/com.android.vending.AssetBrowserActivity}</item>
  <item>ComponentInfo{com.android.browser/com.android.browser.BrowserActivity}</item>
  <item>ComponentInfo{com.android.settings/com.android.settings.Settings}</item>
  <item>ComponentInfo{com.android.camera2/com.android.camera.CameraLauncher}</item>
  <item>ComponentInfo{com.android.mms/com.android.mms.ui.ConversationList}</item>
</string-array>
</resources>

 import java.util.Arrays;
 import java.util.List;
  public static List<String> getAppsComponentName(final Context context) {
    return Arrays.asList(context.getResources().getStringArray(R.array.apps_componentName));
  }
src/com/android/launcher3/LauncherModel.java
 protected int mPreviousConfigMcc;
  static List<String> appArray = new ArrayList<String>();
  LauncherModel(LauncherAppState app, IconCache iconCache, AppFilter appFilter) {
    ......
    mUserManager = UserManagerCompat.getInstance(context);
    appArray = Utilities.getAppsComponentName(context);
  }

public static final void sortApps(ArrayList<AppInfo> apps) {
  int length = appArray.size();
  List<AppInfo> assignApps = new ArrayList<AppInfo>();
  for(int i=0;i<length;i++) {
    assignApps.add(i, null);
  }
  for(AppInfo app : apps){
    for(int k=0; k<length; k++){
      if (app.componentName.toString().equals(appArray.get(k))) {
        assignApps.set(k,app );
        continue;
      }
    }
  }
  for (int i =length -1;i > -1 ;i--) {
   AppInfo app = assignApps.get(i);
   if(app != null){
     apps.remove(app);
     apps.add(0, app);
   }
 }
 Log.d(TAG ,"The Apps List after Sort!");
}

public void setApps(ArrayList<AppInfo> list) {
    if (!LauncherAppState.isDisableAllApps()) {
      ......
      SprdAppSortAddonStub.getInstance().sortApps(mApps);
      LauncherModel.sortApps(mApps);//在原来排序的基础上，再将arrays.xml中配置的应用按顺序排在前面。
      updatePageCountsAndInvalidateData();
    }
}
private void addAppsWithoutInvalidate(ArrayList<AppInfo> list) {
    ......
    // SPRD: bug375932 2014-12-02 Feature customize app icon sort.
    SprdAppSortAddonStub.getInstance().sortApps(mApps);
    LauncherModel.sortApps(mApps);//在原来排序的基础上，再将arrays.xml中配置的应用按顺序排在前面。
}

deviceProfiles.add(new DeviceProfile("Super Short Stubby",
    255, 300, 2, 3, 48, 13, (hasAA ? 3 : 5), 48, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Shorter Stubby",
    255, 400, 3, 3, 48, 13, (hasAA ? 3 : 5), 48, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Short Stubby",
    275, 420, 3, 4, 48, 13, (hasAA ? 5 : 5), 48, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Stubby",
    255, 450, 3, 4, 48, 13, (hasAA ? 5 : 5), 48, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Nexus S",
    296, 491.33f, 4, 4, 48, 13, (hasAA ? 5 : 5), 48, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Nexus 4",
    335, 567, 4, 4, DEFAULT_ICON_SIZE_DP, 13, (hasAA ? 5 : 5), 56, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Nexus 5",
    359, 567, 4, 4, DEFAULT_ICON_SIZE_DP, 13, (hasAA ? 5 : 5), 56, R.xml.default_workspace_4x4));
deviceProfiles.add(new DeviceProfile("Large Phone",
    406, 694, 5, 5, 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
deviceProfiles.add(new DeviceProfile("Nexus 7",
    575, 904, 5, 6, 72, 14.4f, 7, 60, R.xml.default_workspace_5x6));
// Larger tablet profiles always have system bars on the top & bottom
deviceProfiles.add(new DeviceProfile("Nexus 10",
    727, 1207, 5, 6, 76, 14.4f, 7, 64, R.xml.default_workspace_5x6));
deviceProfiles.add(new DeviceProfile("20-inch Tablet",
    1527, 2527, 7, 7, 100, 20, 7, 72, R.xml.default_workspace_4x4));

mMinWidth = dpiFromPx(minWidthPx, dm);
mMinHeight = dpiFromPx(minHeightPx, dm);

mProfile = new DeviceProfile(context, deviceProfiles,
        mMinWidth, mMinHeight,
        widthPx, heightPx,
        awPx, ahPx,
        resources);
src/com/android/launcher3/DeviceProfile.java
  DeviceProfile(Context context,
         ArrayList<DeviceProfile> profiles,
         float minWidth, float minHeight,
         int wPx, int hPx,
         int awPx, int ahPx,
         Resources res) { 

DeviceProfile closestProfile = findClosestDeviceProfile(minWidth, minHeight, points);
......

defaultLayoutId = closestProfile.defaultLayoutId; 

private CacheEntry cacheLocked(ComponentName componentName, ResolveInfo info,  private CacheEntry cacheLocked(ComponentName componentName, ResolveInfo info,
    HashMap<Object, CharSequence> labelCache) {
  CacheEntry entry = mCache.get(componentName);
  if (entry == null) {
    entry = new CacheEntry();
    mCache.put(componentName, entry);
    ComponentName key = LauncherModel.getComponentNameFromResolveInfo(info);
    if (labelCache != null && labelCache.containsKey(key)) {
      entry.title = labelCache.get(key).toString();
    } else {
      entry.title = info.loadLabel(mPackageManager).toString();
      if (labelCache != null) {
        labelCache.put(key, entry.title);
      }
    }
    if (entry.title == null) {
      entry.title = info.activityInfo.name;
    }
    Drawable icon;
    int index = sysIndexOf(componentName.getClassName());
    Log.i("jxt", "index:"+index+",Name:"+componentName.getClassName());
    icon = getFullResIcon(info);
    if (index >= 0) {
      entry.icon = Utilities.createIconBitmap(icon, mContext);
    } else {
      entry.icon = Utilities.createIconBitmap(
          /* SPRD: Feature 253522, Remove the application drawer view @{ */
          // getFullResIcon(info), mContext);
          icon, mContext, true);
    }
    /* 此处即为替换图标代码 {@*/
    if("第三方应用的componentName".equals(componentName.toString())){
      entry.icon = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.xxx);
    }
    /* @} */
  }
  return entry;
}  

class LauncherClings implements OnClickListener {
     ......
     private static final String TAG_CROP_TOP_AND_SIDES = "crop_bg_top_and_sides
    private static final boolean DISABLE_CLINGS = false;
    private static final boolean DISABLE_CLINGS = true;

protected static String getFileExtension(String requestFormat) {
    String outputFormat = (requestFormat == null)
        ? "jpg"//修改为"png"
        : requestFormat;
    outputFormat = outputFormat.toLowerCase();
    return (outputFormat.equals("png") || outputFormat.equals("gif"))
        ? "png" // We don't support gif compression.
        : "jpg";
}

if (crop.compress(CompressFormat.JPEG, DEFAULT_COMPRESS_QUALITY, tmpOut))

if (crop.compress(CompressFormat.PNG, DEFAULT_COMPRESS_QUALITY, tmpOut))