Android Launcher3一些默认修改

1.如何设置默认页

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res/values/Config.xml
 
  "config_workspaceDefaultScreen" > 0
 
在Launcher3 桌面,不管在哪一页,按HOME 键,会回到默认页。

2.如何隐藏launcher3中的搜索框

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1 . 在Launcher3/src/com/android/launcher3/Launcher.java中
 
注释updateGlobalIcons()方法调用,共两处。
 
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);
     }
*/
}
 
2 . 在Launcher3/src/com/android/launcher3/DynamicGrid.java中  
 
     // 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);
*/
 
3 . 在Launcher3/res/values/dimens.xml中
 
     -    "dynamic_grid_search_bar_height" >48dp
     +    "dynamic_grid_search_bar_height" >18dp
 
重新编译后即可看到效果。

3.如何调整原生Launcher3主界面的search框的大小?

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修改如下:
定位打/packages/apps/Launcher3/res/values/dimens.xml。
 
"dynamic_grid_edge_margin" >3dp //修改这个可以调整search框距离顶部距离。
"dynamic_grid_search_bar_max_width" >500dp //search框的宽度,一般不需要调整。
"dynamic_grid_search_bar_height" >48dp //search框的高度,不要调整为0,删除按钮需要占用一部分空间。

4.让主菜单部分应用按指定顺序排在前面?

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添加res/values/arrays.xml:需要排序的应用:这里的item 内容一定要填写正确,否则会匹配不上,无法参与排序。
"apps_componentName" translatable= "false" >
     ComponentInfo{com.android.vending/com.android.vending.AssetBrowserActivity}
     ComponentInfo{com.android.browser/com.android.browser.BrowserActivity}
     ComponentInfo{com.android.settings/com.android.settings.Settings}
     ComponentInfo{com.android.camera2/com.android.camera.CameraLauncher}
     ComponentInfo{com.android.mms/com.android.mms.ui.ConversationList}
 
src/com/android/launcher3/Utilities.java
import java.util.Arrays;
import java.util.List;
 
+    public static List 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 appArray = new ArrayList();
     LauncherModel(LauncherAppState app, IconCache iconCache, AppFilter appFilter) {
         ......
         mUserManager = UserManagerCompat.getInstance(context);
+       appArray = Utilities.getAppsComponentName(context);
 
     }
添加如下sortApps 方法:apps 按arrays.xml 排序,在原来的排序基础上,将arrays.xml 配置的应用按顺序排在前面。
arrays.xml中没有涉及到的应用,还是原来的顺序。
public static final void sortApps(ArrayList apps) {
     int length = appArray.size();
     List assignApps = new ArrayList();
     for ( int i= 0 ;i "" app= "" appinfo= "" for = "" i= "" if = "" int = "" k= "0;" > - 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!" );
}
 
 
src/com/android/launcher3/AppsCustomizePagedView.java
 
     public void setApps(ArrayList 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 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。
     }

5.如何确定待机HOME界面布局使用的是哪个default_workspace文件?

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src/com/android/launcher3/DynamicGrid.java
 
选择哪个default_workspace 和 public DynamicGrid(Context context, Resources resources, int minWidthPx,
int minHeightPx, int widthPx, int heightPx, int awPx, int ahPx)中的minWidthPx 和minHeightPx
以及该方法中创建的deviceProfiles 列表关。              
 
minWidthPx 、minHeightPx 值转换为dpi之后 ,deviceProfiles 列表与其进行比较,选择与当前屏幕大小最接近的deviceProfiles 的
default_workSpace作为最终Home界面使用的default_workspace。
 
 
详细解释如下:
 
src/com/android/launcher3/DynamicGrid.java中
 
         1 .deviceProfiles 列表如下:
         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));
 
        2 .重新计算MinWidth 和MinHeigh  单位是dpi。
         mMinWidth = dpiFromPx(minWidthPx, dm);
         mMinHeight = dpiFromPx(minHeightPx, dm);
       3 .创建mProfile,mProfile.defaultLayoutId 就是最终Home界面使用的default_workspace 的id。
         mProfile中的defaultLayoutId 是哪个default_workspace 见DeviceProfile.java。
 
         mProfile = new DeviceProfile(context, deviceProfiles,
                 mMinWidth, mMinHeight,
                 widthPx, heightPx,
                 awPx, ahPx,
                 resources);
 
 
 
src/com/android/launcher3/DeviceProfile.java
 
     DeviceProfile(Context context,
                  ArrayList profiles,
                   float minWidth, float minHeight,
                   int wPx, int hPx,
                   int awPx, int ahPx,
                   Resources res) { 方法中:
        4 .用屏幕宽高创建的点(PointF xy = new PointF(width, height))与 deviceProfiles中的w 和 h 创建的点
(dimens =
new PointF(widthDps, heightDps))进行比较,也就是从deviceProfiles 列表中找出和当前屏幕大小最接近的deviceProfiles。
             DeviceProfile closestProfile = findClosestDeviceProfile(minWidth, minHeight, points);
          ......
 
        5 .采用和当前屏幕大小最接近的deviceProfiles的default_workspace
 
                defaultLayoutId = closestProfile.defaultLayoutId;

6.如何替换第三方应用在launcher上显示的图标?

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在launcher/src/com/android/launcher3/IconCache.java中修改,
private CacheEntry cacheLocked(ComponentName componentName, ResolveInfo info,    private CacheEntry cacheLocked(ComponentName componentName, ResolveInfo info,
         HashMap "" > 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;
}  

7.如何去掉Launcher3的开机引导页面?

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修改方案如下:
请定位到src/com/android/launcher3/LauncherClings.java文件:
     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 ;

8.为何Launcher3设置一些壁纸后,壁纸显示比预览图模糊?

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预览的时候,没有做格式转化,所以显示正常!
在设置壁纸的时候,默认是采用jpeg格式转换的,导致转换后损耗了一些,设置壁纸后,某些对比度比较高的壁纸就显示的模糊!
 
修改方案:
默认修改为采用png格式转换!
 
android6. 0 之前的版本,请做如下修改:
定位到/packages/apps/Launcher3/的WallpaperCropActivity.java文件
1 、String mOutputFormat = "jpg" ; //修改为"png"
2
   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" ;
    }
 
android6. 0 的版本,请做如下修改:
定位到/packages/apps/Launcher3/WallpaperPicker/src/com/android/gallery3d/common/BitmapCropTask.java文件
if (crop.compress(CompressFormat.JPEG, DEFAULT_COMPRESS_QUALITY, tmpOut)) 修改为:
if (crop.compress(CompressFormat.PNG, DEFAULT_COMPRESS_QUALITY, tmpOut))

9.6.0平台上Launcher3自带的壁纸路径是什么?

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6.0 中,平台版本预置了一些壁纸资源,相关路径如下:
资源文件在:
packages/apps/Launcher3/WallpaperPicker/res/drawable-xhdpi/
 
字串文件在:
packages/apps/Launcher3/WallpaperPicker/res/values-nodpi/wallpapers.xml

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