【Launcher2源码解读】Launcher中的自定义控件
本文对Launcher2进行一个全面的了解,介绍Launcher2中的自定义控件
如图:
launcher.xml
<?xml version="1.0" encoding="utf-8"?> <com.callmewill.launcher2.DragLayer xmlns:android="http://schemas.android.com/apk/res/android" xmlns:launcher="http://schemas.android.com/apk/res/com.callmewill.launcher2" android:id="@+id/drag_layer" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/workspace_bg" > //最外层的自定义布局继承FrameLayout,主要功能手指拖动时生成一个悬浮的view,以及各种位值计算 <include android:id="@+id/dock_divider" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:layout_marginBottom="@dimen/button_bar_height" layout="@layout/workspace_divider" /> //底部指示器的背景 <include android:id="@+id/paged_view_indicator" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom" android:layout_marginBottom="@dimen/button_bar_height" layout="@layout/scroll_indicator" /> //底部指示器 <!-- The workspace contains 5 screens of cells --> <com.callmewill.launcher2.Workspace //继承PagedView,SmoothPagedView,实现一个ViewGroup内部有多个View并且左右滑动 android:id="@+id/workspace" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/workspace_bottom_padding" android:paddingLeft="@dimen/workspace_left_padding" android:paddingRight="@dimen/workspace_right_padding" android:paddingTop="@dimen/workspace_top_padding" launcher:cellCountX="@integer/cell_count_x" launcher:cellCountY="@integer/cell_count_y" launcher:defaultScreen="2" launcher:pageSpacing="@dimen/workspace_page_spacing" launcher:scrollIndicatorPaddingLeft="@dimen/workspace_divider_padding_left" launcher:scrollIndicatorPaddingRight="@dimen/workspace_divider_padding_right" > <include android:id="@+id/cell1" layout="@layout/workspace_screen" /> //内部的子View,主要类是CellLayout,CellLayout是一个网格的自定义ViewGroup,用来装各种item <include android:id="@+id/cell2" layout="@layout/workspace_screen" /> <include android:id="@+id/cell3" layout="@layout/workspace_screen" /> <include android:id="@+id/cell4" layout="@layout/workspace_screen" /> <include android:id="@+id/cell5" layout="@layout/workspace_screen" /> </com.callmewill.launcher2.Workspace> <include //底部的Dock栏 android:id="@+id/hotseat" android:layout_width="match_parent" android:layout_height="@dimen/button_bar_height_plus_padding" android:layout_gravity="bottom" layout="@layout/hotseat" /> <include android:id="@+id/qsb_bar" //顶部的搜索和移目标控件 layout="@layout/qsb_bar" /> <com.callmewill.launcher2.DrawableStateProxyView //app抽屉,同样继承PagedView android:id="@+id/voice_button_proxy" android:layout_width="80dp" android:layout_height="@dimen/qsb_bar_height" android:layout_gravity="top|right" android:clickable="true" android:onClick="onClickVoiceButton" launcher:sourceViewId="@+id/voice_button" /> <include android:id="@+id/apps_customize_pane" //app抽屉,同样继承PagedView android:layout_width="match_parent" android:layout_height="match_parent" layout="@layout/apps_customize_pane" android:visibility="invisible" /> <include android:id="@+id/workspace_cling" //用户引导 android:layout_width="match_parent" android:layout_height="match_parent" layout="@layout/workspace_cling" android:visibility="gone" /> <include android:id="@+id/folder_cling" //用户引导 android:layout_width="match_parent" android:layout_height="match_parent" layout="@layout/folder_cling" android:visibility="gone" /> </com.callmewill.launcher2.DragLayer>
从上往下说吧
搜索条:点击搜索条时调用的系统本身的SearchManager来完成相关逻辑,Launcher.java 中的startGlobleSearch方法:
public void startGlobalSearch(String initialQuery, boolean selectInitialQuery, Bundle appSearchData, Rect sourceBounds) { final SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE); ComponentName globalSearchActivity = searchManager.getGlobalSearchActivity(); if (globalSearchActivity == null) { Log.w(TAG, "No global search activity found."); return; } Intent intent = new Intent(SearchManager.INTENT_ACTION_GLOBAL_SEARCH); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setComponent(globalSearchActivity); // Make sure that we have a Bundle to put source in if (appSearchData == null) { appSearchData = new Bundle(); } else { appSearchData = new Bundle(appSearchData); } // Set source to package name of app that starts global search, if not // set already. if (!appSearchData.containsKey("source")) { appSearchData.putString("source", getPackageName()); } intent.putExtra(SearchManager.APP_DATA, appSearchData); if (!TextUtils.isEmpty(initialQuery)) { intent.putExtra(SearchManager.QUERY, initialQuery); } if (selectInitialQuery) { intent.putExtra(SearchManager.EXTRA_SELECT_QUERY, selectInitialQuery); } intent.setSourceBounds(sourceBounds); try { startActivity(intent); } catch (ActivityNotFoundException ex) { Log.e(TAG, "Global search activity not found: " + globalSearchActivity); } }
DragLayer.java
——FrameLayout
Workspace.java 手指滑动,在多个屏幕之间切换
——ViewGroup
——PagedView 内部View跟随手指滑动
——SmoothPagedView 处理滑动时的速度
——Workspace 完成内容的展示
CellLayout.java 在Workspace中,和Hotseat中,是一个网格状的控件,可以设置行列,span,用来显示app,widget,shortcut,folder等
——ViewGroup
AppCustomsizeTabHost.java
——TabHos t抽屉内部的Tab标签
AppCustomsizePagedView
——ViewGroup
——PagedView
——DragItemPagedVIew 手提内拖拽app到Workspace
Folder.java 展示文件夹内部内容的View,内部包含一个CellLayout
——LinearLayout
FolderIcon.java 文件夹缩略图
——LinearLayout
BubbleTextView.java 用来显示app,shortcut
——TextView
textView.setCompoundDrawablesWithIntrinsicBounds(left,top,right,bottom)给TextView设置上下左右四个图片
PagedViewIcon.java 抽屉内部显示icon
——TextView
—— FrameLayout
PagedViewWidget.java 抽屉内部显示Widget
——LinearLayout
AppWidgetResizeFrame.java 重置Widget大小时的指示框
——FrameLayout
LauncherAppWidgetHost.java 显示加载Widget有关
——AppWidgetHost
每个控件的代码量都很大,看起来也费时费力。