修改Android默认启动项launcher
方案一
根据操作流程分析code flow，两者互相糅合，理清问题的关键。从上面弹出的选择默认主界面的界面入手，通过追踪发现上述界面是一个Activity，Activity代码路径frameworks/base/core/java/com/android/internal/app/ResolverActivity.java
ResolverActivity分析
此Activity会获取系统中所有的Home app，并根据系统的设置情况显示如上界面。此类中有一个内部类ResolveListAdapter该类继承自BaseAdapter，该类是Home app选择界面的数据适配器。
ResolveListAdapter会在ResolverActivity的onCreate方法中被初始化并会传入一个ResolveInfo类型的List，ResolveListAdapter根据会传入的List初始化一个List mList ，用户的点击事件都会在ResolveListAdapter获取数据。
用户点击”ALWAYS”的事件发生在ResolverActivity的onButtonClick 方法中，此方法会获取选中的Item的position、或者获取用户上一次启动的Home app的，mAlwaysUseOption代表用户选中的是否为历史选择（如2图中的Launcher3），并调用startSelected。
| 1 2 3 4 5 6 7 8 9 | public void onButtonClick(View v) { final int id = v.getId(); startSelected(mAlwaysUseOption ? mListView.getCheckedItemPosition() : mAdapter.getFilteredPosition(), id == R.id.button_always, mAlwaysUseOption); dismiss(); } |
StartSeletced中通过ResolveListAdapter获取选择的item代表的Home app。并且finish此activity
onIntentSelected会根据传入的ResolveInfo设置默认的Home，并根据Intent跳转到相应界面，onIntentSelected的代码在这里就不列出。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | /** * 设置默认Home app并跳转，结束此Activity * @param which 用户选择的Item的position * @param always 是否设置为总是 * @param filtered 是否非历史选择 */ void startSelected(int which, boolean always, boolean filtered) { if (isFinishing()) { return; } ResolveInfo ri = mAdapter.resolveInfoForPosition(which, filtered); Intent intent = mAdapter.intentForPosition(which, filtered); //设置默认Home，并启动 onIntentSelected(ri, intent, always); finish(); } |
ResolveListAdapter的相关代码
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /** * * @param position * @param filtered * @return */ public ResolveInfo resolveInfoForPosition(int position, boolean filtered) { //mList为List return (filtered ? getItem(position) : mList.get(position)).ri; } /** * * @param position * @param filtered * @return */ public Intent intentForPosition(int position, boolean filtered) { //mList为List DisplayResolveInfo dri = filtered ? getItem(position) : mList.get(position); return intentForDisplayResolveInfo(dri); } |
解决措施
扯了半天了，分析完谷歌的原生流程，现在终于开始进行客制化的修改了。进入正题：
此Activity的onCreate方法中判断是否为第一次启动，如果是则调用startSelected方法设置默认Home app。
默认Home app的从ResolveListAdapter中获取，所以在ResolveListAdapter中添加getDefaultHomePosition(String packageName)方法，用于获取默认home app在List 中的位置，代码如下：
| 1 2 3 4 5 6 7 8 9 10 11 | public int getDefaultHomePosition(String packageName){ for (int i = 0; i < mList.size(); i++) { ResolveInfo info = mList.get(i).ri; if (DEBUG) Log.w(TAG,"getDefaultHomePosition " + info.activityInfo.packageName); if (info.activityInfo.packageName.equals(packageName)) { return i; } } return -1; } |
在ResolverActivity中添加设置默认app的方法setupDefaultLauncher()，代码如下：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | //用于记录默认home app是否设置过 private static final String DEFAULT_HOME = "persist.sys.default.home"; private void setupDefaultLauncher() { String first = ""; try{ first = SystemProperties.get(DEFAULT_HOME); }catch(Exception e){ Log.w(TAG,"exception error get DEFAULT_HOME"); } //判断默认home 是否设置过，如果获取的字符串为空代表，未设置，否则return不在进行设置 if (!TextUtils.isEmpty(first)) { return; } //使用包名获取所需设置的默认home app在ResolveListAdapter中的位置 int position = mAdapter.getDefaultHomePosition("home app包名"); //如果不存在则return if (position == -1) { if (DEBUG) Log.w(TAG,"not find default Home"); return; } //设置默认home app后，则添加记录 try{ SystemProperties.set(DEFAULT_HOME,DEFAULT_HOME); }catch(Exception e){ Log.w(TAG,"exception error set DEFAULT_HOME"); } //设置默认home app，并跳转 startSelected(position, true, true); //结束此activity dismiss(); } |
为了保证mAdapter被初始化 setupDefaultLauncher()的调用添加到ResolverActivity的onCreate函数中，代码如下：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | protected void onCreate(Bundle savedInstanceState, Intent intent, CharSequence title, int defaultTitleRes, Intent[] initialIntents, List //其他初始化代码 ............ mIntent = new Intent(intent); mAdapter = new ResolveListAdapter(this, initialIntents, rList, mLaunchedFromUid, alwaysUseOption); //其它初始化代码 ............ if (mLaunchedFromUid < 0 || UserHandle.isIsolated(mLaunchedFromUid)) { // Gulp! finish(); return; } int count = mAdapter.mList.size(); //添加的代码 setupDefaultLauncher(); //原有逻辑 //如果系统中home app大于1 if (count > 1 || (count == 1 && mAdapter.getOtherProfile() != null)) { //初始化代码 ......... //如果home app等于1则设置唯一的home app为Home } else if (count == 1) { safelyStartActivity(mAdapter.intentForPosition(0, false)); mPackageMonitor.unregister(); mRegistered = false; finish(); return; } else { setContentView(R.layout.resolver_list); final TextView empty = (TextView) findViewById(R.id.empty); empty.setVisibility(View.VISIBLE); mListView = (ListView) findViewById(R.id.resolver_list); mListView.setVisibility(View.GONE); } //其它初始化代码 .......... } |
通过以上方法即可实现设置默认home的功能
方案二【优势，可以通过长按home按键进行切换】
ActivityManagerService.java在每次启动时执行，每次都默认启动设定的launcher，当然，如果设定的launcher存在的话，设置其他的launcher为默认会无效，因为重新启动时setDefaultLauncher()会将当前默认launcher清除。只有在卸载了设定默认启动的launcher后才能设置其他launcher为默认启动.
修改AMS：
| 1 | frameworks\base\services\java\com\android\server\am\ActivityManagerService.java |
新增客制化的method
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | private void setDefaultLauncher() { // get default component String packageName = "你指定的包名";//默认launcher包名 String className = "你指定的类名";////默认launcher入口 IPackageManager pm = ActivityThread.getPackageManager(); //判断指定的launcher是否存在 if (hasApkInstalled(packageName)) { Slog.i(TAG, "defautl packageName = " + packageName + ", default className = " + className); //清除当前默认launcher ArrayList ArrayList mContext.getPackageManager().getPreferredActivities(intentList, cnList, null); IntentFilter dhIF = null; for (int i = 0; i < cnList.size(); i++) { dhIF = intentList.get(i); if (dhIF.hasAction(Intent.ACTION_MAIN) && dhIF.hasCategory(Intent.CATEGORY_HOME)) { mContext.getPackageManager().clearPackagePreferredActivities(cnList.get(i).getPackageName()); } } //获取所有launcher activity Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); List try { list = pm.queryIntentActivities(intent, intent.resolveTypeIfNeeded(mContext.getContentResolver()), PackageManager.MATCH_DEFAULT_ONLY, getCurrentUserIdLocked()); } catch (RemoteException e) { throw new RuntimeException("Package manager has died", e); } // get all components and the best match IntentFilter filter = new IntentFilter(); filter.addAction(Intent.ACTION_MAIN); filter.addCategory(Intent.CATEGORY_HOME); filter.addCategory(Intent.CATEGORY_DEFAULT); final int N = list.size(); //设置默认launcher ComponentName launcher = new ComponentName(packageName, className); ComponentName[] set = new ComponentName[N]; int defaultMatch = 0; for (int i = 0; i < N; i++) { ResolveInfo r = list.get(i); set[i] = new ComponentName(r.activityInfo.packageName, r.activityInfo.name); Slog.d(TAG, "r.activityInfo.packageName======= " + r.activityInfo.packageName); Slog.d(TAG, "r.activityInfo.name========= " + r.activityInfo.name); if (launcher.getClassName().equals(r.activityInfo.name)) { defaultMatch = r.match; } } try { pm.addPreferredActivity(filter, defaultMatch, set, launcher, getCurrentUserIdLocked()); } catch (RemoteException e) { throw new RuntimeException("Package manager has died", e); } } } private boolean hasApkInstalled(String packageName) { if (packageName == null || "".equals(packageName)) return false; android.content.pm.ApplicationInfo info = null; try { info = mContext.getPackageManager().getApplicationInfo(packageName, 0); return info != null; } catch (NameNotFoundException e) { return false; } } |
然后在ActivityManagerService类中的boolean startHomeActivityLocked()
方法第一行调用上面添加的setDefaultLauncher()
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | boolean startHomeActivityLocked() { if (mFactoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL && mTopAction == null) { // We are running in factory test mode, but unable to find // the factory test app, so just sit around displaying the // error message and don't try to start anything. return false; } ` //-------新增方法的执行位置--------------- setDefaultLauncher(); Intent intent = new Intent( mTopAction, mTopData != null ? Uri.parse(mTopData) : null); intent.setComponent(mTopComponent); if (mFactoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) { intent.addCategory(Intent.CATEGORY_HOME); } ActivityInfo aInfo = intent.resolveActivityInfo(mContext.getPackageManager(), STOCK_PM_FLAGS); if (aInfo != null) { intent.setComponent(new ComponentName( aInfo.applicationInfo.packageName, aInfo.name)); // Don't do this if the home app is currently being // instrumented. ProcessRecord app = getProcessRecordLocked(aInfo.processName, aInfo.applicationInfo.uid); if (app == null || app.instrumentationClass == null) { intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK); mMainStack.startActivityLocked(null, intent, null, null, 0, aInfo, null, null, 0, 0, 0, false, false, null); } } return true; } |
添加后的方法全部内容如上，重新编译android，烧录，开机就能够自动进入自定义的launcher
可以通过系统设置取消该launcher的默认设置，取消之后按home键会弹出launcher选择提示框frameworks\base\core\java\com\android\internal\app\ResolverActivity.java
ResolverActivity类就是选择打开方式的弹出框
顺便查看老外有没有类似的需求，在stackoverflow上面一查询还真发现有一些精彩的答案（O(∩_∩)O哈哈~，看来奸商全球通用）：
How to set default app launcher programmatically?
How to reset default launcher/home screen replacement?
更多相关文章
- android sdk 编译--如何将源代码加入android.jar，以及make原理
- [RK3288]串口开发之JNI环境搭建（基于android8.1使用android studi
- Android(安卓)Studio使用技巧系列教程（三）
- android学习轨迹之三：图片浏览+拨号程序总结
- android studio快捷键记录
- java获取系统语言（区分简体中文和繁体中文） .
- Android应用之Hybird混合开发，集成web页面的方法尝试
- Android自定义Dialog实现通用圆角对话框
- Android(安卓)使用Intent 在Activity 间跳转