Android 系统设置默认launcher

Android 项目中需要设置默认launcher,下面介绍如何设置,在ActivityManagerService的startHomeActivityLocked方法中会判断当前是否有默认launcher,如果没有的话,就会弹出选择框.下面将设置默认launcher的代码列出如下:

    private void setDefaultLauncher() {
        // get default component
        String packageName = "com.vc";//默认launcher包名
        String className = "com.vc.activity.HomeActivity";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<IntentFilter> intentList = new ArrayList<IntentFilter>();
            ArrayList<ComponentName> cnList = new ArrayList<ComponentName>();
            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<ResolveInfo> list = new ArrayList<ResolveInfo>();
            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中的startHomeActivityLocked方法第一行调用setDefaultLauncher().就可以设置成功了~

    boolean startHomeActivityLocked(int userId, String reason) {
        setDefaultLauncher();    //在这里添加方法
        if (mFactoryTest == FactoryTest.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;
        }
        Intent intent = getHomeIntent();
        ActivityInfo aInfo =
            resolveActivityInfo(intent, STOCK_PM_FLAGS, userId);
    ......

转载:https://blog.youkuaiyun.com/michael_yt/article/details/78112262