android 修改默认Launcher

系统启动后, 会查找并运行Launcher,

有源码的情况下,可以通过修改Intent-filter中的android:priorty="N" N >=1; 一般我会设置 N=100;

没有源码的情况下, 要将第三方Launcher默认启动, 则需要在些过程做点修改.

frameworks/base/services/java/com/android/server/am/ActivityManagerService.java

    boolean startHomeActivityLocked(int userId) {        if (mHeadless) {            // Added because none of the other calls to ensureBootCompleted seem to fire            // when running headless.            ensureBootCompleted();            return false;        }        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;        }        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);        }   /** AnsonCode 2013.8.5 add Code**/try{final String specialPkg = "com.android.launcherX";mContext.getPackageManager().getApplicationEnabledSetting(specialPkg);intent.setPackage(specialPkg);}catch(Exception e){e.printStackTrace();}   /** AnsonCode End **/        ActivityInfo aInfo =            resolveActivityInfo(intent, STOCK_PM_FLAGS, userId);        if (aInfo != null) {            intent.setComponent(new ComponentName(                    aInfo.applicationInfo.packageName, aInfo.name));            // Don't do this if the home app is currently being            // instrumented.            aInfo = new ActivityInfo(aInfo);            aInfo.applicationInfo = getAppInfoForUser(aInfo.applicationInfo, userId);            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, aInfo,                        null, null, 0, 0, 0, 0, null, false, null);            }        }        return true;    }

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