android 原生launcher界面,Android framework 使用自定的activity取代默认的Launcher界面

背景：需要实现使用自定的activity取代默认的Launcher界面

a. 开机启动后进入自定义的activity

b. 按home键跳转到自定义的activity

1.先看一下launcher的流程

image

boolean startHomeActivityLocked(int userId, String reason) {

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);

if (aInfo != null) {

intent.setComponent(new ComponentName(aInfo.applicationInfo.packageName, aInfo.name));

// Don't do this if the home app is currently be