当系统存在多个launcher时，若没有设置默认launcher，开机启动后会弹出提示框，罗列所有launcher，用户选择并设置了默认launcher后，按home键以及以后重启都会进入默认的launcher。

现在，我希望系统能直接就进入我设定的launcher而不是弹出框后选择然后设置

网上大部分的做法就是修改

packages/apps/Provision/src/com/android/DefaultActivity.java

和

frameworks/base/services/java/com/android/server/pm/PackageManagerService.java

两个文件，给个相对比较好看一点的链接

我按照这个做不能达到预期的效果，

/添加内容

后期修改包名，发现开机自启动出现问题，然后弄了两天，终于差不多弄清楚了。果然，欠下的债迟早得还！

其实修改DefaultActivity.java就能够完成开机自启动，只是当时我的程序有问题，所以没有达到预期效果

当然下面修改ActivityManagerService.java也能完成开机自启动

这两者的区别在于
DefaultActivity.java只是在第一次启动时执行，如果修改了默认launcher后不可恢复

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.

//

修改多次搜索关键字，得到另一篇文章，大致看了下，感觉不会有效，但是已经绝望了就试了试，竟然解决了问题

这篇文章有借鉴之处，直接使用时会发现有些字段是上下文中没有的，故写下此文记录一下。

修改文件

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

添加一个方法：

private void setDefaultLauncher() {

// get default component
String packageName = "com.coship.factorytest";//默认launcher包名
String className = "com.coship.factorytest.MainActivity";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);
}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();
Slog.d(TAG, "N:::::hyhyhyhy:::: = " + N);

//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:::::hyhyhyhy:::: = " + r.activityInfo.packageName);
Slog.d(TAG, "r.activityInfo.name:::::hyhyhyhy:::: = " + r.activityInfo.name);
if(launcher.getClassName().equals(r.activityInfo.name)) {
defaultMatch = r.match;
}
}

try {

pm.addPreferredActivity(filter, defaultMatch, set, launcher);
} catch (RemoteException e) {
throw new RuntimeException("com.coship.factorytest.MainActivity : Package manager has died", e);
}

}//end if

}

private static boolean hasApkInstalled(String pkgname) {

try {

mSelf.mContext.getPackageManager().getPackageInfo(pkgname,0);
} catch(Exception e) {
Slog.d(TAG, "PackageManager.NameNotFoundException: = " + e.getMessage());
return false;
}
return true;
}

然后在ActivityManagerService类中的

boolean startHomeActivityLocked()

方法第一行调用上面添加的

setDefaultLauncher()

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;
}

///
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