Android 设置默认 Launcher

当系统中有多个 Launcher 桌面时，可通过以下方式设定默认的 Launcher：

方法一：

偷懒的话，将不想要的 Launcher，如 Launcher3 的 AndroidManifest.xml 文件中的 HOME 属性去掉，只保留自己想要的 Launcher 即可，前提是我们有其他 Launcher 的源码。弊端是去掉 Home 属性后再也无法进入。

方法二：

1.编辑：

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

文件中的

public void systemReady() {}函数，在最后添加以下代码段：

// TChip ZJ Add Below for Default Launcher

if (isFirstBoot()) {

// 修改为需要设置的 package name

String examplePackageName = "com.tchip.carlauncher";

// 修改为需要设置的 launcher activity name

String exampleActivityName = "com.tchip.carlauncher.ui.activity.MainActivity";

Intent intent = new Intent(Intent.ACTION_MAIN);

intent.addCategory(Intent.CATEGORY_HOME);

fin

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al int callingUserId = UserHandle.getCallingUserId();

List<ResolveInfo> resolveInfoList = queryIntentActivities(intent,

null, PackageManager.GET_META_DATA, callingUserId);

if (resolveInfoList != null) {

int size = resolveInfoList.size();

for (int j = 0; j < size;) {

final ResolveInfo r = resolveInfoList.get(j);

if (!r.activityInfo.packageName.equals(examplePackageName)) {

resolveInfoList.remove(j);

size -= 1;

} else {

j++;

}

}

ComponentName[] set = new ComponentName[size];

ComponentName defaultLauncher = new ComponentName(

examplePackageName, exampleActivityName);

int defaultMatch = 0;

for (int i = 0; i < size; i++) {

final ResolveInfo resolveInfo = resolveInfoList.get(i);

set[i] = new ComponentName(

resolveInfo.activityInfo.packageName,

resolveInfo.activityInfo.name);

if (defaultLauncher.getClassName().equals(

resolveInfo.activityInfo.name)) {

defaultMatch = resolveInfo.match;

}

}

IntentFilter filter = new IntentFilter();

filter.addAction(Intent.ACTION_MAIN);

filter.addCategory(Intent.CATEGORY_HOME);

filter.addCategory(Intent.CATEGORY_DEFAULT);

addPreferredActivity2(filter, defaultMatch, set,

defaultLauncher);

}

}

// TChip ZJ Add Above for Default Launcher

2.添加以下函数：

/**

• TChip ZJ Add for Default Launcher

*/

public void addPreferredActivity2(IntentFilter filter, int match,

ComponentName[] set, ComponentName activity) {

Log.d("debug_default", "addPreferredActivity2 is called.");

// writer

synchronized (mPackages) {

Slog.i(TAG, "Adding preferred activity " + activity + ":");

filter.dump(new LogPrinter(Log.INFO, TAG), " ");

mSettings.editPreferredActivitiesLPw(0).addFilter(

new PreferredActivity(filter, match, set, activity, true));

scheduleWriteSettingsLocked();

}

}

3.修改 PackageManagerService.java 的函数 findPreferredActivity：

（1）对 removeMatches 进行条件判断，在 launcher 时不 remove：

if (!(intent.getAction() != null

&& intent.getAction().equals(intent.ACTION_MAIN)

&& intent.getCategories() != null && intent.getCategories()

.contains(intent.CATEGORY_HOME))) {

Slog.d(TAG, "launcher");

} else {

if (removeMatches) {

pir.removeFilter(pa);

if (DEBUG_PREFERRED) {

Slog.v(TAG, "Removing match " + pa.mPref.mComponent);

}

break;

}

}

（2）