如何预置某个浏览器为系统默认的浏览器？

[DESCRIPTION]

当系统存在多个浏览器时，如何预置某个浏览器为系统默认的浏览器？

[SOLUTION]

以设定UC浏览器为默认浏览器为例：

设计思路：第一次开机默认选择UC浏览器来打开网页,而且用户也是可以清除该默认选择的浏览器的，如果用户清除默认的浏览器设置,那么我们也保留用户的选择,直到reset机器。

具体方法：

1.在PackageManagerService.java中的构造函数结尾添加：setDefaultBrowser();

2.setDefaultBrowser()的具体实现：

private final void setDefaultBrowser(){

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

if(!isFirstBoot()) {

Log.d("debug_default","not first boot, return");

return;

}

String str1 = "android.intent.category.DEFAULT";

String str2 = "android.intent.category.BROWSABLE";

String str3 = "android.intent.action.VIEW";

//intent filter

IntentFilter filter = new IntentFilter(str3);

filter.addCategory(str1);

filter.addCategory(str2);

filter.addDataScheme("http");

//intent

Intent intent = new Intent(str3);

intent.addCategory(str2);

intent.addCategory(str1);

Uri uri = Uri.parse("http://");

intent.setDataAndType(uri, null);

//set UC，if your want set other browser as default, modify below code, add package name and activiy name

ComponentName component = new ComponentName("com.UCMobile","com.UCMobile.main.UCMobile");

//find all browsers

List<ResolveInfo>
resolveInfoList = queryIntentActivities(intent,intent.getType(),PackageManager.GET_INTENT_FILTERS);

int size = resolveInfoList.size();

ComponentName[] arrayOfComponentName = new ComponentName[size];

//make sure the default browser in phone

boolean no_UC = true;

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

{

ActivityInfo activityInfo = resolveInfoList.get(i).activityInfo;

String packageName = activityInfo.packageName;

String className = activityInfo.name;

//if your want set other browser as default, modify below package name

if (packageName.equals("com.UCMobile")) no_UC = false;

ComponentName componentName = new ComponentName(packageName, className);

arrayOfComponentName[i] = componentName;

}

if (no_UC){

Log.d("debug_default","no uc package");

return;

}else{

Log.d("debug_default","uc package is in, set it as Preferred.");

}

//set default

addPreferredActivity2(filter,IntentFilter.MATCH_CATEGORY_SCHEME, arrayOfComponentName,component);

Log.d("debug_default","add UC to PreferredActivity");

}

3.增加addPreferredActivity2接口（还是在PackageManagerService.java中）：

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.mPreferredActivities.addFilter(

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

scheduleWriteSettingsLocked();

}

}

上面是设置UC 为默认浏览器的方法，如果要设置其他浏览器为系统默认，需要修改两个地方：

1.ComponentName component = new ComponentName("packageName ","activityName");

2.if (packageName.equals("packageName")) no_UC = false;

其它都不变。

packageName代表要设置为默认浏览器的那个browser对应的包名，activityName代表要设置为默认浏览器的那个浏览器对应的类名。

红色标注的API，在android新版本上由于支持multi-user的缘故，所以接口定义发生改变，有两处需要修改（上面红色标记的语句）：

1, 把List<ResolveInfo> resolveInfoList = queryIntentActivities(intent,intent.getType(),PackageManager.GET_INTENT_FILTERS);

修改成:

List<ResolveInfo> resolveInfoList = queryIntentActivities(intent,intent.getType(),PackageManager.GET_INTENT_FILTERS, 0);

2,把mSettings.mPreferredActivities.addFilter(

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

scheduleWriteSettingsLocked();

修改成

mSettings.editPreferredActivitiesLPw(0).addFilter(

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

mSettings.writePackageRestrictionsLPr(0);