android启动时自动设置默认浏览器

参考：http://blog.csdn.net/pediyasm/article/details/7987389
1.设置默认应用的原理
   当设置了默认应用后,本文以UC浏览器为例子,在手机/data/system/packages.xml中就会新增如下信息：

<preferred-activities>
<item name="com.UCMobile/.main.UCMobile" match="200000" set="2">
<set name="com.UCMobile/.main.UCMobile" />
<set name="com.android.browser/.BrowserActivity" />
<filter>
<action name="android.intent.action.VIEW" />
<cat name="android.intent.category.DEFAULT" />
<scheme name="http" />
</filter>
</item>
</preferred-activities>

2.实现方法。有两种方法可以实现：一种是在Provision.apk中实现，一种是在PackageManagerService.java中实现。具体代码如下：

private void addPreferredActivityForULauncher() {
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.intent.action.VIEW");
        filter.addCategory("android.intent.category.DEFAULT");
     filter.addDataScheme("http");

        ComponentName preActivity = new ComponentName("com.UCMobile", "com.UCMobile.main.UCMobile");
        ComponentName[] set = new ComponentName[] {preActivity,new ComponentName("com.android.browser", "com.android.browser.BrowserActivity")};
        mSettings.mPreferredActivities.addFilter(
                new PreferredActivity(filter, 0x200000, set, preActivity));
        mSettings.writeLPr();
    }

if(isFirstBoot()){
    addPreferredActivityForULauncher();
     }

3.通过mm命令生成services.jar，并push到手机/system/framework下。同时将uc浏览器预装进系统。恢复出厂设置即可生效。
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另外一种方法，在PackageManagerService.java添加如下代码：
在构造函数结尾添加setDefaultBrowser();

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, 0);
        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");
    }


    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));
        mSettings.writePackageRestrictionsLPr(0);
        }
    }