设置默认Browser

　　电信A库要求android系统中有多个Browser时，开机自动设置一个默认浏览器，而不用弹出选择框让用户手动选择。

　　监听开机广播Intent.ACTION_BOOT_COMPLETED, 用PackageManager调用addPreferredActivity来设置默认Browser。因为要有系统权限才能设置成功，所以在Package/apps/Settings模块中添加代码实现。（系统通过校验发起调用PackageManager.addPreferredActivity程序的Uid来判断是否有权限）

public class BootCompletedReceiver extends BroadcastReceiver {

    private final static String PKG_NAME = "com.android.browser";
    private final static String CLASS_NAME = "com.android.browser.BrowserActivity";

    private final static String[] SCHEME = new String[] { "http", "https", "about", "javascript", };
    
    @Override
    public void onReceive(Context c, Intent paramIntent) {
        try {
            Log.d("antoon", paramIntent.getAction());
            setDefaultBrowser(c);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void setDefaultBrowser(Context c) {
        
        long start = System.currentTimeMillis();
        
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(Uri.parse("http://"));//这里如果配置 “file://” pm.queryIntentActivities得到的list为空，不知为何
        
        final int flags = PackageManager.MATCH_DEFAULT_ONLY | PackageManager.GET_RESOLVED_FILTER;

        PackageManager pm = c.getPackageManager();
        List<ResolveInfo> list = pm.queryIntentActivities(intent, flags);

        final int N = list == null ? 0 : list.size();
        if (N == 0)
            return;

        int bestmatch = 0;
        int uid = -1;
        ComponentName matchComponentName = null;
        ComponentName[] set = new ComponentName[N];

        ComponentName defaultComponentName = new ComponentName(PKG_NAME, CLASS_NAME);
        for (int i = 0; i < N; i++) {
            ResolveInfo r = list.get(i);
            ComponentName cp = new ComponentName(r.activityInfo.packageName, r.activityInfo.name);
            set[i] = cp;
            if (cp.equals(defaultComponentName)) {
                bestmatch = r.match;
                matchComponentName = cp;
                uid = r.activityInfo.applicationInfo.uid;
            }
            Log.d("antoon", i + " -- " + cp);
        }

        if (matchComponentName == null) {
            Log.d("antoon", "matchComponentName is null");
            matchComponentName = set[0];
            bestmatch = list.get(0).match;
        }

        Log.d("antoon", "bestmatch = " + bestmatch + "   matchComponentName = "
                + matchComponentName);

       // List<IntentFilter> filterList = filterList();
62         //for (IntentFilter filter : filterList) {
63            // pm.addPreferredActivity(filter, bestmatch, set, matchComponentName);//用下面的方法也可以，系统权限的校验就是根据CallingUserId来判断
64 //            pm.addPreferredActivity(filter, bestmatch, set, matchComponentName, android.os.UserHandle.getCallingUserId());
65         //}
　　　　　　 pm.addPreferredActivity(getFilterViewHttp(), bestmatch, set, matchComponentName, android.os.UserHandle.getCallingUserId());
        Log.d("antoon", "used time :" + (System.currentTimeMillis() - start)+"ms");
    }

    
　　　　　　/*没必要针对每个scheme创建filter,在一个filter中加入所有scheme就可以，与Browser中AndroidManifest.xml中的配置对应。
　　　　　　public List<IntentFilter> filterList() {
70         　　ArrayList<IntentFilter> list = new ArrayList<IntentFilter>();
71         　　for (String sche : SCHEME) {
72             　　IntentFilter filter = new IntentFilter();
73             　　filter.addAction(Intent.ACTION_VIEW);
74             　　filter.addCategory(Intent.CATEGORY_BROWSABLE);
75             　　filter.addCategory(Intent.CATEGORY_DEFAULT);
76             　　filter.addDataScheme(sche);
77             　　list.add(filter);
78         　　}
79         　　return list;
80     　　}
　　　　　　*/
　　　　

 　　　　public IntentFilter getFilterViewHttp() {
            
            IntentFilter filter = new IntentFilter();
            filter.addAction(Intent.ACTION_VIEW);
            filter.addCategory(Intent.CATEGORY_BROWSABLE);
            filter.addCategory(Intent.CATEGORY_DEFAULT);
            filter.addDataScheme("http");           
            
            return filter;
        }

}

　　　　<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

　　　　<receiver android:name=".BootCompletedReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>

看看系统Browser的配置

　　　　<activity
            android:name="BrowserActivity"
            android:alwaysRetainTaskState="true"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale"
            android:label="@string/application_name"
            android:launchMode="singleTask"
            android:theme="@style/BrowserTheme"
            android:windowSoftInputMode="adjustResize" >
            <intent-filter>
                <action android:name="android.speech.action.VOICE_SEARCH_RESULTS" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <!--
                 For these schemes were not particular MIME type has been
                 supplied, we are a good candidate.
            -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:scheme="http" />
                <data android:scheme="https" />
                <data android:scheme="about" />
                <data android:scheme="javascript" />
            </intent-filter>
            <!--
                  For these schemes where any of these particular MIME types
                  have been supplied, we are a good candidate.
            -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.BROWSABLE" />
                <category android:name="android.intent.category.DEFAULT" />

                <data android:scheme="http" />
                <data android:scheme="https" />
                <data android:scheme="inline" />
                <data android:mimeType="text/html" />
                <data android:mimeType="text/plain" />
                <data android:mimeType="application/xhtml+xml" />
                <data android:mimeType="application/vnd.wap.xhtml+xml" />
            </intent-filter>
            <!-- For viewing saved web archives. -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.BROWSABLE" />
                <category android:name="android.intent.category.DEFAULT" />

                <data android:scheme="http" />
                <data android:scheme="https" />
                <data android:scheme="file" />
                <data android:mimeType="application/x-webarchive-xml" />
            </intent-filter>
            <!-- Accept inbound NFC URLs at a low priority -->
            <intent-filter android:priority="-101" >
                <action android:name="android.nfc.action.NDEF_DISCOVERED" />

                <category android:name="android.intent.category.DEFAULT" />

                <data android:scheme="http" />
                <data android:scheme="https" />
            </intent-filter>
            <!-- We are also the main entry point of the browser. -->
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="android.intent.category.BROWSABLE" />
                <category android:name="android.intent.category.APP_BROWSER" />
            </intent-filter>
            <!--
            The maps app is a much better experience, so it's not
                 worth having this at all... especially for a demo!
            <intent-filter android:label="Map In Browser">
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.item/postal-address" />
            </intent-filter>
            -->
            <intent-filter>
                <action android:name="android.intent.action.WEB_SEARCH" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.WEB_SEARCH" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:scheme="" />
                <data android:scheme="http" />
                <data android:scheme="https" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_SEARCH" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.SEARCH" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>

            <meta-data
                android:name="android.app.searchable"
                android:resource="@xml/searchable" />
        </activity>

参考：http://www.apkbus.com/forum.php?mod=viewthread&tid=225694&page=1#pid3159981