[Android Application Development]-(23) Android SIP support

1. What is sip?

Step-by-Step sip

Ii. How to Use sip in Android?

Sipdroid, Demo: Android-SDK-Windows \ samples \ Android-9 \ sipdemo

3. Does the system support sip?

Android provides the SIP function since 2.3. The SIP-related APIs are stored in the directory frameworks/base/VoIP/Java/Android/NET/SIP and are included in the android.net. Sip package. Here is the whole process of solving the problem that does not support sip. It depends on the result of directly moving to the end of the article.

You must obtain the sipmanager instance before the SIP Operation:

SipManager.newInstance(Context);

Here, it is found that the Instance obtained by some devices is null. Find the newinstance method in sipmanager. java.

　　　  　　　    /**　　　     * Creates a manager instance. Returns null if SIP API is not supported.　　　     *　　　     * @param context application context for creating the manager object　　　     * @return the manager instance or null if SIP API is not supported　　　     */　　　    public static SipManager newInstance(Context context) {　　　        return (isApiSupported(context) ? new SipManager(context) : null);　　　    }　　　 　　　    /**　　　     * Returns true if the SIP API is supported by the system.　　　     */　　　    public static boolean isApiSupported(Context context) {　　　        return context.getPackageManager().hasSystemFeature(　　　                PackageManager.FEATURE_SIP);　　　    }

Through debugging, hassystemfeature is found to be empty. Go on to view the hassystemfeature method in packagemanager. Java, Which is abstract.

　　　   /**　　　     * Check whether the given feature name is one of the available　　　     * features as returned by {@link #getSystemAvailableFeatures()}.　　　     *　　　     * @return Returns true if the devices supports the feature, else　　　     * false.　　　     */　　　    public abstract boolean hasSystemFeature(String name);

This method is implemented in services/Java/COM/Android/Server/PM/packagemanagerservice. java.

 public boolean hasSystemFeature(String name) {        synchronized (mPackages) {            return mAvailableFeatures.containsKey(name);        }    }

Packagemanager. feature_sip is not found in member mavailablefeatures, and flase is returned. Therefore, the sipmanager object cannot be created. In the packagemanagerservice class, the value of the member variable mavailablefeatures is set by reading the XML file in/system/permissions. By searching for the constant packagemanager. feature_sip, you can easily find two XML files related to the SIP, under the frameworks/base/data/etc/directory. Based on past experience, these two files exist, but they are not in the/system/permissions directory. It must have not been copied.

Continue searching and find in the vending. mk file under the Device directory. Copy two sip-related files under frameworks/base/data/etc/to make.

　　　PRODUCT_COPY_FILES += \　　　    device/amlogic/g04ref/tablet_core_hardware.xml:system/etc/permissions/tablet_core_hardware.xml \　　　    frameworks/base/data/etc/android.hardware.camera.front.xml:system/etc/permissions/android.hardware.camera.front.xml \　　　    ...　　　    frameworks/base/data/etc/android.software.sip.voip.xml:system/etc/permissions/android.software.sip.voip.xml \　　　    frameworks/base/data/etc/android.software.sip.xml:system/etc/permissions/android.software.sip.xml

If you do not compile the system, you can directly copy the two files to the/system/permissions directory.

Original article, reproduced please indicate the source: http://blog.csdn.net/tangcheng_ OK