Key features of the Google Talk for Android includes:
Able to make calls over 3G or 4G data network (if your carrier supports it) or over Wi-Fi.
Simply touch the video or voice chat button to connect with the friends or family members who are in the Google Talk friends list.
Text-chats will be overlaid on the phone screen while you are on video with others.
The video will automatically pauses and audio will keep going when you need to check something else from the Home screen or apps.
Google Talk with video and voice chat has already started to delivered to Google Nexus S devices as part of the Android 2.3.4 over-the-air update. Other Android devices will have to wait until the phone manufacturers such as HTC, Samsung, Motorola, LG and etc to start offering upgrade to Android 2.3.4 for their respective phones in order to get Google Talk with video and voice call feature.
If you can’t wait for the Google Talk with video chat support to come to your phone, which may take weeks or months to arrive, a hacker named britso has managed to extract Google Talk 1.3 app with video plus voice call support from Google Nexus S Android 2.3.4 update, hack the SigninActivity.smali to comment out a line so that the app works on other devices. The app is then re-compiled and pushed as the APK file for installing into other Android mobile phones running Android 2.3 or above.
Listed below are several ways on how to instal lGoogle Talk with voice and video chat support onto your Android smartphone. Note that the hack only works on rooted Android phone.
The download links of Google Talk apk is available from xda-developers.com (registration required).
Method 1: Via ADB
1.Download either Talk_with AV.zip or Talk_with_AV_no_wifi.zip.
2.Connect the Adnroid phone to PC and run following commands on ADB console:adb remount
adb shell mv /system/app/Talk.apk /system/app/Talk.apk1
adb uninstall com.google.android.talk
adb push libtalk_jni.so /system/lib/
adb push Talk2.apk /system/app
3.Run Talk and press on your own name where you can change your own status and tick the Allow video and voice chats to enable the feature.
Method 2: Using Root Explorer
1.Download and extract Talk_with AV.zip to SC card.
2.Open Root Explorer and navigate to extracted files on SDcard.
3.Copy talk2.apk and go to /system/app.
4.Press Mount R/W at the top right and then press Paste on the bottom left.
5.Now you have both talk.apk and talk2.apk.
6.Rename Talk.apk to Talk.apk1.
7.Select and hold the other Talk2.apk and press Permissions and select:User: Read Write
And press Ok.
8.Now press and hold on Talk2.apk and press Rename.
9.And rename Talk2.apk to Talk.apk.
10.Go back to extracted files SDcard and copy libtalk_jni.so.
11.Navigate to system/lib.
12.Press Mount R/W at the top right and then press Paste on the bottom left.
13.Press and hold on libtalk_jni.so and select Permissions, and change the permissions to:User: Read Write
14.Reboot the device.
15.Open Talk and press on your own name where you can change your own status and tick the Allow video and voice chats to enable the feature.