Reasons for displaying "Application Not Installed" after installing the software:
1, software signature is inconsistent. This usually happens when the software is updated. For example, if you have previously installed an old version of some software, and the signature of the software you need to update is different from that of the software you previously installed, you cannot install the application.
2. The software is unsigned. This usually happens when you extract the software from the rom package or you modify it yourself without re-signing.
3. The system version required by the application is different from your mobile phone version. For example, a mobile phone software requires Android system to be above Android2.3, but your mobile phone Android system is Android2.2, and the application is not installed.
Solution:
1. If the software signatures are inconsistent, you can completely uninstall the original version and reinstall it. Settings-Applications-Manage Applications
In the management application, locate the software you want to uninstall, and then click Uninstall. Then go to the application market to download.
2. The software is unsigned and needs to be signed. Download and install zipsigner, open it and sign the required software. As shown in the figure, 1 shows that the software to be signed has been found; 2 is the place where signature software is saved; Note change signed.zip to the software name. apk。 For example, signing QQ is the mobile phone QQ.apk, which is mainly easy to find. 4 is to start signing a contract. When finished, go to the directory you set, find the software and start the installation.
3. If the system demand is insufficient, you can try to find a lower version of the software or update the mobile phone system.