1. After many people open APP2SD on Android 2.2, if the installation program crashes or encounters other situations, when they install the program again, they will be prompted with "Application not installed", thus the installation program fails.
Solution: Connect to the computer in storage mode and find the directory in the SD card. android_secure folder, there should be a smdl2tmp1 in it. asec, or it may be another name. In short, if the file is obviously different from the normal program naming format, delete it and install the software again to see if it is better.
Second, open Settings - Manage Applications -
When using the system's built-in program management to view the programs on the SD card, some programs do not have colored icons. It turns out that these software without icons are causing trouble. These software without icons are previously incorrectly installed or incompletely uninstalled software data. If you install it again, an error will be reported. Now we use the system's built-in software management to uninstall them cleanly, and there will be no errors when installing the software again.
Third, there are some software signatures that have changed, so the installation cannot be overwritten. Just delete and reinstall the new version.
