First, the correct export apk file, need to install JDK,SDK, it is recommended to install the JDK, and then install the SDK
Second, for the environment configuration, we recommend that you configure the JDK first, the environment variables, "Properties", "Computer", "Advanced system Settings"
Add the Java_home variable, save the JDK path, add the CLASSPATH variable, save the JDK's class file.; %java_home%/bin ", add"%java_home%/bin "under the path variable so that the JDK basic configuration is complete and you can use" cmd->java-version "to see if the JDK installation was successful. If a message is displayed, it succeeds.
About the SDK, after the JDK installation is complete, install the SDK, environment variables can not be configured, directly modify Unity->performance, add SDK path, do not need to update the SDK other version also can.
Third, change Unity Playersetting, company and product name must be modified, export file can.
Summary of issues:
1 encountered a system error, a bunch of path errors, and so on, you may need to install the JDK before installing the SDK,
2 Unable to open SDK Manager, you may need to delete the Java file under System32.
About the Unity Android development Environment Configuration _WIN7 Environment