AndroidStudio编译期间修改applicationId_android studio applicationid

1.打开这个文件“项目文件夹\app\build.gradle”，在文件的第二行加入以下代码：
 
import org.json.JSONObject
String currentDir = "${project.rootProject.projectDir}"
File jsonFile = new File(currentDir + "/app/src/main/assets/a.json")
FileInputStream fileInputStream = new FileInputStream(jsonFile)
InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream)
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(jsonFile)))
String content = ""
String temp
while ((temp = bufferedReader.readLine()) != null) {
    content += temp
}
fileInputStream.close()
inputStreamReader.close()
bufferedReader.close()
JSONObject jsonObject = new JSONObject(content)
String newPackageName = jsonObject.getString("applicationId ")
android.defaultConfig.applicationId = newPackageName
 
2.把applicationId 'com.cc.com'这一行删掉。（修改结束）