如何从Android Activity调用Java类

Question

I have an Android activity called main.java and BPMClass.java class. I need to call the BPMClass.java within the main.java class. I wrote the code in the following way (does not show function name):

import com.app.BPMClass;
... 
public class main extends Activity {
BPMClass bpmclass;
@Override
public void onCreate(Bundle savedInstanceState) 
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    bpmclass = new BPMClass("filename");
    bpmclass.    // does not show the function name of BPMClass.
  }
}

....
BPMClass{
   String fname;
   public BPMClass(String filename){
    fname=filename
   }
  public int fun1(fname){
   int val=0;
    .......
  return val; 
 }
}

Answer 1

根据您的需要声明类的访问修饰符，如果类需要从其包级别访问，那么这应该工作正常..否则将其声明为public

Answer 2

如果BPMClass被声明为public，那么代码就可以了。

Answer 3

problem is simple if he try to place class after name of the class

   class BPMClass{
   String fname;
   public BPMClass(String filename){
    fname=filename
   }
  public int fun1(fname){
   int val=0;
    .......
  return val; 
 }
}