android - 如何在 Activity 形式非 Activity 类中调用方法

Question

我有一个 Activity 类和一个非 Activity 类。如何从非 Activity 类调用 Activity 类中的方法

public class MainActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);

        DataClass dc = new DataClass();
        dc.show();                  
    }

    public void call(ArrayList<String> arr) {
       // Some code...
    }
}

---

public class DataClass {

    public void show(ArrayList<String> array) {
        // Here I want to send this ArrayList values into the call
        // method in activity class.

       MainActivity act = new MainActivity();
       act.call(array);                  
    }
}

Answer 1

只需在 DateClass 中创建一个回调接口(interface)即可。

public DateClass {
    public interface IDateCallback {
        void call(ArrayList<String> arr);
    }  

    private IDateCallback callerActivity;

    public DateClass(Activity activity) {  
        callerActivity = (IDateCallback)activity;  
    }
...  
}  

public void show(ArrayList<String> array) {            
    callerActivity.Call(array);  
    ...  
}

//And implements it inside your activity.

public class MainActivity extends Activity 
        implements IDateCallback {  

    public void call(ArrayList<String> arr) {

    }  
}