Android开发五:接口应用

public class Helper {
 
	public static IMainListener mainActivity; 
}

public interface IMainListener {

    void xxx();
}

public class MainActivity extends ActivityGroup implements IMainListener{

     @Override
    public void onCreate(Bundle savedInstanceState) {
        
    	super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Helper.mainActivity = this;
   }
}

//调用
public class Material extends Activity{

	
        IMainListener listener;
	Button btnMaterialGoBack;
	
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.material);
        
        listener = Helper.mainActivity;
        
        btnMaterialGoBack = (Button)findViewById(R.id.btnMaterialtManagerBack);
        btnMaterialGoBack.setOnClickListener(new OnClickListener(){
        	public void onClick(View v){
        		listener.xxx();
        	}
        });
	}
	
}