Question

我有几个活动，我想在每个活动上添加一些整数列表换句话说，我希望myList能够添加每个活动的整数

但是当调用myList的大小时，它返回0。

头等舱：

public class BatteryActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    MyApplication hh = new MyApplication();
    hh.MyApplication1(10);}

第二课：

 public class elseActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    MyApplication hh = new MyApplication();
    hh.MyApplication1(500);}

包装类：

public class MyApplication extends Application {

List<Integer> myList = new ArrayList<Integer>();

public void MyApplication1(int hesham) {

    this.myList.add(hesham);

}

public List<Integer> MyApplication2() {

    return this.myList;
}

调用Mylist size（）;

Toast.makeText(getApplicationContext(),    String.valueOf(hh.MyApplication2().size()), Toast.LENGTH_LONG).show();

Answer 1

尝试在声明列表之前放置public修饰符

public List<Integer> myList = new ArrayList<Integer>();

使listarray可以访问所有活动

1 个答案: