Android 活动变量传递不起作用

我试图传递一个变量“name”，它是一个字符串，从一个活动传递到另一个活动，但由于某种原因，当我从intent获得它时，它为null，intent部分的代码如下，从List_活动传递到OpenList活动

列出你的活动类别

@Override
protected void onListItemClick(ListView l, View v, int pos, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, pos, id);
    Intent intent = new Intent(this, OpenList.class);
    intent.putExtra("name", ListNames[pos]);
    System.out.println("Passing " + ListNames[pos] + " as listname");
    startActivity(new Intent(this, OpenList.class));
}

OpenList.class

//gets list name
    Bundle extras = getIntent().getExtras();
    if (extras != null) {
        name = extras.getString("name");
        System.out.println(name+ " has been passed as the name");
    }else{
        System.out.println("Return is null");
    }

它总是返回“returnisnull”

试试这个

改变这个

@Override
protected void onListItemClick(ListView l, View v, int pos, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, pos, id);
    Intent intent = new Intent(this, OpenList.class);
    intent.putExtra("name", ListNames[pos]);
    System.out.println("Passing " + ListNames[pos] + " as listname");
    startActivity(new Intent(this, OpenList.class));                // correction here
}

到

这意味着这

startActivity（新的意图（这个，OpenList.class））至
起始触觉（意图）

那么您就不会发送
包了
，所以请按下面的方式发送

Intent intent = getIntent();
if (intent != null) {
    name = intent.getStringExtra("name");
    System.out.println(name+ " has been passed as the name");
}else{
    System.out.println("Return is null");
}

Intent intent = getIntent();
if (intent != null) {
    name = intent.getStringExtra("name");
    System.out.println(name+ " has been passed as the name");
}else{
    System.out.println("Return is null");
}