Android 如何通过主活动更新片段之间的listview内容

我有三个片段，第二个和第三个，在各自的布局中有一个listView

最初，“第二帧和第三帧”的列表视图都填充了相同的项。换句话说，最初的列表视图是 第二个片段和第三个片段包含以下内容，其中CB:is checkBox和IV:is ImageView和t:textview，SaveButton是buton

t1........CB.......IV
t2........CB.......IV
t3........CB.......IV
t4........CB.......IV
t5........CB.......IV
t6........CB.......IV
    SaveButton

我想做的是，当我在第二个片段中，并“使用复选框”从listView中选择一个项目，然后单击“保存”按钮时，我选择的项目应该从第三个片段的listView中删除

为了实现这一点，在getview（）中，我检查了第二个片段的listView中是否选中了复选框，如果选中了，则添加选中的项 加入一个列表。如getView（）所示：

第二个片段：

private void setUpListView() {
    // TODO Auto-generated method stub
    this.topicsList = new ArrayList<String>();

    for (int i = 0; i < this.topics.length; i++) {
        this.topicsList.add(topics[i]);
    }

    this.adapter = new ListViewAdapter(getActivity(), this.topicsList, ECO_FRAG_ID);
    this.listView.setAdapter(adapter);
}

private void setUpListView() {
    // TODO Auto-generated method stub
    this.topicsList = new ArrayList<String>();

    for (int i = 0; i < this.topics.length; i++) {
        this.topicsList.add(topics[i]);
    }

    this.adapter = new ListViewAdapter(getActivity(), this.topicsList, LOGGER_FRAG_ID);
    this.listView.setAdapter(adapter);
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub

    if (convertView == null) {
        LayoutInflater layoutinflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        convertView = layoutinflater.inflate(R.layout.list_items_layout, null);
    }

    if (this.checkedItemsList1 == null) {
        this.checkedItemsList1 = new ArrayList<String>();
    }

    if (this.checkedItemsList2 == null) {
        this.checkedItemsList2 = new ArrayList<String>();
    }

    final TextView tv = (TextView) convertView.findViewById(R.id.tvlist_topic);
    final CheckBox cb = (CheckBox) convertView.findViewById(R.id.cbList_hook);
    final ImageView iv = (ImageView) convertView.findViewById(R.id.ivList_delete);

    tv.setText(this.topicsList.get(position));

    if (cb.isChecked() && (this.id == 1) ) {
        this.checkedItemsList1.add(this.topicsList.get(position));
        this.setCheckedItemsList1(this.checkedItemsList1);
    }
    if (cb.isChecked() && (this.id == 2) ) {
        this.checkedItemsList2.add(this.topicsList.get(position));
        this.setCheckedItemsList2(this.checkedItemsList2);
    }

    iv.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (cb.isChecked())
                cb.setChecked(false);

            topicsList.remove(position);
            notifyDataSetChanged();
        }
    });

    return convertView;
}

在这个界面上，main活动实现了它，在接口的实现中，我将选中项的列表从第二个片段传递到第三个片段 通过第三个fragmet中的公共方法进行分段，该方法更新列表，然后将列表分配给适配器，如下所示：

@Override
public void onCheckedStateChanged(ArrayList<String> list, int id) {
    // TODO Auto-generated method stub

    switch (id) {
    case 1:
        ((Logger_Settings_Frag) this.fragList.get(2)).updateTopicList(list);
        break;
    case 2:

        break;
    }
}

**updateTopicList in the third fragment**

public void updateTopicList(ArrayList<String> list) {
    for (String str : list) {
        this.topicsList.remove(str);
    }

    this.adapter = new ListViewAdapter(getActivity(), this.topicsList, LOGGER_FRAG_ID);
    this.listView.setAdapter(adapter);
}

@覆盖
已更改CheckedStateChanged（ArrayList列表，int id）时的公共无效{
//TODO自动生成的方法存根
开关（id）{
案例1：
（（Logger_Settings_Frag）this.fragList.get（2））.updateTopicList（list）；
打破
案例2：
打破
}
}
**第三个片段中的updateTopicList**
公共void updateTopicList（ArrayList列表）{
for（字符串str:list）{
此.topicsList.remove（str）；
}
this.adapter=new ListViewAdapter（getActivity（），this.topicsList，LOGGER\u FRAG\u ID）；
this.listView.setAdapter（适配器）；
}

第三个片段中的updateTopicList

public void updateTopicList(ArrayList<String> list) {
    for (String str : list) {
        this.topicsList.remove(str);
    }

    this.adapter = new ListViewAdapter(getActivity(), this.topicsList, LOGGER_FRAG_ID);
    this.listView.setAdapter(adapter);
}

public void updateTopicList（ArrayList列表）{
for（字符串str:list）{
此.topicsList.remove（str）；
}
this.adapter=new ListViewAdapter（getActivity（），this.topicsList，LOGGER\u FRAG\u ID）；
this.listView.setAdapter（适配器）；
}

当我运行该代码时，在第二个片段的saveButton侦听器中，log.d消息显示应该包含已检查项的列表的大小为零

---

请看一下代码，让我知道我缺少了什么？

试试看：这是一个带有两个片段的Project OneActivity示例： 公共阵列列表myBeansList_frgnt1； 公共阵列列表myBeansList_frgnt2； 单击“保存”按钮，迭代myBeansList\u frgnt1并检查是否选择了任何项目。如果选择了项目，我会将该项目添加到myBeansList\u frgnt2。显示在fragment2中

主要活动：

public class MainActivity extends FragmentActivity {
private FragmentManager mFragmentManager;
private MyFragment1 myFragment1;
public ArrayList<MyBean> myBeansList_frgnt1;
public ArrayList<MyBean> myBeansList_frgnt2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mFragmentManager = getSupportFragmentManager();
    myBeansList_frgnt1 = new ArrayList<MyBean>();
    myBeansList_frgnt2 = new ArrayList<MyBean>();

}

@Override
protected void onResume() {
    super.onResume();
    myFragment1 = new MyFragment1();
    FragmentTransaction mTransaction = mFragmentManager.beginTransaction();
    mTransaction.replace(R.id.framid, myFragment1, "applock").commit();
}

片段1：

public class MyFragment1 extends Fragment {
private ListView mListView;
private MyBaseAdpter myBaseAdpter;
private Button mButton;

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_layout, null);
    mListView = (ListView) view.findViewById(R.id.listviewid);
    mButton = (Button) view.findViewById(R.id.bttnid);
    return view;
}

@Override
public void onResume() {
    super.onResume();
    final MainActivity mActivity = (MainActivity) getActivity();
    myBaseAdpter = new MyBaseAdpter(mActivity.myBeansList_frgnt1, getActivity());
    mListView.setAdapter(myBaseAdpter);
    mButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            int size = mActivity.myBeansList_frgnt1.size();
            for (int i = 0; i < size; i++) {
                MyBean mMyBean = mActivity.myBeansList_frgnt1.get(i);
                if (mMyBean.isChecked()) {
                    mActivity.myBeansList_frgnt2.add(mMyBean);
                }
            }
        }
    });
}

}

MyBean：

public class MyBean {
private String mName;
private int mImgId;
private boolean isChecked;

public String getmName() {
    return mName;
}

public void setmName(String mName) {
    this.mName = mName;
}

public int getmImgId() {
    return mImgId;
}

public void setmImgId(int mImgId) {
    this.mImgId = mImgId;
}

public boolean isChecked() {
    return isChecked;
}

public void setChecked(boolean isChecked) {
    this.isChecked = isChecked;
}

public MyBean() {
    super();
    // TODO Auto-generated constructor stub
}

---

}

单击“保存”按钮后，您希望从第三个片段中删除项目，那么在第二个片段中，您希望删除的选定项目是什么呢？No，id o不希望删除它们。应保留第二个片段中已查看的片段，并将其从第三个片段的列表视图中删除。问题是，在第二个片段中的savebutton侦听器中，表示包含选定项的列表的大小为零。您能告诉我如何按位置引用getView（）中的项吗？我的意思是如何知道当前选中复选框的位置？等等。。。我会告诉你的

public class MyFragment1 extends Fragment {
private ListView mListView;
private MyBaseAdpter myBaseAdpter;
private Button mButton;

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_layout, null);
    mListView = (ListView) view.findViewById(R.id.listviewid);
    mButton = (Button) view.findViewById(R.id.bttnid);
    return view;
}

@Override
public void onResume() {
    super.onResume();
    final MainActivity mActivity = (MainActivity) getActivity();
    myBaseAdpter = new MyBaseAdpter(mActivity.myBeansList_frgnt1, getActivity());
    mListView.setAdapter(myBaseAdpter);
    mButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            int size = mActivity.myBeansList_frgnt1.size();
            for (int i = 0; i < size; i++) {
                MyBean mMyBean = mActivity.myBeansList_frgnt1.get(i);
                if (mMyBean.isChecked()) {
                    mActivity.myBeansList_frgnt2.add(mMyBean);
                }
            }
        }
    });
}

public class MyFragment2 extends Fragment {
private ListView mListView;
private MyBaseAdpter myBaseAdpter;

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_layout, null);
    mListView = (ListView) view.findViewById(R.id.listviewid);
    return view;
}

@Override
public void onResume() {
    super.onResume();
    MainActivity mActivity = (MainActivity) getActivity();
    myBaseAdpter = new MyBaseAdpter(mActivity.myBeansList_frgnt2, getActivity());
    mListView.setAdapter(myBaseAdpter);
}

public class MyBean {
private String mName;
private int mImgId;
private boolean isChecked;

public String getmName() {
    return mName;
}

public void setmName(String mName) {
    this.mName = mName;
}

public int getmImgId() {
    return mImgId;
}

public void setmImgId(int mImgId) {
    this.mImgId = mImgId;
}

public boolean isChecked() {
    return isChecked;
}

public void setChecked(boolean isChecked) {
    this.isChecked = isChecked;
}

public MyBean() {
    super();
    // TODO Auto-generated constructor stub
}