【发布时间】：2014-11-01 20:30:11
【问题描述】：
我是 android 应用程序开发的新手。我的应用程序有问题。我正在做一个简单的“待办事项列表应用程序”。当我将我的应用程序部署到 android 手机时。第一次运行良好。当我更改设备的方向时，MyAddFragment 中的 onCreateView() 和 onActivityCreated() 可以工作多个。并且“添加按钮”在更改方向后不起作用。 ****请帮我解决这个问题。
以下是我的活动和片段类和 xml 文件。
public class MainActivity extends Activity implements Communicator{
FragmentManager man;
private ArrayAdapter<String> todoArrayAdapter;
private ArrayList<String> todoItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
man = getFragmentManager();
MyAddFragment f1 = new MyAddFragment();
MyListFragment f2 = new MyListFragment();
FragmentTransaction transaction = man.beginTransaction();
transaction.add(R.id.frameLayout1, f1, "Add");
transaction.add(R.id.frameLayout2, f2,"List");
Log.i("a", "onCreate - ADDED FRAGMENT");
if (savedInstanceState == null) {
todoItems = new ArrayList<String>();
}else {
todoItems = savedInstanceState.getStringArrayList("veri");
}
todoArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,todoItems);
f2.setListAdapter(todoArrayAdapter);
transaction.commit();
}
public void respond(String data) {
MyListFragment fb = (MyListFragment) man.findFragmentById(R.id.frameLayout2);
todoItems.add(data);
todoArrayAdapter.notifyDataSetChanged();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putStringArrayList("veri", todoItems);
}
}
public class MyAddFragment extends Fragment{
Button btnAdd;
EditText txtEdit;
Communicator comm;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_add, container,false);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
btnAdd = (Button) getActivity().findViewById(R.id.btnAdd);
txtEdit = (EditText) getActivity().findViewById(R.id.txtEdit);
comm = (Communicator) getActivity();
btnAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String newRecord = txtEdit.getText().toString();
comm.respond(newRecord);
txtEdit.setText("");
}
});
}
}
public class MyListFragment extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_list, container,false);
return view;
}
}
public interface Communicator {
public void respond(String data);
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.ceng389hw1.MainActivity" >
<FrameLayout
android:id="@+id/frameLayout1"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:layout_alignParentLeft="true"
android:background="#ab3e0f" >
</FrameLayout>
<FrameLayout
android:id="@+id/frameLayout2"
android:layout_width="fill_parent"
android:layout_height="20dp"
android:layout_alignParentBottom="true"
android:layout_below="@+id/frameLayout1"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:background="#ab3eab"
>
</FrameLayout>
</RelativeLayout>
fragment_add.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ab3e0f">
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="@string/btnStringAdd" />
<EditText
android:id="@+id/txtEdit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/btnAdd"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/btnAdd"
android:ems="10"
android:inputType="text" />
</RelativeLayout>
fragment_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ab5810" >
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
【问题讨论】：
标签： android android-layout android-fragments android-listfragment oncreate