TA的每日心情 | 郁闷 2022-8-29 14:43 |
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签到天数: 1 天 连续签到: 1 天 [LV.1]测试小兵
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2#
楼主 |
发表于 2018-4-18 13:30:06
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主界面代码(己做注释):
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package com.xuzhi.fragment;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;
public class FragmentDemoActivity extends Activity {
public static String[] array = { "text1,", "text2", "text3", "text4",
"text5,", "text6", "text7", "text8" };
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public static class TitlesFragment extends ListFragment {
boolean mDualPane;
int mCurCheckPosition = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
System.out.println("Fragment-->onCreate");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
System.out.println("Fragment-->onCreateView");
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
System.out.println("Fragment-->onPause");
}
@Override
public void onStop() {
// TODO Auto-generated method stub
super.onStop();
System.out.println("Fragment-->onStop");
}
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
System.out.println("Fragment-->onAttach");
}
@Override
public void onStart() {
// TODO Auto-generated method stub
super.onStart();
System.out.println("Fragment-->onStart");
}
@Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
System.out.println("Fragment-->onResume");
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
System.out.println("Fragment-->onDestroy");
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
System.out.println("Fragment-->onActivityCreted");
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, array));
View detailsFrame = getActivity().findViewById(R.id.details);
mDualPane = detailsFrame != null
&& detailsFrame.getVisibility() == View.VISIBLE;
if (savedInstanceState != null) {
mCurCheckPosition = savedInstanceState.getInt("curChoice", 0); //从保存的状态中取出数据
}
if (mDualPane) {
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
showDetails(mCurCheckPosition);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
outState.putInt("curChoice", mCurCheckPosition);//保存当前的下标
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
showDetails(position);
}
void showDetails(int index) {
mCurCheckPosition = index;
if (mDualPane) {
getListView().setItemChecked(index, true);
DetailsFragment details = (DetailsFragment) getFragmentManager()
.findFragmentById(R.id.details);
if (details == null || details.getShownIndex() != index) {
details = DetailsFragment.newInstance(mCurCheckPosition);
//得到一个fragment 事务(类似sqlite的操作)
FragmentTransaction ft = getFragmentManager()
.beginTransaction();
ft.replace(R.id.details, details);//将得到的fragment 替换当前的viewGroup内容,add则不替换会依次累加
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);//设置动画效果
ft.commit();//提交
}
} else {
new AlertDialog.Builder(getActivity()).setTitle(
android.R.string.dialog_alert_title).setMessage(
array[index]).setPositiveButton(android.R.string.ok,
null).show();
}
}
}
/**
* 作为界面的一部分,为fragment 提供一个layout
* @author terry
*
*/
public static class DetailsFragment extends Fragment {
public static DetailsFragment newInstance(int index) {
DetailsFragment details = new DetailsFragment();
Bundle args = new Bundle();
args.putInt("index", index);
details.setArguments(args);
return details;
}
public int getShownIndex() {
return getArguments().getInt("index", 0);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
if (container == null)
return null;
ScrollView scroller = new ScrollView(getActivity());
TextView text = new TextView(getActivity());
int padding = (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 4, getActivity()
.getResources().getDisplayMetrics());
text.setPadding(padding, padding, padding, padding);
scroller.addView(text);
text.setText(array[getShownIndex()]);
return scroller;
}
}
}
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注意:
如果你想在Fragment 里面创建menu,则必须在onCreate的时候设置让它可以存在optionMenu才可以创建,
代码为:
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public static class DetailsFragment extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
}
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之后的操作即可以像平常Android的menu用法一样,代码为:
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@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu, inflater);
menu.add("Menu 1a").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
menu.add("Menu 1b").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(), "index is"+getShownIndex()+" && menu text is "+item.getTitle(), 1000).show();
return super.onOptionsItemSelected(item);
}
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