我使用的片段,当我改变设备的方向。如果最初的画像,当我将其更改为横向,然后我的应用程序崩溃。我在这里添加的logcat的。我已经经过许多环节走了,但找不到正确的答案。
请帮我解决这个问题。
感谢
公共类PageViewActivity扩展FragmentActivity {
私人ViewPager viewPager;
私人NoticePageAdapter noticePageAdapter;
私人TextView的titleText;
私人诠释PageIndex的;
私有静态诠释restTime = 0;
专用长lastTime;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
的setContentView(R.layout.activity_page_view);
。getWindow()setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.window_title2);
titleText =(TextView中)findViewById(R.id.title2);
titleText.setText(R.string.app_name);
//创建将返回一个片段为三个的适配器
//应用程序的主要部分。
noticePageAdapter =新NoticePageAdapter(getSupportFragmentManager());
//设置的ViewPager与部分适配器。
viewPager =(ViewPager)findViewById(R.id.viewpager);
意向意图= getIntent();
的PageIndex = intent.getIntExtra(notice_position,0);
viewPager.setAdapter(noticePageAdapter);
viewPager.setCurrentItem(PageIndex的,真正的);
lastTime = System.currentTimeMillis的();
//检查的休息时间。如果超过30秒,然后完成活动。
新CheckTimeThread()启动();
}
/ **
* A {@link FragmentPagerAdapter}返回对应的片段
*章节/标签/页之一。
* /
类NoticePageAdapter扩展FragmentPagerAdapter {
公共NoticePageAdapter(FragmentManager FM){
超(FM);
}
@覆盖
公共片段的getItem(INT位置){
片段片段=新NoticeFragment();
捆绑的args =新包();
args.putInt(NoticeFragment.TEMPLATE_POSITION,位置+ 1);
fragment.setArguments(参数);
返回片段;
}
@覆盖
公众诠释getCount将(){
返回NoticeData.templateId.length;
}
}
/ **
*的通知片段重新presenting应用程序的通知,但只是
*显示通知
* /
公共类NoticeFragment扩展片段{
公共静态最后弦乐TEMPLATE_POSITION =template_position;
私人TextView的noticeHeaderTextView;
私人TextView的noticeContentTextView;
私人ImageView的noticeImageView;
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,捆绑savedInstanceState){
INT templatePosition = getArguments()调用getInt(TEMPLATE_POSITION)。
INT templateId = 0;
INT TempVar的;
TempVar的= templatePosition - 1;
templateId =的Integer.parseInt(NoticeData.templateId [TempVar的]);
INT RES = R.layout.first_template;
开关(templateId){
情况1:
RES = R.layout.first_template;
打破;
案例2:
RES = R.layout.second_template;
打破;
案例3:
RES = R.layout.third_template;
打破;
壳体4:
RES = R.layout.fourth_template;
打破;
默认:
打破;
}
查看rootView = inflater.inflate(RES,集装箱,假);
noticeHeaderTextView =(TextView中)rootView.findViewById(R.id.noticeHeading);
noticeHeaderTextView.setText(Html.fromHtml(NoticeData.noticeHeading [TempVar的]));
noticeContentTextView =(TextView中)rootView.findViewById(R.id.noticeContent);
noticeContentTextView.setText(Html.fromHtml(NoticeData.noticeContent [TempVar的]));
noticeImageView =(ImageView的)rootView.findViewById(R.id.noticeImageView);
UrlImageViewHelper.setUrlDrawable(noticeImageView,NoticeData.imagesURL [TempVar的]);
DisplayMetrics指标= getResources()getDisplayMetrics()。
INT宽度= metrics.widthPixels;
如果(templateId == 3){
。noticeImageView.getLayoutParams()宽度=宽度/ 2;
}
否则,如果(templateId == 2){
。noticeHeaderTextView.getLayoutParams()宽度=宽度/ 2;
。noticeContentTextView.getLayoutParams()宽度=宽度/ 2;
}
RelativeLayout的RelativeLayout的=(RelativeLayout的)rootView.findViewById(R.id.relativeLayout);
relativeLayout.setOnTouchListener(新OnTouchListener(){
@覆盖
公共布尔onTouch(视图V,MotionEvent事件){
resetRestTime();
返回false;
}
});
返回rootView;
}
}
}
错误跟踪:
06-24 18:24:36.501:E / AndroidRuntime(11863):致命异常:主要
06-24 18:24:36.501:E / AndroidRuntime(11863):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.noticeboard / com.noticeboard.PageViewActivity}:android.support.v4.app.Fragment $ InstantiationException :无法实例片段com.noticeboard.PageViewActivity $ NoticeFragment:确保类名称存在,是公开的,并且有一个空的构造是公
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3365)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread.access $ 700(ActivityThread.java:128)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1165)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.os.Handler.dispatchMessage(Handler.java:99)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.os.Looper.loop(Looper.java:137)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread.main(ActivityThread.java:4514)
06-24 18:24:36.501:E / AndroidRuntime(11863):在java.lang.reflect.Method.invokeNative(本机方法)
06-24 18:24:36.501:E / AndroidRuntime(11863):在java.lang.reflect.Method.invoke(Method.java:511)
06-24 18:24:36.501:E / AndroidRuntime(11863):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:790)
06-24 18:24:36.501:E / AndroidRuntime(11863):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
06-24 18:24:36.501:E / AndroidRuntime(11863):在dalvik.system.NativeStart.main(本机方法)
06-24 18:24:36.501:E / AndroidRuntime(11863):android.support.v4.app.Fragment $ InstantiationException:产生的原因无法实例片段com.noticeboard.PageViewActivity $ NoticeFragment:确保类名称存在,是公众,并且有一个空的构造是公
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.support.v4.app.Fragment.instantiate(Fragment.java:399)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.support.v4.app.FragmentState.instantiate(Fragment.java:97)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1760)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:200)
06-24 18:24:36.501:E / AndroidRuntime(11863):在com.noticeboard.PageViewActivity.onCreate(PageViewActivity.java:40)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.Activity.performCreate(Activity.java:4465)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
06-24 18:24:36.501:E / AndroidRuntime(11863):12 ...更多
06-24 18:24:36.501:E / AndroidRuntime(11863):java.lang.InstantiationException:产生的原因无法实例类com.noticeboard.PageViewActivity $ NoticeFragment;没有空的构造
06-24 18:24:36.501:E / AndroidRuntime(11863):在java.lang.Class.newInstanceImpl(本机方法)
06-24 18:24:36.501:E / AndroidRuntime(11863):在java.lang.Class.newInstance(Class.java:1319)
06-24 18:24:36.501:E / AndroidRuntime(11863):在android.support.v4.app.Fragment.instantiate(Fragment.java:388)
06-24 18:24:36.501:E / AndroidRuntime(11863):19 ...更多
解决方案
我做了内部类是静态的。
公共静态类NoticeFragment扩展片段{
这解决了我的问题。
I am using the Fragment and When I change the orientation of the device. If initially its portrait and when i change it to landscape then my application crash. I added the logcat here. I have gone through many links but could not find the right answer.
Please help me to solve this issue.
Thanks
public class PageViewActivity extends FragmentActivity {
private ViewPager viewPager;
private NoticePageAdapter noticePageAdapter;
private TextView titleText;
private int pageIndex;
private static int restTime = 0;
private long lastTime;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.activity_page_view);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title2);
titleText = (TextView) findViewById(R.id.title2);
titleText.setText(R.string.app_name);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
noticePageAdapter = new NoticePageAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
viewPager = (ViewPager) findViewById(R.id.viewpager);
Intent intent = getIntent();
pageIndex = intent.getIntExtra("notice_position", 0);
viewPager.setAdapter(noticePageAdapter);
viewPager.setCurrentItem(pageIndex, true);
lastTime = System.currentTimeMillis();
//Check the rest time. If it exceed the 30 sec then finish the activity.
new CheckTimeThread().start();
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
class NoticePageAdapter extends FragmentPagerAdapter {
public NoticePageAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment fragment = new NoticeFragment();
Bundle args = new Bundle();
args.putInt(NoticeFragment.TEMPLATE_POSITION, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
return NoticeData.templateId.length;
}
}
/**
* A Notice fragment representing a notices of the app, but that simply
* displays notices
*/
public class NoticeFragment extends Fragment {
public static final String TEMPLATE_POSITION = "template_position";
private TextView noticeHeaderTextView;
private TextView noticeContentTextView;
private ImageView noticeImageView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
int templatePosition = getArguments().getInt(TEMPLATE_POSITION);
int templateId = 0;
int tempVar;
tempVar = templatePosition - 1;
templateId = Integer.parseInt(NoticeData.templateId[tempVar]);
int res = R.layout.first_template;
switch (templateId) {
case 1:
res = R.layout.first_template;
break;
case 2:
res = R.layout.second_template;
break;
case 3:
res = R.layout.third_template;
break;
case 4:
res = R.layout.fourth_template;
break;
default:
break;
}
View rootView = inflater.inflate(res, container, false);
noticeHeaderTextView = (TextView)rootView.findViewById(R.id.noticeHeading);
noticeHeaderTextView.setText(Html.fromHtml(NoticeData.noticeHeading[tempVar]));
noticeContentTextView = (TextView)rootView.findViewById(R.id.noticeContent);
noticeContentTextView.setText(Html.fromHtml(NoticeData.noticeContent[tempVar]));
noticeImageView = (ImageView)rootView.findViewById(R.id.noticeImageView);
UrlImageViewHelper.setUrlDrawable(noticeImageView, NoticeData.imagesURL[tempVar]);
DisplayMetrics metrics = getResources().getDisplayMetrics();
int width = metrics.widthPixels;
if(templateId == 3) {
noticeImageView.getLayoutParams().width = width / 2;
}
else if(templateId == 2) {
noticeHeaderTextView.getLayoutParams().width = width/2;
noticeContentTextView.getLayoutParams().width = width/2;
}
RelativeLayout relativeLayout = (RelativeLayout)rootView.findViewById(R.id.relativeLayout);
relativeLayout.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
resetRestTime();
return false;
}
});
return rootView;
}
}
}
Error Trace:
06-24 18:24:36.501: E/AndroidRuntime(11863): FATAL EXCEPTION: main
06-24 18:24:36.501: E/AndroidRuntime(11863): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.noticeboard/com.noticeboard.PageViewActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.noticeboard.PageViewActivity$NoticeFragment: make sure class name exists, is public, and has an empty constructor that is public
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3365)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread.access$700(ActivityThread.java:128)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1165)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.os.Handler.dispatchMessage(Handler.java:99)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.os.Looper.loop(Looper.java:137)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread.main(ActivityThread.java:4514)
06-24 18:24:36.501: E/AndroidRuntime(11863): at java.lang.reflect.Method.invokeNative(Native Method)
06-24 18:24:36.501: E/AndroidRuntime(11863): at java.lang.reflect.Method.invoke(Method.java:511)
06-24 18:24:36.501: E/AndroidRuntime(11863): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
06-24 18:24:36.501: E/AndroidRuntime(11863): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
06-24 18:24:36.501: E/AndroidRuntime(11863): at dalvik.system.NativeStart.main(Native Method)
06-24 18:24:36.501: E/AndroidRuntime(11863): Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.noticeboard.PageViewActivity$NoticeFragment: make sure class name exists, is public, and has an empty constructor that is public
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.support.v4.app.Fragment.instantiate(Fragment.java:399)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.support.v4.app.FragmentState.instantiate(Fragment.java:97)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1760)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:200)
06-24 18:24:36.501: E/AndroidRuntime(11863): at com.noticeboard.PageViewActivity.onCreate(PageViewActivity.java:40)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.Activity.performCreate(Activity.java:4465)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
06-24 18:24:36.501: E/AndroidRuntime(11863): ... 12 more
06-24 18:24:36.501: E/AndroidRuntime(11863): Caused by: java.lang.InstantiationException: can't instantiate class com.noticeboard.PageViewActivity$NoticeFragment; no empty constructor
06-24 18:24:36.501: E/AndroidRuntime(11863): at java.lang.Class.newInstanceImpl(Native Method)
06-24 18:24:36.501: E/AndroidRuntime(11863): at java.lang.Class.newInstance(Class.java:1319)
06-24 18:24:36.501: E/AndroidRuntime(11863): at android.support.v4.app.Fragment.instantiate(Fragment.java:388)
06-24 18:24:36.501: E/AndroidRuntime(11863): ... 19 more
解决方案
I made the inner class to static.
public static class NoticeFragment extends Fragment {
It solved my problem.