私はアンドロイドが初めてで、アイテムの選択中にeditTextを表示しようとしていますが、コードは問題ないようですが、アプリケーションを実行してそのアクティビティにアクセスするボタンをクリックすると、エミュレーターが動作しなくなります。これが私のコードです:
import java.util.Locale;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class ManageActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_manage);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.manage, menu);
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a NewCaseFragment (defined as a static inner class
// below) with the page number as its lone argument.
if(position == 0){
Fragment fragment = new NewCaseFragment();
//Bundle args = new Bundle();
//args.putInt(NewCaseFragment.ARG_SECTION_NUMBER, position + 1);
//fragment.setArguments(args);
return fragment;
}
else{
Fragment fragment = new UpdateFragment();
return fragment;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
/**
* A fragment representing a section of the app
*/
public static class NewCaseFragment extends Fragment implements OnItemSelectedListener{
public NewCaseFragment() {
}
Button members ;
EditText orgname , orgaddress;
//Spinner spinner1;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.newcase,
container, false);
Button members = (Button)getActivity(). findViewById(R.id.members);
EditText orgname = (EditText)getActivity(). findViewById(R.id.orgname);
EditText orgaddress = (EditText)getActivity(). findViewById(R.id.orgaddress);
Spinner spinner1 = (Spinner)getActivity(). findViewById(R.id.spinner1);
spinner1.setOnItemSelectedListener(this);
//members.setOnClickListener(membersListener);
return rootView;
}
public void onItemSelected(AdapterView<?> spinner1, View view,int pos, long id)
{
orgname.setVisibility(View.VISIBLE);
orgaddress.setVisibility(View.VISIBLE);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
/*******
*
*/
public static class UpdateFragment extends Fragment {
public UpdateFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.updatecase,
container, false);
return rootView;
}
}
}
レイアウト ：
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scroller"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.01"
android:orientation="horizontal"
android:padding="10dp" >
<EditText
android:id="@+id/casename"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:ems="10"
android:hint="@string/casename"
android:inputType="text"
android:textSize="12sp" >
<requestFocus />
</EditText>
</LinearLayout>
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="@array/organisation"
android:prompt="@string/infoorg" />
<!-- layout for organisation information -->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.01"
android:orientation="horizontal"
android:padding="10dp" >
<EditText
android:id="@+id/orgname"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:hint="@string/orgname"
android:inputType="text"
android:textSize="12sp"
android:visibility="gone"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.01"
android:orientation="horizontal"
android:padding="10dp" >
<EditText
android:id="@+id/orgaddress"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:hint="@string/orgaddress"
android:inputType="text"
android:textSize="12sp"
android:visibility="gone"
/>
</LinearLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.01"
android:orientation="horizontal"
android:padding="10dp" >
<TextView
android:id="@+id/staff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:clickable="true"
android:hint="@string/staff"
android:textSize="14sp"
android:layout_margin="10dp"
android:textStyle="bold" />
<Button
android:id="@+id/members"
style="@style/btnStyleGrey"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="@drawable/users2"
android:text="@string/plus"
android:layout_toRightOf="@+id/staff"
/>
</RelativeLayout>
<Button
android:id="@+id/submit"
style="@style/btnStyleBlue"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="@string/submit" />
</LinearLayout>
</ScrollView>
ログは次のとおりです。
05-09 18:01:44.684: E/AndroidRuntime(1480): FATAL EXCEPTION: main
05-09 18:01:44.684: E/AndroidRuntime(1480): java.lang.NullPointerException
05-09 18:01:44.684: E/AndroidRuntime(1480): at com.pfe.risu.ManageActivity$NewCaseFragment.onCreateView(ManageActivity.java:195)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1374)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.View.measure(View.java:12603)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.View.measure(View.java:12603)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.View.measure(View.java:12603)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
05-09 18:01:44.684: E/AndroidRuntime(1480): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.View.measure(View.java:12603)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1044)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.os.Handler.dispatchMessage(Handler.java:99)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.os.Looper.loop(Looper.java:137)
05-09 18:01:44.684: E/AndroidRuntime(1480): at android.app.ActivityThread.main(ActivityThread.java:4340)
05-09 18:01:44.684: E/AndroidRuntime(1480): at java.lang.reflect.Method.invokeNative(Native Method)
05-09 18:01:44.684: E/AndroidRuntime(1480): at java.lang.reflect.Method.invoke(Method.java:511)
05-09 18:01:44.684: E/AndroidRuntime(1480): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-09 18:01:44.684: E/AndroidRuntime(1480): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-09 18:01:44.684: E/AndroidRuntime(1480): at dalvik.system.NativeStart.main(Native Method)
2番目の問題を解決するには：
今、私はこれらの行でヌルポインタ例外を取得します:
orgname.setVisibility(View.VISIBLE);
orgaddress.setVisibility(View.VISIBLE);
II は、onItemSelected メソッド内で変数を初期化しました。
public void onItemSelected(AdapterView<?> spinner1, View view,int pos, long id)
{
EditText orgname = (EditText)getActivity().findViewById(R.id.orgname);
EditText orgaddress = (EditText)getActivity().findViewById(R.id.orgaddress);
orgname.setVisibility(View.VISIBLE);
orgaddress.setVisibility(View.VISIBLE);
}
例外は発生していませんが、ItemSelectedListner が機能していないようで、EditTexts が表示されています:(
交換後
EditText orgname = (EditText)getActivity()。findViewById(R.id.orgname); EditText orgaddress = (EditText)getActivity()。findViewById(R.id.orgaddress);
と
EditText orgname = (EditText)view.findViewById(R.id.orgname);
EditText orgaddress = (EditText)view.findViewById(R.id.orgaddress);
ManageActivity は、EditTexts が非表示であることを示していますが、アプリケーションは再び停止します。ログは次のとおりです。
05-09 20:58:24.401: E/AndroidRuntime(581): FATAL EXCEPTION: main
05-09 20:58:24.401: E/AndroidRuntime(581): java.lang.NullPointerException
05-09 20:58:24.401: E/AndroidRuntime(581): at com.pfe.risu.ManageActivity$NewCaseFragment.onItemSelected(ManageActivity.java:208)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.widget.AdapterView.fireOnSelected(AdapterView.java:882)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.widget.AdapterView.access$200(AdapterView.java:48)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:848)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.os.Handler.handleCallback(Handler.java:605)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.os.Handler.dispatchMessage(Handler.java:92)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.os.Looper.loop(Looper.java:137)
05-09 20:58:24.401: E/AndroidRuntime(581): at android.app.ActivityThread.main(ActivityThread.java:4340)
05-09 20:58:24.401: E/AndroidRuntime(581): at java.lang.reflect.Method.invokeNative(Native Method)
05-09 20:58:24.401: E/AndroidRuntime(581): at java.lang.reflect.Method.invoke(Method.java:511)
05-09 20:58:24.401: E/AndroidRuntime(581): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-09 20:58:24.401: E/AndroidRuntime(581): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-09 20:58:24.401: E/AndroidRuntime(581): at dalvik.system.NativeStart.main(Native Method)
そしてここに208行目があります：
orgname.setVisibility(View.VISIBLE);