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ModAdapterFragment類的NullPointerException錯誤
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Created by Deep Depinder Singh on 8/10/2016.
*/
public class ModeAdapterFragment extends android.support.v4.app.Fragment {
public ListView listView;
/**
* Called when the fragment's activity has been created and this
* fragment's view hierarchy instantiated. It can be used to do final
* initialization once these pieces are in place, such as retrieving
* views or restoring state. It is also useful for fragments that use
* {@link #setRetainInstance(boolean)} to retain their instance,
* as this callback tells the fragment when it is fully associated with
* the new activity instance. This is called after {@link #onCreateView}
* and before {@link #onViewStateRestored(Bundle)}.
*
* @param savedInstanceState If the fragment is being re-created from
* a previous saved state, this is the state.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_setting, container, false);
final ArrayList<DummyData> words = new ArrayList<DummyData>();
//words.add("One");
words.add(new DummyData(R.drawable.family_son, "One", "Lutti"));
words.add(new DummyData(R.drawable.family_son, "two", "Lutti"));
words.add(new DummyData(R.drawable.family_son, "Three", "Lutti"));
words.add(new DummyData(R.drawable.family_son, "Four", "Lutti"));
DummyDataAdapter itemsAdapter = new DummyDataAdapter(getActivity(), words);
listView = (ListView) v.findViewById(R.id.list);
listView.setAdapter(itemsAdapter);
return v;
}
/* @Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
*/
}
DummyDataAdapter類
package com.example.deepdepindersingh.activevoice;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by Deep Depinder Singh on 8/13/2016.
*/
public class DummyDataAdapter extends ArrayAdapter<DummyData> {
public DummyDataAdapter(Context context, ArrayList<DummyData> dummyData){
super(context, 0, dummyData);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
if(listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item_record, parent, false);
}
// Get the {@link AndroidFlavor} object located at this position in the list
DummyData currentAndroidFlavor = getItem(position);
// Find the TextView in the list_item.xml layout with the ID version_name
TextView nameTextView = (TextView) listItemView.findViewById(R.id.caller_text_view);
// Get the version name from the current AndroidFlavor object and
// set this text on the name TextView
nameTextView.setText(currentAndroidFlavor.getCallerName());
// Find the TextView in the list_item.xml layout with the ID version_number
TextView numberTextView = (TextView) listItemView.findViewById(R.id.date_text_view);
// Get the version number from the current AndroidFlavor object and
// set this text on the number TextView
numberTextView.setText(currentAndroidFlavor.getCallerDate());
ImageView imageView = (ImageView) listItemView.findViewById(R.id.image);
imageView.setImageResource(currentAndroidFlavor.getCallerImageResource());
return listItemView;
}
}
DummyData類
package com.example.deepdepindersingh.activevoice;
/**
* Created by Deep Depinder Singh on 8/13/2016.
*/
public class DummyData {
private String mCallerName;
private String mCallerDate;
private int mCallerImageResource;
public DummyData(int callerImageResource, String callerName, String callerDate){
mCallerImageResource = callerImageResource;
mCallerName = callerName;
mCallerDate = callerDate;
}
public String getCallerName(){
return mCallerName;
}
public String getCallerDate(){
return mCallerDate;
}
public int getCallerImageResource(){
return mCallerImageResource;
}
}
佈局文件FragmentMode.xml
<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/list"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
layot文件List_item_record.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="@dimen/list_item_height"
android:background="@color/colorAccent">
<ImageView
android:id="@+id/image"
android:layout_width="@dimen/list_item_height"
android:layout_height="@dimen/list_item_height"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/text_container"
android:orientation="vertical"
android:paddingLeft="16dp"
>
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:gravity="bottom"
android:id="@+id/caller_text_view"
tools:text="lutti"
android:textAppearance="?android:textAppearanceMedium"
android:textColor="@android:color/white"
android:textStyle="bold"
android:layout_weight="1"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="@+id/date_text_view"
tools:text="one"
android:textAppearance="?android:textAppearanceMedium"
android:textColor="@android:color/white"
android:layout_weight="1"
android:gravity="top"
/>
</LinearLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/call_button"
>
</RelativeLayout>
</LinearLayout>
MainActivity類別
package com.example.deepdepindersingh.activevoice;
import android.support.design.widget.TabLayout;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TableLayout;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
SimpleFragmentPagerAdapter adapter = new SimpleFragmentPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(viewPager);
}
}
由於我是新來的Android編程和我一直在迴環這個代碼，因爲早上我不能找到一個解決方案來解決這個代碼我想在3個片段中顯示數據。請幫我重新評估一下。感謝名單....
logcat的抓住了這一錯誤消息
08-14 00:47:46.382 2730-2730/com.example.deepdepindersingh.activevoice W/System: ClassLoader referenced unknown path: /data/app/com.example.deepdepindersingh.activevoice-2/lib/x86_64
08-14 00:47:50.900 2730-2730/com.example.deepdepindersingh.activevoice W/System: ClassLoader referenced unknown path: /data/app/com.example.deepdepindersingh.activevoice-2/lib/x86_64
08-14 00:47:51.003 2730-2740/com.example.deepdepindersingh.activevoice W/art: Suspending all threads took: 16.395ms
08-14 00:47:51.535 2730-2736/com.example.deepdepindersingh.activevoice W/art: Suspending all threads took: 120.484ms
08-14 00:47:51.583 2730-2730/com.example.deepdepindersingh.activevoice W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
08-14 00:47:51.919 2730-2736/com.example.deepdepindersingh.activevoice W/art: Suspending all threads took: 9.823ms
08-14 00:47:52.192 2730-2846/com.example.deepdepindersingh.activevoice D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
[ 08-14 00:47:52.214 2730: 2730 D/ ]
HostConnection::get() New Host Connection established 0x7f85e5913940, tid 2730
08-14 00:47:52.273 2730-2730/com.example.deepdepindersingh.activevoice D/AndroidRuntime: Shutting down VM
08-14 00:47:52.518 2730-2736/com.example.deepdepindersingh.activevoice W/art: Suspending all threads took: 76.800ms
--------- beginning of crash
08-14 00:47:52.520 2730-2730/com.example.deepdepindersingh.activevoice E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.deepdepindersingh.activevoice, PID: 2730
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at com.example.deepdepindersingh.activevoice.ModeAdapterFragment.onCreateView(ModeAdapterFragment.java:49)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1632)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1237)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1085)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:391)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)
at android.view.View.measure(View.java:18788)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
你可以請張貼全部痕跡嗎？ – 2016-08-13 19:11:03
整個痕跡???對不起，我沒有得到那 – user3701411
你得到一個NullPointer異常。請發佈整個「消息」堆棧;看起來像這樣https://blog.jetbrains.com/idea/files/2010/03/screen-shot-2010-03-17-at-100031-am.png – 2016-08-13 19:13:47