我已经调试了几个小时,但仍然没有运气。我使用 Android 片段制作了一个 RSS 阅读器。它在运行 Android 的设备上运行良好,但在 Android设备4.0.x to 4.1.x
上启动时崩溃。4.2.x
我真的很感激我能得到的任何帮助。
日志猫:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.impsycho.androidpakistan/com.impsycho.androidpakistan.ItemListActivity}:
android.view.InflateException: Binary XML file line #1: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
at android.app.Activity.setContentView(Activity.java:1881)
at com.impsycho.androidpakistan.ItemListActivity.onCreate(ItemListActivity.java:13)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
... 11 more
Caused by: java.lang.NullPointerException
at com.impsycho.androidpakistan.ItemListFragment$GetAllThePosts.onPreExecute(ItemListFragment.java:157)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
at android.os.AsyncTask.execute(AsyncTask.java:534)
at com.impsycho.androidpakistan.ItemListFragment.onCreate(ItemListFragment.java:54)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:835)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1061)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1160)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
... 20 more
Sending signal. PID: 30286 SIG: 9
主要活动:
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
public class ItemListActivity extends FragmentActivity implements ItemListFragment.Callbacks {
private boolean mTwoPane;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_list);
getActionBar().setDisplayShowTitleEnabled(false);
if (findViewById(R.id.item_detail_container) != null) {
mTwoPane = true;
((ItemListFragment) getSupportFragmentManager()
.findFragmentById(R.id.item_list))
.setActivateOnItemClick(true);
}
}
...
activity_item_list.xml
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/item_list"
android:name="com.impsycho.androidpakistan.ItemListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ItemListActivity" />
activity_item_twopane.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="?android:attr/dividerHorizontal"
android:orientation="horizontal"
android:showDividers="middle"
tools:context=".ItemListActivity" >
<fragment
android:id="@+id/item_list"
android:name="com.impsycho.androidpakistan.ItemListFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2.5" />
<FrameLayout
android:id="@+id/item_detail_container"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="5" />
</LinearLayout>