我的新应用程序有一个大问题，我正在使用新的 ATD Plugin for Eclipse 提供的新 FragmentActivity。分步指南为我创建了包含 3 部分的主要 FragmentActivity。
这是代码：
package com.italiandevteam.chuck;
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.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;
public class ChuckActivity extends FragmentActivity{
/**
* 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
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chuck);
// 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);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_chuck, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary
* sections of the app.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, i + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0: return getString(R.string.title_section1);
case 1: return getString(R.string.title_section2);
case 2: return getString(R.string.title_section3);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
public DummySectionFragment() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Create the view
}
}
}
我在我的开关中插入以onCreateView这种方式显示不同的布局：
switch(args.getInt(ARG_SECTION_NUMBER)){
case 1:{
myView = getLayoutInflater(null).inflate(R.layout.layout_1, null);
break;
}
case 2:{
myView = getLayoutInflater(null).inflate(R.layout.layout_2, null);
break;
}
}
return myView
现在我真的需要将 admob 添加到我的项目中，但如果我把这个 coe 放在onCreate方法中
AdView adView;
// Create the adView
adView = new AdView(this, AdSize.BANNER, "a14eedc43db2122");
// Lookup your LinearLayout assuming it’s been given
// the attribute android:id="@+id/mainLayout"
LinearLayout layout = (LinearLayout)findViewById(R.id.linearLayout);
// Add the adView to it
layout.addView(adView);
AdRequest request = new AdRequest();
request.addTestDevice(AdRequest.TEST_EMULATOR);
request.addTestDevice("B7709F3C1336BFAEFAD6E50877E3211F");
// Initiate a generic request to load it with an ad
adView.loadAd(request);
我的应用程序将崩溃并且 logcat：
07-11 10:40:21.963: E/AndroidRuntime(4948): FATAL EXCEPTION: main
07-11 10:40:21.963: E/AndroidRuntime(4948): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.italiandevteam.chuck/com.italiandevteam.chuck.ChuckActivity}: java.lang.NullPointerException
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.os.Handler.dispatchMessage(Handler.java:99)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.os.Looper.loop(Looper.java:130)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.ActivityThread.main(ActivityThread.java:3835)
07-11 10:40:21.963: E/AndroidRuntime(4948): at java.lang.reflect.Method.invokeNative(Native Method)
07-11 10:40:21.963: E/AndroidRuntime(4948): at java.lang.reflect.Method.invoke(Method.java:507)
07-11 10:40:21.963: E/AndroidRuntime(4948): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
07-11 10:40:21.963: E/AndroidRuntime(4948): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
07-11 10:40:21.963: E/AndroidRuntime(4948): at dalvik.system.NativeStart.main(Native Method)
07-11 10:40:21.963: E/AndroidRuntime(4948): Caused by: java.lang.NullPointerException
07-11 10:40:21.963: E/AndroidRuntime(4948): at com.italiandevteam.chuck.ChuckActivity.onCreate(ChuckActivity.java:66)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-11 10:40:21.963: E/AndroidRuntime(4948): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
07-11 10:40:21.963: E/AndroidRuntime(4948): ... 11 more
我找不到在我的项目中插入 adMob 的方法，你能帮帮我吗？
编辑：
这是我的 activity_chuck.xml
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ChuckActivity">
<!--
This title strip will display the currently visible page title, as well as the page
titles for adjacent pages.
-->
<android.support.v4.view.PagerTitleStrip android:id="@+id/pager_title_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#000"
android:textColor="#fff"
android:paddingTop="4dp"
android:paddingBottom="4dp" />
</android.support.v4.view.ViewPager>
这是我的 layout_1（类似于 layout_2）：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/linearLayout"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="top"
>
</LinearLayout>
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/img_top" />
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/titolo_scheda"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/biografia"
android:gravity="center"
android:textSize="22sp"
>
</TextView>
</ScrollView>
</LinearLayout>
编辑 2：现在使用开关中的 admob 代码，它可以工作，但仅适用于第一页，如果我滑动到第二部分，我就崩溃了，这是 LogCat：
07-11 14:51:27.117: E/AndroidRuntime(6282): FATAL EXCEPTION: main
07-11 14:51:27.117: E/AndroidRuntime(6282): java.lang.NullPointerException
07-11 14:51:27.117: E/AndroidRuntime(6282): at com.italiandevteam.chuck.ChuckActivity$DummySectionFragment.onCreateView(ChuckActivity.java:139)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:871)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.view.ViewPager.populate(ViewPager.java:895)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.view.ViewPager.populate(ViewPager.java:772)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1539)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:1422)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewGroup.drawChild(ViewGroup.java:1562)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.View.draw(View.java:6900)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.widget.FrameLayout.draw(FrameLayout.java:357)
07-11 14:51:27.117: E/AndroidRuntime(6282): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1908)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewRoot.draw(ViewRoot.java:1527)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewRoot.performTraversals(ViewRoot.java:1263)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.view.ViewRoot.handleMessage(ViewRoot.java:1865)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.os.Handler.dispatchMessage(Handler.java:99)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.os.Looper.loop(Looper.java:130)
07-11 14:51:27.117: E/AndroidRuntime(6282): at android.app.ActivityThread.main(ActivityThread.java:3835)
07-11 14:51:27.117: E/AndroidRuntime(6282): at java.lang.reflect.Method.invokeNative(Native Method)
07-11 14:51:27.117: E/AndroidRuntime(6282): at java.lang.reflect.Method.invoke(Method.java:507)
07-11 14:51:27.117: E/AndroidRuntime(6282): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
07-11 14:51:27.117: E/AndroidRuntime(6282): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
07-11 14:51:27.117: E/AndroidRuntime(6282): at dalvik.system.NativeStart.main(Native Method)
我已经将 admob 的 xml LinearLayout 也放在了第二个布局中，这里 layout_2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/img_top" />
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal" >
<ImageButton
android:id="@+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/bryce" />
<ImageButton
android:id="@+id/imageButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/beckman" />
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TableRow>
</TableLayout>
</ScrollView>
<LinearLayout
android:id="@+id/linearLayout"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="top"
>
</LinearLayout>
</LinearLayout>