我正在尝试在我的Android应用程序中添加adMob广告，但它让我遗憾地停止了错误，
我不是android程序的专家所以不知道什么是错误的。
下面是我的MainActivity, adview, and manifest
MainActivity
package com.nyt.ilm.ilmsarf;
import java.util.ArrayList;
import java.util.List;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.nyt.ilm.ilmsarf.P1.OnFragmentInteractionListener;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
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.support.v4.view.ViewPager.LayoutParams;
import android.view.ViewTreeObserver;
import android.widget.ListView;
import android.widget.RelativeLayout;
public class MainActivity extends FragmentActivity implements
OnFragmentInteractionListener {
ViewPager viewpager;
Context mContext=MainActivity.this;
SharedPreferences appPreferences;
boolean isAppInstalled = false;
/* Your ad unit id. Replace with your actual ad unit id. */
public boolean adViewHeightSet = false;
@Override
protected void onCreate(Bundle arg0) {
// TODO Auto-generated method stub
super.onCreate(arg0);
appPreferences = PreferenceManager.getDefaultSharedPreferences(this);
isAppInstalled = appPreferences.getBoolean("isAppInstalled",false);
if(isAppInstalled==false){
// add shortcutIcon code here
Intent shortcutIntent = new Intent(getApplicationContext(),
MainActivity.class);
shortcutIntent.setAction(Intent.ACTION_MAIN);
//shortcutIntent is added with addIntent
Intent addIntent = new Intent();
addIntent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
addIntent.putExtra(Intent.EXTRA_SHORTCUT_NAME, "IlmSarf");
addIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
Intent.ShortcutIconResource.fromContext(getApplicationContext(),
R.drawable.ic_launcher));
addIntent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
// finally broadcast the new Intent
getApplicationContext().sendBroadcast(addIntent);
// finally isAppInstalled should be true.
SharedPreferences.Editor editor = appPreferences.edit();
editor.putBoolean("isAppInstalled", true);
editor.commit();
}
setContentView(R.layout.activity_main);
viewpager = (ViewPager) findViewById(R.id.pager);
FragmentPagerAdapter fm = new MyPageAdapter(getSupportFragmentManager());
viewpager.setAdapter(fm);
viewpager.setCurrentItem(fm.getCount() - 1);
//// Ad Banner
AdView adView = (AdView)this.findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);
adView.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (adViewHeightSet) return;
AdView adView = (AdView) findViewById(R.id.adView);
ListView list = (ListView) findViewById(R.id.list);
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT
);
params.setMargins(0, 0, 0, adView.getHeight()+ 15);
list.setLayoutParams(params);
adViewHeightSet = true;
}
});
}
@Override
public void onFragmentInteraction(Uri uri) {
// TODO Auto-generated method stub
}
}
class MyPageAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public MyPageAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
this.fragments = new ArrayList<Fragment>();
fragments.add(new P1());
fragments.add(new P2());
fragments.add(new P3());
}
@Override
public Fragment getItem(int position) {
// TODO Auto-generated method stub
return fragments.get(position);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return fragments.size();
}
}
adview.xml
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" xmlns:android="http://schemas.android.com/apk/res/android">
<com.google.android.gms.ads.AdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"/>
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="@null"
android:dividerHeight="0dp">
</ListView>
</RelativeLayout>
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.nyt.ilm.ilmsarf"
android:versionCode="3"
android:versionName="1.3" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT"/>
<uses-permission android:name='com.android.launcher.permission.UNINSTALL_SHORTCUT'/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"/>
<activity android:label="@string/app_name" android:name="adview">
</activity>
<activity
android:name="com.nyt.ilm.ilmsarf.MainActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize">
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这里是logcat
06-19 17:19:05.452: I/Process(1144): Sending signal. PID: 1144 SIG: 9
06-19 17:19:49.687: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.687: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.687: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.687: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.687: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.687: D/jdwp(1237): sendBufferedRequest : len=0x41
06-19 17:19:49.698: D/dalvikvm(1237): open_cached_dex_file : /data/app/com.nyt.ilm.ilmsarf-1.apk /data/dalvik-cache/data@app@com.nyt.ilm.ilmsarf-1.apk@classes.dex
06-19 17:19:49.699: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.699: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.699: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.699: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.705: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.705: W/Trace(1237): Unexpected value from nativeGetEnabledTags: 0
06-19 17:19:49.706: D/dalvikvm(1237): create interp thread : stack size=32KB
06-19 17:19:49.706: D/dalvikvm(1237): create new thread
06-19 17:19:49.706: D/dalvikvm(1237): new thread created
06-19 17:19:49.706: D/dalvikvm(1237): update thread list
06-19 17:19:49.706: D/dalvikvm(1237): threadid=11: interp stack at 0x5d824000
06-19 17:19:49.706: D/dalvikvm(1237): threadid=11: created from interp
06-19 17:19:49.706: D/dalvikvm(1237): start new thread
06-19 17:19:49.706: D/dalvikvm(1237): threadid=11: notify debugger
06-19 17:19:49.706: D/dalvikvm(1237): threadid=11 (SharedPreferencesImpl-load): calling run()
06-19 17:19:49.709: D/dalvikvm(1237): threadid=11: exiting
06-19 17:19:49.709: D/dalvikvm(1237): threadid=11: bye!
06-19 17:19:49.721: D/skia(1237): Flag is not 10
06-19 17:19:49.726: D/skia(1237): Flag is not 10
06-19 17:19:49.736: D/skia(1237): Flag is not 10
06-19 17:19:49.762: D/AndroidRuntime(1237): Shutting down VM
06-19 17:19:49.763: W/dalvikvm(1237): threadid=1: thread exiting with uncaught exception (group=0x40f829a8)
06-19 17:19:49.766: E/AndroidRuntime(1237): FATAL EXCEPTION: main
06-19 17:19:49.766: E/AndroidRuntime(1237): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nyt.ilm.ilmsarf/com.nyt.ilm.ilmsarf.MainActivity}: java.lang.NullPointerException
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.ActivityThread.access$600(ActivityThread.java:156)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.os.Handler.dispatchMessage(Handler.java:99)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.os.Looper.loop(Looper.java:153)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.ActivityThread.main(ActivityThread.java:5297)
06-19 17:19:49.766: E/AndroidRuntime(1237): at java.lang.reflect.Method.invokeNative(Native Method)
06-19 17:19:49.766: E/AndroidRuntime(1237): at java.lang.reflect.Method.invoke(Method.java:511)
06-19 17:19:49.766: E/AndroidRuntime(1237): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
06-19 17:19:49.766: E/AndroidRuntime(1237): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-19 17:19:49.766: E/AndroidRuntime(1237): at dalvik.system.NativeStart.main(Native Method)
06-19 17:19:49.766: E/AndroidRuntime(1237): Caused by: java.lang.NullPointerException
06-19 17:19:49.766: E/AndroidRuntime(1237): at com.nyt.ilm.ilmsarf.MainActivity.onCreate(MainActivity.java:76)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.Activity.performCreate(Activity.java:5122)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
06-19 17:19:49.766: E/AndroidRuntime(1237): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
06-19 17:19:49.766: E/AndroidRuntime(1237): ... 11 more
06-19 17:19:49.777: D/dalvikvm(1237): GC_CONCURRENT freed 287K, 4% free 9187K/9500K, paused 1ms+2ms, total 20ms
请帮忙。
提前致谢。
答案 0 :(得分：1)
有 NullPointerExcception
它导致因为使用null对象或没有定义对象的值。
您使用的是 activity_main.xml ，而您的xml是 adview.xml
因此无法找到listview和adview
试试这个
更改此
setContentView(R.layout.activity_main);
到
setContentView(R.layout.adview.xml);