我尝试在this教程的帮助下创建的简单游戏中使用AdMob广告，但我收到的NullPointerException错误似乎无法解决。
以下是我修改的AndroidGame类，其中包含一个线性布局（我相信这是AdMob广告所必需的）
package com.kilobolt.framework.implementation;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.view.Window;
import android.view.WindowManager;
import com.harryhochwarter.frugalfarminggame.R;
import com.kilobolt.framework.Audio;
import com.kilobolt.framework.FileIO;
import com.kilobolt.framework.Game;
import com.kilobolt.framework.Graphics;
import com.kilobolt.framework.Input;
import com.kilobolt.framework.Screen;
public abstract class AndroidGame extends Activity implements Game {
AndroidFastRenderView renderView;
Graphics graphics;
Audio audio;
Input input;
FileIO fileIO;
Screen screen;
WakeLock wakeLock;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
boolean isPortrait = getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;
int frameBufferWidth = isPortrait ? 480: 800;
int frameBufferHeight = isPortrait ? 800: 480;
Bitmap frameBuffer = Bitmap.createBitmap(frameBufferWidth,
frameBufferHeight, Config.RGB_565);
float scaleX = (float) frameBufferWidth
/ getWindowManager().getDefaultDisplay().getWidth();
float scaleY = (float) frameBufferHeight
/ getWindowManager().getDefaultDisplay().getHeight();
renderView = new AndroidFastRenderView(this, frameBuffer);
graphics = new AndroidGraphics(getAssets(), frameBuffer);
fileIO = new AndroidFileIO(this);
audio = new AndroidAudio(this);
input = new AndroidInput(this, renderView, scaleX, scaleY);
screen = getInitScreen();
setContentView(renderView);
PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "MyGame");
}
@Override
public void onResume() {
super.onResume();
wakeLock.acquire();
screen.resume();
renderView.resume();
}
@Override
public void onPause() {
super.onPause();
wakeLock.release();
renderView.pause();
screen.pause();
if (isFinishing())
screen.dispose();
}
@Override
public Input getInput() {
return input;
}
@Override
public FileIO getFileIO() {
return fileIO;
}
@Override
public Graphics getGraphics() {
return graphics;
}
@Override
public Audio getAudio() {
return audio;
}
@Override
public void setScreen(Screen screen) {
if (screen == null)
throw new IllegalArgumentException("Screen must not be null");
this.screen.pause();
this.screen.dispose();
screen.resume();
screen.update(0);
this.screen = screen;
}
public Screen getCurrentScreen() {
return screen;
}
}
以下是应用程序启动时运行的SampleGame类（我也不确定我的测试设备代码是否正确，因为我无法弄清楚如何检查它。
package com.harryhochwarter.frugalfarminggame;
import android.os.Bundle;
import com.google.android.gms.ads.*;
import com.kilobolt.framework.Screen;
import com.kilobolt.framework.implementation.AndroidGame;
public class SampleGame extends AndroidGame
{
public static String map;
boolean firstTimeCreate = true;
//
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
AdView adView = (AdView)findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.addTestDevice("AC98C820A50B4AD8A2106EDE96FB87D4")
.build();
adView.loadAd(adRequest);
}
@Override
public Screen getInitScreen()
{
if(firstTimeCreate)
{
Assets.load(this);
firstTimeCreate = false;
}
return new SplashLoadingScreen(this);
}
@Override
public void onBackPressed()
{
getCurrentScreen().backButton();
}
@Override
public void onResume()
{
super.onResume();
//Assets.theme.play();
}
@Override
public void onPause()
{
super.onPause();
//Assets.theme.pause();
}
}
最后，这是我的logcat输出
08-12 06:03:13.890: D/dalvikvm(1317): GC_FOR_ALLOC freed 72K, 9% free 2179K/2392K, paused 85ms, total 91ms
08-12 06:03:13.890: I/dalvikvm-heap(1317): Grow heap (frag case) to 2.993MB for 768016-byte allocation
08-12 06:03:13.900: D/dalvikvm(1317): GC_FOR_ALLOC freed <1K, 7% free 2928K/3144K, paused 12ms, total 12ms
08-12 06:03:14.150: D/AndroidRuntime(1317): Shutting down VM
08-12 06:03:14.150: W/dalvikvm(1317): threadid=1: thread exiting with uncaught exception (group=0xb1aeed70)
08-12 06:03:14.160: E/AndroidRuntime(1317): FATAL EXCEPTION: main
08-12 06:03:14.160: E/AndroidRuntime(1317): Process: com.harryhochwarter.frugalfarminggame, PID: 1317
08-12 06:03:14.160: E/AndroidRuntime(1317): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.harryhochwarter.frugalfarminggame/com.harryhochwarter.frugalfarminggame.SampleGame}: java.lang.NullPointerException
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2197)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.ActivityThread.access$800(ActivityThread.java:138)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.os.Handler.dispatchMessage(Handler.java:102)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.os.Looper.loop(Looper.java:136)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.ActivityThread.main(ActivityThread.java:5026)
08-12 06:03:14.160: E/AndroidRuntime(1317): at java.lang.reflect.Method.invokeNative(Native Method)
08-12 06:03:14.160: E/AndroidRuntime(1317): at java.lang.reflect.Method.invoke(Method.java:515)
08-12 06:03:14.160: E/AndroidRuntime(1317): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
08-12 06:03:14.160: E/AndroidRuntime(1317): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
08-12 06:03:14.160: E/AndroidRuntime(1317): at dalvik.system.NativeStart.main(Native Method)
08-12 06:03:14.160: E/AndroidRuntime(1317): Caused by: java.lang.NullPointerException
08-12 06:03:14.160: E/AndroidRuntime(1317): at com.harryhochwarter.frugalfarminggame.SampleGame.onCreate(SampleGame.java:25)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.Activity.performCreate(Activity.java:5242)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-12 06:03:14.160: E/AndroidRuntime(1317): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
08-12 06:03:14.160: E/AndroidRuntime(1317): ... 11 more
08-12 06:08:15.060: I/Process(1317): Sending signal. PID: 1317 SIG: 9
如果我需要发布任何其他内容或格式化不同的内容，请告知我们。我是stackoverflow和android开发的新手。
根据mohan的要求，这是main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.gms.ads.AdView android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adUnitId="ca-app-pub-9472185097153282/1248179452"
ads:adSize="BANNER"/>
</LinearLayout>
答案 0 :(得分：0)
您的代码AdView adView = (AdView)findViewById(R.id.adView);无法在布局中找到该视图。这就是为什么adView对象为null并在您尝试访问该对象的方法时给出nullpointerexception。
检查布局文件夹中的main.xml文件中是否有标识为"@+id/adView"的Admob广告视图。