Android应用程序总是崩溃

Question

任何人都可以告诉我什么是错的？ 该应用程序总是在设备SE xperia X10上崩溃。也许这是我嵌入ADMOB的方式。 它甚至不显示一秒钟。请提供任何线索吗？ 在XML和清单中，一切似乎都没事。 谢谢

package com.taiic.template.admob; 


import com.google.ads.AdRequest; 
import com.google.ads.AdView; 
import java.io.IOException; 
import java.util.*; 

import android.widget.*; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.annotation.SuppressLint; 
import android.app.Activity; 
import android.os.Bundle; 
import android.location.*; 
import android.content.*; 

import android.app.Activity; 
import android.os.Bundle; 

public class adMain extends Activity { 

    Button addressButton; 
    TextView locationText; 
    TextView addressText; 
    Location currentLocation; 
    double currentLatitude; 
    double currentLongitude; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 




    addressText = (TextView)findViewById(R.id.addressText); 
    locationText = (TextView)findViewById(R.id.locationText); 
    addressButton = (Button)findViewById(R.id.addressButton); 

    this.addressText.setText("ready"); 

    LocationManager locationManager = 
     (LocationManager)this.getSystemService(Context.LOCATION_SERVICE); 

    LocationListener locationListener = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      updateLocation(location); 
     } 
     public void onStatusChanged(
       String provider, int status, Bundle extras) {} 
     public void onProviderEnabled(String provider) {} 
     public void onProviderDisabled(String provider) {} 
    }; 

    locationManager.requestLocationUpdates(
      LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); 

    this.addressButton.setOnClickListener(new OnClickListener() { 
     public void onClick(View v){ 
      getAddress(); 
     } 
    }); 
} 

void getAddress(){ 
    try{ 
     Geocoder gcd = new Geocoder(this, Locale.getDefault()); 
     List<Address> addresses = 
      gcd.getFromLocation(currentLatitude, currentLongitude,100); 
     if (addresses.size() > 0) { 
      StringBuilder result = new StringBuilder(); 
      for(int i = 0; i < addresses.size(); i++){ 
       Address address = addresses.get(i); 
       int maxIndex = address.getMaxAddressLineIndex(); 
       for (int x = 0; x <= maxIndex; x++){ 
        result.append(address.getAddressLine(x)); 
        result.append(","); 
       }    
       result.append(address.getLocality()); 
       result.append(","); 
       result.append(address.getPostalCode()); 
       result.append("\n\n"); 
      } 
      addressText.setText(result.toString()); 
     } 
    } 
    catch(IOException ex){ 
     addressText.setText(ex.getMessage().toString()); 
    } 
} 

void updateLocation(Location location){ 
    currentLocation = location; 
    currentLatitude = currentLocation.getLatitude(); 
    currentLongitude = currentLocation.getLongitude(); 
    locationText.setText(currentLatitude + ", " + currentLongitude); 
} 

AdView layout = (AdView)this.findViewById(R.id.adView); 
AdRequest adRequest = new AdRequest(); 
adRequest.setTesting(true); 
layout.loadAd(adRequest); 
} 

这里是目录下载

07-13 00:10:59.451: D/AndroidRuntime(3735): Shutting down VM 
07-13 00:10:59.451: W/dalvikvm(3735): threadid=1: thread exiting with uncaught exception (group=0x4001d560) 
07-13 00:10:59.461: E/AndroidRuntime(3735): FATAL EXCEPTION: main 
07-13 00:10:59.461: E/AndroidRuntime(3735): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.taiic.template.admob/com.taiic.template.admob.adMain}: java.lang.NullPointerException 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1581) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.ActivityThread.access$1500(ActivityThread.java:121) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.os.Looper.loop(Looper.java:123) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.ActivityThread.main(ActivityThread.java:3701) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at java.lang.reflect.Method.invoke(Method.java:507) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at dalvik.system.NativeStart.main(Native Method) 
07-13 00:10:59.461: E/AndroidRuntime(3735): Caused by: java.lang.NullPointerException 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.Activity.findViewById(Activity.java:1647) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at com.taiic.template.admob.adMain.<init>(adMain.java:102) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at java.lang.Class.newInstanceImpl(Native Method) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at java.lang.Class.newInstance(Class.java:1409) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573) 
07-13 00:10:59.461: E/AndroidRuntime(3735):  ... 11 more 

Answer 1

日志是关于什么地方出了错非常清楚：

Caused by: java.lang.NullPointerException 
at android.app.Activity.findViewById(Activity.java:1647) 
at com.taiic.template.admob.adMain.<init>(adMain.java:102) 

在类adMain，上线102，你是试图夸大活动布局中不存在的视图：

AdView layout = (AdView)this.findViewById(R.id.adView); 

所以问题是：你是否实际添加了一个AdView视图（ID为android:id="@+id/adView"）到您设置为活动内容视图的main.xml文件中定义的布局？错误表明你没有。