java - 应用程序代码曾经可以工作，但现在崩溃了

Question

事情是我的应用程序过去运行完美，但后来我想更改包名称和类名称，所以我创建了另一个项目并复制粘贴了我的代码并在那里进行了更改。 eclipse 中没有错误，但应用程序现在崩溃了!这是我的应用程序的内容:

public class LocationMobileUser implements LocationListener {

 Context gContext;
   boolean gps_enabled=false;
   boolean network_enabled=false;

    public LocationMobileUser(Context gContext){
        this.gContext = gContext;

   }

    public static final String URL =
            "http://www.ip2phrase.com/ip2phrase.asp?template=%20%3CISP%3E";

    public void XML (View view) {
        GetXMLTask task = new GetXMLTask();
        task.execute(new String[] { URL });
    }

    public class GetXMLTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            String output = null;
            for (String url : urls) {
                output = getOutputFromUrl(url);
            }
            return output;
        }

        public String getOutputFromUrl(String url) {
            StringBuffer output = new StringBuffer("");
            int x =1;
            try {
                InputStream stream = getHttpConnection(url);
                LineNumberReader lnr = new LineNumberReader(new InputStreamReader(stream));  
                String line = "";
                int lineNo;
                for (lineNo = 1; lineNo < 90; lineNo++) {
                    if (lineNo == x) {
                            line = lnr.readLine();
                            //output.append(line);
                            Pattern p = Pattern.compile(">(.*?)<");
                            Matcher m = p.matcher(line);
                            if (m.find()) {
                                  output.append(m.group(1)); // => "isp"
                                }
                    } else
                            lnr.readLine();
            }

            } catch (IOException e1) {
                e1.printStackTrace();
            }
            return output.toString();
        }


        // Makes HttpURLConnection and returns InputStream
        public InputStream getHttpConnection(String urlString)
                throws IOException {
            InputStream stream = null;
            URL url = new URL(urlString);
            URLConnection connection = url.openConnection();

            try {
                HttpURLConnection httpConnection = (HttpURLConnection) connection;
                httpConnection.setRequestMethod("GET");
                httpConnection.connect();

                if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                    stream = httpConnection.getInputStream();
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
            return stream;
        }


    }



    public String getSimOperator() {
        TelephonyManager telephonyManager = (TelephonyManager)gContext.getSystemService(Context.TELEPHONY_SERVICE);
        String operator = telephonyManager.getSimOperatorName();
        return operator;
    } 

   public GsmCellLocation getCellLocation() {
        //String Context=Context.Telephony_SERVICE;
        TelephonyManager telephonyManager = (TelephonyManager)gContext.getSystemService(Context.TELEPHONY_SERVICE);
        GsmCellLocation CellLocation = (GsmCellLocation)telephonyManager.getCellLocation();

        return CellLocation;
    }


    public Location getLocation(){
        String provider = null;
        LocationManager locationManager;
        Location gps_loc=null;
        String context = Context.LOCATION_SERVICE;
        locationManager = (LocationManager)gContext.getSystemService(context);
        gps_loc=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        try{gps_enabled=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
        try{network_enabled=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}
        if(gps_enabled && gps_loc != null){
        provider = LocationManager.GPS_PROVIDER;
        }
        else{
            provider = LocationManager.NETWORK_PROVIDER;
        }
        Location location = locationManager.getLastKnownLocation(provider);
        locationManager.requestLocationUpdates(provider, 20000, 1, this);

        return location; 
    }

    public String getProvider(Location location){
        String provider = null;
        LocationManager locationManager;
        Location gps_loc=null;
        String context = Context.LOCATION_SERVICE;
        locationManager = (LocationManager)gContext.getSystemService(context);
        gps_loc=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        try{gps_enabled=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
        try{network_enabled=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}
        if(gps_enabled && gps_loc != null ){
            provider = LocationManager.GPS_PROVIDER;
            }
        else{
            provider = LocationManager.NETWORK_PROVIDER;
        }
        return provider;
    }


  public String CellLacLocation(GsmCellLocation CellLocation){
       String cidlacString;

       if (CellLocation != null) {
       int cid = CellLocation.getCid();
       int lac = CellLocation.getLac();
       cidlacString = "CellID:" + cid + "\nLAC:" + lac;}
       else {
           cidlacString="No Cell Location Available";
       }
       return cidlacString;

   }

    public String updateWithNewLocation(Location location) {
        String latLongString;

        if (location != null){
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            latLongString = "Latitude:" + lat + "\nLongitude:" + lng;
        }else{
            latLongString = "No Location available";
        }

        return latLongString;
    }

    @Override
    public void onLocationChanged(Location arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        // TODO Auto-generated method stub

    }

}

此应用程序将导出到 JAR 文件中，然后使用构建路径作为库包含到另一个应用程序中；这是我在这个新应用程序中写的:

public class LocationTheApp extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    LocationMobileUser LMU = new LocationMobileUser (this);
    Location location = LMU.getLocation();
    GsmCellLocation CellLocation = LMU.getCellLocation();
    String URL = LocationMobileUser.URL;
    LocationMobileUser.GetXMLTask xmlp = LMU.new GetXMLTask();
    String Provider = LMU.getProvider(location);

    String isp = xmlp.getOutputFromUrl(URL);
    String latLongString = LMU.updateWithNewLocation(location);
    String cidlacString = LMU.CellLacLocation(CellLocation);
    String operator = LMU.getSimOperator();



    TextView myLocationText = (TextView)findViewById(R.id.myLocationText);
    myLocationText.setText("Your current GPS position is:\n" + latLongString);

    TextView myprovider = (TextView)findViewById(R.id.myprovider);
    myprovider.setText("\nYour GPS position is provided by:\n" + Provider);

    TextView myCellLocation = (TextView)findViewById(R.id.mycelllocation);
    myCellLocation.setText("\nYour current Cell position is:\n" + cidlacString);

    TextView myOperator = (TextView)findViewById(R.id.myoperator);
    myOperator.setText("\nYour GSM operator is:\n" + operator);

    TextView myispText = (TextView)findViewById(R.id.myispText);
    myispText.setText("\nYour current ISP is:\n" + isp);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

代码没有错误!!如果它有任何用处，这是我的 list :

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.locationmobileuser"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.locationtheapp.LocationTheApp"
        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>

尝试在 locationmobileuser 和 locationtheapp 之间切换 list 中的包名称，但应用程序仍然崩溃!正如我所说，在我以前的项目中，它曾经像一个魅力一样工作!!日志:

06-18 05:36:54.502: E/Trace(992): error opening trace file: No such file or directory (2)
06-18 05:36:54.852: D/dalvikvm(992): newInstance failed: no <init>()
06-18 05:36:54.862: D/AndroidRuntime(992): Shutting down VM
06-18 05:36:54.862: W/dalvikvm(992): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
06-18 05:36:55.002: E/AndroidRuntime(992): FATAL EXCEPTION: main
06-18 05:36:55.002: E/AndroidRuntime(992): java.lang.RuntimeException: Unable toinstantiate activity     ComponentInfo{com.example.locationmobileuser/com.example.locationmobileuser.LocationMobileUser}: java.lang.InstantiationException: can't instantiate class com.example.locationmobileuser.LocationMobileUser; no empty constructor
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.os.Looper.loop(Looper.java:137)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.ActivityThread.main(ActivityThread.java:5041)
06-18 05:36:55.002: E/AndroidRuntime(992):  at java.lang.reflect.Method.invokeNative(Native Method)
06-18 05:36:55.002: E/AndroidRuntime(992):  at java.lang.reflect.Method.invoke(Method.java:511)
06-18 05:36:55.002: E/AndroidRuntime(992):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-18 05:36:55.002: E/AndroidRuntime(992):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-18 05:36:55.002: E/AndroidRuntime(992):  at dalvik.system.NativeStart.main(Native Method)
06-18 05:36:55.002: E/AndroidRuntime(992): Caused by: java.lang.InstantiationException: can't instantiate class com.example.locationmobileuser.LocationMobileUser; no empty constructor
06-18 05:36:55.002: E/AndroidRuntime(992):  at java.lang.Class.newInstanceImpl(Native Method)
06-18 05:36:55.002: E/AndroidRuntime(992):  at java.lang.Class.newInstance(Class.java:1319)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
06-18 05:36:55.002: E/AndroidRuntime(992):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
06-18 05:36:55.002: E/AndroidRuntime(992):  ... 11 more

任何帮助将不胜感激!!

Answer 1

查看menifest的包名

 package="com.example.locationmobileuser

和activity包名一样改这个包

<activity
        android:name="com.example.locationtheapp.LocationTheApp"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>