java.lang.RuntimeException: Unable to instantiate activity ComponentInfo .... java.lang.ClassNotFoundException
I have a problem that I'm dealing with since three days and I have tried to read different answers but it didn't help. Can someone help me too!! I write Ancdroid app as client to a restful web service. I can get data from the database without a problem but my problem is with my 2 Activities that I am using to work with this file got from a database.
Main activity
public class MainActivity extends Activity {
private static final String SERVICE_URL = "http://10.0.2.2:8080/.....";
private static final String TAG = "AndroidRESTClientActivity";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void retrieveSampleData(View vw) {
EditText idTxt = (EditText) findViewById(R.id.id_textfield);
String id = idTxt.getText().toString();
String sampleURL = SERVICE_URL +"daten/"+id ;
Log.d("getrespond()", "service calling");
String url =sampleURL;
RestClient client = new RestClient(url);
try{
client.Execute(RestClient.RequestMethod.GET,this.getApplicationContext());
}
catch (Exception e) {
String error = String.valueOf(e);
Log.d("**********client.Execute(RequestMethod.GET);***********",error);
}
try {
if(client.getResponseCode() == 200) {
Log.d("Response is 200", String.valueOf(client.getResponse().length()));
System.out.println(this.getFilesDir().getPath().toString());
File daten= client.getResponse();
System.out.println(daten.getName());
Toast.makeText(this.getApplicationContext(), "Responce is "+String.valueOf(client.getResponseCode()), 2000).show();
} else {
String error = String.valueOf(client.getResponse());
Log.d("Response*********** not 200 ************", String.valueOf(client.getResponse()));
}
}catch (Exception e) {
e.printStackTrace();
Log.d("EXCEPTIONI IS 3", e.toString());
// TODO: handle exception
}
startActivity(new Intent("android.intent.action.LINEGRAPH"));
the other activity that I start from the main:
public class lineGraph extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_line_graph);
}
@Override
protected void onResume() {
super.onResume();
if (mChartView == null) {
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
try {
mChartView = ChartFactory.getLineChartView(this, getDemoDataset(),
getDemoRenderer());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
layout.addView(mChartView, new LayoutParams
(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
} else {
mChartView.repaint();
}
}
Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.praktikum.androidcrestclient"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.INTERNET" >
</uses-permission>
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.praktikum.androidcrestclient.LineGraph"
android:label="@string/title_activity_line_graph" >
<intent-filter>
<action android:name="android.intent.action.LINEGRAPH" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name="org.achartengine.GraphicalActivity"/>
</application>
</manifest>
and here my LogCat
10-08 09:23:10.140: D/AndroidRuntime(4706): Shutting down VM
10-08 09:23:10.140: W/dalvikvm(4706): threadid=1: thread exiting with uncaught exception (group=0x40015560)
10-08 09:23:10.161: E/AndroidRuntime(4706): FATAL EXCEPTION: main
10-08 09:23:10.161: E/AndroidRuntime(4706): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.LineGraph}: java.lang.ClassNotFoundException: com.praktikum.androidcrestclient.LineGraph in loader dalvik.system.PathClassLoader[/data/app/com.praktikum.androidcrestclient-1.apk]
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.os.Handler.dispatchMessage(Handler.java:99)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.os.Looper.loop(Looper.java:123)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-08 09:23:10.161: E/AndroidRuntime(4706): at java.lang.reflect.Method.invokeNative(Native Method)
10-08 09:23:10.161: E/AndroidRuntime(4706): at java.lang.reflect.Method.invoke(Method.java:507)
10-08 09:23:10.161: E/AndroidRuntime(4706): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-08 09:23:10.161: E/AndroidRuntime(4706): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-08 09:23:10.161: E/AndroidRuntime(4706): at dalvik.system.NativeStart.main(Native Method)
10-08 09:23:10.161: E/AndroidRuntime(4706): Caused by: java.lang.ClassNotFoundException: com.praktikum.androidcrestclient.LineGraph in loader dalvik.system.PathClassLoader[/data/app/com.praktikum.androidcrestclient-1.apk]
10-08 09:23:10.161: E/AndroidRuntime(4706): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
10-08 09:23:10.161: E/AndroidRuntime(4706): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
10-08 09:23:10.161: E/AndroidRuntime(4706): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
10-08 09:23:10.161: E/AndroidRuntime(4706): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
10-08 09:23:10.161: E/AndroidRuntime(4706): ... 11 more
10-08 09:23:10.180: W/ActivityManager(89): Force finishing activity com.praktikum.androidcrestclient/.LineGraph
10-08 09:23:10.180: W/ActivityManager(89): Force finishing activity com.praktikum.androidcrestclient/.MainActivity
10-08 09:23:10.690: W/ActivityManager(89): Activity pause timeout for HistoryRecord{4094eea0 com.praktikum.androidcrestclient/.LineGraph}
10-08 09:23:12.330: I/Process(4706): Sending signal. PID: 4706 SIG: 9
10-08 09:23:12.350: I/ActivityManager(89): Process com.praktikum.androidcrestclient (pid 4706) has died.
10-08 09:23:12.360: E/InputDispatcher(89): channel '4065ae98 com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x8
10-08 09:23:12.360: E/InputDispatcher(89): channel '4065ae98 com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
10-08 09:23:12.490: I/WindowManager(89): WIN DEATH: Window{4065ae98 com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.MainActivity paused=true}
10-08 09:23:12.500: I/WindowManager(89): WIN DEATH: Window{406c1140 Toast paused=false}
10-08 09:23:12.600: W/InputManagerService(89): Got RemoteException sending setActive(false) notification to pid 4706 uid 10034
10-08 09:23:12.660: E/InputDispatcher(89): Received spurious receive callback for unknown input channel. fd=168, events=0x8
10-08 09:23:16.820: D/dalvikvm(396): GC_EXPLICIT freed 7K, 54% free 2537K/5511K, external 1625K/2137K, paused 43ms
10-08 09:23:21.626: W/ActivityManager(89): Activity destroy timeout for HistoryRecord{4094e768 com.praktikum.androidcrestclient/.MainActivity}
10-08 09:23:21.626: W/ActivityManager(89): Activity destroy timeout for HistoryRecord{4094eea0 com.praktikum.androidcrestclient/.LineGraph}
10-08 09:23:21.900: D/dalvikvm(299): GC_EXPLICIT freed 12K, 55% free 2589K/5703K, external 1625K/2137K, paused 73ms
10-08 09:23:26.950: D/dalvikvm(407): GC_EXPLICIT freed 4K, 55% free 2532K/5511K, external 1625K/2137K, paused 57ms
10-08 09:24:54.097: D/SntpClient(89): request time failed: java.net.SocketException: Address family not supported by protocol
10-08 09:29:54.106: D/SntpClient(89): request time failed: java.net.SocketException: Address family not supported by protocol
10-08 09:34:54.130: D/SntpClient(89): request time failed: java.net.SocketException: Address family not supported by protocol
Can you please help me to find why it doesn't find this other activity.
Thank you
Answer
Change the name of your class to "LineGraph" instead of "lineGraph" in this declaration:
public class LineGraph extends Activity{