Hello.
When I click on a button in my app, I get a "Class file editor/source not
found" message. I'm not sure why this is a problem because I have other
buttons that do the same thing (start an activity) and they do not have this
problem. If anyone has suggestions, it would be much appreciated!
Below is the logcat out put and the code/xml involved:
Button code:
next1btn = (Button) findViewById(R.id.next1btn);
next1btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(TakePic.this, Tag.class));
}
});
Button xml:
<Button android:id="@+id/next1btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Next " />
AndroidManifest.xml intent:
<activity android:name=".Geotag"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
</intent-filter>
</activity>
Tag.java:
package net.tiny.racker;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class Tag extends Activity {
Button tagbtn = null;
Button next2btn = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Tagbtn = (Button) findViewById(R.id.tagbtn);
Tagbtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(Tag.this, "Tag coming soon", 5000).show();
}
});
next2btn = (Button) findViewById(R.id.next2btn);
next2btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(Tag.this, Guide.class));
}
});
}
}
Logcat:
08-28 00:03:00.637: INFO/ActivityManager(50): Starting activity: Intent {
comp={net.tiny.racker/net.tiny.racker.Tag} }
08-28 00:03:00.678: DEBUG/AndroidRuntime(242): Shutting down VM
08-28 00:03:00.687: WARN/dalvikvm(242): threadid=3: thread exiting with
uncaught exception (group=0x4000fe68)
08-28 00:03:00.687: ERROR/AndroidRuntime(242): Uncaught handler: thread main
exiting due to uncaught exception
08-28 00:03:00.707: ERROR/AndroidRuntime(242): java.lang.RuntimeException:
Unable to start activity ComponentInfo{net.tiny.racker/net.tiny.racker.Tag}:
java.lang.NullPointerException
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2141)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2157)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.ActivityThread.access$1800(ActivityThread.java:112)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1581)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.os.Handler.dispatchMessage(Handler.java:88)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.os.Looper.loop(Looper.java:123)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.ActivityThread.main(ActivityThread.java:3739)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
java.lang.reflect.Method.invokeNative(Native Method)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
java.lang.reflect.Method.invoke(Method.java:515)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:7
39)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
dalvik.system.NativeStart.main(Native Method)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): Caused by:
java.lang.NullPointerException
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
net.tiny.racker.Tag.onCreate(Tag.java:19)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1122)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2104)
08-28 00:03:00.707: ERROR/AndroidRuntime(242): ... 11 more
--
:-)
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