how do i read my .txt file into a list view-Collection of common programming errors
I am trying to read lines stored in a separate txt file into my android application and have each line show up in the list view. The problem is though i cannot get anything to appear despite the fact my code says their are not errors in it. As you read this code, i will clarify right now that my list view is named “addresslist” and the file im reading from is named “myaddress.txt”. I appriciate any help i can get. Thank you.
ListView listView= (ListView) findViewById(R.id.addresslist);
try{
InputStream instream = openFileInput("myaddress.txt");
InputStreamReader inputreader = new InputStreamReader(instream);
BufferedReader buffreader = new BufferedReader(inputreader);
ArrayList lines = new ArrayList();
boolean hasNextLine =true;
while (hasNextLine){
String line = buffreader.readLine();
lines.add(line);
hasNextLine = line != null;
}
ArrayAdapter adapter = new ArrayAdapter(this,R.id.addresslist,lines);
listView.setAdapter(adapter);
instream.close();
}
catch(java.io.FileNotFoundException e){
}catch(java.io.IOException e){
}
}
with the log erros
12-08 01:21:30.394: E/Trace(1500): [ 12-08 01:21:30.864 1500: 1500 V/Home to School 4828 N. Crescent Norridge IL 60706, 5500 N St Louis Avenue Chicago IL 60625; Home to School 4828 N. Crescent Norridge IL 60706, 5500 N St Louis Avenue Chicago IL 60625; 12-08 01:21:30.864: D/AndroidRuntime(1500): Shutting down VM 12-08 01:21:30.924: W/dalvikvm(1500): threadid=1: thread exiting with uncaught exception (group=0xb3e92288) 12-08 01:21:30.944: E/AndroidRuntime(1500): FATAL EXCEPTION: main 12-08 01:21:30.944: E/AndroidRuntime(1500): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tripapp/com.tripapp.Frontpage}: java.lang.NullPointerException: println needs a message 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.ActivityThread.access$600(ActivityThread.java:130) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.os.Handler.dispatchMessage(Handler.java:99) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.os.Looper.loop(Looper.java:137) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.ActivityThread.main(ActivityThread.java:4745) 12-08 01:21:30.944: E/AndroidRuntime(1500): at java.lang.reflect.Method.invokeNative(Native Method) 12-08 01:21:30.944: E/AndroidRuntime(1500): at java.lang.reflect.Method.invoke(Method.java:511) 12-08 01:21:30.944: E/AndroidRuntime(1500): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 12-08 01:21:30.944: E/AndroidRuntime(1500): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 12-08 01:21:30.944: E/AndroidRuntime(1500): at dalvik.system.NativeStart.main(Native Method) 12-08 01:21:30.944: E/AndroidRuntime(1500): Caused by: java.lang.NullPointerException: println needs a message 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.util.Log.println_native(Native Method) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.util.Log.v(Log.java:117) 12-08 01:21:30.944: E/AndroidRuntime(1500): at com.tripapp.Frontpage.onCreate(Frontpage.java:61) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.Activity.performCreate(Activity.java:5008) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 12-08 01:21:30.944: E/AndroidRuntime(1500): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 12-08 01:21:30.944: E/AndroidRuntime(1500): … 11 more