I am having an issue when trying to access a remote database. This issue only occurs on ICS or above, but runs perfectly fine on older Android. I can’t figure this one out for the life of me, and have been stuck on it for weeks. I really need to figure this out so I can then use the solution here in another app of mine that is far more important.
Any help would be greatly appreciated. If more information is needed, just let me know.
Now the app wont even launch, getting the following when launch:
11-30 15:42:46.970: W/dalvikvm(10028): threadid=1: thread exiting with uncaught exception (group=0x40d04210)
11-30 15:42:46.970: E/AndroidRuntime(10028): FATAL EXCEPTION: main
11-30 15:42:46.970: E/AndroidRuntime(10028): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.defsoftsol.db.check/com.defsoftsol.db.check.MainActivity}: java.lang.NullPointerException
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.ActivityThread.access$600(ActivityThread.java:123)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.os.Handler.dispatchMessage(Handler.java:99)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.os.Looper.loop(Looper.java:137)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.ActivityThread.main(ActivityThread.java:4428)
11-30 15:42:46.970: E/AndroidRuntime(10028): at java.lang.reflect.Method.invokeNative(Native Method)
11-30 15:42:46.970: E/AndroidRuntime(10028): at java.lang.reflect.Method.invoke(Method.java:511)
11-30 15:42:46.970: E/AndroidRuntime(10028): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
11-30 15:42:46.970: E/AndroidRuntime(10028): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
11-30 15:42:46.970: E/AndroidRuntime(10028): at dalvik.system.NativeStart.main(Native Method)
11-30 15:42:46.970: E/AndroidRuntime(10028): Caused by: java.lang.NullPointerException
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.Activity.findViewById(Activity.java:1794)
11-30 15:42:46.970: E/AndroidRuntime(10028): at com.defsoftsol.db.check.MainActivity.<init>(MainActivity.java:43)
11-30 15:42:46.970: E/AndroidRuntime(10028): at java.lang.Class.newInstanceImpl(Native Method)
11-30 15:42:46.970: E/AndroidRuntime(10028): at java.lang.Class.newInstance(Class.java:1319)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
11-30 15:42:46.970: E/AndroidRuntime(10028): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
11-30 15:42:46.970: E/AndroidRuntime(10028): ... 11 more
UPDATED CODE: (Now the code for entire app)
public class MainActivity extends Activity {
String deviceID="",dateStamp="",buff="",db_id="",db_device_id="",db_install_date="";
byte[] data;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
InputStream inputStream;
List<NameValuePair> nameValuePairs;
int ID,activeinstalls;
long diff;
TableLayout tl=(TableLayout)findViewById(R.id.db_data);
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button refresh = (Button)findViewById(R.id.btnrefresh);
refresh.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new MyAsyncTask(MainActivity.this).execute();
}
});
}
@SuppressWarnings("unused")
public class MyAsyncTask extends AsyncTask<Void, Void, Void>
{
ProgressDialog mProgressDialog;
private Context context;
public MyAsyncTask(Context context) {
this.context = context;
}
@Override
protected void onPostExecute(Void result) {
mProgressDialog.dismiss();
}
@Override
protected void onPreExecute() {
mProgressDialog = ProgressDialog.show(MainActivity.this, "Loading...", "Data is Loading...");
}
@Override
protected Void doInBackground(Void... params) {
update();
return null;
}
}
private final SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
private final long ONE_DAY = 24 * 60 * 60 * 1000;
@SuppressWarnings("unused")
public void update()
{
int activeinstalls = 0;
Date now = new Date();
dateStamp = formatter.format(now);
runOnUiThread(new Runnable(){
@Override
public void run(){
UISetup();
}
});
ID = 1;
try
{
do
{
try
{
httpclient = new DefaultHttpClient();
httppost = new HttpPost("http://#.#.#.#/***.php"); //Address cut for server security
nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("_id", String.valueOf(ID)));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httppost);
inputStream = response.getEntity().getContent();
data = new byte[256];
buffer = new StringBuffer();
int len = 0;
while (-1 != (len = inputStream.read(data)) )
{
buffer.append(new String(data, 0, len));
}
inputStream.close();
} catch (Exception e) {
Toast.makeText(MainActivity.this, "error"+e.toString(), Toast.LENGTH_LONG).show();
e.printStackTrace();
}
if(buffer.charAt(0)=='Y')
{
ID++;
buff = buffer.toString();
db_id = buff.substring(1, buff.indexOf("."));
db_device_id = buff.substring(buff.indexOf(".")+1, buff.indexOf(","));
db_install_date = buff.substring(buff.indexOf(",")+1, buff.length());
Date before = null;
try {
before = (Date)formatter.parse(db_install_date);
} catch (ParseException e) {
e.printStackTrace();
}
diff = now.getTime() - before.getTime();
runOnUiThread(new Runnable(){
@Override
public void run(){
UIAdd(diff,db_id,db_device_id,db_install_date);
}
});
} else { //IF buffer returns N
// TODO: Fill in
}
} while(buffer.charAt(0)=='Y');
UIFinish();
} catch(Exception err) {
err.printStackTrace();
}
}
@SuppressWarnings("deprecation")
public void UISetup()
{
tl.removeAllViews();
dbline();
TableRow titr = new TableRow(this);
titr.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
TextView dbid0 = new TextView(this);
TextView dbdevid0 = new TextView(this);
TextView dbindate0 = new TextView(this);
dbid0.setText("| " + "_id");
dbdevid0.setText("| " + "device_id");
dbindate0.setText("| "+ "install_date"+" |");
titr.addView(dbid0);
titr.addView(dbdevid0);
titr.addView(dbindate0);
tl.addView(titr, new TableLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
dbline();
}
@SuppressWarnings("deprecation")
public void UIAdd(long diffr, String dbidn,String did,String idate)
{
long days;
days = diffr / ONE_DAY;
TableRow tr = new TableRow(this);
tr.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
TextView dbid = new TextView(this);
TextView dbdevid = new TextView(this);
TextView dbindate = new TextView(this);
dbid.setText("| " + dbidn);
dbdevid.setText("| " + did);
dbindate.setText("| " + idate+" |");
if(days <= 7)
{
activeinstalls++;
if(days <= 3)
{
dbid.setTextColor(Color.GREEN);
dbdevid.setTextColor(Color.GREEN);
dbindate.setTextColor(Color.GREEN);
} else {
dbid.setTextColor(Color.MAGENTA);
dbdevid.setTextColor(Color.MAGENTA);
dbindate.setTextColor(Color.MAGENTA);
}
} else {
dbid.setTextColor(Color.RED);
dbdevid.setTextColor(Color.RED);
dbindate.setTextColor(Color.RED);
}
tr.addView(dbid);
tr.addView(dbdevid);
tr.addView(dbindate);
tl.addView(tr, new TableLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
}
public void UIFinish()
{
dbline();
TextView te = (TextView)findViewById(R.id.totalentries);
te.setText(String.valueOf(ID-1));
TextView au = (TextView)findViewById(R.id.activeusers);
au.setText(String.valueOf(activeinstalls));
}
@SuppressWarnings("deprecation")
public void dbline()
{
TableLayout tl=(TableLayout)findViewById(R.id.db_data);
TableRow tr = new TableRow(this);
tr.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
TextView dbid = new TextView(this);
TextView dbdevid = new TextView(this);
TextView dbindate = new TextView(this);
dbid.setText("+---------");
dbdevid.setText("+-------------------------------");
dbindate.setText("+--------------------+");
tr.addView(dbid);
tr.addView(dbdevid);
tr.addView(dbindate);
tl.addView(tr, new TableLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
}
}
You get an Exception in the try block, and don’t initialize buffer. That’s why you get the Null pointer.
You should put everything in the try-catch. Or think better about how to handle it.
And, you also should output the error from the try catch in the console. And show it to us. We can look at it.