getContentLength() returning -1

Android url connection getContentLength() returning negative value (-1) ?

SOLUTION
(ÇÖZÜM)

add this line 
(Bu satırı ekle)

urlConnection.setRequestProperty("Accept-Encoding","identiy");
.
.
.
as it's shown below
(aşağıda gösterildiği gibi)

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestProperty("Accept-Encoding","identiy"); // <--- Add this
int length = urlConnection.getContentLength();

To get Certificate fingerprint(MD5) (Parmak izi sertifikası nasıl alınır) for android

cd C:\Program Files\Java\jdk1.7.0_79 (note jdk version might be different in your pc )(Kodu yazın)

keytool -exportcert -alias androiddebugkey -keystore "C:\Users\userName\.android\debug.keystore" -list -v (Kodu yazın)

If it asks keystore password it's default  " android " type it ok (Şifre sorarsa "android" yazın )

Ok! you are done results are displayed for you (Tamamdır sonuçlar ekranda görüntülenecek)

how to run the key hash for facebook

To get android key hash for facebook app (Facebook app için android key hash nasıl alınır) 

• Download open ssl for windows here (dosyayı indirin)
• Unzip it  to C drive as "openssl " file (Dosyayı "openssl" olarak C sürücüsüne çıkartın)
• Open cmd prompt(Komut istemini açın)
• Type cd C:\Program Files\Java\jdk1.7.0_79\bin (note jdk version might be different in your pc)(komutu yazın- jdk version sizde farklı olabilir ayrıca bakın)
• And Finally type keytool -export -alias myAlias -keystore C:\Users\your user name\.android\myKeyStore | C:\openssl\bin\openssl sha1 -binary | C:\openssl\bin\openssl enc -a -e(Kodu yazın)
• If it asks keystore password it's default  " android " type it ok (Şifre sorarsa "android" yazın )
• You are done!  ( Bitti ! )

android.content.res.Resources$NotFoundException:

" FATAL EXCEPTION: main
                  android.content.res.Resources$NotFoundException: String resource ID #0x4
                      at android.content.res.Resources.getText "

This exception occours Even when the resource is presents 

It's most likely setting anything except string in text like here;
(Büyük ihtimalle setText() ederken aldığı değer string değil örnek;)

 int i=10;
mtextView.setText(i);

 it gets error above.It should be converted to string
(Yukarıdaki hatalı.Değerin tipi stringe çevirilmelidir)

SOLUTION:

 mtextView.setText(String.valueOf(i))

parent.getChildAt(positon) returns null visible child çözüldü

listview.getChildAt(positon) returns null  hatasının çözümü

Aşağıdaki kodu listivew içinde yazın

View view;

int firstPos = listview.getFirstVisiblePosition();
int wantedPos = position - firstPos;

if ((wantedPos >= 0) && (wantedPos <= listview.getChildCount())
{
 view =listview.getChildAt(wantedPos);
 if (view == null){
  return;}
else{
 //  burada  view ' ı kullanın  }
}

ConcurrentModificationException for ArrayList

ConcurrentModificationException for ArrayList Error

Böyle bir for döngüsü kullanıyorsanız
for (iterable_type iterable_element : iterable)
       {
}
Yerine

 for (int i = 0; i < array.length; i++) {

}
bu for döngüsünü kullanın sorun ortdan kalkacaktır




ConcurrentModificationException    occurs when using iterators

Unmarshalling unknown type code error(Parcel)

How to fix Unmarshalling unknown type code xxx at ofset

RuntimeException -Unmarshalling unknown type

Bunun nedeni çok saçma ama read ve write sıralanması aynı olmamasından kaynaklanan bir hata örnek aşagıdaki gibi;

This can be caused by data being read in a different order than it's
been written. For example:

WRONG

parcel.writeInt(...)
parcel.writeString()

...

parcel.readString()
parcel.readInt()

CORRECT

parcel.writeString(...)
parcel.writeInt()

...

parcel.readString()
parcel.readInt()

android adapter reuse view problem

List Vİew reusing view when ... I dont want it to..

,Handling ListView Recycle on Android

just adding following codes to your adapter so get rid of the damn it :-)

@Override

    public int getItemViewType(int position) {

        // Define a way to determine which layout to use, here it's just evens and odds.

        return position ;

    }

    @Override

    public int getViewTypeCount() {

        return getCount();

    }

Android No view found for id, for fragment çözüldü java.lang.IllegalArgumentException:

Muhmetemelen child fragment dan fragment çağırıyosunuz bu genelde de tabhost kullanırken başka frame layout  kullanılır onun içindeki child fragmentden başka fragment geçmek isterkende  activity üzerinde ki frame layout yani diger frame loyout   referans gösteririz bu durumda da bu hata (No view found for id, for fragment) ile karşılaşılır

Çözüm

FragmentTransaction ft = getChildFragmentManager().beginTransaction();

FragmentTransaction ft = getFragmentManager().beginTransaction();

yerine

FragmentTransaction ft = getActivity().getFragmentManager().beginTransaction();
FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
 kullanmanız gerekir.  :))
getActivity() ile referansınızın yolunu belirtmiş olursunuz... 

tabhost with fragment (changeable tab underline color etc.) in fragment Android

 1. MainFragment oluşturalım aşagıdaki  kodu ekleyin .

Mavi yazılı kodlardaki kodlar color renklerini tutan degişkenlerdir.Bunlar
  tabhostun arkaplan renklerini
  child tabların renklerini
  altçizgi rengini
  tıklanan textin rengini
  tıklanmayan textin rengini   tutar
Dilediginiz renk kodlarını yazarak değiştirebilirsiniz

import java.util.ArrayList;

import android.R.color;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.TabHost;
import android.widget.TabWidget;
import android.widget.TextView;
public class MainFragment extends Fragment{

     TabManager mTabManager;
     private static  View myvidget;
     private static TabWidget widget;
   //tıklanmayan tabın text colorı
  private static String UnselectedTabTitleColor="#d9d9d9";
  //tıklanan tabın text colorı
  private static String selectedTabTitleColor="#FFFFFF";
  //tabın arkaplan  colorı
  private String tab_color="#008b9d";
  //child tabın arkaplan  colorı
  private String child_tab="#FFFFFF";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mTabManager = new TabManager(getActivity(), getChildFragmentManager(),
                R.id.realtabcontent);
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.mainfragment, container, false);
        TabHost host = mTabManager.handleCreateView(v);
        mTabManager.addTab(host.newTabSpec("tab1").setIndicator("tab1"),
                TabFirstFragment.class, null);
        mTabManager.addTab(host.newTabSpec("tab2").setIndicator("tab2"),
                TabSecondFragment.class, null);
        mTabManager.addTab(host.newTabSpec("tab3").setIndicator("tab3"),
               TabThirdFragment.class, null);
     
      widget = host.getTabWidget();
      TextView tv ;
        for(int i = 0; i < widget.getChildCount(); i++) {
             myvidget = widget.getChildAt(i);
         
            // Look for the title view to ensure this is an indicator and not a divider.
             tv = (TextView)myvidget.findViewById(android.R.id.title);
            tv.setGravity(Gravity.CENTER);
          //ilk yüklendiğinde ilk tabın texteki varsayılan color ı
            tv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
         
            LayoutParams params = tv.getLayoutParams();
            params.height=LayoutParams.MATCH_PARENT;
            params.width=LayoutParams.MATCH_PARENT;
         
           tv.setBackgroundColor(Color.parseColor(tab_color));
            myvidget.setBackgroundColor(Color.parseColor(child_tab));
            myvidget.setPadding(0, 0, 0, 4);
         
         
        }
        //ilk yüklendiğinde ilk tabın varsayılan color ı
        tv=(TextView)widget.getChildAt(0).findViewById(android.R.id.title);
        tv.setTextColor(Color.parseColor(selectedTabTitleColor));
        //ilk yüklendiğinde ilk tabın varsayılan altçizgisi
        myvidget = widget.getChildAt(0);
        myvidget.setPadding(0, 0, 0, 8);
     
     
        return v;
    }
    @Override
    public void onViewStateRestored(Bundle savedInstanceState) {
        super.onViewStateRestored(savedInstanceState);
        mTabManager.handleViewStateRestored(savedInstanceState);
    }
    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mTabManager.handleDestroyView();
    }
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mTabManager.handleSaveInstanceState(outState);
    }
    /**
     * This is a helper class that implements a generic mechanism for
     * associating fragments with the tabs in a tab host.  DO NOT USE THIS.
     * If you want tabs in a fragment, use the support v13 library's
     * FragmentTabHost class, which takes care of all of this for you (in
     * a simpler way even).
     */
    public static class TabManager implements TabHost.OnTabChangeListener {
        private final Context mContext;
        private final FragmentManager mManager;
        private final int mContainerId;
        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
        private TabHost mTabHost;
        private TabInfo mLastTab;
        private boolean mInitialized;
        private String mCurrentTabTag;
        static final class TabInfo {
            private final String tag;
            private final Class<?> clss;
            private final Bundle args;
            private Fragment fragment;
            TabInfo(String _tag, Class<?> _class, Bundle _args) {
                tag = _tag;
                clss = _class;
                args = _args;
            }
        }
        static class DummyTabFactory implements TabHost.TabContentFactory {
            private final Context mContext;
            public DummyTabFactory(Context context) {
                mContext = context;
            }
            @Override
            public View createTabContent(String tag) {
                View v = new View(mContext);
                v.setMinimumWidth(0);
                v.setMinimumHeight(0);
                return v;
            }
        }
        public TabManager(Context context, FragmentManager manager, int containerId) {
            mContext = context;
            mManager = manager;
            mContainerId = containerId;
        }
        public TabHost handleCreateView(View root) {
            if (mTabHost != null) {
                throw new IllegalStateException("TabHost already set");
            }
            mTabHost = (TabHost)root.findViewById(android.R.id.tabhost);
            mTabHost.setup();
            mTabHost.getTabWidget().setDividerDrawable(null);
            mTabHost.setOnTabChangedListener(this);
            return mTabHost;
        }
        public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
            tabSpec.setContent(new DummyTabFactory(mContext));
            String tag = tabSpec.getTag();
            TabInfo info = new TabInfo(tag, clss, args);
            mTabs.add(info);
            mTabHost.addTab(tabSpec);
        }
        public void handleViewStateRestored(Bundle savedInstanceState) {
            if (savedInstanceState != null) {
                mCurrentTabTag = savedInstanceState.getString("tab");
            }
            mTabHost.setCurrentTabByTag(mCurrentTabTag);
            String currentTab = mTabHost.getCurrentTabTag();
            // Go through all tabs and make sure their fragments match
            // the correct state.
            FragmentTransaction ft = null;
            for (int i=0; i<mTabs.size(); i++) {
                TabInfo tab = mTabs.get(i);
                tab.fragment = mManager.findFragmentByTag(tab.tag);
                if (tab.fragment != null && !tab.fragment.isDetached()) {
                    if (tab.tag.equals(currentTab)) {
                        // The fragment for this tab is already there and
                        // active, and it is what we really want to have
                        // as the current tab.  Nothing to do.
                        mLastTab = tab;
                    } else {
                        // This fragment was restored in the active state,
                        // but is not the current tab.  Deactivate it.
                        if (ft == null) {
                            ft = mManager.beginTransaction();
                        }
                        ft.detach(tab.fragment);
                    }
                }
            }
            // We are now ready to go.  Make sure we are switched to the
            // correct tab.
            mInitialized = true;
            ft = doTabChanged(currentTab, ft);
            if (ft != null) {
                ft.commit();
               
                mManager.executePendingTransactions();
            }
        }
        public void handleDestroyView() {
            mCurrentTabTag = mTabHost.getCurrentTabTag();
            mTabHost = null;
            mTabs.clear();
            mInitialized = false;
        }
        public void handleSaveInstanceState(Bundle outState) {
            outState.putString("tab", mTabHost != null
                    ? mTabHost.getCurrentTabTag() : mCurrentTabTag);
        }
        @Override
        public void onTabChanged(String tabId) {
       
            if (!mInitialized) {
           
                return;
            }
            FragmentTransaction ft = doTabChanged(tabId, null);
            if (ft != null) {
                ft.commit();
              drawUnderLine();
             
            }
        }
        private void drawUnderLine(){
        TextView dtv ;
        switch(mTabHost.getCurrentTab()){
       
        case 0:
        myvidget = widget.getChildAt(0);
                 myvidget.setPadding(0, 0, 0, 8);
                 myvidget = widget.getChildAt(1);
                 myvidget.setPadding(0, 0, 0, 4);
                 myvidget = widget.getChildAt(2);
                 myvidget.setPadding(0, 0, 0, 4);
                 dtv=(TextView) mTabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.title);
                 dtv.setTextColor(Color.parseColor(selectedTabTitleColor));
                 dtv=(TextView) mTabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.title);
                 dtv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
                 dtv=(TextView) mTabHost.getTabWidget().getChildAt(2).findViewById(android.R.id.title);
                 dtv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
                       
        break;
        case 1:
        myvidget = widget.getChildAt(0);
                myvidget.setPadding(0, 0, 0, 4);
                myvidget = widget.getChildAt(1);
                myvidget.setPadding(0, 0, 0, 8);
                myvidget = widget.getChildAt(2);
                myvidget.setPadding(0, 0, 0, 4);
                dtv=(TextView) mTabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.title);
                dtv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
                dtv=(TextView) mTabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.title);
                dtv.setTextColor(Color.parseColor(selectedTabTitleColor));
                dtv=(TextView) mTabHost.getTabWidget().getChildAt(2).findViewById(android.R.id.title);
                dtv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
                       
        break;
        case 2:
        myvidget = widget.getChildAt(0);
                myvidget.setPadding(0, 0, 0, 4);
                myvidget = widget.getChildAt(1);
                myvidget.setPadding(0, 0, 0, 4);
                myvidget = widget.getChildAt(2);
                myvidget.setPadding(0, 0, 0, 8);
                dtv=(TextView) mTabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.title);
                dtv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
                dtv=(TextView) mTabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.title);
                dtv.setTextColor(Color.parseColor(UnselectedTabTitleColor));
                dtv=(TextView) mTabHost.getTabWidget().getChildAt(2).findViewById(android.R.id.title);
                dtv.setTextColor(Color.parseColor(selectedTabTitleColor));
        break;
        default:
        break;
       
        }
       
         
       
        }
        private FragmentTransaction doTabChanged(String tabId, FragmentTransaction ft) {
            TabInfo newTab = null;
            for (int i=0; i<mTabs.size(); i++) {
                TabInfo tab = mTabs.get(i);
                if (tab.tag.equals(tabId)) {
                    newTab = tab;
                }
            }
            if (newTab == null) {
                throw new IllegalStateException("No tab known for tag " + tabId);
            }
            if (mLastTab != newTab) {
                if (ft == null) {
                    ft = mManager.beginTransaction();
                }
                if (mLastTab != null) {
                    if (mLastTab.fragment != null) {
                        ft.detach(mLastTab.fragment);
                    }
                }
                if (newTab != null) {
                    if (newTab.fragment == null) {
                        newTab.fragment = Fragment.instantiate(mContext,
                                newTab.clss.getName(), newTab.args);
                        ft.add(mContainerId, newTab.fragment, newTab.tag);
                    } else {
                        ft.attach(newTab.fragment);
                    }
                }
                mLastTab = newTab;
            }
            return ft;
        }
    }
}
-----------------------------------------------------------------------------------------------------------------

 1.1  mainfragment.xml oluşturun aşağıdaki kodu ekleyin

<TabHost
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TabWidget
            android:id="@android:id/tabs"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"/>
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="0"/>
        <FrameLayout
            android:id="@+id/realtabcontent"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>
    </LinearLayout>
</TabHost>

2.1 TabFirstFragment  oluşturun aşagıdaki kodu ekleyin

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class TabFirstFragment  extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v=inflater.inflate(R.layout.tabfirstfragment, container, false);
         return v;
    }

}
2.2 tabfirstfragment oluşturun aşagıdaki  kodu ekleyin 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:background="#d9d9d9">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="tab1"
        android:textAppearance="?android:attr/textAppearanceLarge"/>


</RelativeLayout>
3.1 TabSecondFragment  oluşturun aşagıdaki kodu ekleyin

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class TabSecondFragment  extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v=inflater.inflate(R.layout.tabsecondfragment, container, false);
         return v;
    }

}
3.2 tabsecondfragment oluşturun aşagıdaki  kodu ekleyin 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:background="#d9d9d9">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="tab2"
        android:textAppearance="?android:attr/textAppearanceLarge"/>


</RelativeLayout>
4.1 TabThirdFragment  oluşturun aşagıdaki kodu ekleyin

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class TabThirdFragment  extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v=inflater.inflate(R.layout.tabthirdfragment, container, false);
         return v;
    }

}
2.2 tabthirdfragment oluşturun aşagıdaki  kodu ekleyin 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:background="#d9d9d9">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="tab3"
        android:textAppearance="?android:attr/textAppearanceLarge"/>


</RelativeLayout>

Remove shadow below actionbar android

 res/style.xml  açın.Eksik olanı ekleyin

Eger Light yazıyorsa  silin
Theme.AppCompat.Light

 Android 5.0 için;

<item name="android:elevation">0dp</item>

Support library compatibility için;

<item name="elevation">0dp</item>

kullanın.

--------------------------------------------------------------------------------------------------------------------------
<style name="AppBaseTheme" parent="Theme.AppCompat">
   
      <item name="elevation">0dp</item>

    </style>
<style name="AppTheme" parent="AppBaseTheme">
     
         <item name="android:windowContentOverlay">@null</item>
    </style>
--------------------------------------------------------------------------------------------------------------------------
Androidmanifest dosyasını açın orada application  taglari içinde olan   android:theme="@style/AppTheme"  olarak degiştirin