What i am trying to do :: i am displaying images in gridview
What is happening:: getting a null-pointer-exception at
flagNameId = (TextView) base.findViewById(R.id.flagNameId);
I have the id's referenced properly, still there comes exception, how can i resolve this
CustomGrid.java
public class CustomGrid extends BaseAdapter{
private Context mContext;
LinkedList<LinkedHashMap<String, Integer>> messengerListObject;
public CustomGrid(Context _mContext,LinkedList<LinkedHashMap<String, Integer>> _messengerListObject) {
messengerListObject=_messengerListObject;
mContext=_mContext;
}
@Override
public int getCount() {
return messengerListObject.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
class ViewHolder {
public TextView flagNameId;
public ImageView flagImgId;
public ViewHolder(View base) {
flagNameId = (TextView) base.findViewById(R.id.flagNameId);
flagImgId = (ImageView) base.findViewById(R.id.flagImgId);
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
String countryName = "";
int countryFlag = 0;
ViewHolder vHolder;
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vHolder = new ViewHolder(view);
if (convertView == null) {
vHolder = new ViewHolder(view);
view = inflater.inflate(R.layout.grid_single, null);
view.setTag(vHolder);
} else {
vHolder = (ViewHolder) view.getTag();
}
HashMap<String, Integer> messengerMapObject= messengerListObject.get(position);
for (Entry<String, Integer> entry : messengerMapObject.entrySet()) {
countryFlag = entry.getValue();
vHolder.flagNameId.setText(entry.getKey());
vHolder.flagImgId.setImageResource(entry.getValue());
}
return view;
}
}
MainActivity.java
public class MainActivity extends Activity {
GridView grid;
LinkedList<LinkedHashMap<String, Integer>> messengerListObject;
LinkedHashMap<String, Integer> messengerMapObject;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
grid=(GridView) findViewById(R.id.grid);
messengerListObject=new LinkedList<LinkedHashMap<String, Integer>>();
messengerMapObject=new LinkedHashMap<String, Integer>();
//Add the data
messengerMapObject.put("Canada", R.drawable.canada);
messengerMapObject.put("China", R.drawable.china);
messengerMapObject.put("England", R.drawable.england);
messengerMapObject.put("Holland", R.drawable.holland);
messengerMapObject.put("India", R.drawable.india);
messengerMapObject.put("Russia", R.drawable.russia);
messengerMapObject.put("Spain", R.drawable.spain);
messengerMapObject.put("Usa", R.drawable.usa);
messengerListObject.add(messengerMapObject);
CustomGrid adapter = new CustomGrid(MainActivity.this,messengerListObject);
grid.setAdapter(adapter);
/*grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(adapter);
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
}
});*/
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<GridView
android:id="@+id/grid"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:divider="@null"
android:listSelector="#00000000"
android:numColumns="auto_fit" />
</LinearLayout>
grid_single.xml
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#222222"
android:orientation="vertical"
android:padding="10dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#E6E6E6"
android:orientation="vertical" >
<ImageView
android:id="@+id/grid_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:scaleType="fitXY"
android:src="@drawable/eleven" >
</ImageView>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:orientation="vertical" >
<TextView
android:id="@+id/grid_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Text"
android:textSize="12sp" >
</TextView>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</TableLayout>
Log::
07-31 11:25:33.365: E/AndroidRuntime(7963): FATAL EXCEPTION: main
07-31 11:25:33.365: E/AndroidRuntime(7963): java.lang.NullPointerException
07-31 11:25:33.365: E/AndroidRuntime(7963): at com.example.grid.CustomGrid$ViewHolder.<init>(CustomGrid.java:46)
07-31 11:25:33.365: E/AndroidRuntime(7963): at com.example.grid.CustomGrid.getView(CustomGrid.java:60)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.AbsListView.obtainView(AbsListView.java:2033)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.GridView.onMeasure(GridView.java:1026)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.View.measure(View.java:12603)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1017)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.LinearLayout.onMeasure(LinearLayout.java:555)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.View.measure(View.java:12603)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.View.measure(View.java:12603)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.View.measure(View.java:12603)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-31 11:25:33.365: E/AndroidRuntime(7963): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.View.measure(View.java:12603)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1044)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.os.Handler.dispatchMessage(Handler.java:99)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.os.Looper.loop(Looper.java:137)
07-31 11:25:33.365: E/AndroidRuntime(7963): at android.app.ActivityThread.main(ActivityThread.java:4340)
07-31 11:25:33.365: E/AndroidRuntime(7963): at java.lang.reflect.Method.invokeNative(Native Method)
07-31 11:25:33.365: E/AndroidRuntime(7963): at java.lang.reflect.Method.invoke(Method.java:511)
07-31 11:25:33.365: E/AndroidRuntime(7963): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-31 11:25:33.365: E/AndroidRuntime(7963): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-31 11:25:33.365: E/AndroidRuntime(7963): at dalvik.system.NativeStart.main(Native Method)
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