I'm new to android development hence actual code is appreciated. thanks in advance.
Here's my code. I'm using Viewpager.
@Override
public boolean onOptionsItemSelected(MenuItem item) {
BitmapDrawable btmpdraw = (BitmapDrawable) imgflag.getDrawable();
Bitmap btmp = btmpdraw.getBitmap();
File cache = getApplicationContext().getExternalCacheDir();
File sharefile = new File(cache, "toshare.png");
try {
FileOutputStream out = new FileOutputStream(sharefile);
btmp.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
} catch (IOException e) {
}
Here's my logcat:
E/AndroidRuntime: FATAL EXCEPTION: main Process: kokamapps.viewpagertutorial, PID: 2049 java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.widget.ImageView.getDrawable()' on a null object reference at kokamapps.viewpagertutorial.MainActivity.onOptionsItemSelected(MainActivity.java:75) at android.app.Activity.onMenuItemSelected(Activity.java:2967) at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:403) at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:189) at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:100) at android.support.v7.app.AppCompatDelegateImplV7.onMenuItemSelected(AppCompatDelegateImplV7.java:663) at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811) at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:948) at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:618) at android.support.v7.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:139) at android.view.View.performClick(View.java:4794) at android.view.View$PerformClick.run(View.java:19905) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:139) at android.app.ActivityThread.main(ActivityThread.java:5298) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
