I need to set the child view as center of the ViewPager and also I would like to show some part of the next and previous views to the current view sides(like current screen below 1). But currently the current view is starting at left side of the ViewPager(like expected screen below 2). How can I achieve that?
Here is my code..
MyViewPagerAdapter
public class MyViewPagerAdapter extends PagerAdapter {
private Activity mActivity;
private int mPageCount;
public MyViewPagerAdapter(Activity activity,int pageCount) {
mActivity = activity;
mPageCount = pageCount;
}
@Override
public int getCount() {
return mPageCount;
}
@Override
public boolean isViewFromObject(View view, Object obj) {
return (view ==(View)obj);
}
@Override
public Object instantiateItem(ViewGroup container,final int position) {
ViewGroup viewGroup = (ViewGroup)mActivity.getLayoutInflater().inflate(
R.layout.item_view, null);
viewGroup.setBackgroundColor(randomColor());
TextView textView = (TextView)viewGroup.findViewById(R.id.textView1);
textView.setText("Page: "+(position+1));
Button button = (Button) viewGroup.findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mActivity, "Hey, Its clicked!!! at page "+(position+1), Toast.LENGTH_LONG).show();
}
});
container.addView(viewGroup);
return viewGroup;
}
Random rnd = new Random();
private int randomColor(){
return Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
}
@Override
public void destroyItem(ViewGroup collection, int position, Object view) {
//must be overridden else throws exception as not overridden.
Log.d("Tag", collection.getChildCount()+"");
collection.removeView((View) view);
}
@Override
public float getPageWidth(int position) {
return 0.8f;
}
}
MainActivity
public class MainActivity extends Activity {
private ViewPager viewPager;
LinearLayout linearLayout;
private int ID = 100;
private final int count = 8;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewPager);
linearLayout = (LinearLayout) findViewById(R.id.indicator_layout);
generateIndicators(count);
MyViewPagerAdapter adapter = new MyViewPagerAdapter(this, count);
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
int oldPosition = 0;
@Override
public void onPageSelected(int position) {
//this changes the old position's view state image
((TextView)linearLayout.getChildAt(oldPosition)).setText("");
oldPosition = position;
//this changes the current position's view state image
((TextView)linearLayout.getChildAt(position)).setText((position+1)+"");
}
//this method will be called repeatedly upto another item comes as front one(active one)
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
//this will be called as per scroll state
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
viewPager.setOffscreenPageLimit(4);
}
private void generateIndicators(int count) {
/// Converts 14 dip into its equivalent px
int padd = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 3, getResources().getDisplayMetrics());
for(int i=0;i<count;i++){
TextView textView = new TextView(this);
textView.setId(ID+i);
final int currentItem = i;
textView.setBackgroundResource(R.drawable.white_cell);
textView.setPadding(padd,padd,padd,padd);
/// Converts 14 dip into its equivalent px
int size = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics());
textView.setTextSize(size);
textView.setGravity(Gravity.CENTER);
/// Converts 14 dip into its equivalent px
int px = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 30, getResources().getDisplayMetrics());
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(px, px);
linearLayout.addView(textView,params);
}
((TextView)linearLayout.getChildAt(0)).setText("1");
}
}
activity_main.xml
<RelativeLayout 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" >
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="@+id/indicator_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="19dp" >
</LinearLayout>
</RelativeLayout>
item_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="match_parent"
android:id="@+id/root_view"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="click me" />
</LinearLayout>
Current screen
expected screen
