Mayur Raval Mayur Raval - 4 months ago 23
Android Question

Android : Locating the item at center position of the screen after selecting it ,In the horizontalscrollview

I am trying to scroll item to the middle position of the screen after selecting it.I have used Horizontalscrollview and LinearLayout inside it to add item. I show in the XML

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"
android:orientation="vertical"
tools:context=".MainActivity" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/bottom"
android:orientation="vertical" >

<HorizontalScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/updown"
android:layout_weight="0.8"
android:fadingEdgeLength="0dp" >

<LinearLayout
android:id="@+id/horizontalbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/tlbackground"
android:baselineAligned="true"
android:orientation="horizontal" >
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
</RelativeLayout>


Class

public class MainActivity extends FragmentActivity implements ActionBar.TabListener
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
hsl = (HorizontalScrollView) findViewById(R.id.scrollView);
LinearLayout l1 = (LinearLayout)findViewById(R.id.horizontalbar);

for(int i = 0; i < 20; i++)
{
Button b = new Button(this);
b.setText("t"+i);
ll.addView(b);
}
}
}


I want something like in figure

before click

enter image description here

after click

enter image description here

How can I Scroll that selected item to the middle in HorizontalScrollview?

Answer Source

After long try , I have got it, Which code is shown below

for (int i = 0; i < 20; i++) {
final Button b = new Button(this);
b.setText("t" + i);
b.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
       int scrollX = (b.getLeft() - (screenWidth / 2)) + (b.getWidth() / 2);
       hsl.smoothScrollTo(scrollX, 0);
    }
});

ll.addView(b);
}