Android : Locating the item at center position of the screen after selecting it ,In the horizontalscrollview
10,964
Solution 1
After long try , I have got it with this
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);
}
Solution 2
This is how your onCreate should look like:
hsl = (HorizontalScrollView) findViewById(R.id.scrollView);
LinearLayout ll = (LinearLayout) findViewById(R.id.horizontalbar);
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
final int width = size.x;
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 center = (width - b.getWidth())/2;
hsl.scrollTo(b.getLeft() - center, b.getTop());
}
});
ll.addView(b);
}
The only thing i didn't discover is why i need to substract additional 200px (in my case). Probably some padding or something else. Instead of 200, you could discover how many dips is it and call function:
public static int convertDipToPixels(Context c, float dips) {
return (int) (dips * c.getResources().getDisplayMetrics().density + 0.5f);
}
![Mayur Raval](https://i.stack.imgur.com/2paTK.jpg?s=256&g=1)
Comments
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Mayur Raval almost 2 years
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
after click
How can I Scroll that selected item to the middle in HorizontalScrollview?