Horizontal scrolling grid view

Question

I know it is not possible in Android to scroll grid view horizontally. But what I am doing is adding image buttons dynamically inside horizontal scroll view like this:

public class HorizontalScroller extends Activity {
    static int l=0;
     private Rect mTempRect = new Rect();

    static int r1=0;
    static int t=0;
    static int b=0;
    static int x=0;
    static int y=0;
 //Button[]  b1 = new Button[100];
    ImageButton btn[][] = new ImageButton[10][10];

 //ImageButton b1 = new ImageButton(this);
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LinearLayout rl = (LinearLayout)findViewById(R.id.widget92);

        LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);

        for(int i=0;i<4;i++)
        {
            for(int j=0;j<10;j++)
            {System.out.println("helo");
        /*      l=l+100;
                r1=r1+100;
                t=t+100;
                b=b+100;*/
            //button();
       //ImageButton btn=new ImageButton(this);
   /*    Rect r = mTempRect;
           r.left=10;
           r.top=10;
           r.right=10;
           r.bottom=10;
       btn[i][j].getDrawingRect(r);*/

            //btn[i][j].setId(j);

              Rect r = mTempRect;
              r.set(0,0,0,0);
              Rect r2 = mTempRect;
              r2.set(0,20,0,20);

                btn[i][j]=new ImageButton(this);
                btn[i][j]. setBackgroundResource(R.drawable.icon);
                btn[i][j].setMinimumWidth(20);
                btn[i][j].setMinimumHeight(20);
                params1.setMargins(5, 5, 5,5); 
                rl.addView(btn[i][j],params1); 

               System.out.println("1="+btn[i][j].getTop());
               System.out.println("2="+btn[i][j].getLeft());
               System.out.println("3="+btn[i][j].getRight());
               System.out.println("4="+btn[i][j].getBottom());
            }
        }
    }
}

but I am getting all image buttons in a single line. How can I implement them in a grid like structure?

Answer 1

Implementing a horizontally scrolling GridView involves copying a few of the Android source code classes into your codebase (AdapterView, AbsListView, GridView, ScrollBarDrawable) and adding in code to handle the horizontal code. This is mainly copying some of the code and changing top to left, bottom to right, etc. The main reason for having to copy instead of extending is the final nature of those classes.

I implemented a horizontally scrolling GridView a while ago and finally got around to pushing to github: https://github.com/jess-anders/two-way-gridview

Answer 2

You can

• use a TableLayout inside a HorizontalScrollView, or
• stay with your approach with an horizontal LinearLayout but adding vertical LinearLayouts instead of directly the images. E.g., adding three to four images per vertical LinearLayout in portrait, and redrawing to add only two in landscape.

I would try the TableLayout approach first.

PS1: for next time, try to remove all the non-relevant code (the less code is there, the easier is to understand what you did).

PS2: Remember that System.out is usually redirected to /dev/null and thus lost, so I strongly suggest you to use Log.d instead.

Complete example

Adapt this to the onCreate() method or wherever you need it:

public void horizontalScrollGalleryLayout () {
    HorizontalScrollView sv = new HorizontalScrollView(this);
    LinearLayout llh = new LinearLayout(this);
    llh.setOrientation(LinearLayout.HORIZONTAL);
    LinearLayout.LayoutParams layoutParamsTV = new LinearLayout.LayoutParams(40, 40);
    LinearLayout.LayoutParams layoutParamsLL = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    for (int i=0; i<20; i++) {
        LinearLayout llv = new LinearLayout(this);
        llv.setOrientation(LinearLayout.VERTICAL);
        TestView testView1 = new TestView(this, Color.rgb(i*12, 0, 0));
        TestView testView2 = new TestView(this, true, Color.rgb(i*12, i*12, 0));
        TestView testView3 = new TestView(this, true, Color.rgb(0, i*12, 0));
        llv.addView(testView1, layoutParamsTV);
        llv.addView(testView2, layoutParamsTV);
        llv.addView(testView3, layoutParamsTV);
        llh.addView(llv, layoutParamsLL);
    }
    sv.addView(llh, layoutParamsLL);
    setContentView(sv);
}

I'm using a very simple View as an example:

public class TestView extends View {
Context context;
int color;

public TestView(Context context, int color) {
    super(context);
    this.context = context;
    this.color = color;
}

@Override
public void onDraw (Canvas canvas) {
    super.onDraw(canvas);
    this.setBackgroundColor(Color.LTGRAY);
    Paint paint = new Paint (Paint.ANTI_ALIAS_FLAG);
    paint.setColor(color);
    canvas.drawCircle(20, 20, 20, paint);
}
}

Answer 3

There is a very easy trick.

1. Rotate the grid view by 270 degree and set number of columns as 2.
2. Rotate each item to 90 degree (so that the items are displayed as original orientation).

This might be useful for some!!

Answer 4

I have done this way:

activity_main.xml:

<HorizontalScrollView
   android:layout_width="match_parent"
   android:layout_height="wrap_content">

      <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="horizontal">

          <GridView
             android:id="@+id/gridView"
             android:layout_width="match_parent"
             android:layout_height="wrap_content">
          </GridView>

      </LinearLayout>

</HorizontalScrollView>

MainActivity.java:

GridView gridView = (GridView) findViewById(R.id.gridView);

gridView.setNumColumns(arrayList.size());

GridViewAdapter gridViewAdapter = new GridViewAdapter(mContext, arrayList);
gridView.setAdapter(gridViewAdapter); 

// Set dynamic width of Gridview
setDynamicWidth(gridView);

Add below method:

private void setDynamicWidth(GridView gridView) {
        ListAdapter gridViewAdapter = gridView.getAdapter();
        if (gridViewAdapter == null) {
            return;
        }
        int totalWidth;
        int items = gridViewAdapter.getCount();
        View listItem = gridViewAdapter.getView(0, null, gridView);
        listItem.measure(0, 0);
        totalWidth = listItem.getMeasuredWidth();
        totalWidth = totalWidth*items;
        ViewGroup.LayoutParams params = gridView.getLayoutParams();
        params.width = totalWidth;
        gridView.setLayoutParams(params);
 }

Hope this will help you.

Answer 5

I have already posted this answer here, but both questions are identical...

---

There is a nice solution in Android from now on : HorizontalGridView.

1. Gradle dependency

dependencies {
    compile 'com.android.support:leanback-v17:23.1.0'
}

---

2. Add it in your layout

your_activity.xml

<!-- your stuff before... -->
        <android.support.v17.leanback.widget.HorizontalGridView
            android:layout_width="wrap_content"
            android:layout_height="80dp"
            android:id="@+id/gridView"
            />
<!-- your stuff after... -->

---

3. Layout grid element

Create a layout for your grid element ( grid_element.xml ). I have created a simple one with only one button in it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button" />
</LinearLayout>

---

4. Create an adapter

Highly inspired by this link : https://gist.github.com/gabrielemariotti/4c189fb1124df4556058

public class GridElementAdapter extends RecyclerView.Adapter<GridElementAdapter.SimpleViewHolder>{

    private Context context;
    private List<String> elements;

    public GridElementAdapter(Context context){
        this.context = context;
        this.elements = new ArrayList<String>();
        // Fill dummy list
        for(int i = 0; i < 40 ; i++){
            this.elements.add(i, "Position : " + i);
        }
    }

    public static class SimpleViewHolder extends RecyclerView.ViewHolder {
        public final Button button;

        public SimpleViewHolder(View view) {
            super(view);
            button = (Button) view.findViewById(R.id.button);
        }
    }

    @Override
    public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View view = LayoutInflater.from(this.context).inflate(R.layout.grid_element, parent, false);
        return new SimpleViewHolder(view);
    }

    @Override
    public void onBindViewHolder(SimpleViewHolder holder, final int position) {
        holder.button.setText(elements.get(position));
        holder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, "Position =" + position, Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemCount() {
        return this.elements.size();
    }
}

---

5. Initialize it in your activity :

private HorizontalGridView horizontalGridView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_activity);
    horizontalGridView = (HorizontalGridView) findViewById(R.id.gridView);
    GridElementAdapter adapter = new GridElementAdapter(this);

    horizontalGridView.setAdapter(adapter);
}

Answer 6

Use recyclerview with setting its gridlayout as layout manager and set it to horizontal scroll

your recycle view.setLayoutManager(new GridLayoutManager(getActivity(),2, LinearLayoutManager.HORIZONTAL, false))

here 2 is the column span for grid