Tag Archives: android

Expandable Listview inside scrollview

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Expandable listview inside scrollview

When we have a ListView expandable inside ScrollView, we must make this in our layout, always expandable listview must be the last view in our layout:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_expandable_scroll_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <LinearLayout
        android:id="@+id/LinearLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin">

<!-- your code --->

 <ExpandableListView
            android:id="@+id/activity_expandable_list_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"/>

    </LinearLayout>
</ScrollView>

In your onCreate

mListView = (ExpandableListView) findViewById(R.id.activity_expandable_list_view);
        MyExpandableListAdapter adapter = new MyExpandableListAdapter(this,
                mGroups);
        mListView.setAdapter(adapter);
        mListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                                        int groupPosition, long id) {
                setListViewHeight(parent, groupPosition);
                return false;
            }
        });

You need this function:

    private void setListViewHeight(ExpandableListView listView,
                                   int group) {
        ExpandableListAdapter listAdapter = (ExpandableListAdapter) listView.getExpandableListAdapter();
        int totalHeight = 0;
        int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(),
                View.MeasureSpec.EXACTLY);
        for (int i = 0; i < listAdapter.getGroupCount(); i++) {
            View groupItem = listAdapter.getGroupView(i, false, null, listView);
            groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);

            totalHeight += groupItem.getMeasuredHeight();

            if (((listView.isGroupExpanded(i)) && (i != group))
                    || ((!listView.isGroupExpanded(i)) && (i == group))) {
                for (int j = 0; j < listAdapter.getChildrenCount(i); j++) {
                    View listItem = listAdapter.getChildView(i, j, false, null,
                            listView);
                    listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);

                    totalHeight += listItem.getMeasuredHeight();

                }
            }
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        int height = totalHeight
                + (listView.getDividerHeight() * (listAdapter.getGroupCount() - 1));
        if (height < 10)
            height = 200;
        params.height = height;
        listView.setLayoutParams(params);
        listView.requestLayout();

    }

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ListView inside ScrollView II

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See only one item

You do not have to do anything special in layout.xml file nor handle anything on the parent ScrollView. You only have to handle the child ListView. You can also use this code to use any type of child view inside a ScrollView & perform Touch operations.

ScrollView inside ListView

Just add these lines of code in your java class :

listView.setOnTouchListener(new ListView.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // Disallow the touch request for parent scroll on touch of child view
                v.getParent().requestDisallowInterceptTouchEvent(true);
                return false;
            }
        });

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How to Create a ListView inside ScrollView

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Today we’ll show you how to create a list view inside a scrollview in android. It’s very easy as you will see in the example below.

With the source code provided you can create a custom ListView, which is non Scrollable as you can see:

http://thedeveloperworldisyours.com/

You can directly download the code of follow the steps of our tutorial.

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public class NonScrollListView extends ListView {

    public NonScrollListView(Context context) {
        super(context);
    }
    public NonScrollListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public NonScrollListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int heightMeasureSpec_custom = View.MeasureSpec.makeMeasureSpec(
                Integer.MAX_VALUE &gt;&gt; 2, View.MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec_custom);
        ViewGroup.LayoutParams params = getLayoutParams();
        params.height = getMeasuredHeight();
    }
}

In Your Layout File

&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fadingEdgeLength="0dp"
    android:fillViewport="true"
    android:overScrollMode="never"
    android:scrollbars="none" &gt;

    &lt;RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;!-- com.Example Changed with your Package name --&gt;

        &lt;com.thedeveloperworldisyours.view.NonScrollListView
            android:id="@+id/lv_nonscroll_list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" &gt;
        &lt;/com.thedeveloperworldisyours.view.NonScrollListView&gt;

        &lt;RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/lv_nonscroll_list" &gt;

            &lt;!-- Your another layout in scroll view --&gt;

        &lt;/RelativeLayout&gt;
    &lt;/RelativeLayout&gt;

&lt;/ScrollView&gt;

In Java File

Create a object of your customListview instead of ListView like :

NonScrollListView non_scroll_list = (NonScrollListView) findViewById(R.id.lv_nonscroll_list);

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Infinitely Scrolling List

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When you use a List or Grid, sometimes common requirement is to dynamically load more data as the user keeps scrolling down making it a potentially infinite scrolling list. This blog will guide you on how to implement this feature in your app.

Infinitely Scrolling List

We will need is our InfiniteScrollListener class that will implement OnScrollListener. Let’s jump right in and see the code for this class.

public abstract class InfiniteScrollListener implements AbsListView.OnScrollListener {
    private int mBufferItemCount = 10;
    private int mCurrentPage = 0;
    private int mItemCount = 0;
    private boolean mIsLoading = true;

    public InfiniteScrollListener(int bufferItemCount) {
        this.mBufferItemCount = bufferItemCount;
    }

    public abstract void loadMore(int page, int totalItemsCount);

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        // Do Nothing
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        if (totalItemCount < mItemCount) {
            this.mItemCount = totalItemCount;
            if (totalItemCount == 0) {
                this.mIsLoading = true;
            }
        }

        if (mIsLoading && (totalItemCount > mItemCount)) {
            mIsLoading = false;
            mItemCount = totalItemCount;
            mCurrentPage++;
        }

        if (!mIsLoading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + mBufferItemCount)) {
            loadMore(mCurrentPage + 1, totalItemCount);
            mIsLoading = true;
        }
    }

}

Then in our onCreate of Activity We must put this:

mGridView.setOnScrollListener(new InfiniteScrollListener(5) {
            @Override
            public void loadMore(int page, int totalItemsCount) {
                mProgressDialog.show();
                // your code
            }
        });

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Video MediaPlayer

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We can stream media, including video, to a MediaPlayer object using a surface view.

Video MediaPlayer

For example, you could use the following layout:

<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:background="#000000"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <SurfaceView
        android:id="@+id/activity_video_surfView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/activity_video_imageButton_play"/>

    <Button
        android:id="@+id/activity_video_imageButton_play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:background="@android:drawable/ic_media_play" />

</RelativeLayout>

We will refer to the SurfaceView in the implementation of the Activity class.

Now in our Activity class, add the following interfaces:

public class VideoActivity extends Activity implements SurfaceHolder.Callback{

Your IDE should prompt you to add these unimplemented methods:

@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
    // TODO Auto-generated method stub
}

@Override
public void surfaceCreated(SurfaceHolder arg0) {
//setup
}

@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
    // TODO Auto-generated method stub
}

@Override
public void onPrepared(MediaPlayer mp) {
//start playback
}

In surfaceCreated we must add these code line:

try {
	mMediaPlayer = new MediaPlayer();
	mMediaPlayer.setDisplay(mVidHolder);
	mMediaPlayer.setDataSource(Constants.VID_ADDRESS);
	mMediaPlayer.prepare();
	mMediaPlayer.setOnPreparedListener(this);
	mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
} catch (Exception e) {
	e.printStackTrace();
}

In surfaceDestroyed we add this:

mMediaPlayer.stop();

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