small useful custom view classes

attrs.xml

<resources>
    <declare-styleable name="ScrollViewWithMaxHeight">
        <attr name="maxHeight" format="dimension"/>
    </declare-styleable>
</resources>

ObservableWebView.java

// click and scrol listener supported webview

package gturedi.gist;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.webkit.WebView;

public class ObservableWebView
        extends WebView {

    public interface OnScrollChangedCallback {
        void onScroll(int l, int t);
    }

    private final float MOVE_THRESHOLD_DP = 20 * getResources().getDisplayMetrics().density;

    private boolean mMoveOccurred;
    private float mDownPosX;
    private float mDownPosY;

    private OnScrollChangedCallback mOnScrollChangedCallback;

    public ObservableWebView(final Context context) {
        super(context);
    }

    public ObservableWebView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    public ObservableWebView(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        final int action = ev.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mMoveOccurred = false;
                mDownPosX = ev.getX();
                mDownPosY = ev.getY();
                break;
            case MotionEvent.ACTION_UP:
                // click occurred
                if (!mMoveOccurred) {
                    performClick();
                }
                break;
            case MotionEvent.ACTION_MOVE:
                // scroll occurred
                if (Math.abs(ev.getX() - mDownPosX) > MOVE_THRESHOLD_DP || Math.abs(ev.getY() - mDownPosY) > MOVE_THRESHOLD_DP) {
                    mMoveOccurred = true;
                }
                break;

        }
        return super.onTouchEvent(ev);
    }

    @Override
    protected void onScrollChanged(final int l, final int t, final int oldl, final int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        if(mOnScrollChangedCallback != null) mOnScrollChangedCallback.onScroll(l, t);
    }

    public OnScrollChangedCallback getOnScrollChangedCallback() {
        return mOnScrollChangedCallback;
    }

    public void setOnScrollChangedCallback(final OnScrollChangedCallback onScrollChangedCallback) {
        mOnScrollChangedCallback = onScrollChangedCallback;
    }

}

ScrollViewWithMaxHeight.java

// custom scrollview with maxHeight field

package gturedi.dev.external;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.ScrollView;
import gturedi.dev.R;

public class ScrollViewWithMaxHeight
        extends ScrollView {

    public static int WITHOUT_MAX_HEIGHT_VALUE = -1;

    private int maxHeight = WITHOUT_MAX_HEIGHT_VALUE;

    public ScrollViewWithMaxHeight(Context context) {
        super(context);
    }

    public ScrollViewWithMaxHeight(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray typedArray = context.getTheme().obtainStyledAttributes(
                attrs, R.styleable.ScrollViewWithMaxHeight, 0, 0);
        float value = typedArray.getDimension(R.styleable.ScrollViewWithMaxHeight_maxHeight, 0);
        typedArray.recycle();
        setMaxHeight((int) value);
    }

    public ScrollViewWithMaxHeight(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        try {
            int heightSize = MeasureSpec.getSize(heightMeasureSpec);
            if (maxHeight != WITHOUT_MAX_HEIGHT_VALUE && heightSize > maxHeight) {
                heightSize = maxHeight;
            }
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.AT_MOST);
            getLayoutParams().height = heightSize;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setMaxHeight(int maxHeight) {
        this.maxHeight = maxHeight;
    }

}

TouchAwareRelativeLayout.java

// aware clicks in adapter with clickable children

package gturedi.com.gitsamples.gist.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.RelativeLayout;

public class TouchAwareRelativeLayout
        extends RelativeLayout {

    private final float MOVE_THRESHOLD_DP = 20 * getResources().getDisplayMetrics().density;

    private boolean mMoveOccured;
    private float mDownPosX;
    private float mDownPosY;

    public TouchAwareRelativeLayout(Context context) {
        super(context);
    }

    public TouchAwareRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        final int action = ev.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mMoveOccured = false;
                mDownPosX = ev.getX();
                mDownPosY = ev.getY();
                break;
            case MotionEvent.ACTION_UP:
                if (!mMoveOccured) {
                    performClick();
                }
                break;
            case MotionEvent.ACTION_MOVE:
                if (Math.abs(ev.getX() - mDownPosX) > MOVE_THRESHOLD_DP || Math.abs(ev.getY() - mDownPosY) > MOVE_THRESHOLD_DP) {
                    mMoveOccured = true;
                }
                break;

        }
        return super.onInterceptTouchEvent(ev);
    }

}