A simple implementation for AutoWrapLayout for TextView

AutoWrapLayout.java

/**
 * This f**king code was created by Leo on 11/12/14.
 */
public class AutoWrapLayout extends RelativeLayout {
    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
    private static final int DEFAULT_MARGIN = 5; // dp

    private int margin;
    private LinkedList<String> dataList;

    public AutoWrapLayout(Context context) {
        this(context, null);
    }

    public AutoWrapLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AutoWrapLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        margin = (int) (getResources().getDisplayMetrics().density * DEFAULT_MARGIN);
    }

    public void setDataList(LinkedList<String> dataList) {
        this.dataList = dataList;
        for (String string : dataList) {
            Button button = (Button) inflate(getContext(), R.layout.my_button, null);
            setViewId(button);
            button.setText(string);
            addView(button);
        }

        // re-layout
        post(new Runnable() {
            @Override
            public void run() {
                reLayout();
            }
        });
    }

    /**
     * Set margin in DP
     * @param margin in DP
     */
    public void setMargin(int margin) {
        this.margin = (int) (margin * getResources().getDisplayMetrics().density);

        // re-layout
        post(new Runnable() {
            @Override
            public void run() {
                reLayout();
            }
        });
    }

    private void reLayout() {
        View topView = null;
        int totalWidth = 0;
        int maxWidth = getMeasuredWidth();
        maxWidth -= getPaddingLeft() + getPaddingRight(); // take paddings in to account

        for (int i = 0; i < getChildCount(); i++) {
            View v = getChildAt(i);
            LayoutParams layoutParams = (LayoutParams) v.getLayoutParams();

            int width = v.getMeasuredWidth();
            if (i == 0) {
                totalWidth = width;
            } else {
                if (totalWidth + width > maxWidth) {
                    topView = getChildAt(i - 1);
                    layoutParams.addRule(BELOW, topView.getId());
                    layoutParams.topMargin = margin;
                    totalWidth = width;
                } else {
                    if (topView != null) {
                        layoutParams.addRule(BELOW, topView.getId());
                        layoutParams.topMargin = margin;
                    }
                    layoutParams.addRule(RIGHT_OF, getChildAt(i - 1).getId());
                    layoutParams.leftMargin = margin;
                    totalWidth += width + margin;
                }
            }
            v.setLayoutParams(layoutParams);
        }
    }

    private void setViewId(View v) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
            v.setId(generateViewIdManually());
        } else {
            v.setId(generateViewId());
        }
    }

    /**
     * Generate a value suitable for use in {@link #setId(int)}.
     * This value will not collide with ID values generated at build time by aapt for R.id.
     *
     * @return a generated ID value
     */
    private int generateViewIdManually() {
        for (;;) {
            final int result = sNextGeneratedId.get();
            // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
            int newValue = result + 1;
            if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
            if (sNextGeneratedId.compareAndSet(result, newValue)) {
                return result;
            }
        }
    }
}

button_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners
        android:radius="5dp"/>
    <solid
        android:color="@android:color/transparent" />
    <stroke
        android:color="@android:color/holo_green_dark"
        android:width="2dp" />
    <padding
        android:bottom="10dp"
        android:top="10dp"
        android:left="10dp"
        android:right="10dp"/>
</shape>

my_button.xml

<?xml version="1.0" encoding="utf-8"?>
<Button xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/button_bg"
    android:textSize="25sp"/>