Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;

import android.annotation.SuppressLint;

import android.graphics.drawable.Drawable;

import android.os.Build;

import android.text.Editable;

import android.text.TextUtils.TruncateAt;
import android.text.TextWatcher;

import android.view.View;

import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;

import android.widget.TextView;

public class Main {
    /**
     * Make a textview to a collapsible textview with the indicator on the right of the textview
     * 
     * @param tv , {@link TextView} to be converted
     * @param upDrawableResId , drawable resource id to be used as up indicator
     * @param downDrawableResId , drawable resource id to be used as down indicator
     * @param lineTreshold , no of line to be displayed for the collapsed state
     */
    public static void makeCollapsible(final TextView tv, int upDrawableResId, int downDrawableResId,
            final int lineTreshold) {

        final Drawable[] drawables = tv.getCompoundDrawables();
        final Drawable up = tv.getContext().getResources().getDrawable(upDrawableResId);
        final Drawable down = tv.getContext().getResources().getDrawable(downDrawableResId);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            tv.setCompoundDrawablesWithIntrinsicBounds(drawables[0], drawables[1], down, drawables[3]);
            tv.setEllipsize(TruncateAt.END);
            tv.setMaxLines(lineTreshold);
            tv.setTag(true);
            tv.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    if (v instanceof TextView) {
                        TextView tv = (TextView) v;
                        boolean snippet = (Boolean) tv.getTag();
                        if (snippet) {
                            // show everything
                            snippet = false;
                            tv.setMaxLines(Integer.MAX_VALUE);
                            tv.setEllipsize(null);
                            tv.setCompoundDrawablesWithIntrinsicBounds(drawables[0], drawables[1], up,
                                    drawables[3]);
                        } else {
                            // show snippet
                            snippet = true;
                            tv.setMaxLines(lineTreshold);
                            tv.setEllipsize(TruncateAt.END);
                            tv.setCompoundDrawablesWithIntrinsicBounds(drawables[0], drawables[1], down,
                                    drawables[3]);
                        }
                        tv.setTag(snippet);
                    }

                }
            });
        } else {
            tv.addTextChangedListener(new TextWatcher() {

                @Override
                public void afterTextChanged(Editable arg0) {

                    ViewTreeObserver vto = tv.getViewTreeObserver();
                    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

                        @SuppressWarnings("deprecation")
                        @SuppressLint("NewApi")
                        @Override
                        public void onGlobalLayout() {

                            tv.setEllipsize(TruncateAt.END);
                            int line = tv.getLineCount();
                            tv.setMaxLines(lineTreshold);
                            if (line <= lineTreshold) {
                                tv.setOnClickListener(new View.OnClickListener() {

                                    @Override
                                    public void onClick(View arg0) {
                                        // empty listener
                                        // Log.d("line count", "count: "+
                                        // tv.getLineCount());
                                    }
                                });
                                if (tv.getLayout() != null) {
                                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                                        tv.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                                    } else {
                                        tv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                                    }
                                }
                                return;
                            }

                            tv.setCompoundDrawablesWithIntrinsicBounds(drawables[0], drawables[1], down,
                                    drawables[3]);
                            tv.setTag(true);
                            tv.setOnClickListener(new View.OnClickListener() {

                                @Override
                                public void onClick(View v) {
                                    if (v instanceof TextView) {
                                        TextView tv = (TextView) v;
                                        boolean snippet = (Boolean) tv.getTag();
                                        if (snippet) {
                                            snippet = false;
                                            // show everything
                                            tv.setMaxLines(Integer.MAX_VALUE);
                                            tv.setEllipsize(null);
                                            tv.setCompoundDrawablesWithIntrinsicBounds(drawables[0], drawables[1],
                                                    up, drawables[3]);
                                        } else {
                                            snippet = true;
                                            // show snippet
                                            tv.setMaxLines(lineTreshold);
                                            tv.setEllipsize(TruncateAt.END);
                                            tv.setCompoundDrawablesWithIntrinsicBounds(drawables[0], drawables[1],
                                                    down, drawables[3]);
                                        }
                                        tv.setTag(snippet);
                                    }

                                }
                            });

                            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                                tv.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                            } else {
                                tv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                            }
                        }

                    });
                }

                @Override
                public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
                }

                @Override
                public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
                }

            });
        }

    }
}