View More and View Less in Android

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                              View More and View Less in Android


Here are the code for view more and view less  in android.

import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.view.Menu;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.TextView;
import android.widget.TextView.BufferType;

public class MainActivity extends Activity {

    TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);
        viewMoreViewLess(tv, 3, "View More", true);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);

        return true;
    }

    public static void viewMoreViewLess(final TextView tv, final int maxLine, final String expandText, final boolean viewMore) {

        if (tv.getTag() == null) {
            tv.setTag(tv.getText());
        }
        ViewTreeObserver vto = tv.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

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

                ViewTreeObserver obs = tv.getViewTreeObserver();
                obs.removeGlobalOnLayoutListener(this);
                if (maxLine == 0) {
                    int lineEndIndex = tv.getLayout().getLineEnd(0);
                    String text = tv.getText().subSequence(0, lineEndIndex - expandText.length() + 1) + " " + expandText;
                    tv.setText(text);
                    tv.setMovementMethod(LinkMovementMethod.getInstance());
                    tv.setText(
                            addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, maxLine, expandText,
                                    viewMore), BufferType.SPANNABLE);
                } else if (maxLine > 0 && tv.getLineCount() >= maxLine) {
                    int lineEndIndex = tv.getLayout().getLineEnd(maxLine - 1);
                    String text = tv.getText().subSequence(0, lineEndIndex - expandText.length() + 1) + " " + expandText;
                    tv.setText(text);
                    tv.setMovementMethod(LinkMovementMethod.getInstance());
                    tv.setText(
                            addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, maxLine, expandText,
                                    viewMore), BufferType.SPANNABLE);
                } else {
                    int lineEndIndex = tv.getLayout().getLineEnd(tv.getLayout().getLineCount() - 1);
                    String text = tv.getText().subSequence(0, lineEndIndex) + " " + expandText;
                    tv.setText(text);
                    tv.setMovementMethod(LinkMovementMethod.getInstance());
                    tv.setText(
                            addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, lineEndIndex, expandText,
                                    viewMore), BufferType.SPANNABLE);
                }
            }
        });

    }

    private static SpannableStringBuilder addClickablePartTextViewResizable(final Spanned strSpanned, final TextView tv,
            final int maxLine, final String spanableText, final boolean viewMore) {
        String str = strSpanned.toString();
        SpannableStringBuilder ssb = new SpannableStringBuilder(strSpanned);

        if (str.contains(spanableText)) {
            ssb.setSpan(new ClickableSpan() {

                @Override
                public void onClick(View widget) {

                    if (viewMore) {
                        tv.setLayoutParams(tv.getLayoutParams());
                        tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
                        tv.invalidate();
                        makeTextViewResizable(tv, -1, "View Less", false);
                    } else {
                        tv.setLayoutParams(tv.getLayoutParams());
                        tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
                        tv.invalidate();
                        viewMoreViewLess(tv, 3, "View More", true);
                    }

                }
            }, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);

        }
        return ssb;

    }

}



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