While changing my Relative layout to Linearlayout its throwing Null point exception on textview for TTS

Question

I am using in TTS in my listview,while using TTS in Relative layout it works fine.Now i changed my layout to LinearLayout.Its throwing Null pointer exception for that txt,so while clicking the TTS button its showing My activity has stopped.

Here my Applicationadapter.java

@Override
    public View getView(int position, View convertView, ViewGroup parent){
        ViewHolder holder = null;

        tts = new TextToSpeech(activity, ApplicationAdapter.this);


        //View v = convertView;
        if ( convertView == null ){ 
            convertView = inflator.inflate(R.layout.activity_row, null);
            holder = new ViewHolder();
            holder.text2 = (TextView) convertView.findViewById(R.id.text2);
            holder.text1 = (TextView) convertView.findViewById(R.id.text1);
            holder.count = (TextView) convertView.findViewById(R.id.count); 
            holder.pray  = (Button) convertView.findViewById(R.id.pray);
            holder.chk = (CheckBox) convertView.findViewById(R.id.checkbox);
            holder.btnaudioprayer = (ImageButton) convertView.findViewById(R.id.btnaudioprayer);

            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.chk.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton view,
                    boolean isChecked) {
                int getPosition = (Integer) view.getTag();
                items.get(getPosition).setSelected(view.isChecked());

            }
        });

        holder.pray.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                int getPosition= (Integer)v.getTag();
                StringBuffer sb1 = new StringBuffer();
                sb1.append("ID :");
                sb1.append(Html.fromHtml(""+items.get(getPosition).getId()));
                sb1.append("\n");
                activity.praydata(items.get(getPosition).getId());
                //activity.showAlertView(sb1.toString().trim());
                //activity.praydata(Integer.parseInt(sb1.toString().trim()));
            }


        });


         holder.btnaudioprayer.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View V) {
                    View parent = (View)V.getParent();
                    ViewHolder vh = (ViewHolder)parent.getTag();
                    TextView tv = vh.text1;
                    speakOut(tv.getText().toString());
                }

            }); 




        Application app = items.get(position);
        holder.chk.setTag(position);
        holder.pray.setTag(position);
        holder.text2.setText(Html.fromHtml(app.getTitle()));
        holder.text1.setText(Html.fromHtml(app.getContent()));
        holder.count.setText(app.getCount()+"");
        holder.chk.setChecked(app.isSelected());



        return convertView;
    }

its throwing Null pointer exception for the textview conversion part,but that textview is visible ,while clicking the button alone my application has stopped.

Error line is TextView tv = vh.text1;

Answer 1

Try the below

 holder.btnaudioprayer.setTag(holder.text1.getText()); //set the tag to teh button
 holder.btnaudioprayer.setOnClickListener(mClickListener);

Then

OnClickListener mClickListener=  new OnClickListener()
{

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Log.i(".........","hello"+v.getTag());
        String s =  v.getTag().toString(); // get the tag on button clikc
        speakOut(s); // then call speakOut with the string
    }

};

From the comment

Your changing layout has nothing to do with TextView tv = vh.text1; being null

 TextView tv = vh.text1; // this is null. assigning textview text1 to tv.

Your vh.text1 is not initialized. You will get NPE.

So just set the button tag with the value and get the tag in button click and cal speakout.