我在我的列表视图中使用 TTS,而在相对布局中使用 TTS 时效果很好。现在我将布局更改为 LinearLayout。它为该 txt 抛出 Null 指针异常,因此在单击 TTS 按钮时,它显示我的活动已停止。
这是我的 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;
}
它为 textview 转换部分抛出 Null 指针异常,但该 textview 是可见的,而单独单击按钮时,我的应用程序已停止。
错误线是 TextView tv = vh.text1;