How to save the content of custom array class and adapter in list view save into text in android - android-studio

Question

I need your help I am new in android programming. How can I save all the content in the list view save into text file this is my code of try to save the file but the problem is how can i put the listview array list to get the data i don't know how to put it where to put it please help how to do it to save the content of my listview
Button code:
save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
try {
File myFile = new File("/sdcard/mysdfile.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter =
new OutputStreamWriter(fOut);
for (int i = 0; i < ChatBubbles.length; i++) {
myOutWriter.append(ChatBubbles[i] +"\n");
}
myOutWriter.close();
fOut.close();
Toast.makeText(getBaseContext(),
"Done writing SD 'mysdfile.txt'",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
});
Chatbubble class:
package com.example.ezminute;
public class ChatBubble {
private String content;
private boolean myMessage;
public ChatBubble(String content, boolean myMessage) {
this.content = content;
this.myMessage = myMessage;
}
public String getContent() {
return content;
}
public boolean myMessage() {
return myMessage;
}
}
MessageAdapter:
package com.example.ezminute;
public class MessageAdapter extends ArrayAdapter<ChatBubble> {
private Activity activity;
private List<ChatBubble> messages;
public MessageAdapter(Activity context, int resource, List<ChatBubble> objects) {
super(context, resource, objects);
this.activity = context;
this.messages = objects;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
int layoutResource = 0; // determined by view type
ChatBubble ChatBubble = getItem(position);
int viewType = getItemViewType(position);
if (ChatBubble.myMessage()) {
layoutResource = R.layout.left_chat_bubble;
} else {
layoutResource = R.layout.right_chat_bubble;
}
if (convertView != null) {
holder = (ViewHolder) convertView.getTag();
} else {
convertView = inflater.inflate(layoutResource, parent, false);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
//set message content
holder.msg.setText(ChatBubble.getContent());
return convertView;
}
#Override
public int getViewTypeCount() {
// return the total number of view types. this value should never change
// at runtime. Value 2 is returned because of left and right views.
return 2;
}
#Override
public int getItemViewType(int position) {
// return a value between 0 and (getViewTypeCount - 1)
return position % 2;
}
private class ViewHolder {
private TextView msg;
public ViewHolder(View v) {
msg = (TextView) v.findViewById(R.id.txt_msg);
}
}
}