notifyDataSetChanged()不调用getView的问题

3DXcat 2017-11-09 09:35:52

想写一个可以在发送消息后更新List的功能，但是发送后没有反应

界面

输入 “send”并点击send按钮两次后的TAG

MainActivity中代码

public class MainActivity extends Activity {

	

	private ListView msgListView;

	private EditText inputText;

	private Button send;

	private MsgAdapter adapter;

	private List<Msg> msgList = new ArrayList<Msg>();

	

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.activity_main);

        

        initMsgs();

        adapter = new MsgAdapter(MainActivity.this,R.layout.msg_item,msgList);

        inputText = (EditText) findViewById(R.id.input_text);

        send = (Button) findViewById(R.id.send);

        msgListView = (ListView) findViewById(R.id.msg_list_view);

        

        send.setOnClickListener(new OnClickListener() {

			

			@Override

			public void onClick(View v) {

				String content = inputText.getText().toString();

				if(!"".equals(content)){

					Msg msg = new Msg(content, Msg.TYPE_SENT);

					Log.d("TAG",msgList.toString());

					msgList.add(msg);

					adapter.notifyDataSetChanged();

					msgListView.setSelection(msgList.size());

					inputText.setText("");

				}

				

			}

		});

    }

    private void initMsgs(){

    	

    	Msg msg1 = new Msg("Hello!",Msg.TYPE_RECEIVED);

    	msgList.add(msg1);

    	Msg msg2 = new Msg("good.",Msg.TYPE_RECEIVED);

    	msgList.add(msg2);

    	Msg msg3 = new Msg("what?",Msg.TYPE_RECEIVED);

    	msgList.add(msg3);

    	Msg msg4 = new Msg("You are right.",Msg.TYPE_RECEIVED);

    	msgList.add(msg4);

    	

    }



}

自定义的适配器如下，重写了getCount与getView，其中的Log没有执行

public class MsgAdapter extends ArrayAdapter<Msg> {

	

	private int resourceId;

	public MsgAdapter(Context context, int textViewResourceId, List<Msg> objects) {

		super(context, textViewResourceId, objects);

		resourceId = textViewResourceId;

		Log.d("TAG","GET RESOURCEID");

	}

	

	@Override

	public int getCount(){

		

		int text = super.getCount();

		Log.d("TAG", "COUNT RUNNING"+text);

		return text;

		

	}

	

	@Override

	public View getView(int position, View convertView, ViewGroup parent){

		Msg msg = getItem(position);

		View view;

		ViewHolder viewHolder;

		if(convertView == null){

			view = LayoutInflater.from(getContext()).inflate(resourceId, null);

			viewHolder = new ViewHolder();

			viewHolder.leftLayout = (LinearLayout) view.findViewById(R.id.left_layout);

			viewHolder.rightLayout = (LinearLayout) view.findViewById(R.id.right_layout);

			viewHolder.leftMsg = (TextView) view.findViewById(R.id.left_msg);

			viewHolder.rightMsg = (TextView) view.findViewById(R.id.right_msg);

			view.setTag(viewHolder);

		}

		else{

			view = convertView;

			viewHolder = (ViewHolder)view.getTag();

		}

		Log.d("TAG","GETVIEW RUNNING");

		if(msg.getType() == Msg.TYPE_RECEIVED){

			viewHolder.leftLayout.setVisibility(View.VISIBLE);

			viewHolder.rightLayout.setVisibility(View.GONE);

			Log.d("TAG","1122");

			viewHolder.leftMsg.setText(msg.getContent());

		}

		else if(msg.getType() == Msg.TYPE_SENT){

			viewHolder.rightLayout.setVisibility(View.VISIBLE);

			viewHolder.leftLayout.setVisibility(View.GONE);

			Log.d("TAG","2211");

			viewHolder.rightMsg.setText(msg.getContent());

		}

		return view;

	}

	

	class ViewHolder{

		

		LinearLayout leftLayout;

		

		LinearLayout rightLayout;

		

		TextView leftMsg;

		

		TextView rightMsg;

		

	}



}