2016-7-26 TextView自动下滚,以及TCP Client

TextView的设置

weight保证这个view不出显示问题

onCreate中

 

tcp client:

public void click_start(View view) {
        flag = true;
        new Thread() {
            @Override
            public void run() {
                try {
                    if (socket == null || socket.isClosed())
                        socket = new Socket(ip, port);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                while (flag) {

                    try {
                        // 发送
                        writer = socket.getOutputStream();
                        writer.write("Hello server".getBytes("utf-8"));
                        // 接收
                        reader = socket.getInputStream();
                        int len = -1;
                        byte[] buffer = new byte[1024];
                        while ((len = reader.read(buffer)) != -1) {
                            str = new String(buffer, 0, len);
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    _tv.append("\n" + str + " | " + new Date(System.currentTimeMillis()));

                                    int offset = _tv.getLineCount() * _tv.getLineHeight();
                                    if (offset > _tv.getHeight()) {
                                        // 更新文字时，使用View的scrollTo(int x,int y)方法
                                        // 使其自动滚动到最后一行。
                                        _tv.scrollTo(0, offset - _tv.getHeight());
                                    }
                                }
                            });
                            writer.write("Hello server".getBytes("utf-8"));
                            try {
                                Thread.sleep(1000);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }

    public void click_stop(View view) {
        flag = false;
        _tv.setText("");
        if (socket != null) {
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            socket = null;
        }
    }

效果: