package com.example.androidthreadtest;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener {    public static final int UPDATE_TEXT = 1;    private TextView text;    private Button changeText;    private Handler handler = new Handler() {        public void handleMessage(Message msg) {            switch (msg.what) {            case UPDATE_TEXT:                text.setText("Nice to meet you");                break;            default:                break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        text = (TextView) findViewById(R.id.text);        changeText = (Button) findViewById(R.id.change_text);        changeText.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.change_text:            new Thread(new Runnable() {                @Override                public void run() {                    Message message = new Message();                    message.what = UPDATE_TEXT;                    handler.sendMessage(message);                }            }).start();            break;        default:            break;        }    }}