Handler机制更新UI线程控件

来源：互联网发布：淘宝商品已过期编辑：程序博客网时间：2024/05/16 11:47
public class HandlerTestActivity extends Activity {    private TextView tv;    private static final int UPDATE = 0;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            // TODO 接收消息并且去更新UI线程上的控件内容            if (msg.what == UPDATE) {                // Bundle b = msg.getData();                // tv.setText(b.getString("num"));                tv.setText(String.valueOf(msg.obj));            }            super.handleMessage(msg);        }    };    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        tv = (TextView) findViewById(R.id.tv);        new Thread() {            @Override            public void run() {                // TODO 子线程中通过handler发送消息给handler接收，            //由handler去更新TextView的值                try {                    for (int i = 0; i < 100; i++) {                        Thread.sleep(500);                        Message msg = new Message();                        msg.what = UPDATE;                        // Bundle b = new Bundle();                        // b.putString("num", "更新后的值：" + i);                        // msg.setData(b);                        msg.obj = "更新后的值：" + i;                        handler.sendMessage(msg);                    }                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }.start();    }}
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