Handler的介绍

// 创建一个handler消息处理器
Handler handler = new Handler() {
// looper轮询器调用的handleMessage方法，来处理到来的消息
public void handleMessage(android.os.Message msg) {
// 处理消息
int progress = (Integer) msg.obj;
tv.setText("当前进度为：" + progress);


};

};

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
// 子线程
new Thread() {
public void run() {


for (int i = 0; i < 100; i++) {
Message msg = new Message();
msg.obj = i;
handler.sendMessage(msg);


try {
sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}


};
}.start();


}