Handler更新ui的三种方式

public class MainActivity extends Activity {

private TextView text;
private Handler handler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView) findViewById(R.id.id_text);

/**
* new Thread()在该线程中实现你具体的业务逻辑，比如网络请求，耗时操作等等；
* new Thread()是一个子线程，是非UI线程，如果在该线程中需要更新界面，则需要使用Handler；
*
*/
new Thread() {
@Override
public void run() {//在run()方法实现业务逻辑；
//...

//更新UI操作；
handler.post(new Runnable() {
@Override
public void run() {
text.setText(使用Handler更新了界面);
}
});

}
}.start();
}}

public class MainActivity extends Activity {

private TextView text;
private Handler handler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView) findViewById(R.id.id_text);
final MyRunnable myRunnable = new MyRunnable();//定义MyRunnable的对象；

new Thread() {

@Override
public void run() {
handler.post(myRunnable);//调用Handler.post方法；
}
}.start();
}

class MyRunnable implements Runnable {//内部类实现Runnable接口；

@Override
public void run() {//还是在Runnable重写的run()方法中更新界面；
text.setText(使用Handler更新了界面);
}
}}

public class MainActivity extends Activity {

private TextView text;
private Handler handler = new Handler() {

@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
text.setText(使用Handler更新了界面);
break;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView) findViewById(R.id.id_text);

new Thread() {

@Override
public void run() {
//...你的业务逻辑；
Message message = new Message();//发送一个消息，该消息用于在handleMessage中区分是谁发过来的消息；
message.what = 1;
handler.sendMessage(message);
}
}.start();
}}