子线程修改UI异常

异常信息：

01-10 00:46:22.039: E/AndroidRuntime(1621): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

点击事件中修改一个TextView的颜色：

public void changeColor (View v){
    new Thread(new Runnable() {

        @Override
        public void run() {
             //子线程更新UI

            main_tv.setTextColor(Color.RED);
        }
    }).start();
}

子线程是无法直接修改UI的我们可以子线程里通过handler.setMessage(),来通知UI线程（主线程）　修改UI

public void changeColor (View v){
final Thread thread  =new Thread(new Runnable() {

        @Override
        public void run() {

            //子线程更新UI
//          
//          if(Looper.myLooper()==Looper.getMainLooper()){
//          main_tv.setTextColor(Color.RED);
//          }

             Message msg =Message.obtain();
             msg.what=1;
            Handler.sendMessage(msg ); //发消息
        }
    });
    thread.start();

}

接收处理消息：

public class MainActivity extends Activity {

    private String TAG ="MainActivity";

    Handler Handler = new Handler(){

        public void handleMessage(android.os.Message msg) {

            if(msg.what==1){

                main_tv.setTextColor(Color.RED);
            }

        };
    };

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