关于Only the original thread that created a view hierarchy can touch its views.

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今晚写进度条的时候用到了线程，想在子线程里面更新UI组件，给我报了一个

Only the original thread that created a view hierarchy can touch its views.

百度后已解决，记录下来作为备忘

在Android中ui组件不是线程安全的，因此只能在主线程里更新，得使用到Handler机制

代码如下

public class MainActivity extends AppCompatActivity {private Button tiao = null;
    private Button yuan = null;
    private ProgressDialog p = null;
    int iCon = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tiao = (Button)super.findViewById(R.id.tiao);
        yuan = (Button)super.findViewById(R.id.yuan);

        tiao.setOnClickListener(new View.OnClickListener() {@Override
            public void onClick(View v) {p = new ProgressDialog(MainActivity.this);
                p.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                p.setTitle("正在下载");
                p.setIcon(R.drawable.b);
                p.setProgress(10);
                p.setIndeterminate(false);
                p.setCancelable(true);

                //让进度条显示
                p.show();
                Thread t1 = new Thread(){@Override
                    public void run() {try {while (iCon <= 100) {// 由线程来控制进度。
                                p.setProgress(iCon++);
                                Log.d("fwk----",Integer.toString(iCon));
                                Thread.sleep(500);
                                Message msg = new Message();
                                msg.what = iCon;
                                handler.sendMessage(msg);
                            }p.cancel();
                        }catch(InterruptedException e){e.printStackTrace();
                        }}};
       }});

}
    private Handler handler = new Handler(){    @Override
        public void handleMessage(Message msg) {    p.setMessage(iCon+"%");
     }
};

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