相关疑难解决方法(0)

我是Android新手,我正在尝试使用UI-Thread,所以我写了一个简单的测试活动.但我认为我误解了一些东西,因为点击按钮 - 应用程序不再响应

public class TestActivity extends Activity {

    Button btn;
    int i = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn = (Button)findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                runThread();
            }
        });
    }

    private void runThread(){
        runOnUiThread (new Thread(new Runnable() {  
            public void run() {
                while(i++ < 1000){
                    btn.setText("#"+i);
                    try {
                        Thread.sleep(300);
                    } 
                    catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
             }
        }));
    }
}

当我尝试使用Android 4.4(Kit kat)在我的nexus 4上打开webview时,我会收到以下错误消息:

Calling View methods on another thread than the UI thread.; 
java.lang.IllegalStateException: Calling View methods on another thread than the UI thread.
com.android.webview.chromium.WebViewChromium.createThreadException(WebViewChromium.java:268)

自从我更新到Android 4.4我的Nexus 4.