java将数据从另一个类传递给处理程序

Question

我的Handler中有一个MainActivity。这个Handler必须更新MainActivity布局中我的一个Fragment的UI

然后我有一个单独的类，它有一个循环；当我创建这个类时，我们称它为myLooper它进行某种计算，然后将循环中的信息发送到我的MainActivity中的Handler。然后将数据更新到我在MainActivity的片段中实现的GraphView

流量： 第一步：计算MyLooper上的数据。 第2步：通过myHandler向MainActivity发送数据。 步骤3：让我的Handler用发送的数据更新MainActivityFragmentGraphView

相关代码：

public class MainActivity extends ActionBarActivity implements
        ActionBar.TabListener {


    public MyLooper myDataLooper;
    Fragment graphFrag = fragment_graphpage.newInstance(1);
    public final Handler myHandler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub

                ((fragment_graphpage) graphFrag).updateGraphUI(msg.getData().getFloat("myvoltage"));
            }
        };
    SectionsPagerAdapter mSectionsPagerAdapter;
    globalControlInstance globalControl;
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        globalControl = globalControlInstance.getInstance();

        myDataLooper = (IOIOBoard) getApplicationContext();
        myDataLooper.create(getBaseContext(), this,_myIOIOHandler);
        myDataLooper.start();
 }

MyLooper类：

public class MyLooper extends Application implements IOIOLooperProvider {


    globalControlInstance globalData = globalControlInstance.getInstance();
    public AnalogInput AI1;
    public Handler IOIOHandler;
    private final IOIOAndroidApplicationHelper helper_ = new IOIOAndroidApplicationHelper(
            this, this);

    protected void create(Context myContext, Activity myActivity, Handler myHandler) {
        IOIOHandler = myHandler;
        helper_.create();
    }

    protected void destroy() {
        helper_.destroy();
    }

    protected void start() {
        helper_.start();
    }

    protected void stop() {
        helper_.stop();
    }

    protected void restart() {
        helper_.restart();
    }

    class Looper extends BaseIOIOLooper {

        @Override
        protected void setup() throws ConnectionLostException {

        }

        @Override
        public void loop() throws ConnectionLostException, InterruptedException {
            Message myVoltageMessage = new Message();
            Bundle myVoltageBundle = new Bundle();
            myVoltageBundle.putFloat("myvoltage", AI1.getVoltage());
            myVoltageMessage.setData(myVoltageBundle);
            IOIOHandler.sendMessage(myVoltageMessage);
        }
    }

    @Override
    public IOIOLooper createIOIOLooper(String connectionType, Object extra) {
        return new Looper();
    }


}

最后是包含我的GraphView的updateGraphUI方法的Fragment：

public void updateGraphUI(float newReading) {
    final double newReadingDouble = newReading;
        mTimer2 = new Runnable() {

            @Override
            public void run() {
                graphLoopCounter++;

                if (globalData.isLiveUpdatingEnabled()) {
                alarmCheck(newReadingDouble);
                globalData.setGraph2LastXValue(globalData
                        .getGraph2LastXValue() + 1d);
                globalData.getGraphViewSeries().appendData(
                        new GraphViewData(globalData.getGraph2LastXValue(),
                                newValue), true, 1000);
                if (globalData.getGraphPeak() < newReadingDouble) {
                    globalData.setGraphPeak(newReadingDouble);
                    graphPeak.setText("Graph Peak: "
                            + Double.toString(newReadingDouble));
                }


                    avgSum += globalData.getLatestGraphData();
                        graphAvg.setText("Graph Avg: " + Double.toString(avgSum/graphLoopCounter));


                mHandler.postDelayed(this, 100);
                }
            }
        };
        mHandler.postDelayed(mTimer2, 100);

}

其中mHandler是my Fragment实现中的处理程序。而且mTimer1和mTimer2都是Runnable

我的问题是；无论我尝试做什么，数据都不会发送到我的GraphView，而且永远不会更新

Answer 1

在MainActivity中，将处理程序实例命名为“myHandler”，然后将MyLooper类传递给“_MyIOHandler”