如何在静态方法中使用"runOnUiThread(runnable)"？

Question

我正在两个不同的类中编写代码.第一个运行IOIO线程,读取IOIO板的引脚状态; 当这个线程运行时,它将更新另一个类(Tab3Activity.java)上的几个TextView.

我调用了方法来更新UI,就像下面的代码一样.

Tab3Activity.setText(index,"string here");

在setText()上述需求是静态的,否则它提供了一个犯错

无法从Tab3Activity类型对非静态方法setText(int,String)进行静态引用

问题出在Tab3Activity.java上.

public static void setText(final int idx,final String str) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            _textview[idx].setText(str);
        }
    });
}

在runOnUiThread上面给出了一个ERR.

无法从类型Activity对静态方法runOnUiThread(Runnable)进行静态引用

这是用Globalioio.java编写的IOIO线程代码,我正在尝试更新Tab3Activity.java上的UI.看看这个Loop()方法.

class Looper extends BaseIOIOLooper {

    @Override
    public void setup() throws ConnectionLostException {
        //setup DigitalOutputs, AnalogInputs etc here.
        if(Tab2Activity.isOpened==true){
            led_ = ioio_.openDigitalOutput(0, true);

            pwm1S = ioio_.openPwmOutput(10, 100);
            pwm1S.setDutyCycle((float)Tab2Activity.pwm1Speed.getProgress()/100);
            pwm1Move = ioio_.openDigitalOutput(11, false);

            pwm2S = ioio_.openPwmOutput(12, 100);
            pwm2S.setDutyCycle((float)Tab2Activity.pwm2Speed.getProgress()/100);
            pwm2Move = ioio_.openDigitalOutput(13, false);

            pwmSrvo1 = ioio_.openPwmOutput(26, 100);
            pwmSrvo1.setDutyCycle((float)Tab2Activity.servo1.getProgress()/100);
            pwmSrvo2 = ioio_.openPwmOutput(27, 100);
            pwmSrvo2.setDutyCycle((float)Tab2Activity.servo2.getProgress()/100);
        }
        if(Tab3Activity.isOpened==true){
            sensor1 = ioio_.openAnalogInput(41);
            sensor2 = ioio_.openAnalogInput(42);
            for(int i = 0;i<30;i++){
                    dInput[i] = ioio_.openDigitalInput(DIGITAL_SENSOR_PIN[i]);
            }
            for(int i = 0; i<10;i++){
                aInput[i] = ioio_.openAnalogInput(ANALOG_SENSOR_PIN[i]);
            }
        }

        connStatus=true;
    }

    @Override
    public void loop() throws ConnectionLostException {
        try {
            if(Tab3Activity.slideDrawer2.isOpened()==true){
                final float range1 = (float)(2914/(sensor1.read() * 675.18+5))-1;
                Tab3Activity.setSeekBarSensor(0,(int) (range1));
                Tab3Activity.setTextSensor(0,Float.toString((range1)));
                final float range2 = (float)(2914/(sensor2.read() * 675.18+5))-1;
                Tab3Activity.setSeekBarSensor(1,(int) (range2));
                Tab3Activity.setTextSensor(1,Float.toString(range2));

            }
            if(Tab3Activity.slideDrawer1.isOpened()==true){
                if(Tab3Activity.pinsGroup==0){
                    int idx =0;
                    for(int i = 0;i<10;i++){
                       final boolean readingD = dInput[i].read();
                       if(readingD==true){
                           Tab3Activity.setSeekBar(idx,(int) (100));
                       }else{
                           Tab3Activity.setSeekBar(idx,(int) (0));
                       }
                       Tab3Activity.setText(idx,Boolean.toString(readingD));
                       idx++;
                    }
                }else if(Tab3Activity.pinsGroup==1){
                    int idx =0;
                    for(int i = 10;i<20;i++){
                          final boolean readingD = dInput[i].read();
                            if(readingD==true){
                                Tab3Activity.setSeekBar(idx,(int) (100));
                            }else{
                                Tab3Activity.setSeekBar(idx,(int) (0));
                           }
                            Tab3Activity.setText(idx,Boolean.toString(readingD));
                            idx++;
                        }
                }else if(Tab3Activity.pinsGroup==2){
                    int idx=0;
                    for(int i = 20;i<30;i++){
                          final boolean readingD = dInput[i].read();
                            if(readingD==true){
                                Tab3Activity.setSeekBar(idx,(int) (100));
                            }else{
                                Tab3Activity.setSeekBar(idx,(int) (0));
                           }
                            Tab3Activity.setText(idx,Boolean.toString(readingD));
                            idx++;
                    }
                }else if(Tab3Activity.pinsGroup==3){
                    int idx=0;
                    for(int i = 0;i<10;i++){
                        final float readingA = aInput[i].read();
                        Tab3Activity.setSeekBar(idx,(int) (readingA * 100));
                        Tab3Activity.setText(idx,Float.toString((readingA * 100)));
                        idx++;
                    }
                }
            }
            Thread.sleep(10);
        } catch (InterruptedException e) {
            ioio_.disconnect();
        } catch (ConnectionLostException e) {
            throw e;
        }
    }
}




@Override
public IOIOLooper createIOIOLooper(String arg0, Object arg1) {
    // TODO Auto-generated method stub
    return new Looper();
}

有没有替代方法呢？请给出简单的一个,我对android很新.提前致谢

Answer 1

如果此线程是从同一个活动启动的

然后你可以将活动的引用传递给线程,并从该方法中删除静态.

YourThread thread = new YourThread(yourActivity);
thread.start();

//YourThread
public class YourThread extends Thread
{
    Tab3Activity activity;
    public YourThread(Tab3Activity activity)
    {
       Tab3Activity.activity = activity;
    }

...
    activity.setText(index,"string here");
...
}

注意:确保您的活动有android:configChanges ="orientation | keyboardHidden | screenSize".否则,当您旋转设备时,将启动一个新的活动实例.

如果您的活动没有启动该线程

那么你不应该尝试直接通过静态方法访问活动.

如果您确定您的实现,如果它不会导致内存泄漏或崩溃,那么试试这个

在您的活动或任何地方创建静态MainLooper处理程序.

public static Handler UIHandler = new Handler(Looper.getMainLooper());

现在你可以使用这个处理程序在ui线程上运行.

public static void setText(final int idx,final String str) {
    UIHandler.post(new Runnable() {
        @Override
        public void run() {
            _textview[idx].setText(str);
        }
    });
}