UI元素不应该更新

时间:2016-09-07 08:30:43

标签: android ui-thread android-runonuithread

我有一个下载服务,通过回调更新UI。例如,如果我取消下载任务,则正确项目的UI应相应更改。 UI更新方法如下所示:

activity.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            downloadSwitch.setClickable(true);
            downloadSwitch.setChecked(false);
            downloadSwitchText.setText(R.string.switch_download_available);
            downloadSwitchText.setVisibility(View.VISIBLE);
            downloadSwitch.setDownloadState(State.READY);
        }
    });

我注意到,有时在调用此方法后,只有文本更改,但交换机保持选中状态,反之亦然。有人遇到过这个问题吗?

EDIT_1:我想我应该提一下,ViewPager Activity中的项目是不同的片段,这些方法位于片段中

EDIT_2:自定义切换

public class DownloadSwitch extends Switch {
private static final String TAG = DownloadSwitch.class.getSimpleName();

private State downloadState;

public DownloadSwitch(Context context) {
    super(context);
}

public DownloadSwitch(Context context, AttributeSet attrs) {
    super(context, attrs);
    initCostumeAttrs(attrs);
}

public DownloadSwitch(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initCostumeAttrs(attrs);
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public DownloadSwitch(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    initCostumeAttrs(attrs);
}

private void initCostumeAttrs(AttributeSet attributeSet){
    TypedArray attributes = getContext().getTheme().obtainStyledAttributes(attributeSet, R.styleable.DownloadSwitch, 0, 0);
    int intState = attributes.getInt(R.styleable.DownloadSwitch_state, 0);

    switch (intState){
        case 0:
            downloadState = State.READY;
            setChecked(false);
            break;
        case 1:
            downloadState = State.DOWNLOADING;
            setChecked(true);
            break;
        case 2:
            downloadState = State.DONE;
            setChecked(true);
            break;
    }
    attributes.recycle();
}

@Override
public void setClickable(boolean clickable) {
    super.setClickable(clickable);
    if(clickable){
        setVisibility(VISIBLE);
    } else {
        setVisibility(GONE);
    }
}

@Override
public void setChecked(boolean checked) {
    super.setChecked(checked);
    changeColor(checked);
}

private void changeColor(boolean checked) {
    int thumbColor;
    int trackColor;
    if(checked){
        thumbColor = Color.argb(225, 226, 6, 19);
        trackColor = Color.argb(225, 0, 244, 217);
    } else {
        thumbColor = Color.argb(225, 255, 255, 255);
        trackColor = Color.argb(225, 221, 221, 221);
    }

    try {
        getThumbDrawable().setColorFilter(thumbColor, PorterDuff.Mode.MULTIPLY);
        getTrackDrawable().setColorFilter(trackColor, PorterDuff.Mode.MULTIPLY);
    }
    catch (NullPointerException e) {
        e.printStackTrace();
    }
}

我注意到NullPointerException有时会changeColor()。也许它与此有关?加载活动时,所有UI元素都已正确设置。只有在我进行实时更改时才会发生这种情况。

感谢。

0 个答案:

没有答案