Android setVisibility&；setClickable不适用于ViewPager中的TextView（滑动），但setText是

我最近才了解JAVA和Android编程，所以请耐心听我说

上下文：我用一个XML布局制作了一个选项卡式活动（使用ViewPager和SectionsPagerAdapter）。为此，我使用了来自Android Studio的带有片段的标准活动。对于不同的页面（滑动），只有某些文本视图的值不同。我已使用onViewCreated覆盖设置了此选项。这在初始化时工作得很好，但现在我想更新和隐藏用户交互上的文本视图（onClick）。这需要跟踪占位符片段中页面的视图，我通过在本论坛上阅读的setTag和findViewWithTag方法完成了此操作，即我进行了以下覆盖：

在占位符片段中：

现在，我尝试在单击TextView textViewStart时更新三个TextView，包括单击的一个：

在主类中：

以防万一，XML中的TextView定义如下：

fragment_main.xml：

问题： 我根本无法让文本视图出现或消失，也无法让它们（取消）点击。现在的情况是，TextViewStart（tvStart）像预期的那样变为灰色，但它不会变为不可见，并且仍然可以单击（我可以启动startTimer的另一个实例）。此外，其他文本视图tvPause和tvStop也不会出现。计时器（由主类的方法startTimer（）启动）工作正常，并且使用相同的findViewWithTag方法更新同一页面上的ProgressBar

奇怪的是，TextView的ID必须是正确的，因为setText和setTextColor都在工作，但是完全相同的对象上的SetVisibility和setClickable都不工作

我第一次尝试它时没有使用runOnUiThread，其效果类似。我也试着把所有的东西都放在一个模型中，但也有类似的结果。我还尝试将startTimer放入{…}中，但这甚至没有启动计时器

我真的不明白了，我在这里忽略了什么

编辑：

以下是我的完整活动（至少是Framents设置的一部分）：

公共类SomeActivity扩展ActionBarActivity实现ActionBar.TabListener{
/**
*将提供的{@link android.support.v4.view.PagerAdapter}
*每个部分的片段。我们使用
*{@link FragmentPagerAdapter}派生，它将保留
*已在内存中加载片段。如果这变得过于内存密集，则
*最好是换成一个
*{@link android.support.v4.app.FragmentStatePagerAdapter}。
*/
分段SPAGERADAPTER mSectionsPagerAdapter；
/**
*将承载节内容的{@link ViewPager}。
*/
ViewPager mViewPager；
//彼得：需要在整个活动中访问当前选项卡吗
int currentTab；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_）；
//设置操作栏。
最终ActionBar ActionBar=getSupportActionBar（）；
actionBar.setNavigationMode（actionBar.NAVIGATION\u MODE\u选项卡）；
//创建适配器，该适配器将为这三个函数中的每一个返回一个片段
//活动的主要部分。
mSectionsPagerAdapter=newsectionspageradapter（getSupportFragmentManager（））；
//使用分区适配器设置ViewPager。
mViewPager=（ViewPager）findViewById（R.id.pager）；
mViewPager.setAdapter（mSectionsPagerAdapter）；
//在不同区段之间滑动时，选择相应的
//我们也可以使用ActionBar.tab#select（）来完成这项工作
//对选项卡的引用。
mViewPager.setOnPageChangeListener（新的ViewPager.SimpleOnPageChangeListener（）{
@凌驾
已选择页面上的公共无效（内部位置）{
actionBar.setSelectedNavigationItem（位置）；
}
});
//对于应用程序中的每个部分，在操作栏中添加一个选项卡。
对于（int i=0；i        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        //added to keep reference to View
        int position = getArguments().getInt(ARG_SECTION_NUMBER);
        rootView.setTag(position);

        return rootView;
    }

public void onClick (View clickview) {        
    Log.i("onClick called: ", Integer.toString(clickview.getId())); // this gives a valid number. probably different from TextView ID in mView defined below

    // get the current View from the ViewPager, stored using setTag
    final View mView = mViewPager.findViewWithTag(currentTab); //currentTab is a variable with the current selected Page in the ViewPager, made using an override in onTabSelected

    //Need to findIDs (for current tab page in ViewPager)
    final TextView tvStart = (TextView)mView.findViewById(R.id.textViewStart);
    final TextView tvPause = (TextView)mView.findViewById(R.id.textViewPause);
    final TextView tvStop = (TextView)mView.findViewById(R.id.textViewStop);
    //TextView tvStart = (TextView)findViewById(R.id.textViewStart); // this refers to another tab !  clickview.findViewById ONLY works for the actual object clicked

    switch (clickview.getId()) {
        case R.id.textViewStart: // START

            runOnUiThread(new Runnable() {
                  @Override
                  public void run() {
                      //update controls
                      tvStart.setClickable(false);
                      tvStart.setVisibility(View.INVISIBLE);
                      tvStart.setTextColor(Color.parseColor("#888888"));//#RRGGBB // = grey
                      tvPause.setClickable(true);
                      tvPause.setVisibility(View.VISIBLE);
                      tvStop.setClickable(true);
                      tvStop.setVisibility(View.VISIBLE);
                      //NOTE this invalidates the textViews, BUT does not redraw the View, which only happens after onClick thread is finished, so what to do??

                  }

            });

            // mViewPager.setCurrentItem(currentTab-1); //also does not update View

            //start timer
            timerStatus = 1;
            startTimer(currentTab); //this is another method, which starts a timer in the same View, this updates a ProgressBar which works.
    }
}

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="@string/Start"
    android:id="@+id/textViewStart"
    android:textSize="30dp"
    android:textColor="#fff"
    android:onClick="onClick"
    android:clickable="true"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    />

 <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="@string/Pause"
    android:id="@+id/textViewPause"
    android:textSize="30dp"
    android:textColor="#fff"
    android:onClick="onClick"
    android:clickable="false"
    android:layout_below="@+id/view"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:visibility="invisible" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="@string/Stop"
    android:id="@+id/textViewStop"
    android:textSize="30dp"
    android:textColor="#fff"
    android:onClick="onClick"
    android:clickable="false"
    android:layout_below="@+id/view"
    android:layout_alignRight="@+id/tvTimerTotal"
    android:layout_alignEnd="@+id/tvTimerTotal"
    android:visibility="invisible" />

public class SomeActivity extends ActionBarActivity implements ActionBar.TabListener {

/**
 * The {@link android.support.v4.view.PagerAdapter} that will provide
 * fragments for each of the sections. We use a
 * {@link FragmentPagerAdapter} derivative, which will keep every
 * loaded fragment in memory. If this becomes too memory intensive, it
 * may be best to switch to a
 * {@link android.support.v4.app.FragmentStatePagerAdapter}.
 */
SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
ViewPager mViewPager;

//Peter: need access to current tab throughout activity
int currentTab;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_whatever);

    // Set up the action bar.
    final ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    // When swiping between different sections, select the corresponding
    // tab. We can also use ActionBar.Tab#select() to do this if we have
    // a reference to the Tab.
    mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            actionBar.setSelectedNavigationItem(position);
        }
    });

    // For each of the sections in the app, add a tab to the action bar.
    for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
        // Create a tab with text corresponding to the page title defined by
        // the adapter. Also specify this Activity object, which implements
        // the TabListener interface, as the callback (listener) for when
        // this tab is selected.
        actionBar.addTab(
                actionBar.newTab()
                        .setText(mSectionsPagerAdapter.getPageTitle(i))
                        .setTabListener(this));
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_whatever, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    // When the given tab is selected, switch to the corresponding page in
    // the ViewPager.        
    mViewPager.setCurrentItem(tab.getPosition());

    // store current position in global variable
    currentTab = tab.getPosition()+1; // +1 (!)
    Log.i("TEST onTabSelected currentTab", Integer.toString(currentTab));
}

@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}

@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}

/**
 * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).

        return PlaceholderFragment.newInstance(position + 1);
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        // DEFAULT: return 3;
        return getResources().getStringArray(R.array.whatever_sections).length;
    }

    @Override
    //PETER: this is the names of the pages
    public CharSequence getPageTitle(int position) {
        Locale l = Locale.getDefault();
        // DEFAULT OVERRIDE            
        String[] menuItems = getResources().getStringArray(R.array.whatever_sections);
        return menuItems[position];
    }
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */        
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_whatever, container, false);
        //Peter added to keep reference to View (THIS WORKS)
        int position = getArguments().getInt(ARG_SECTION_NUMBER);
        rootView.setTag(position);
        //Log.i("TEST onCreateView ARGS position: ",Integer.toString(position));

        return rootView;
    }

    //PETER: added, this is apparently the default for setup of the items View components
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        //default code:
        super.onViewCreated(view, savedInstanceState);

        TextView tvWork = (TextView)view.findViewById(R.id.tvWork);
        TextView tvPause = (TextView)view.findViewById(R.id.tvPause);

                tvWork.setText("0:10");
                tvPause.setText("4:00"); // 4 minutes
    }            

 break;

public void onClick (View clickview) throws InterruptedException {
    switch (clickview.getId()) {
        case R.id.textViewStart: // START
            tvStart.setVisibility(View.INVISIBLE);
        case R.id.textViewStop: // STOP
            tvStart.setVisibility(View.VISIBLE);
    } 
}

public void onClick (View clickview) throws InterruptedException {
    switch (clickview.getId()) {
        case R.id.textViewStart: // START
            tvStart.setVisibility(View.INVISIBLE);
            break; //otherwise next cases will all be executed too!
        case R.id.textViewStop: // STOP
            tvStart.setVisibility(View.VISIBLE);
            break;
    } 
}