如何在android中設置關閉文本視圖的能見度？

Question

我正在研究導航抽屜中顯示不同類別的文章應用程序。 我已經爲我的所有片段設置了文本視圖，但是當我的第一個片段位於displaypostion = 0時，我需要隱藏文本視圖，當其他片段打開時，文本視圖屬性將轉至可見。這裏是我的代碼 -

public class MainActivitySlider extends Activity { 
private DrawerLayout mDrawerLayout; 
private ListView mDrawerList; 
private ActionBarDrawerToggle mDrawerToggle; 


// nav drawer title 
private CharSequence mDrawerTitle; 

// used to store app title 
private CharSequence mTitle; 

// slide menu items 
private String[] navMenuTitles; 
private TypedArray navMenuIcons; 

private ArrayList<NavDrawerItem> navDrawerItems; 
private NavDrawerListAdapter adapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main_slider); 
    ActionBar mActionBar = getActionBar(); 
    mActionBar.setDisplayShowHomeEnabled(true); 
    mActionBar.setDisplayShowTitleEnabled(false); 
    LayoutInflater mInflater = LayoutInflater.from(this); 
    View mCustomView = mInflater.inflate(R.layout.customactionbar, null); 
    TextView mTitleTextView = (TextView) mCustomView.findViewById(R.id.title_text); 
    getActionBar().setBackgroundDrawable(
      new ColorDrawable(Color.parseColor("#f8f8f8"))); 
    Typeface fontt = Typeface.createFromAsset(getAssets(), "helvetica.ttf"); 
    mTitleTextView.setTypeface(fontt); 
    mActionBar.setCustomView(mCustomView); 
    mActionBar.setDisplayShowCustomEnabled(true); 
    getActionBar().setIcon(
       new ColorDrawable(getResources().getColor(android.R.color.transparent))); 
    final TextView txt = (TextView)findViewById(R.id.textView1); 
    Typeface fontt1 = Typeface.createFromAsset(getAssets(), "helvetica.ttf"); 
    txt.setTypeface(fontt1); 
    mTitle = mDrawerTitle = getTitle(); 
    // load slide menu items 
    navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items); 

    // nav drawer icons from resources 
    navMenuIcons = getResources() 
      .obtainTypedArray(R.array.nav_drawer_icons); 

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    mDrawerList = (ListView) findViewById(R.id.list_slidermenu); 

    navDrawerItems = new ArrayList<NavDrawerItem>(); 

    // adding nav drawer items to array 
    // Home 
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1))); 
    // Find People 
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1))); 
    // Photos 

    // Recycle the typed array 
    navMenuIcons.recycle(); 

    mDrawerList.setOnItemClickListener(new SlideMenuClickListener()); 

    // setting the nav drawer list adapter 
    adapter = new NavDrawerListAdapter(getApplicationContext(), 
      navDrawerItems); 
    mDrawerList.setAdapter(adapter); 

    // enabling action bar app icon and behaving it as toggle button 
    getActionBar().setDisplayHomeAsUpEnabled(true); 
    getActionBar().setHomeButtonEnabled(true); 

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, 
      R.drawable.dd2, //nav menu toggle icon 
      R.string.app_name, // nav drawer open - description for accessibility 
      R.string.app_name // nav drawer close - description for accessibility 
    ) { 
     public void onDrawerClosed(View view) { 
      if() 
      txt.setText(mTitle); 
      // calling onPrepareOptionsMenu() to show action bar icons 
      invalidateOptionsMenu(); 
     } 

     public void onDrawerOpened(View drawerView) { 
      //txt.setText(mDrawerTitle); 
      // calling onPrepareOptionsMenu() to hide action bar icons 
      invalidateOptionsMenu(); 
     } 
     @Override 
      public void onDrawerSlide(View drawerView, float slideOffset) 
      { 
       // Do nothing 
      } 
    }; 
    mDrawerLayout.setDrawerListener(mDrawerToggle); 
    if (savedInstanceState == null) { 
     // on first time display view for first nav item 
     displayView(0); 
    } 

} 

/** 
* Slide menu item click listener 
* */ 
private class SlideMenuClickListener implements 
     ListView.OnItemClickListener { 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, 
      long id) { 
     // display view for selected nav drawer item 
     displayView(position); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.main3, menu); 

    return super.onCreateOptionsMenu(menu); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // toggle nav drawer on selecting action bar app icon/title 
    if (mDrawerToggle.onOptionsItemSelected(item)) { 
     return true; 
    } 
    // Handle action bar actions click 
    switch (item.getItemId()) { 

    case R.id.action_location_found: 
     hidetext(); 
    return true; 

    default: 
     return super.onOptionsItemSelected(item); 
    } 
} 

private void hidetext() { 
    // TODO Auto-generated method stub 
    Intent i = new Intent(MainActivitySlider.this, SearchResultsActivity 
      .class); 
    startActivity(i); 

} 

/* * 
* Called when invalidateOptionsMenu() is triggered 
*/ 
@Override 
public boolean onPrepareOptionsMenu(Menu menu) { 
    // if nav drawer is opened, hide the action items 
    boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); 
    //menu.findItem(R.id.action_settings).setVisible(!drawerOpen); 
    return super.onPrepareOptionsMenu(menu); 
} 

/** 
* Diplaying fragment view for selected nav drawer list item 
* */ 
private void displayView(int position) { 
    // update the main content by replacing fragments 
    Fragment fragment = null; 
    switch (position) { 
    case 0: 
     fragment = new OneFragment(); 
     break; 
    case 1: 
     fragment = new TwoFragment(); 
     break; 

    default: 
     break; 
    } 

    if (fragment != null) { 
     FragmentManager fragmentManager = getFragmentManager(); 
     fragmentManager.beginTransaction() 
       .replace(R.id.frame_container, fragment).commit(); 

     // update selected item and title, then close the drawer 
     mDrawerList.setItemChecked(position, true); 
     mDrawerList.setSelection(position); 
     setTitle(navMenuTitles[position]); 
     mDrawerLayout.closeDrawer(mDrawerList); 
    } else { 
     // error in creating fragment 
     Log.e("MainActivity", "Error in creating fragment"); 
    } 
} 

@Override 
public void setTitle(CharSequence title) { 
    mTitle = title; 
    getActionBar().setTitle(mTitle); 
} 

/** 
* When using the ActionBarDrawerToggle, you must call it during 
* onPostCreate() and onConfigurationChanged()... 
*/ 

@Override 
protected void onPostCreate(Bundle savedInstanceState) { 
    super.onPostCreate(savedInstanceState); 
    // Sync the toggle state after onRestoreInstanceState has occurred. 
    mDrawerToggle.syncState(); 
} 

@Override 
public void onConfigurationChanged(Configuration newConfig) { 
    super.onConfigurationChanged(newConfig); 
    // Pass any configuration change to the drawer toggls 
    mDrawerToggle.onConfigurationChanged(newConfig); 
} 

} 

Answer 1

考慮，你要隱藏這些mTitleTextView，

switch (position) { 
case 0: 
    mTitleTextView.setText(""); 
    mTitleTextView.setVisibility(View.GONE); 
    fragment = new OneFragment(); 
    break; 
case 1: 
    mTitleTextView.setText(""); 
    mTitleTextView.setVisibility(View.VISIBLE); 
    fragment = new TwoFragment(); 
    break; 

default: 
    break; 
} 

Answer 2

我想你應該看看這個：http://developer.android.com/reference/android/view/View.html#setVisibility(int)

可能的值： View.VISIBLE，View.INVISIBLE，View.GONE