本文介绍了如何以编程方式显示和隐藏一项活动的操作栏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个活动，其中我需要在登录界面上隐藏动作栏，然后登录后将显示动作栏.我只有一个活动.如果我将getActionBar放在主要活动上，则会给我错误.
i got this one activity wherein i need to hide actionbar on the login interface then once login it will show the action bar.i got one activity only. if i put getActionBar on the main activity it gives me error.
此处是代码:
@SuppressLint("NewApi")
public class MainActivity extends Activity {
ViewPager viewPager;
PagerAdapter adapter;
ProgressDialog pDialog;
ImageView imgLogo;
Menu menu1;
ImageView header;
ImageView footer;
int[] bookCover = new int[] {
R.drawable.image1,
R.drawable.image2,
R.drawable.image3,
};
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupFacebookConnect(savedInstanceState);
imgLogo = (ImageView)findViewById(R.id.logo);
share = (ImageView) findViewById(R.id.share);
// Locate the ViewPager in viewpager_main.xml
viewPager = (ViewPager) findViewById(R.id.pager);
// Pass results to ViewPagerAdapter Class
adapter = new ViewPagerAdapter(this, bookCover);
// Binds the Adapter to the ViewPager
viewPager.setAdapter(adapter);
final OnPageChangeListener pageChangeListener = new ViewPager.SimpleOnPageChangeListener() {
@SuppressLint("NewApi")
@Override
public void onPageSelected(int position) {
final int pos = position;
share.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch(pos) {
case 0:
break;
case 1:
break;
case 2:
break;
case 3:
break;
}
}
});
// When changing pages, reset the action bar actions since they are dependent
// on which page is currently active. An alternative approach is to have each
// fragment expose actions itself (rather than the activity exposing actions),
// but for simplicity, the activity provides the actions in this sample.
invalidateOptionsMenu();
}
};
viewPager.setOnPageChangeListener(pageChangeListener);
pageChangeListener.onPageSelected(0);
facebook_connect = (Button) findViewById(R.id.facebook_login);
facebook_connect.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if (isFacebookConnected()) {
disConnectFacebook();
} else {
connectFacebook();
}
}
});
// Shared Preferences
mSharedPreferences = getApplicationContext().getSharedPreferences("MyPref", 0);
}
@SuppressLint({ "InlinedApi", "NewApi" })
@Override
public boolean onCreateOptionsMenu(Menu menu) {
this.menu1 = menu;
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.main, menu);
menu.findItem(R.id.action_previous).setEnabled(viewPager.getCurrentItem() > 0);
// Add either a "next" or "finish" button to the action bar, depending on which page
// is currently selected.
MenuItem item = menu.add(Menu.NONE, R.id.action_next, Menu.NONE,(viewPager.getCurrentItem() == adapter.getCount() - 1)
? R.string.action_finish
: R.string.action_next);
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int itemId = item.getItemId();
if (itemId == R.id.action_previous) {
// Go to the previous step in the wizard. If there is no previous step,
// setCurrentItem will do nothing.
viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);
return true;
} else if (itemId == R.id.action_next) {
// Advance to the next step0.0 in the wizard. If there is no next step, setCurrentItem
// will do nothing.
viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);
return true;
}
return super.onOptionsItemSelected(item);
}
private Session.StatusCallback statusCallback = new FBSessionStatus();
public void setupFacebookConnect(Bundle savedInstanceState) {
Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);
Session session = Session.getActiveSession();
if (session == null) {
if (savedInstanceState != null) {
session = Session.restoreSession(this, null, statusCallback,
savedInstanceState);
}
if (session == null) {
session = new Session(this);
}
Session.setActiveSession(session);
if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
session.openForRead(new Session.OpenRequest(this)
.setCallback(statusCallback));
}
}
}
public boolean isFacebookConnected() {
Session session = Session.getActiveSession();
return (session.isOpened()) ? true : false;
}
public void connectFacebook() {
Session session = Session.getActiveSession();
if (!session.isOpened() && !session.isClosed()) {
getActionBar().show();
session.openForRead(new Session.OpenRequest(this)
.setCallback(statusCallback));
} else {
Session.openActiveSession(this, true, statusCallback);
}
}
@Override
public void onStart() {
super.onStart();
Session.getActiveSession().addCallback(statusCallback);
}
@Override
public void onStop() {
super.onStop();
Session.getActiveSession().removeCallback(statusCallback);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Session session = Session.getActiveSession();
Session.saveSession(session, outState);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode,
resultCode, data);
}
public class FBSessionStatus implements Session.StatusCallback {
@Override
public void call(Session session, SessionState state, Exception exception) {
onSessionStateChange(session, state, exception);
}
}
public void disConnectFacebook() {
Session session = Session.getActiveSession();
if (!session.isClosed()) {
session.closeAndClearTokenInformation();
viewPager.setVisibility(View.INVISIBLE);
MenuItem item1 = menu1.findItem(R.id.action_next);
item1.setVisible(false);
MenuItem item2 = menu1.findItem(R.id.action_previous);
item2.setVisible(false);
imgLogo.setVisibility(View.VISIBLE);
//btnLoginTwitter.setVisibility(View.VISIBLE);
share.setVisibility(View.INVISIBLE);
}
}
private void onSessionStateChange(Session session, SessionState state, Exception exception) {
// Check if the user is authenticated and
// a deep link needs to be handled.
if (state.isOpened()) {
MenuItem item1 = menu1.findItem(R.id.action_next);
item1.setVisible(true);
MenuItem item2 = menu1.findItem(R.id.action_previous);
item2.setVisible(true);
//getActionBar().show();
share.setVisibility(View.VISIBLE);
//btnLoginTwitter.setVisibility(View.INVISIBLE);
//btnShare.setVisibility(View.VISIBLE);
viewPager.setVisibility(View.VISIBLE);
imgLogo.setVisibility(View.INVISIBLE);
}
}
public void shareImage(String name, String caption, String desc, String link, String picture ) {
Bundle params = new Bundle();
params.putString("name", name);
params.putString("caption", caption);
params.putString("description", desc);
params.putString("link", link);
//params.putString("picture", "https://www.facebook.com/photo.php?fbid=10203610233686079&set=a.10203610230766006.1073741829.1523023247&type=1&theater");
params.putString("picture", picture);
WebDialog feedDialog = (
new WebDialog.FeedDialogBuilder(MainActivity.this,
Session.getActiveSession(),
params))
.setOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(Bundle values,
FacebookException error) {
if (error == null) {
// When the story is posted, echo the success
// and the post Id.
final String postId = values.getString("post_id");
if (postId != null) {
Toast.makeText(MainActivity.this,
"Successfuly posted!",
Toast.LENGTH_SHORT).show();
} else {
// User clicked the Cancel button
Toast.makeText(MainActivity.this,
"Publish cancelled",
Toast.LENGTH_SHORT).show();
}
} else if (error instanceof FacebookOperationCanceledException) {
// User clicked the "x" button
Toast.makeText(MainActivity.this,
"Publish cancelled",
Toast.LENGTH_SHORT).show();
} else {
// Generic, ex: network error
Toast.makeText(MainActivity.this,
"Error posting story",
Toast.LENGTH_SHORT).show();
}
}
})
.build();
feedDialog.show();
}
@SuppressWarnings("unused")
private boolean isSubsetOf(Collection<String> subset, Collection<String> superset) {
for (String string : subset) {
if (!superset.contains(string)) {
return false;
}
}
return true;
}
}
推荐答案
用于扩展活动的类:
getActionBar().hide();
getActionBar().show();
对于扩展 AppCompatActivity 的类:
getSupportActionBar().hide();
getSupportActionBar().show();
这篇关于如何以编程方式显示和隐藏一项活动的操作栏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！