Android 如何以编程方式显示和隐藏一项活动的操作栏
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时间：2020-08-20 06:31:46 来源:igfitidea点击:
how to programmatically show and hide action bar on one activity
提问by jovs
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.
我得到了一项活动，其中我需要在登录界面上隐藏操作栏，然后一旦登录，它将显示操作栏。我只有一项活动。如果我将 getActionBar 放在主要活动上，它会给我错误。
heres the code:
继承人的代码：
@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;
}
}
回答by prat3ik-patel
For class extending Activity:
对于类扩展Activity：
getActionBar().hide();
getActionBar().show();
For class extending AppCompatActivity:
对于扩展AppCompatActivity 的类：
getSupportActionBar().hide();
getSupportActionBar().show();
回答by agamov
Very simple.
很简单。
getActionbar().hide();
getActionbar().show();
回答by IntelliJ Amiya
You can hide/Showthe status bar on Android 4.1 (API level 16) and higher by using hide()/show()functionality
您可以hide/Show使用hide()/show()功能在 Android 4.1（API 级别 16）及更高版本上显示状态栏
// Hide the status bar.
ActionBar actionBar = getActionBar();
actionBar.hide();
// Show the status bar.
actionBar.show();
For more details you can visit here https://developer.android.com/training/system-ui/status.html
有关更多详细信息，您可以访问这里https://developer.android.com/training/system-ui/status.html
回答by Null Pointer Exception
Change your Theme from the manifest file for the desire Activity...
从清单文件中更改您的主题，以获得所需的活动...
Theme.AppCompat.NoActionBar
or
Theme.AppCompat.Light.NoActionBar
Programmatically you can Invisible your Toolbar by this line of codes
以编程方式，您可以通过这行代码隐藏您的工具栏
if you extend your activity by Activity class then use below line of code to show or hide the Toolbar
如果您通过 Activity 类扩展您的活动，则使用下面的代码行来显示或隐藏工具栏
getActionBar().hide();
getActionBar().show();
and if you extend your activty from AppCompact Activity then use
如果您从 AppCompact Activity 扩展您的活动，则使用
For class extending Activity :
对于类扩展 Activity ：
getActionBar().hide(); getActionBar().show(); For class extending AppCompatActivity :
getActionBar().hide(); getActionBar().show(); 对于扩展 AppCompatActivity 的类：
getSupportActionBar().hide();
getSupportActionBar().show();
回答by sandalone
The ActionBarusually exists along Fragmentsso from the Activityyou can hide it
在ActionBar通常沿着存在Fragments所以从Activity您可以将其隐藏
getActionbar().hide();
getActionbar().show();
and from the Fragmentyou can do it
从Fragment你可以做到
getActivity().getActionbar().hide();
getActivity().getActionbar().show();
回答by AnAIDE
you can save it use sharedpreference like below
您可以使用如下所示的共享首选项保存它
public class MainActivity extends Activity
{
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
loadActionbar();
btn=(Button)findViewById(R.id.mainButton1);
btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View p1)
{
if(getActionBar().isShowing()==true){
getActionBar().hide();
saveActionBar();
}
else{
getActionBar().show();
saveActionBar();
}
}
})
public void saveActionBar(){
SharedPreferences pref=PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor=pref.edit();
editor.putBoolean("save",getActionBar().isShowing());
editor.apply();
}
public void loadActionbar(){
SharedPreferences pref=PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
boolean i=pref.getBoolean("save",getActionBar().isShowing());
if(i!=true){
getActionBar().hide();
}
else
getActionBar().show();
}
回答by scottish.samba
This just worked for me:
这对我有用：
supportActionBar?.hide()
