Please notice that it can save state for configuration change only: if the app is killed or finished, then re-started, it will return to AndroidManifest.xml set visibility.
package com.example.androidactionbar;
import android.os.Bundle;
import android.app.ActionBar;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonToggleActionBar = (Button)findViewById(R.id.toggleactionbar);
buttonToggleActionBar.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
ActionBar myActionBar = getActionBar();
boolean myActionBarisShowing = myActionBar.isShowing();
if(myActionBarisShowing){
myActionBar.hide();
Toast.makeText(getApplicationContext(),
"Hide ActionBar",
Toast.LENGTH_LONG).show();
}else{
myActionBar.show();
Toast.makeText(getApplicationContext(),
"Show ActionBar",
Toast.LENGTH_LONG).show();
}
}});
Button buttonFinish = (Button)findViewById(R.id.finish);
buttonFinish.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
finish();
}});
if (savedInstanceState != null) {
Boolean savedActionBarisShowing =
savedInstanceState.getBoolean("KEY_ACTIONBAR_ISSHOWING", true);
if(savedActionBarisShowing){
getActionBar().show();
}else{
getActionBar().hide();
}
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean("KEY_ACTIONBAR_ISSHOWING", getActionBar().isShowing());
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/toggleactionbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Toggle ActionBar" />
<Button
android:id="@+id/finish"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="finish()" />
</LinearLayout>
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