How To Show and hide ActionBar with AppCompat v.7

Question

I have a simple app that displays text.

The app starts with a main screen with a few options (ex. an info button that leads to info about the app, a browse button th

Answer 1

Extend you activity as AppCompatActivity and then use action bar as:-

getSupportActionBar().hide();  // for hiding
getSupportActionBar().show();  // for showing

Answer 2

In onCreate method, after setContentView, use this simply to show or hide for each class.

getSupportActionBar().hide();
getSupportActionBar().show();

If you want to set title,

getSupportActionBar().setTitle("This is ToolBar");

Answer 3

If you are trying to show/hide the ActionBar of an INTENT with AppCompatActivity and you get the following issues:

• pointer null exception ...
• thread issue ...

Follow these steps to access to the same relevant thread into the intent:

// 1) Calling the intent in the "main activity"
Intent intent = new Intent(context, YourClass.class);
startActivity(intent);

// 2) Get the context in your "Intent activity"
public class YourClass extends AppCompatActivity {
YourClass mContext;

@Override
protected void onCreate(Bundle savedInstanceState) {
    mContext = this;
}

// 3) Hide/Show Action bar from a method
public void yourMethod(YourClass mContext){

    mContext.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mContext.getSupportActionBar().hide();
        }
    });

}

Answer 4

<style name="Theme.AppCompat.NoActionBar" parent="Theme.AppCompat.Light">
    <item name="android:windowActionBar">false</item>  
    <item name="android:windowNoTitle">true</item>
</style>

remove android in item windowActionbar.just like follow:

<style name="Theme.AppCompat.NoActionBar" parent="Theme.AppCompat.Light">
    <item name="windowActionBar">false</item>  
    <item name="android:windowNoTitle">true</item>
</style>

I hope it can help you.

Answer 5

AppCompatActivity has its own embedded toolbar. You dont need to use extra toolbar definition in your main xml.

just call getSupportActionBar().show()

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getSupportActionBar().show();
}

public boolean onCreateOptionsMenu(Menu menu)
{
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return super.onCreateOptionsMenu(menu);
}

@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) {

        TextView text1=(TextView)findViewById(R.id.textView);
        text1.setText("I changed the text!");

    }

    return super.onOptionsItemSelected(item);
}

Answer 6

Dismiss ToolBar for all activities with AppTheme:
styles.xml:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"><!-- .NoActionBar -->