Using RelativeLayout instead of CoordinatorLayout as a root layout I can avoid toolbar pushes the content but it pushes a little bit when I hide the status bar.
Now your issue is that the status bar pushes the activity content down when it's shown.
So, to solve this you can make the status bar overlapping with the activity window by adding the below to the activity's onCreate() method
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
}
UPDATE
what to use if build SDK is lower than kitkat?
To support APIs below Kitkat try to create a style.xml file for (v-19) qualifier, and add the below attributes
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowTranslucentNavigation">true</item>
UPDATE: using custom ActionBar
Layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="@+id/content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true"
android:text="@string/long_text"
android:textColor="@android:color/white" />
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:background="#9E0557B5"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</com.google.android.material.appbar.AppBarLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Behavior
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
}
setSupportActionBar(toolbar);
TextView content = findViewById(R.id.content);
content.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (getSupportActionBar().isShowing()) {
getSupportActionBar().hide();
showSystemBar(false);
}
else {
getSupportActionBar().show();
showSystemBar(true);
}
}
});
}
private void showSystemBar(boolean isDisplayed) {
int uiOptions;
if (isDisplayed) {
// show status bar
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
getWindow().getDecorView().setSystemUiVisibility(uiOptions);
}
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
} else {
// hide status bar
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
getWindow().getDecorView().setSystemUiVisibility(uiOptions);
} else {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
}
}
Use NoActionBar theme int style.xml
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
Override style.xml (v.19)
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowTranslucentNavigation">true</item>
</style>
Preview
