删除 Android 应用程序标题栏

In the graphical editor, make sure you have chosen your theme at the top.

1. In the Design Tab, click on the AppTheme Button

2. Choose the option "AppCompat.Light.NoActionBar"

3. Click OK.

in the graphical layout, you can choose the theme on the toolbar. (the one that looks like a star).

choose the NoTitleBar and have fun.

Use this to remove title from android app in your Androidmainfest.xml

android:theme="@android:style/Theme.NoTitleBar"

or you can use this in your activity

requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);

for Title Bar

requestWindowFeature(Window.FEATURE_NO_TITLE);

for fullscreen

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);

Place this after

super.onCreate(savedInstanceState);

but before

setContentView(R.layout.xml);

This worked for me.try this

Use this Remove title and image from top.

Before:

setContentView(R.layout.actii);

Write this code:

requestWindowFeature(Window.FEATURE_NO_TITLE);

If you have import android.support.v7.app.ActionBarActivity; and your class extends ActionBarActivity then use this in your OnCreate:

android.support.v7.app.ActionBar AB=getSupportActionBar();
AB.hide();

I was able to do this for Android 2.1 devices and above using an App Compatibility library theme applied to the app element in the manifest:

<application
...
android:theme="@style/AppTheme" />


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

Note: You will need to include the com.android.support:appcompat-v7library in your build.gradle file

If you use AppCompat v7, v21

getSupportActionBar().setDisplayShowTitleEnabled(false);

Just change the theme in the design view of your activity to NoActionBar like the one here

There are two options I'd like to present:

1. Change the visibility of the SupportActionBar in JAVA code
2. Choose another Style in your project's style.xml

1: Add getSupportActionBar().hide(); to your onCreate method.

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.activity_main);
}

2: Another option is to change the style of your Application. Check out the styles.xml in "app->res->values" and change

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>


<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>

Simple way is to put this in your onCreate():

// Java
getSupportActionBar().hide();

// Kotlin
supportActionBar?.hide()

Just use this

getSupportActionBar().hide();

It's obvious, but the App Theme selection in design is just for display a draft during layout edition, is not related to real app looking in cell phone.

Just change the manifest file (AndroidManifest.xml) is not enough because the style need to be predefined is styles.xml. Also is useless change the layout files.

All proposed solution in Java or Kotlin has failed for me. Some of them crash the app. And if one never (like me) uses the title bar in app, the static solution is cleaner.

For me the only solution that works in 2019 (Android Studio 3.4.1) is:

in styles.xml (under app/res/values) add the lines:

   <style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>

After in AndroidManifest.xml (under app/manifests)

Replace

android:theme="@style/AppTheme">

by

android:theme="@style/AppTheme.NoActionBar">

In your res/values/styles.xml of modern Android Studio projects (2019/2020) you should be able to change the default parent theme

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

I went one step further and had it look like this

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:windowFullscreen">true</item>
</style>

This is based on the code generated from the Microsoft PWA builder https://www.pwabuilder.com/

Title bar in android is called Action bar. So if you want to remove it from any specific activity, go to AndroidManifest.xml and add the theme type. Such as android:theme="@style/Theme.AppCompat.Light.NoActionBar".

Example:

<activity
android:name=".SplashActivity"
android:noHistory="true"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />


<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

To open the Design window: res->layouts->activity_manifest.xml then click on the "Design" button, next to "Code" and "Split". On the TOP LEFT Corner.