Android实现布局全屏

<style name="FullTheme" parent="@style/BaseFullTheme">
</style>
<style name="BaseFullTheme" parent="@android:style/Theme.DeviceDefault.Light.NoActionBar">
  <item name="android:windowBackground">@android:color/transparent</item>
  <item name="android:colorBackgroundCacheHint">@null</item>
  <item name="android:windowshowWallpaper">true</item>
  <item name="android:windowNoTitle">true</item>
</style>

<style name="FullTheme" parent="@style/BaseFullTheme">
  <item name="android:windowTranslucentStatus">true</item>
  <item name="android:windowTranslucentNavigation">true</item>
</style>

<style name="FullTheme" parent="@style/BaseFullTheme">
  <item name="android:windowTranslucentStatus">false</item>
  <item name="android:windowTranslucentNavigation">false</item>
  <item name="android:windowDrawsSystemBarBackgrounds">true</item>
  <item name="android:statusBarColor">#00000000</item>
  <item name="android:navigationBarColor">#00000000</item>
</style>

<style name="FullTheme" parent="@style/BaseFullTheme">
  <item name="android:colorBackgroundCacheHint">@null</item>
  <item name="android:colorEdgeEffect">#FF757575</item>
  <item name="android:windowActionBar">false</item>
  <item name="android:windowBackground">@android:color/transparent</item>
  <item name="android:windowNoTitle">true</item>
  <item name="android:windowShowWallpaper">true</item>
  <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
  <item name="android:enforceStatusBarContrast">false</item>
  <item name="android:enforceNavigationBarContrast">false</item>


  <item name="android:windowTranslucentStatus">false</item>
  <item name="android:windowTranslucentNavigation">false</item>
  <item name="android:windowDrawsSystemBarBackgrounds">true</item>
  <item name="android:statusBarColor">#00000000</item>
  <item name="android:navigationBarColor">#00000000</item>
</style>

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    android:background="@android:color/holo_blue_bright"<!-- 测试设置的颜色 -->
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="测试"
        >
    </Button>
</LinearLayout>

package com.demo;

import android.app.Activity;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        hideStatusBarNavigationBar();
        setContentView(R.layout.activity_main);
    }

   //关键方法
    private void hideStatusBarNavigationBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
            window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
            window.setNavigationBarColor(Color.TRANSPARENT);
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            getWindow().addFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            getWindow().addFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.demo">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/FullTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <cateGory android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>