了解真正的“沉浸式”模式

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<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout

    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">

    <ImageView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@mipmap/ver_bg"

        android:scaleType="centerCrop"/>

</RelativeLayout>

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import android.graphics.Color;

import android.os.Build;

import android.os.Bundle;

import android.support.v7.app.ActionBar;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

public class MainActivity   extends AppCompatActivity   {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        immerseView();

    }

    private void immerseView() {

        if (Build.VERSION.SDK_INT >= 21) {

            View   decorView = getWindow().getDecorView();

            int option = View.SYSTEM_UI_FLAG_FULLSCREEN |   View.SYSTEM_UI_FLAG_LAYOUT_STABLE;

            decorView.setSystemUiVisibility(option);

            getWindow().setNavigationBarColor(Color.TRANSPARENT);//将导航栏颜色设置为透明

            getWindow().setStatusBarColor(Color.TRANSPARENT);//将状态栏颜色设置为透明

        }

        ActionBar   actionBar = getSupportActionBar();

        actionBar.hide();//隐藏ActionBar

    }

}

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import android.os.Build;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

public class MainActivity   extends AppCompatActivity   {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    @Override

    public void onWindowFocusChanged(boolean hasFocus) {

        super.onWindowFocusChanged(hasFocus);

        if (hasFocus &&   Build.VERSION.SDK_INT >= 19) {

            View   decorView = getWindow().getDecorView();

            decorView.setSystemUiVisibility(

                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE

                    |   View.SYSTEM_UI_FLAG_HIDE_NAVIGATION

                    |   View.SYSTEM_UI_FLAG_FULLSCREEN

                    |   View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

                    |   View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

                    |   View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY

            );

        }

    }

}

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<activity android:name=".MainActivity" android:screenOrientation="landscape">

            <intent-filter>

                <action android:name="android.intent.action.MAIN"/>

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

            </intent-filter>

        </activity>