实现状态栏全沉浸以及兼容低版本半透明沉浸

下面是java代码：

public class MainActivity extends Activity {

@SuppressLint("InlinedApi")

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

                getWindow().requestFeature(Window.FEATURE_NO_TITLE);

//判断系统版本是否高于andoroid 5.0 LOLLIPOP

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

//状态栏全透明

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);

                }else{

//透明状态栏

getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

//透明导航栏

getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

                }

        setContentView(R.layout.activity_main);

//        //透明状态栏

//        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

//        //透明导航栏

//        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

}

}

注意，在布局文件中，需要将顶部空间属性加上如下内容（粗体部分）：

<?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"

android:background="#ffffff"

tools:context=".MainActivity">

    <TextView
android:fitsSystemWindows="true"

android:clipToPadding="true"

android:background="@drawable/sign_background"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textColor="#ffffff"

android:textSize="22sp"

android:textStyle="bold"

android:text="      Title_bar" />