Android透明状态栏（4.4以上版本）

关键代码：

protected void initSystemBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            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 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            Window window = getWindow();
            // Translucent status bar
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // Translucent navigation bar
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        }
    }
或者在主题中配置
 <!-- 透明状态栏主题 style.xml-->
    <style name="AppTheme.MyAppTheme">
        <!-- Customize your theme here. -->
        <item name="android:fitsSystemWindows">false</item>
    </style>
    <!-- 透明状态栏主题 style.xml(v19)-->
<style name="AppTheme.MyAppTheme">
        <!-- Customize your theme here. -->
        <item name="android:fitsSystemWindows">false</item>
        <item name="android:windowTranslucentStatus">true</item>
    </style>
       <!-- 透明状态栏主题 style.xml(v21)-->
 <style name="AppTheme.MyAppTheme">
        <!-- Customize your theme here. -->
        <item name="android:fitsSystemWindows">false</item>
        <item name="android:statusBarColor">@color/transparent</item>
        <item name="android:windowTranslucentStatus">true</item>
    </style>

问题：
1.状态栏透明之后，布局会统一上移，所以需要在第一个布局上面加paddingTop,一般导航栏写成一个控件TopBar,然后每个页面去引用，可以建values-v19 和values-21文件夹，在dimens.xml里面去配置TopBar的高度和paddingTop
2.透明状态栏会与底部输入框有冲突，导致adjustResize不起作用，输入框不能被软键盘弹起来，解决方法是重写activity的根布局,然后在根布局上设置fitSystemWindows=”true”,这个忘了设置是不行的

/**
 * Created by star on 2017/1/20
 * 功能: 解决透明状态栏和底部输入框的冲突问题，将activity的根布局替换成该类，需要什么布局就继承哪个ViewGroup,比如需要RelativeLayout就extends RelativeLayout
 */
public class CustomInsetsLinearLayout extends LinearLayout {
    private int[] mInsets = new int[4];

    public CustomInsetsLinearLayout(Context context) {
        super(context);
    }

    public CustomInsetsLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomInsetsLinearLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public final int[] getInsets() {
        return mInsets;
    }

    @Override
    protected final boolean fitSystemWindows(Rect insets) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // Intentionally do not modify the bottom inset. For some reason,
            // if the bottom inset is modified, window resizing stops working.

            mInsets[0] = insets.left;
            mInsets[1] = insets.top;
            mInsets[2] = insets.right;

            insets.left = 0;
            insets.top = 0;
            insets.right = 0;
        }

        return super.fitSystemWindows(insets);
    }

    @Override
    public final WindowInsets onApplyWindowInsets(WindowInsets insets) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
            mInsets[0] = insets.getSystemWindowInsetLeft();
            mInsets[1] = insets.getSystemWindowInsetTop();
            mInsets[2] = insets.getSystemWindowInsetRight();
            return super.onApplyWindowInsets(insets.replaceSystemWindowInsets(0, 0, 0,
                    insets.getSystemWindowInsetBottom()));
        } else {
            return insets;
        }
    }
}

fitSystemWindows=”true”意思是布局是否从状态栏下面开始排列
clipToPadding默认为true,如果最上面布局有paddingTop,例如ListView,则表示滑动的时候paddingTop能否被滑走，true为不滑走，false为滑走
状态栏着色

public static void setStatusBarColor(Window window, int color, boolean isAddView) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            //5.0及以上，不设置透明状态栏，设置会有半透明阴影
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.setStatusBarColor(color);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            if (isAddView) {
                View statusBarView = new View(window.getContext());
                LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                        getStatusBarHeight(window.getContext()));
                statusBarView.setLayoutParams(params);
                statusBarView.setBackgroundColor(color);
                ViewGroup decorView = (ViewGroup) window.getDecorView();
                decorView.addView(statusBarView);
            }
            ViewGroup contentView = (ViewGroup) window.findViewById(android.R.id.content);
            View rootView = contentView.getChildAt(0);
            if (rootView instanceof ViewGroup) {
                rootView.setFitsSystemWindows(true);
            }
        }
    }

Android透明状态栏（4.4以上版本）

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