android：一行代码实现沉浸式布局效果

先看效果
效果一：
效果二：
首先要引入statusbaruitl库
 compile 'com.jaeger.statusbaruitl:library:1.3.5'
在Activity中一行代码实现：
    //目的是让状态栏全透明        StatusBarUtil.setTransparent(MainActivity.this);
这样当前Activity就实现了沉浸式布局效果。
那我们来看看StatusBarUtil的内容吧，注释写的相当详细
package com.jaeger.library;import android.annotation.TargetApi;import android.app.Activity;import android.content.Context;import android.graphics.Color;import android.os.Build;import android.support.v4.widget.DrawerLayout;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.LinearLayout;/** * Created by Jaeger on 16/2/14. * * Email: [e-mail] * GitHub: https://github.com/laobie */public class StatusBarUtil {    public static final int DEFAULT_STATUS_BAR_ALPHA = 112;    /**     * 设置状态栏颜色     *     * @param activity 需要设置的 activity     * @param color    状态栏颜色值     */    public static void setColor(Activity activity, int color) {        setColor(activity, color, DEFAULT_STATUS_BAR_ALPHA);    }    /**     * 设置状态栏颜色     *     * @param activity       需要设置的activity     * @param color          状态栏颜色值     * @param statusBarAlpha 状态栏透明度     */    public static void setColor(Activity activity, int color, int statusBarAlpha) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);            activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            activity.getWindow().setStatusBarColor(calculateStatusColor(color, statusBarAlpha));        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();            int count = decorView.getChildCount();            if (count > 0 && decorView.getChildAt(count - 1) instanceof StatusBarView) {                decorView.getChildAt(count - 1).setBackgroundColor(calculateStatusColor(color, statusBarAlpha));            } else {                StatusBarView statusView = createStatusBarView(activity, color, statusBarAlpha);                decorView.addView(statusView);            }            setRootView(activity);        }    }    /**     * 设置状态栏纯色 不加半透明效果     *     * @param activity 需要设置的 activity     * @param color    状态栏颜色值     */    public static void setColorNoTranslucent(Activity activity, int color) {        setColor(activity, color, 0);    }    /**     * 设置状态栏颜色(5.0以下无半透明效果,不建议使用)     *     * @param activity 需要设置的 activity     * @param color    状态栏颜色值     */    public static void setColorDiff(Activity activity, int color) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {            return;        }        activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);        // 生成一个状态栏大小的矩形        ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();        int count = decorView.getChildCount();        if (count > 0 && decorView.getChildAt(count - 1) instanceof StatusBarView) {            decorView.getChildAt(count - 1).setBackgroundColor(color);        } else {            StatusBarView statusView = createStatusBarView(activity, color);            decorView.addView(statusView);        }        setRootView(activity);    }    /**     * 使状态栏半透明     *     * 适用于图片作为背景的界面,此时需要图片填充到状态栏     *     * @param activity 需要设置的activity     */    public static void setTranslucent(Activity activity) {        setTranslucent(activity, DEFAULT_STATUS_BAR_ALPHA);    }    /**     * 使状态栏半透明     *     * 适用于图片作为背景的界面,此时需要图片填充到状态栏     *     * @param activity       需要设置的activity     * @param statusBarAlpha 状态栏透明度     */    public static void setTranslucent(Activity activity, int statusBarAlpha) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {            return;        }        setTransparent(activity);        addTranslucentView(activity, statusBarAlpha);    }    /**     * 设置状态栏全透明     *     * @param activity 需要设置的activity     */    public static void setTransparent(Activity activity) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {            return;        }        transparentStatusBar(activity);        setRootView(activity);    }    /**     * 使状态栏透明(5.0以上半透明效果,不建议使用)     *     * 适用于图片作为背景的界面,此时需要图片填充到状态栏     *     * @param activity 需要设置的activity     */    public static void setTranslucentDiff(Activity activity) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            // 设置状态栏透明            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            setRootView(activity);        }    }    /**     * 为DrawerLayout 布局设置状态栏变色     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     * @param color        状态栏颜色值     */    public static void setColorForDrawerLayout(Activity activity, DrawerLayout drawerLayout, int color) {        setColorForDrawerLayout(activity, drawerLayout, color, DEFAULT_STATUS_BAR_ALPHA);    }    /**     * 为DrawerLayout 布局设置状态栏颜色,纯色     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     * @param color        状态栏颜色值     */    public static void setColorNoTranslucentForDrawerLayout(Activity activity, DrawerLayout drawerLayout, int color) {        setColorForDrawerLayout(activity, drawerLayout, color, 0);    }    /**     * 为DrawerLayout 布局设置状态栏变色     *     * @param activity       需要设置的activity     * @param drawerLayout   DrawerLayout     * @param color          状态栏颜色值     * @param statusBarAlpha 状态栏透明度     */    public static void setColorForDrawerLayout(Activity activity, DrawerLayout drawerLayout, int color, int statusBarAlpha) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {            return;        }        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);            activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);        } else {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);        }        // 生成一个状态栏大小的矩形        // 添加 statusBarView 到布局中        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);        if (contentLayout.getChildCount() > 0 && contentLayout.getChildAt(0) instanceof StatusBarView) {            contentLayout.getChildAt(0).setBackgroundColor(calculateStatusColor(color, statusBarAlpha));        } else {            StatusBarView statusBarView = createStatusBarView(activity, color);            contentLayout.addView(statusBarView, 0);        }        // 内容布局不是 LinearLayout 时,设置padding top        if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {            contentLayout.getChildAt(1).setPadding(0, getStatusBarHeight(activity), 0, 0);        }        // 设置属性        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);        drawerLayout.setFitsSystemWindows(false);        contentLayout.setFitsSystemWindows(false);        contentLayout.setClipToPadding(true);        drawer.setFitsSystemWindows(false);        addTranslucentView(activity, statusBarAlpha);    }    /**     * 为DrawerLayout 布局设置状态栏变色(5.0以下无半透明效果,不建议使用)     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     * @param color        状态栏颜色值     */    public static void setColorForDrawerLayoutDiff(Activity activity, DrawerLayout drawerLayout, int color) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            // 生成一个状态栏大小的矩形            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);            if (contentLayout.getChildCount() > 0 && contentLayout.getChildAt(0) instanceof StatusBarView) {                contentLayout.getChildAt(0).setBackgroundColor(calculateStatusColor(color, DEFAULT_STATUS_BAR_ALPHA));            } else {                // 添加 statusBarView 到布局中                StatusBarView statusBarView = createStatusBarView(activity, color);                contentLayout.addView(statusBarView, 0);            }            // 内容布局不是 LinearLayout 时,设置padding top            if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {                contentLayout.getChildAt(1).setPadding(0, getStatusBarHeight(activity), 0, 0);            }            // 设置属性            ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);            drawerLayout.setFitsSystemWindows(false);            contentLayout.setFitsSystemWindows(false);            contentLayout.setClipToPadding(true);            drawer.setFitsSystemWindows(false);        }    }    /**     * 为 DrawerLayout 布局设置状态栏透明     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     */    public static void setTranslucentForDrawerLayout(Activity activity, DrawerLayout drawerLayout) {        setTranslucentForDrawerLayout(activity, drawerLayout, DEFAULT_STATUS_BAR_ALPHA);    }    /**     * 为 DrawerLayout 布局设置状态栏透明     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     */    public static void setTranslucentForDrawerLayout(Activity activity, DrawerLayout drawerLayout, int statusBarAlpha) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {            return;        }        setTransparentForDrawerLayout(activity, drawerLayout);        addTranslucentView(activity, statusBarAlpha);    }    /**     * 为 DrawerLayout 布局设置状态栏透明     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     */    public static void setTransparentForDrawerLayout(Activity activity, DrawerLayout drawerLayout) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {            return;        }        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);            activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);        } else {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);        }        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);        // 内容布局不是 LinearLayout 时,设置padding top        if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {            contentLayout.getChildAt(1).setPadding(0, getStatusBarHeight(activity), 0, 0);        }        // 设置属性        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);        drawerLayout.setFitsSystemWindows(false);        contentLayout.setFitsSystemWindows(false);        contentLayout.setClipToPadding(true);        drawer.setFitsSystemWindows(false);    }    /**     * 为 DrawerLayout 布局设置状态栏透明(5.0以上半透明效果,不建议使用)     *     * @param activity     需要设置的activity     * @param drawerLayout DrawerLayout     */    public static void setTranslucentForDrawerLayoutDiff(Activity activity, DrawerLayout drawerLayout) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            // 设置状态栏透明            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            // 设置内容布局属性            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);            contentLayout.setFitsSystemWindows(true);            contentLayout.setClipToPadding(true);            // 设置抽屉布局属性            ViewGroup vg = (ViewGroup) drawerLayout.getChildAt(1);            vg.setFitsSystemWindows(false);            // 设置 DrawerLayout 属性            drawerLayout.setFitsSystemWindows(false);        }    }    /**     * 添加半透明矩形条     *     * @param activity       需要设置的 activity     * @param statusBarAlpha 透明值     */    private static void addTranslucentView(Activity activity, int statusBarAlpha) {        ViewGroup contentView = (ViewGroup) activity.findViewById(android.R.id.content);        // 移除半透明矩形,以免叠加        if (contentView.getChildCount() > 1) {            contentView.getChildAt(1).setBackgroundColor(Color.argb(statusBarAlpha, 0, 0, 0));        } else {            contentView.addView(createTranslucentStatusBarView(activity, statusBarAlpha));        }    }    /**     * 生成一个和状态栏大小相同的彩色矩形条     *     * @param activity 需要设置的 activity     * @param color    状态栏颜色值     * @return 状态栏矩形条     */    private static StatusBarView createStatusBarView(Activity activity, int color) {        // 绘制一个和状态栏一样高的矩形        StatusBarView statusBarView = new StatusBarView(activity);        LinearLayout.LayoutParams params =            new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, getStatusBarHeight(activity));        statusBarView.setLayoutParams(params);        statusBarView.setBackgroundColor(color);        return statusBarView;    }    /**     * 生成一个和状态栏大小相同的半透明矩形条     *     * @param activity 需要设置的activity     * @param color    状态栏颜色值     * @param alpha    透明值     * @return 状态栏矩形条     */    private static StatusBarView createStatusBarView(Activity activity, int color, int alpha) {        // 绘制一个和状态栏一样高的矩形        StatusBarView statusBarView = new StatusBarView(activity);        LinearLayout.LayoutParams params =            new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, getStatusBarHeight(activity));        statusBarView.setLayoutParams(params);        statusBarView.setBackgroundColor(calculateStatusColor(color, alpha));        return statusBarView;    }    /**     * 设置根布局参数     */    private static void setRootView(Activity activity) {        ViewGroup rootView = (ViewGroup) ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);        rootView.setFitsSystemWindows(true);        rootView.setClipToPadding(true);    }    /**     * 使状态栏透明     */    @TargetApi(Build.VERSION_CODES.KITKAT)    private static void transparentStatusBar(Activity activity) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);            activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);        } else {            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);        }    }    /**     * 创建半透明矩形 View     *     * @param alpha 透明值     * @return 半透明 View     */    private static StatusBarView createTranslucentStatusBarView(Activity activity, int alpha) {        // 绘制一个和状态栏一样高的矩形        StatusBarView statusBarView = new StatusBarView(activity);        LinearLayout.LayoutParams params =            new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, getStatusBarHeight(activity));        statusBarView.setLayoutParams(params);        statusBarView.setBackgroundColor(Color.argb(alpha, 0, 0, 0));        return statusBarView;    }    /**     * 获取状态栏高度     *     * @param context context     * @return 状态栏高度     */    private static int getStatusBarHeight(Context context) {        // 获得状态栏高度        int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");        return context.getResources().getDimensionPixelSize(resourceId);    }    /**     * 计算状态栏颜色     *     * @param color color值     * @param alpha alpha值     * @return 最终的状态栏颜色     */    private static int calculateStatusColor(int color, int alpha) {        float a = 1 - alpha / 255f;        int red = color >> 16 & 0xff;        int green = color >> 8 & 0xff;        int blue = color & 0xff;        red = (int) (red * a + 0.5);        green = (int) (green * a + 0.5);        blue = (int) (blue * a + 0.5);        return 0xff << 24 | red << 16 | green << 8 | blue;    }    /**     * 为有 ImageView 的Activity 添加半透明状态栏     *     * @param activity 需要设置的Activity     */    private static void setTranslucentForImageView(Activity activity) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            activity.getWindow()                .setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {                addTranslucentView(activity, DEFAULT_STATUS_BAR_ALPHA);            }        }    }}


作者：黄晓果
链接：http://www.jianshu.com/p/6adb44159079
來源：简书
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