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教你自己写Android第三方库详解手机开发

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其实Android studio的出现很大程度上方便了我们Android开发人员，今天我们说说怎么构建我们自己的库。

依次按File->New Moudle->android Library就好了，这就构建了我们自己的第三方库，正好最近项目用到了沉侵式状态栏，我们就以这个未为例子来说明吧。

1，新建我们自己的Library

教你自己写Android第三方库详解手机开发

教你自己写Android第三方库详解手机开发

2，编写库库代码

这里比较简单，就是实现一个简单的沉侵式状态栏。沉侵式状态栏默认支持到4.4版本（5.0以后是系统默认支持的，对于5.0之前的是通过绘制一个和状态栏大小相等的矩形）。

 public static void setColor(Activity activity, int color, int statusBarAlpha) { 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
            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); 
            // 生成一个状态栏大小的矩形 
            View statusView = createStatusBarView(activity, color, statusBarAlpha); 
            // 添加 statusView 到布局中 
            ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView(); 
            decorView.addView(statusView); 
            setRootView(activity); 
        } 
    }

对于5.0及以上版本，我们直接调用Winows的setStatusBarColor（）即可。 

activity.getWindow().setStatusBarColor(calculateStatusColor(color, statusBarAlpha));

这里有一个方法是技术状态栏的颜色。返回int 

 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; 
    }

而对于5.0以下的版本，是通过绘制一个和状态栏一样的矩形。然后将这个view添加到Window容器中 

  private static View createStatusBarView(Activity activity, int color, int alpha) { 
        View statusBarView = new View(activity); 
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 
                getStatusBarHeight(activity)); 
        statusBarView.setLayoutParams(params); 
        statusBarView.setBackgroundColor(calculateStatusColor(color, alpha)); 
        return statusBarView; 
    }

这里有一个核心的方法： 

  private static void setRootView(Activity activity) { 
        ViewGroup rootView = (ViewGroup) ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0); 
        rootView.setFitsSystemWindows(true); 
        rootView.setClipToPadding(true); 
    }

3,.1设置透明度 

 public static void setTranslucent(Activity activity, int statusBarAlpha) { 
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) { 
            return; 
        } 
        setTransparent(activity); 
        addTranslucentView(activity, statusBarAlpha); 
    }

同上这里也是分5.0以上和以下的 

 private static void transparentStatusBar(Activity activity) { 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
            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); 
        } 
    }

最后贴上全部代码：

public class TintBarUtil { 
//alpha(0-255) 
public static final int DEFAULT_STATUS_BAR_ALPHA = 112; 
/** 
* 设置状态栏颜色 
*/ 
public static void setColor(Activity activity, int color) { 
setColor(activity, color, DEFAULT_STATUS_BAR_ALPHA); 
} 
/** 
* 设置状态栏颜色 
*/ 
public static void setColor(Activity activity, int color, int statusBarAlpha) { 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
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); 
// 生成一个状态栏大小的矩形 
View statusView = createStatusBarView(activity, color, statusBarAlpha); 
// 添加 statusView 到布局中 
ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView(); 
decorView.addView(statusView); 
setRootView(activity); 
} 
} 
/** 
* 设置状态栏纯色 不加半透明效果 
*/ 
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) 
*/ 
public static void setColorHalf(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 
View statusView = createStatusBarView(activity, color); 
// 添加 statusView 到布局中 
ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView(); 
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 
*/ 
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 
*/ 
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 
*/ 
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) 
*/ 
public static void setTranslucentHalf(Activity activity) { 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); 
setRootView(activity); 
} 
} 
/** 
* 为DrawerLayout 布局设置状态栏变色 
*/ 
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 
*/ 
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 
*/ 
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().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); 
activity.getWindow().setStatusBarColor(Color.TRANSPARENT); 
} else { 
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); 
} 
View statusBarView = createStatusBarView(activity, color); 
ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0); 
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) 
*/ 
public static void setColorForDrawerLayoutHalf(Activity activity, DrawerLayout drawerLayout, int color) { 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); 
View statusBarView = createStatusBarView(activity, color); 
ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0); 
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 
*/ 
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 
*/ 
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 
*/ 
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().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) 
*/ 
public static void setTranslucentForDrawerLayoutHalf(Activity activity, DrawerLayout drawerLayout) { 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); 
ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0); 
contentLayout.setFitsSystemWindows(true); 
contentLayout.setClipToPadding(true); 
ViewGroup vg = (ViewGroup) drawerLayout.getChildAt(1); 
vg.setFitsSystemWindows(false); 
drawerLayout.setFitsSystemWindows(false); 
} 
} 
/** 
* 添加半透明矩形条 
*/ 
private static void addTranslucentView(Activity activity, int statusBarAlpha) { 
ViewGroup contentView = (ViewGroup) activity.findViewById(android.R.id.content); 
if (contentView.getChildCount() > 1) { 
contentView.removeViewAt(1); 
} 
contentView.addView(createTranslucentStatusBarView(activity, statusBarAlpha)); 
} 
/** 
* 生成一个和状态栏大小相同的彩色矩形条 
*/ 
private static View createStatusBarView(Activity activity, int color) { 
View statusBarView = new View(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 
*/ 
private static View createStatusBarView(Activity activity, int color, int alpha) { 
View statusBarView = new View(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().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 
*/ 
private static View createTranslucentStatusBarView(Activity activity, int alpha) { 
View statusBarView = new View(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 
*/ 
private static int getStatusBarHeight(Context context) { 
int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android"); 
return context.getResources().getDimensionPixelSize(resourceId); 
} 
/** 
* 计算状态栏颜色 
*/ 
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; 
} 
}

4，应用

我们在自己的项目中添加支持，setting.gradle和build.gradle。现在就可以使用我们自己的库了。

教你自己写Android第三方库详解手机开发

5，打jar包，打aar包我这里就不讲了，比较简单

5.1 编写Lib的build.gradle

教你自己写Android第三方库详解手机开发

加上如下脚步代码：

task makeJar(type: Copy) { 
delete 'build/libs/tintbarutils.jar' 
from('build/intermediates/bundles/release/') 
into('build/libs/')     include('classes.jar') 
rename ('classes.jar', 'tintbarutils.jar') 
} 
makeJar.dependsOn(build) 
//在终端执行生成JAR包 
// gradlew makeJar

这里xx.jar改为你最近的就好了哦

5.2 在Teminal中输入gradlew makeJar即可导出Jar包，导出路径为. /library/build/libs 

教你自己写Android第三方库详解手机开发

在

Teminal

中输入

gradlew 

makeJar

即可导出

Jar

包，导出路径为

. 

/library/build/libs 

看到buil success就好了

教你自己写Android第三方库详解手机开发

后记

其实这都是很简单的东西，只是个人习惯的问题，最近也开始想React  Native转了，有兴趣的可以关注我的博客和我的开源项目。

原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/5668.html

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