Android-AppUtils工具类

常用APP的工具类，包含版本号、版本名称、安装的应用程序ICON

public class AppUtils {

    private AppUtils(){}

    /**
     * 设置状态栏的颜色
     * @param activity
     * @param colorResId
     */
    public static void setWindowStatusBarColor(Activity activity, int colorResId) {
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                Window window = activity.getWindow();
                window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
                window.setStatusBarColor(activity.getResources().getColor(colorResId));

                //底部导航栏
                //window.setNavigationBarColor(activity.getResources().getColor(colorResId));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 设置Dialog状态颜色
     * @param dialog
     * @param colorResId
     */
    public static void setWindowStatusBarColor(Dialog dialog, int colorResId) {
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                Window window = dialog.getWindow();
                window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
                window.setStatusBarColor(dialog.getContext().getResources().getColor(colorResId));

                //底部导航栏
                //window.setNavigationBarColor(activity.getResources().getColor(colorResId));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取包名
     * @param context
     * @return
     */
    public static String getPackageName(Context context){
        return context.getPackageName();
    }

    /**
     * 获取VersionName(版本名称)
     * @param context
     * @return
     * 失败时返回""
     */
    public static String getVersionName(Context context){
        PackageManager packageManager = getPackageManager(context);
        try {
            PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(context), 0);
            return packageInfo.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * 获取VersionCode(版本号)
     * @param context
     * @return
     * 失败时返回-1
     */
    public static int getVersionCode(Context context){
        PackageManager packageManager = getPackageManager(context);
        try {
            PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(context), 0);
            return packageInfo.versionCode;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return -1;
    }

    /**
     * 获取所有安装的应用程序,不包含系统应用
     * @param context
     * @return
     */
    public static List<PackageInfo> getInstalledPackages(Context context){
        PackageManager packageManager = getPackageManager(context);
        List<PackageInfo> packageInfos = packageManager.getInstalledPackages(0);
        List<PackageInfo> packageInfoList  = new ArrayList<>();
        for(int i=0; i < packageInfos.size();i++){
            if ((packageInfos.get(i).applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
                packageInfoList.add(packageInfos.get(i));
            }
        }
        return packageInfoList;
    }

    /**
     * 获取应用程序的icon图标
     * @param context
     * @return
     * 当包名错误时，返回null
     */
    public static Drawable getApplicationIcon(Context context){
        PackageManager packageManager = getPackageManager(context);
        try {
            PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(context), 0);
            return packageInfo.applicationInfo.loadIcon(packageManager);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 启动安装应用程序
     * @param activity
     * @param path    应用程序路径
     */
    public static void installApk(Activity activity, String path){
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(new File(path)),
                "application/vnd.android.package-archive");
        activity.startActivity(intent);
    }

    /**
     * 获取PackageManager对象
     * @param context
     * @return
     */
    private static PackageManager getPackageManager(Context context){
        return context.getPackageManager();
    }
}

原文地址：https://www.cnblogs.com/android-deli/p/9648080.html