Android PackageManager的妙用

本文主要是介绍Android PackageManager的妙用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

判断是否是系统应用

	private boolean isSystemApp(String pkgName) {if (null == pkgName || TextUtils.isEmpty(pkgName)) {return false;}try {PackageInfo info = getPackageManager().getPackageInfo(pkgName, PackageManager.GET_SIGNATURES);if ((info.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {return true;}} catch (PackageManager.NameNotFoundException e) {e.printStackTrace();}return false;}

判断是否是persist应用

	private boolean isPersistApp(String pkgName) {if (null == pkgName || TextUtils.isEmpty(pkgName)) {return false;}try {PackageInfo info = getPackageManager().getPackageInfo(pkgName, PackageManager.GET_SIGNATURES);if ((info.applicationInfo.flags &(ApplicationInfo.FLAG_SYSTEM | ApplicationInfo.FLAG_PERSISTENT)) ==(ApplicationInfo.FLAG_SYSTEM | ApplicationInfo.FLAG_PERSISTENT)) {return true;}} catch (PackageManager.NameNotFoundException e) {e.printStackTrace();}return false;}

获取签名信息

	try {PackageInfo info = getPackageManager().getPackageInfo("com.android.settings", PackageManager.GET_SIGNATURES);Signature[] signatures = info.signatures;String str = signatures[0].toString();} catch (Exception e){e.printStackTrace();}

str 输出为 ：android.content.pm.Signature@b2d95fc0

获取 MD5、 SHA1、 SHA256

获取方法是一样的，只是初始化 MessageDigest 时传的值不同，

	/*** 获取 MD5 、SHA1 、SHA256* @param algorithm : 只能是 MD5 、SHA1 、SHA256* 返回值是这种形式：22:13:F1:91:ED:BC:92:E7:44:1B:34:9E:45:90:AB:76* */private String getAppSignatureAlgorithm(String pkgName, String algorithm){if (null == pkgName || TextUtils.isEmpty(pkgName)) {return null;}try {PackageInfo info = getPackageManager().getPackageInfo(pkgName, PackageManager.GET_SIGNATURES);Signature[] signatures = info.signatures;byte[] signBytes = signatures[0].toByteArray();MessageDigest mDigest = MessageDigest.getInstance(algorithm);byte[] bytesMd5 = mDigest.digest(signBytes);StringBuilder builder = new StringBuilder();for (byte b : bytesMd5) {builder.append(String.format("%02X", b)).append(":");// byte 转 16 进制}builder.replace(builder.length()-1, builder.length(),"");// 删除最后的 ：return builder.toString();}catch (Exception e){e.printStackTrace();}return null;}

使用示例，

String PKG_SETTINGS = "com.android.settings";
String sMd5 = getAppSignatureAlgorithm(PKG_SETTINGS, "MD5");
String sSha1 = getAppSignatureAlgorithm(PKG_SETTINGS, "SHA1");
String sSha256 = getAppSignatureAlgorithm(PKG_SETTINGS, "SHA256");

结果可以参考 AndroidStudio查看apk签名信息_android studio查看apk签名版本-CSDN博客 验证

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