android 开发 获取apk 信息和sha1值的项目

获取sha1值的代码如下

public class MainActivity extends AppCompatActivity {    private TextView main_info_tv;    private Context context;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initValues();    }    private void initView() {        // TODO Auto-generated method stub        main_info_tv = (TextView) findViewById(R.id.main_info_tv);    }    private void initValues() {        // TODO Auto-generated method stub        main_info_tv.setText(getAppInfos());    }    private String getAppInfos() {        String result = "本demo用途：主要用于查看手机中应用程序的包名、sha1值、入口Activity和版本信息。^_^\n\n";        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);        List<ResolveInfo> mApps = getPackageManager().queryIntentActivities(mainIntent, 0);        for (int i = 0; i < mApps.size(); i++) {            try {                ResolveInfo info = mApps.get(i);                String appName = info.loadLabel(getPackageManager()).toString();                String packagename = info.activityInfo.packageName;                String appname = info.activityInfo.name;                PackageInfo packageInfo = getPackageManager().getPackageInfo(packagename, 0);                int appVersionCode = packageInfo.versionCode;                String appVersionName = packageInfo.versionName;                try {                    context = createPackageContext(packagename, CONTEXT_INCLUDE_CODE | CONTEXT_IGNORE_SECURITY);                } catch (PackageManager.NameNotFoundException e) {                    e.printStackTrace();                }                String sha1 = getSha1.getCertificateSHA1Fingerprint(context);                result += "NO. " + i + " " + appName + " apk：\n" + "程序包名(PackageName): " + packagename + "\nsha1值: " + sha1 + "\n对应入口Activity: " + appname + "\n版本号: " + appVersionCode + "\n版本名称: " + appVersionName + "\n\n";            } catch (PackageManager.NameNotFoundException e) {                // TODO Auto-generated catch block                // can't reach                e.printStackTrace();            }        }        return result;    }

public class getSha1 {    public static String getCertificateSHA1Fingerprint(Context context) {        //获取包管理器        PackageManager pm = context.getPackageManager();        //获取当前要获取SHA1值的包名，也可以用其他的包名，但需要注意，        //在用其他包名的前提是，此方法传递的参数Context应该是对应包的上下文。        String packageName = context.getPackageName();        //返回包括在包中的签名信息        int flags = PackageManager.GET_SIGNATURES;        PackageInfo packageInfo = null;        try {            //获得包的所有内容信息类            packageInfo = pm.getPackageInfo(packageName, flags);        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        //签名信息        Signature[] signatures = packageInfo.signatures;        byte[] cert = signatures[0].toByteArray();        //将签名转换为字节数组流        InputStream input = new ByteArrayInputStream(cert);        //证书工厂类，这个类实现了出厂合格证算法的功能        CertificateFactory cf = null;        try {            cf = CertificateFactory.getInstance("X509");        } catch (CertificateException e) {            e.printStackTrace();        }        //X509证书，X.509是一种非常通用的证书格式        X509Certificate c = null;        try {            c = (X509Certificate) cf.generateCertificate(input);        } catch (CertificateException e) {            e.printStackTrace();        }        String hexString = null;        try {            //加密算法的类，这里的参数可以使MD4,MD5等加密算法            MessageDigest md = MessageDigest.getInstance("SHA1");            //获得公钥            byte[] publicKey = md.digest(c.getEncoded());            //字节到十六进制的格式转换            hexString = byte2HexFormatted(publicKey);        } catch (NoSuchAlgorithmException e1) {            e1.printStackTrace();        } catch (CertificateEncodingException e) {            e.printStackTrace();        }        return hexString;    }    //这里是将获取到得编码进行16进制转换    private static String byte2HexFormatted(byte[] arr) {        StringBuilder str = new StringBuilder(arr.length * 2);        for (int i = 0; i < arr.length; i++) {            String h = Integer.toHexString(arr[i]);            int l = h.length();            if (l == 1)                h = "0" + h;            if (l > 2)                h = h.substring(l - 2, l);            str.append(h.toUpperCase());            if (i < (arr.length - 1))                str.append(':');        }        return str.toString();    }}

布局文件：

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/main_info_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" /></ScrollView>