Merge pull request Blankj#56 from jp1017/patch-1

see 10/09 log

Author: Blankj

utilcode/src/main/java/com/blankj/utilcode/utils/AppUtils.java

@@ -9,6 +9,8 @@
 import android.content.pm.Signature;
 import android.graphics.drawable.Drawable;
 
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
@@ -30,6 +32,36 @@ public class AppUtils {
     private AppUtils() {
         throw new UnsupportedOperationException("u can't instantiate me...");
     }
+    
+    
+   /**
+	 * 获取应用的 SHA1 值， 可据此判断高德，百度地图 key 是否正确
+	 * @param context 上下文
+	 * @return 应用的 SHA1 字符串, 比如： 53:FD:54:DC:19:0F:11:AC:B5:22:9E:F1:1A:68:88:1B:8B:E8:54:42
+     */
+	public static String getSHA1(Context context) {
+		try {
+			PackageInfo info = context.getPackageManager().getPackageInfo(
+					context.getPackageName(), PackageManager.GET_SIGNATURES);
+			byte[] cert = info.signatures[0].toByteArray();
+			MessageDigest md = MessageDigest.getInstance("SHA1");
+			byte[] publicKey = md.digest(cert);
+			StringBuilder hexString = new StringBuilder();
+			for (byte aPublicKey : publicKey) {
+				String appendString = Integer.toHexString(0xFF & aPublicKey).toUpperCase();
+				if (appendString.length() == 1)
+					hexString.append("0");
+				hexString.append(appendString);
+				hexString.append(":");
+			}
+			String result = hexString.toString();
+			return result.substring(0, result.length() - 1);
+		} catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
+			e.printStackTrace();
+		}
+		return "";
+	}
+    
 
     /**
      * 判断App是否安装
@@ -628,4 +660,4 @@ public static boolean cleanAppData(Context context, File... dirs) {
         }
         return isSuccess;
     }
-}
+}