获取应用程序的签名

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        try {
            // 得到签名
            PackageManager pm = getPackageManager();
            PackageInfo packageInfo = pm.getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
            Signature[] signatures = packageInfo.signatures;
            StringBuilder sb = new StringBuilder();
            for (Signature signature : signatures) {
                sb.append(signature.toCharsString());
            }
            Log.i("i", sb.toString());
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

}