本文整理自网络，侵删。
function GetSignatures():string;
var
PackageName:string;
PM:JPackageManager;
PI:JPackageInfo;
Signatures:String;
SignCount:Integer;
Signs:TJavaObjectArray<JSignature>;
Sign:JSignature;
JObj:JNIObject;
Signstr:Jstring;
I: Integer;
tests:TJavaObjectArray<JString>;
begin
PackageName := 'com.test.testapp;
PM := SharedActivity.getPackageManager;
PI := PM.getPackageInfo(StringToJString(PackageName),TJPackageManager.JavaClass.GET_SIGNATURES);
Signs := PI.signatures;
Sign := TJSignature.Wrap(Signs.GetRawItem(0));//这个地方一定要Warp转换一次 ,直接用Signs[0]取不到
Signstr := Sign.toCharsString;
Signatures := JStringToString(Signstr);
Result := Signatures;
end;
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