Question

我正在尝试首次使用我的应用程序向用户提出运行时权限。这是代码：

if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
        if ((ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) &&
                (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)) {
            new masterdb(getApplicationContext());
            new checkRegistration().execute();
        } else {

        }
    } else {
        //initialize database
    }

但我的应用程序因应用程序无响应而崩溃。 logcat显示如下：

无法找到方法android.app.Activity.checkSelfPermission，从方法myPackageName.Lib.hasPermission引用 09-16 11：46：54.969 3763-3763 / myPackageName W / dalvikvm：VFY：无法解析虚方法170：Landroid / app / Activity; .checkSelfPermission（Ljava / lang / String;）I

这里的事情是，这个代码甚至不应该在android Kitkat中运行（检查权限）。但我仍然得到这个日志。当我将代码移出sdk版本的if块时检查它运行正常。

Answer 1

请尝试使用此代码

       String currentPeriod = String.format("{call %s.testProc(?)}", params.getJsonObject("databaseInfo").getString("dbName"));
      String priorPeriod   = String.format("{call %s.testProc(?)}", params.getJsonObject("databaseInfo").getString("dbName"));
      String todayPeriod   = String.format("{call %s.testProc(?)}", params.getJsonObject("databaseInfo").getString("dbName"));
     JsonArray jsonArray = new JsonArray();


    database.dbObject().getConnectionObservable().subscribe(
            connection -> {
                resultSetObservable = Observable.combineLatest(firstCall, secCall, thirdCall)
     firstCall = connection.callWithParamsObservable(currentPeriod, new JsonArray().add(params.getString("testParams")),jsonArray )

      secCall = result -> connection.callWithParamsObservable(priorPeriod, new JsonArray().add(params.getString("testParams")), jsonArray )

     thirdCall = result -> connection.callWithParamsObservable(todayPeriod, new JsonArray().add(params.getString("testParams")),jsonArray )
                resultSetObservable.subscribe(firstRes, secRes, thirdRes -> {
                    handler.handle(ReportUtils.parseSQLResult(resultSet.getRows()));
                },error -> {
                    error.printStackTrace();
                },connection::close);

            },err -> {
                err.printStackTrace();
            }
    );

Answer 2

使用此功能检查是否授予权限。如果不是许可请求

private boolean checkPermission(){
        int result = ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION);
        if (result == PackageManager.PERMISSION_GRANTED){

            return true;

        } else {

            return false;

        }
    }

    private void requestPermission(){

        if (ActivityCompat.shouldShowRequestPermissionRationale(activity,Manifest.permission.ACCESS_FINE_LOCATION)){

            Toast.makeText(context,"GPS permission allows us to access location data. Please allow in App Settings for additional functionality.",Toast.LENGTH_LONG).show();

        } else {

            ActivityCompat.requestPermissions(activity,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},PERMISSION_REQUEST_CODE);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_CODE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    Snackbar.make(view,"Permission Granted, Now you can access location data.",Snackbar.LENGTH_LONG).show();

                } else {

                    Snackbar.make(view,"Permission Denied, You cannot access location data.",Snackbar.LENGTH_LONG).show();

                }
                break;
        }
    }

找不到方法android.app.Activity.checkSelfPermission

2 个答案: