Question

我使用以下代码来获取读写权限，但问题是，通过在oncreate中使用这段代码，我的应用程序启动两次而不是一次。我该如何解决这个问题？

// **check if app has permission 1**//
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (!Settings.System.canWrite(this)) {
            requestPermissions(new String[] {
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.READ_EXTERNAL_STORAGE }, 2909);
        } else {
            // continue with your code
        }
    } else {
        // continue with your code
    }

这里是oncreate之外的其余代码 -

// **check if app has permission 2**//
@Override
public void onRequestPermissionsResult(int requestCode,
        String[] permissions, int[] grantResults) {
    switch (requestCode) {
    case 2909: {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Log.e("Permission", "Granted");
        } else {
            Log.e("Permission", "Denied");
        }
        return;
    }
    }
}

Answer 1

您是否尝试过使用它来检查权限

int permissionCheck = ContextCompat.checkSelfPermission(thisActivity,
        Manifest.permission.WRITE_EXTERNAL_STORAGE);

如果授予或撤销许可，则返回此井......

参考本教程Requesting Permissions at Run Time

Answer 2

对于此特定示例，您首先可以检查是否授予了权限

checkSelfPermission( Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    == PackageManager.PERMISSION_GRANTED)

如果结果为false则请求权限

修改

更改if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 到

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && (checkSelfPermission( Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    != PackageManager.PERMISSION_GRANTED) || checkSelfPermission( Manifest.permission.READ_EXTERNAL_STORAGE )
                    != PackageManager.PERMISSION_GRANTED)))

应用程序在oncreate中启动两次

2 个答案: