Android Marshmallow 6.0在运行时请求权限

Question

我正在测试我的应用程序Marshmallow 6.0,它正在关闭android.permission.READ_EXTERNAL_STORAGE,即使已经在Manifest中定义了它.在某处我读过,如果我在运行时请求权限,那么它就不会强行关闭你的应用程序.我也读过这个android文档,用于请求运行时权限.

所以,我开始知道我们可以请求android文档中提到的下面的权限.

// Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(thisActivity,
                Manifest.permission.READ_CONTACTS)
        != PackageManager.PERMISSION_GRANTED) {

    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
            Manifest.permission.READ_CONTACTS)) {

        // Show an expanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.

    } else {

        // No explanation needed, we can request the permission.

        ActivityCompat.requestPermissions(thisActivity,
                new String[]{Manifest.permission.READ_CONTACTS},
                MY_PERMISSIONS_REQUEST_READ_CONTACTS);

        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
}

上面的代码有一个回调方法onRequestPermissionsResult,可以得到结果.

@Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {

     }
}

我的问题是在哪里准确地向用户请求权限？我们应该在应用程序启动时使用请求权限,还是应该在需要权限时使用？

Answer 1

这对我有用!!! 在您的应用程序的Splash活动中执行以下操作,

1)为请求代码声明一个int变量,

private static final int REQUEST_CODE_PERMISSION = 2;

2)使用您需要的权限数声明一个字符串数组,

 String[] mPermission = {Manifest.permission.READ_CONTACTS, Manifest.permission.READ_SMS,
 Manifest.permission.ACCESS_FINE_LOCATION,
 Manifest.permission.WRITE_EXTERNAL_STORAGE};

3)下一步检查onCreate方法的运行时权限条件,

try {
            if (ActivityCompat.checkSelfPermission(this, mPermission[0])
                    != MockPackageManager.PERMISSION_GRANTED ||
                    ActivityCompat.checkSelfPermission(this, mPermission[1])
                            != MockPackageManager.PERMISSION_GRANTED ||
                    ActivityCompat.checkSelfPermission(this, mPermission[2])
                            != MockPackageManager.PERMISSION_GRANTED ||
                    ActivityCompat.checkSelfPermission(this, mPermission[3])
                            != MockPackageManager.PERMISSION_GRANTED) {

                ActivityCompat.requestPermissions(this,
                        mPermission, REQUEST_CODE_PERMISSION);

              // If any permission aboe not allowed by user, this condition will execute every tim, else your else part will work
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

4)现在声明onRequestPermissionsResult方法来检查请求代码,

@Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        Log.e("Req Code", "" + requestCode);
        if (requestCode == REQUEST_CODE_PERMISSION) {
            if (grantResults.length == 4 &&
                    grantResults[0] == MockPackageManager.PERMISSION_GRANTED &&
                    grantResults[1] == MockPackageManager.PERMISSION_GRANTED &&
                    grantResults[2] == MockPackageManager.PERMISSION_GRANTED &&
                    grantResults[3] == MockPackageManager.PERMISSION_GRANTED) {

               // Success Stuff here

            }
        }

    }

Answer 2

一般来说，在需要时立即请求所需的权限。通过这种方式，您可以告知用户为什么需要该权限并更轻松地处理权限拒绝。

考虑用户在应用程序运行时撤销权限的场景：如果您在启动时请求它并且以后不再检查它，这可能会导致意外的行为或异常。