何时在运行时请求 Android Marshmallow 6.0 的权限？

android java android-6.0-marshmallow runtime-permissions

2022-09-04 20:05:01

我正在测试我的应用程序，即使它已经在清单中定义，它也被强制关闭。在某个地方，我读到过，如果我在运行时请求权限，那么它不会强制关闭您的应用程序。我也读过这个Android文档，这是用于请求运行时权限的。Marshmallow 6.0android.permission.READ_EXTERNAL_STORAGE

因此，我开始知道我们可以请求Android文档中提到的如下权限。

// 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，用于获取结果。onRequestPermissionsResult

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

     }
}

我的问题是在哪里确切地请求用户的权限？我们应该在应用程序开始时使用请求权限，还是应该在需要权限时使用它？

答案 1

这对我有用!!!在应用程序的启动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）声明一个字符串数组，其中包含您需要的权限数量，

 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

            }
        }

    }

答案 2

喜欢这个

private static final int  REQUEST_ACCESS_FINE_LOCATION = 111;

在您的 onCreate 中

boolean hasPermissionLocation = (ContextCompat.checkSelfPermission(getApplicationContext(),
            Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED);
    if (!hasPermissionLocation) {
        ActivityCompat.requestPermissions(ThisActivity.this,
                new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                REQUEST_ACCESS_FINE_LOCATION);
    }

然后检查结果

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

        case REQUEST_ACCESS_FINE_LOCATION: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
            {
                Toast.makeText(ThisActivity.this, "Permission granted.", Toast.LENGTH_SHORT).show();

                //reload my activity with permission granted
                finish();
                startActivity(getIntent());

            } else
            {
                Toast.makeText(ThisActivity.this, "The app was not allowed to get your location. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
            }
        }

    }

}