Question

我是关于android的新手。我想制作一个功能，检查我的电话簿中是否已有电话号码。我在清单上添加了阅读联系人权限：

<uses-permission android:name="android.permission.READ_CONTACTS" />

我无法每次都获得阅读联系人和我的应用程序崩溃的权限。

Answer 1

基本上，在从危险权限列表中执行操作之前，您必须先检查您是否拥有权限

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

如果它返回您的应用程序未被授予，那么您需要在运行时请求它。

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

所以，将代码放在第一个＆＃34之后;如果＆＃34; ＆＃34; else＆＃34;块。

如果您还有其他问题，请与我们联系。

Answer 2

您可以在Android Marshmallow here中了解有关新权限模型的所有信息。

摘要

在尝试执行任何操作之前，您必须检查dangerous permissions是否有权限。

使用以下代码检查并询问权限：

// 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.
    }
}

并查看用户是否已接受或拒绝了权限请求：

@Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

Android没有权限从电话簿中读取

2 个答案:

摘要