权限拒绝：从Android Studio中的ProcessRecord打开com.android.providers.contacts.ContactsProvider2提供程序。

Question

当我尝试从手机读取联系人时，出现了这个错误，但我已经在清单文件中包含了READ_CONTACTS权限。奇怪的是，在中运行良好，但当我将项目转换为并在中运行时，就会出现此错误。logcat显示：

Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{302f069 29282:com.GP/u0a322} (pid=29282, uid=10322) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS

以下是清单代码：

<uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="19" />

    <!-- Read Contacts from phone -->
    <uses-permission android:name="android.permission.read_contacts" />
    <uses-permission android:name="android.permission.read_phone_state" />
    <uses-permission android:name="android.permission.GET_TASKS" />
    <uses-permission android:name="android.permission.READ_CALL_LOG" />

- Navakanth

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有人在API 29（Android 10）上遇到这个问题吗？我遇到了同样的异常，但是应用程序->我的应用程序->权限->联系人是允许的。更新：我拒绝了权限，然后重新添加了它。现在它可以工作了。Android操作系统的缺陷？还有其他人遇到同样的问题吗？ - Elletlar

Answer 1

由于Marshmallow更新，请求运行时权限时读取联系人权限无法正常工作。示例代码如下：

import android.Manifest;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Build;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    // The ListView
    private ListView lstNames;

    // Request code for READ_CONTACTS. It can be any number > 0.
    private static final int PERMISSIONS_REQUEST_READ_CONTACTS = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Find the list view
        this.lstNames = (ListView) findViewById(R.id.lstNames);

        // Read and show the contacts
        showContacts();
    }

    /**
     * Show the contacts in the ListView.
     */
    private void showContacts() {
        // Check the SDK version and whether the permission is already granted or not.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS);
            //After this point you wait for callback in onRequestPermissionsResult(int, String[], int[]) overriden method
        } else {
            // Android version is lesser than 6.0 or the permission is already granted.
            List<String> contacts = getContactNames();
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
            lstNames.setAdapter(adapter);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                           int[] grantResults) {
        if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission is granted
                showContacts();
            } else {
                Toast.makeText(this, "Until you grant the permission, we canot display the names", Toast.LENGTH_SHORT).show();
            }
        }
    }

    /**
     * Read the name of all the contacts.
     *
     * @return a list of names.
     */
    private List<String> getContactNames() {
        List<String> contacts = new ArrayList<>();
        // Get the ContentResolver
        ContentResolver cr = getContentResolver();
        // Get the Cursor of all the contacts
        Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);

        // Move the cursor to first. Also check whether the cursor is empty or not.
        if (cursor.moveToFirst()) {
            // Iterate through the cursor
            do {
                // Get the contacts name
                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                contacts.add(name);
            } while (cursor.moveToNext());
        }
        // Close the curosor
        cursor.close();

        return contacts;
    }
}

示例截图：

我从这里获取了以下源代码。

- krishnan

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我尝试了这个，但我的异常仍然相同。它在4.4.2设备上可以工作，我得到了联系人列表，但当我在6.0上运行应用程序时，它会崩溃并出现相同的异常。@krishnan - Sid

Answer 2

我的问题是我在使用一个Marshmallow模拟器，这使得我们从用户请求权限的方式发生了一些变化。因此，即使已经添加了权限，它仍然会不断地请求权限。http://developer.android.com/training/permissions/requesting.html

- strider

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我遇到了同样的问题，我已经指定了<uses-permission>，但它仍然在询问。 - Kanwal Prakash Singh

Answer 3

如果应用程序的目标SDK版本（在清单中指定）为23或更高，则仅使用新的运行时权限方案。因此，避免该问题的一种方法是将目标SDK版本降低到23以下。请参见此处的说明：https://developer.android.com/guide/topics/security/permissions.html#normal-dangerous。

- dazed

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这个答案已经不再适用了，因为Google Play要求目标SDK版本的最小值为26。 - Pierrick Martellière

Answer 4

import android.Manifest;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Build;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    // The ListView
    private ListView lstNames;

    // Request code for READ_CONTACTS. It can be any number > 0.
    private static final int PERMISSIONS_REQUEST_READ_CONTACTS = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Find the list view
        this.lstNames = (ListView) findViewById(R.id.lstNames);

        // Read and show the contacts
        showContacts();
    }

    /**
     * Show the contacts in the ListView.
     */
    private void showContacts() {
        // Check the SDK version and whether the permission is already granted or not.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS);
            //After this point you wait for callback in onRequestPermissionsResult(int, String[], int[]) overriden method
        } else {
            // Android version is lesser than 6.0 or the permission is already granted.
            List<String> contacts = getContactNames();
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
            lstNames.setAdapter(adapter);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                           int[] grantResults) {
        if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission is granted
                showContacts();
            } else {
                Toast.makeText(this, "Until you grant the permission, we canot display the names", Toast.LENGTH_SHORT).show();
            }
        }
    }

    /**
     * Read the name of all the contacts.
     *
     * @return a list of names.
     */
    private List<String> getContactNames() {
        List<String> contacts = new ArrayList<>();
        // Get the ContentResolver
        ContentResolver cr = getContentResolver();
        // Get the Cursor of all the contacts
        Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);

        // Move the cursor to first. Also check whether the cursor is empty or not.
        if (cursor.moveToFirst()) {
            // Iterate through the cursor
            do {
                // Get the contacts name
                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                contacts.add(name);
            } while (cursor.moveToNext());
        }
        // Close the curosor
        cursor.close();

        return contacts;
    }
}

- Mehboob Codes

Answer 5

Google Play 限制使用高风险或敏感权限，包括 SMS 或通话记录权限组。总之，即使你在运行时请求权限，你的应用仍有很大可能不被允许在 Google Play 中。

但是你可以申请一个例外。Google Play 将会逐案审查请求，并授予相关例外。允许例外的标准在 这里 提到。

- Dieter27

Answer 6

根据谷歌有关请求权限的文档，以下是在处理时需要记住的事项。

例如，假设您在应用程序清单中列出了READ_CONTACTS和WRITE_CONTACTS。如果您请求READ_CONTACTS并且用户授予了该权限，然后您请求WRITE_CONTACTS，则系统会立即授予您该权限，而无需与用户交互。

https://developer.android.com/training/permissions/requesting

- Morgan Koh

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他正在询问完全不同的事情。 - ashutosh singh