权限拒绝:在Android Studio中从ProcessRecord打开提供程序com.android.providers.contacts.ContactsProvider2

Question

当我尝试从手机读取联系人时,我收到此错误,并且我READ_CONTACTS在Manifest文件中包含了权限.奇怪的是它在Eclipse中运行良好,但当我将项目转换为Gradle并在Android Studio中运行时,我收到此错误.

logcat说:

权限拒绝:从ProcessRecord打开提供程序com.android.providers.contacts.ContactsProvider2 {302f069 29282:com.GP/u0a322}(pid = 29282,uid = 10322)需要android.permission.READ_CONTACTS或android.permission.WRITE_CONTACTS

这是清单代码:

<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" />

Answer 1

由于Marshmallow更新在运行时请求权限,因此读取联系人权限不起作用.示例代码是

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;
    }
}

截图示例:

我从这里得到了以下源代码

Answer 2

我的问题是我使用的是Marshmallow模拟器,并对我们如何向用户请求权限进行了一些更改.因此,即使添加了权限,它仍然要求权限.http://developer.android.com/training/permissions/requesting.html

Answer 3

仅当应用程序的targetSdkVersion（清单中指定）为23或更高时，才使用新的运行时权限方案。因此，避免此问题的一种方法是使targetSdkVersion低于23。请参见此处的说明：

https://developer.android.com/guide/topics/security/permissions.html#normal-dangerous