原因：在android中使用内容解析器时发生java.lang.SecurityException

我正在使用内容解析器阅读android消息、日历数据等。我在清单文件中添加了权限。还实现了读/写SMS和日历的运行时权限。但我还是发现了一些运行在安卓7.0或更高版本上的设备的问题

Caused by: java.lang.SecurityException: 
  at android.os.Parcel.readException (Parcel.java:1693)
  at android.os.Parcel.readException (Parcel.java:1646)
  at android.app.ActivityManagerProxy.getContentProvider (ActivityManagerNative.java:4912)
  at android.app.ActivityThread.acquireProvider (ActivityThread.java:6043)
  at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider (ContextImpl.java:2474)
  at android.content.ContentResolver.acquireUnstableProvider (ContentResolver.java:1521)
  at android.content.ContentResolver.query (ContentResolver.java:520)
  at android.content.ContentResolver.query (ContentResolver.java:478)
  at com.allbackup.ui.activity.MsgsActivity.c (MsgsActivity.java:301)
  at com.allbackup.ui.activity.MsgsActivity$c.a (MsgsActivity.java:201)
  at com.allbackup.ui.activity.MsgsActivity$c.doInBackground (MsgsActivity.java:186)

以上是阅读短信时的错误跟踪。下面是代码：

Uri message = Uri.parse("content://sms/");
            ContentResolver cr = getContentResolver();

            Cursor c = cr.query(message, null, null, null, null);
            //startManagingCursor(c);
            int totalSMS = c.getCount();

            if (c.moveToFirst()) {
if(c.getString(c.getColumnIndex("address")) != null){
                        add = c.getString(c.getColumnIndexOrThrow("address")).replaceAll("[\\s\\-()]", "");
                        map.put("address", c.getString(c.getColumnIndexOrThrow("address")).replaceAll("[\\s\\-()]", ""));
                    }else{

                        map.put("address", "");
                    }
if(!add.isEmpty()){
                        Uri lookupUri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(add));
                        Cursor cno = getContentResolver().query(lookupUri, new String[]{ContactsContract.Data.DISPLAY_NAME_PRIMARY, ContactsContract.Data.PHOTO_THUMBNAIL_URI},null,null,null);
                        if(cno.getCount()>0){
                            try {
                                cno.moveToFirst();
                                map.put("name", cno.getString(0));
                                map.put("photo", cno.getString(1));
                            } catch (Exception e) {
                                // TODO: handle exception
                            }finally{
//                              cno.close();
                            }
                        }else{
                            map.put("name", "");
                            map.put("photo", "");

                        }
                        if(cno!=null)
                            cno.close();
                    }
}

我在下面的行中遇到错误：

Cursor cno = getContentResolver().query(lookupUri, new String[]{ContactsContract.Data.DISPLAY_NAME_PRIMARY, ContactsContract.Data.PHOTO_THUMBNAIL_URI},null,null,null);

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.allbackup">

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="22" />

    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.READ_SMS" />
    <uses-permission android:name="android.permission.RECEIVE_SMS" />
    <uses-permission android:name="android.permission.READ_CALL_LOG" />
    <uses-permission android:name="android.permission.READ_CALENDAR" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
    <uses-permission android:name="android.permission.WRITE_CALL_LOG" />
    <uses-permission android:name="android.permission.WRITE_CALENDAR" />
    <uses-permission android:name="android.permission.WRITE_SMS" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".ui.activity.SplashActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/FullScreen">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>
        </activity>
</application>

</manifest>

获取运行时请求权限所需的所有危险权限。请参阅此

在使用内容提供商访问内容之前，您必须始终检查权限。如果未授予，则必须在运行时请求权限，然后尝试获取消息

if(ContextCompat.checkSelfPermission(getBaseContext(), "android.permission.READ_SMS") == PackageManager.PERMISSION_GRANTED) {

read your contacts here

}

---

有关更多信息，请参阅此网站：

您是否明确请求所有权限？在Android O之前的操作系统中，请求用于授予该组中所有权限的读/写权限。但是从androido开始，您需要显式地请求读写权限，以便同时获得permissions@Sagar我不明白你的意思。我的意思是：如果你请求权限

ActivityCompat.requestPermissions（这个，新字符串[]{Manifest.permission.READ_CALENDAR，requestCode）；

然后系统用于授予读写日历权限。但对于新版本，您需要

ActivityCompat.requestPermissions（这个新字符串[]{Manifest.permission.Read\u calendar，Manifest.permission.write\u calendar}，requestCode）

@Sagar但我在android 7.0和7.1上也遇到了此错误。您是否在每次访问提供商时检查应用程序是否具有权限，还是在应用程序启动时检查应用程序是否具有权限？以防用户在应用程序启动后撤销权限。您提到短信和日历，但您是否具有android.permission.READ\u CONTACTS权限？