检索三星Galaxy S9上的所有者信息

Question

我正在尝试以编程方式在Android应用程序中获取用户的配置文件信息。这在Pixel手机上运行良好，但在三星手机上不会返回任何结果。例如：

String contactId = null;

// getting contacts ID
Cursor cursorID = getContentResolver().query(ContactsContract.Profile.CONTENT_URI,
            new String[]{ContactsContract.Contacts._ID},
            null, null, null);

if (cursorID.moveToFirst()) {
    contactId = cursorID.getString(cursorID.getColumnIndex(ContactsContract.Contacts._ID));
}

在Pixel上，这将返回电话所有者的联系id。在Galaxy上，光标是空的。我猜想这是因为三星使用了一些专有版本的联系人，而这些联系人并没有通过标准的Android API暴露出来。有人能证实吗？有没有三星设备的替代品？

Answer 1

是的，在以下情况下，您肯定会得到空值：

1. 您尚未在联系人会话中创建用户配置文件。
2. 如果您尚未将邮件帐户与配置文件链接在一起。

您最终可能会使用SecurityException，为了避免这种情况，我已经根据documentaion修改了代码

你肯定会收到一条警告，说cursor finalized without prior close()，如果你不打算使用更多的游标，最好关闭游标。

不要忘记在清单子节中包含权限。

清单文件：

      <?xml version="1.0" encoding="utf-8"?>
    <manifest 


     xmlns:android="http://schemas.android.com
      /apk/res/android"
     package="com.example.ganesh.contacts">
     <uses-permission 

    android:name="android.permission.READ_CONTACTS" 
   />


       <application
        android:allowBackup="true"
       android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"

       android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
       <activity android:name=".MainActivity">
        <intent-filter>
            <action 
         android:name="android.intent.action.MAIN" />

            <category 

      android:name="android.intent.category.LAUNCHER" 
            />
        </intent-filter>
                  </activity>
               </application>

             </manifest>

活动代码：

public class MainActivity extends 
     AppCompatActivity implements 
      View.OnClickListener {
        String contactId = null;
        Button button;
        TextView textView;
         @Override
         protected void onCreate(Bundle 
             savedInstanceState) {
         super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
         button=findViewById(R.id.button);
         textView=findViewById(R.id.textView);
        button.setOnClickListener(this);

         }

@Override
public void onClick(View v) {
    onReadContacts();
}

private void onReadContacts() {
    // Here, thisActivity is the current activity
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.READ_CONTACTS)
            != PackageManager.PERMISSION_GRANTED) {

        // Permission is not granted
        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.READ_CONTACTS)) {
            // Show an explanation 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; request the permission
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.READ_CONTACTS},
                    101);

            // 101 is an
            // app-defined int constant. The callback method gets the
            // result of the request.
        }
    } else {
        // Permission has already been granted
        Cursor c = getApplication().getContentResolver().query(ContactsContract.Profile.CONTENT_URI, null, null, null, null);
        c.moveToFirst();
        textView.setText(c.getString(c.getColumnIndex("display_name")));
        Cursor cursorID = getContentResolver().query(ContactsContract.Profile.CONTENT_URI,
                new String[]{ContactsContract.Contacts._ID},
                null, null, null);

        if (cursorID.moveToFirst()) {
            contactId = cursorID.getString(cursorID.getColumnIndex(ContactsContract.Contacts._ID));
            Toast.makeText(this,contactId,Toast.LENGTH_LONG).show();
        }

        c.close();
        cursorID.close();


    }
}
@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 101
                : {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Cursor c = getApplication().getContentResolver().query(ContactsContract.Profile.CONTENT_URI, null, null, null, null);
                c.moveToFirst();
                textView.setText(c.getString(c.getColumnIndex("display_name")));
                Cursor cursorID = getContentResolver().query(ContactsContract.Profile.CONTENT_URI,
                        new String[]{ContactsContract.Contacts._ID},
                        null, null, null);

                if (cursorID.moveToFirst()) {
                    contactId = cursorID.getString(cursorID.getColumnIndex(ContactsContract.Contacts._ID));
                    Toast.makeText(this,contactId,Toast.LENGTH_LONG).show();
                }

                c.close();
                cursorID.close();

                // 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.
    }
}


}

如果你在我的代码缩进中发现困难，请通过这个google drive link。