Android入门开发：Broadcast SMS Receiver收信后RecyclerView无显示问题求助

1. 清单文件配置错误 #

• SmsReceiver未配置短信接收的intent-filter，无法捕获系统短信广播，修改标签如下：

<receiver
    android:name=".SmsReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter android:priority="1000">
        <action android:name="android.provider.Telephony.SMS_RECEIVED" />
    </intent-filter>
</receiver>

2. 权限申请逻辑缺失 #

• RECEIVE_SMS属于危险权限，需要和READ_SMS一起动态申请，同时要重写权限申请回调，用户授权后加载短信列表。修改MainActivity权限申请逻辑，新增onRequestPermissionsResult方法：

// 先将adapter提为全局变量，方便后续更新
private ArrayAdapter adapter;

// onCreate里初始化adapter时赋值全局
adapter= new ArrayAdapter();

// onCreate里的权限申请修改为
if(ContextCompat.checkSelfPermission(getBaseContext(), Manifest.permission.READ_SMS) == PackageManager.PERMISSION_GRANTED
&& ContextCompat.checkSelfPermission(getBaseContext(), Manifest.permission.RECEIVE_SMS) == PackageManager.PERMISSION_GRANTED) {
    refreshSmsInbox();
}else {
    final int REQUEST_CODE_ASK_PERMISSIONS = 123;
    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_SMS, Manifest.permission.RECEIVE_SMS}, REQUEST_CODE_ASK_PERMISSIONS);
}

// 新增权限申请回调
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(requestCode == 123){
        boolean allGranted = true;
        for(int result : grantResults){
            if(result != PackageManager.PERMISSION_GRANTED){
                allGranted = false;
                break;
            }
        }
        if(allGranted){
            refreshSmsInbox();
        }
    }
}

3. refreshSmsInbox方法逻辑错误 #

• 存在Cursor强转SmsModel的崩溃问题，同时未取全字段、未通知适配器更新、未关闭Cursor，修改如下：

public void refreshSmsInbox() {
    ContentResolver contentResolver = getContentResolver();
    Cursor smsInboxCursor = contentResolver.query(Uri.parse("content://sms/inbox"), null, null, null, null);
    if(smsInboxCursor == null) return;
    int indexBody = smsInboxCursor.getColumnIndex("body");
    int indexAddress = smsInboxCursor.getColumnIndex("address");
    int indexId = smsInboxCursor.getColumnIndex("_id");
    int indexTime = smsInboxCursor.getColumnIndex("date");
    if (indexBody < 0 || indexAddress <0 || indexId <0 || indexTime <0 || !smsInboxCursor.moveToFirst()) {
        smsInboxCursor.close();
        return;
    }
    smsModel.clear();
    do {
        String id = smsInboxCursor.getString(indexId);
        String address = smsInboxCursor.getString(indexAddress);
        String body = smsInboxCursor.getString(indexBody);
        // 时间戳转格式化时间
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm", Locale.getDefault());
        String time = sdf.format(new Date(smsInboxCursor.getLong(indexTime)));
        smsModel.add(new SmsModel(id, address, body, time, address));
    } while (smsInboxCursor.moveToNext());
    smsInboxCursor.close();
    // 通知适配器更新
    adapter.setSmsModel(smsModel);
}

4. SmsModel构造函数错误 #

• 构造函数中Number字段写死，修改如下：

public SmsModel(String id, String contactNumber, String contactSms, String time, String number) {
    Id = id;
    ContactNumber = contactNumber;
    ContactSms = contactSms;
    Time = time;
    // 不要写死，使用传入的参数
    Number = number;
}

5. 新短信更新逻辑为空 #

• 实现updateList方法，收到新短信后添加到列表顶部并更新：

public void updateList(final String smsMessage) {
    runOnUiThread(() -> {
        String[] split = smsMessage.split("\n", 3);
        if(split.length >=3){
            String address = split[0].replace("SMS From: ", "");
            String body = split[1];
            String time = new SimpleDateFormat("HH:mm", Locale.getDefault()).format(new Date());
            smsModel.add(0, new SmsModel(System.currentTimeMillis()+"", address, body, time, address));
            adapter.setSmsModel(smsModel);
            recyclerView.scrollToPosition(0);
        }
    });
}

6. 列表项布局高度错误 #

• smsview.xml根布局高度设置为match_parent会导致每一项占满全屏，修改为wrap_content：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp">

7. SmsReceiver兼容高版本系统 #

• Android 6.0以上创建SmsMessage需要传入format参数，修改onReceive方法：

@Override
public void onReceive(Context context, Intent intent) {
    Bundle intentExtras = intent.getExtras();
    if (intentExtras != null) {
        Object[] sms = (Object[]) intentExtras.get(SMS_BUNDLE);
        String format = intentExtras.getString("format");
        String smsMessageStr = "";
        String address = "";
        String body = "";
        for (int i = 0; i < sms.length; ++i) {
            SmsMessage smsMessage;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                smsMessage = SmsMessage.createFromPdu((byte[]) sms[i], format);
            } else {
                smsMessage = SmsMessage.createFromPdu((byte[]) sms[i]);
            }
            body += smsMessage.getMessageBody().toString();
            address = smsMessage.getOriginatingAddress();
        }
        smsMessageStr += "SMS From: " + address + "\n";
        smsMessageStr += body + "\n";
        Toast.makeText(context, smsMessageStr, Toast.LENGTH_SHORT).show();
        if(MainActivity.instance() != null){
            MainActivity.instance().updateList(smsMessageStr);
        }
    }
}

注：上述代码需要自行导入缺失的包（SimpleDateFormat、Date、Manifest等），运行前请先在系统设置中确认app已获得短信权限。

内容的提问来源于stack exchange，提问作者user16634163