以下是我面临的错误：
/com.DownToLunch E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.DownToLunch, PID: 14615
java.lang.RuntimeException: Unable to instantiate service com.DownToLunch.Networking.RecieveSMS$MessageService: java.lang.InstantiationException: can't instantiate class com.DownToLunch.Networking.RecieveSMS$MessageService; no empty constructor
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2688)
at android.app.ActivityThread.access$1800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5433)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.InstantiationException: can't instantiate class com.DownToLunch.Networking.RecieveSMS$MessageService; no empty constructor
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2685)
at android.app.ActivityThread.access$1800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5433)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
这是我的清单文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.DownToLunch">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
<uses-permission android:name="android.permission.READ_SMS" />
<application
android:name=".app.AppController"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/Theme.NoTitle">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Otp"
android:theme="@style/Theme.NoTitle" />
<activity android:name=".DetectOtp"></activity>
<receiver android:name="com.DownToLunch.Networking.RecieveSMS">
<intent-filter>
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>
<service
android:enabled="true"
android:name=".Networking.RecieveSMS$MessageService">
</service>
</application>
</manifest>
这是课程，我已经定义了我的服务：
public class RecieveSMS extends BroadcastReceiver {
Context mcontext;
String phoneNumber;
String message;
@Override
public void onReceive(Context context, Intent intent) {
final Bundle bundle = intent.getExtras();
mcontext=context;
String senderNum;
try {
if (bundle != null) {
final Object[] pdusObj = (Object[]) bundle.get("pdus");
for (int i = 0; i < pdusObj.length; i++) {
SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
phoneNumber = currentMessage.getDisplayOriginatingAddress();
senderNum = phoneNumber;
String message = currentMessage.getDisplayMessageBody();
Log.d("Message Body",message);
//send();
Log.i("SmsReceiver", "senderNum: " + senderNum + "; message: " + message);
Intent ie=new Intent(mcontext, MessageService.class);
mcontext.startService(ie);
} // end for loop
} // bundle is null
} catch (Exception e) {
Log.e("SmsReceiver", "Exception smsReceiver" + e);
}
}
public class MessageService extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
send();
return super.onStartCommand(intent, flags, startId);
}
// Send an Intent with an action named "custom-event-name". The Intent
// sent should
// be received by the ReceiverActivity.
public void send() {
//Log.d(TAG, "MainActivity.send()");
Intent sendableIntent = new Intent("otp");
sendableIntent.putExtra("message",message);
LocalBroadcastManager.getInstance(mcontext).
sendBroadcast(sendableIntent);
}
}
}
我在这里收到了otp并试图在吐司中展示它：
public class DetectOtp extends AppCompatActivity {
String message;
private IntentFilter receiveFilter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detect_otp);
receiveFilter = new IntentFilter("otp");
LocalBroadcastManager.getInstance(this).
registerReceiver(handler, receiveFilter);
}
private BroadcastReceiver handler = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// Bundle b =intent.getExtras();
// b = getIntent().getExtras();
message = intent.getStringExtra("message");
Log.d("Message",message);
Toast.makeText(DetectOtp.this,
message, Toast.LENGTH_LONG).show();
}
};
}
我在哪里弄错了？在启动服务以使用LocalBroadcastManager发送值时，它显示此错误：
com.DownToLunch.Networking.RecieveSMS $ MessageService：
java.lang.InstantiationException：无法实例化类
com.DownToLunch.Networking.RecieveSMS $ MessageService;没空？
答案 0 :(得分：1)
替换：
public class MessageService extends Service
使用：
static public class MessageService extends Service
你不能让Service成为一个内在的阶级，就像你现在拥有它一样。