与接收 parse.com 推送通知 Android 相关的错误

Question

我一直在尝试在我的 iOS 和 android 应用上实现 parse.com 推送通知。我已经成功地在 iOS 上实现了这一点，但是，我仍然在为 Android 实现而苦苦挣扎。当用户收到通知并且用户按下通知时，我想打开我的“HomeScreen”活动，并在警报对话中显示通知中的文本。 Receiver 处理程序和清单文件以及 LogCat 如下所示。我做错了什么，我该如何解决？

主屏幕 Java：

public class Receiver extends ParsePushBroadcastReceiver {

    public Receiver(){

    }
    private static final String TAG = "MyNotificationsReceiver";

    @Override
    public void onPushOpen(Context context, Intent intent) {
        Log.e("Push", "Clicked");
        Intent i = new Intent(context, HomeScreen.class);
        i.putExtras(intent.getExtras());
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
            try {
                JSONObject json = new JSONObject(intent.getExtras().getString("com.parse.Data"));

                String notificationText = json.getString("alert");
                AlertDialog Alert= new AlertDialog.Builder(context)
                        .setTitle("News")
                        .setMessage(notificationText)
                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){
                            public void onClick(DialogInterface dialog, int which){
                            }
                        })
                        .show();

            } catch (JSONException e) {
                Log.d(TAG, "JSONException: " + e.getMessage());

        }
    }

}

清单：

<service android:name="com.parse.PushService" />
        <receiver android:name="com.parse.ParseBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.intent.action.USER_PRESENT" />
            </intent-filter>
        </receiver>
        <receiver android:name="com.parse.GcmBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND">
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

                <!--
                  IMPORTANT: Change "com.parse.tutorials.pushnotifications" to match your app's package name.
                -->
                <category android:name="au.gov.nsw.shellharbour.saferroadsshellharbour" />
            </intent-filter>
        </receiver>
        <receiver android:name="au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver" android:exported="false">
            <intent-filter>
                <action android:name="com.parse.push.intent.RECEIVE" />
                <action android:name="com.parse.push.intent.DELETE" />
                <action android:name="com.parse.push.intent.OPEN" />
            </intent-filter>
        </receiver>

Logcat：

java.lang.RuntimeException: Unable to instantiate receiver au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver: java.lang.InstantiationException: can't instantiate class au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver; no empty constructor
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2265)
            at android.app.ActivityThread.access$1600(ActivityThread.java:143)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4963)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.InstantiationException: can't instantiate class au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver; no empty constructor
            at java.lang.Class.newInstanceImpl(Native Method)
            at java.lang.Class.newInstance(Class.java:1319)
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2260)
            at android.app.ActivityThread.access$1600(ActivityThread.java:143)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4963)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

编辑：由于 Receiver 是一个内部类，它不能存在于其外部类的实例之外。这就是为什么您不能通过清单定义来实例化它的原因。要解决，请将Receiver标记为static，或者将其定义为自己的类文件。 （您可能可以删除我之前建议的空构造函数）。

---

java.lang.InstantiationException: 无法实例化类 au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver； 没有空的构造函数 在 android.app.ActivityThread.handleReceiver(ActivityThread.java:2265)

您需要一个构造函数，以便实例化接收器：

public Receiver(){

}