android - 当应用程序在后台时从通知中打开 fragment

Question

我正在使用 parse 将 Json 通知推送到带有自定义接收器的应用程序，因为我想导航到应用程序中的不同位置，这取决于我收到的 Json 值，我有 2 个案例要导航:

a) 7

b) 1、2、3、4、5、6

case a 打开一个 activity 并且正常工作。case b 在 `MainActivity. “这就是问题所在。”

我尝试以正常 Intent 打开 MainActivity，然后用 fragment 替换它的容器。

当我尝试打开案例 b 时，我在此代码段的第三行中得到了 ClassCastException，因为它无法将 BaseClass 上下文转换为 v4分段。当我只给它属于接收者上下文的 context 时，我得到了同样的异常。

intent = new Intent(context, MainScreen.class);
Fragment fragment = new NotificationFragment();
FragmentTransaction transaction = ((FragmentActivity) context.getApplicationContext()).getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container, fragment).commit();

这是个异常(exception):

FATAL EXCEPTION: main
Process: com.myapp.SomeApp, PID: 9639
java.lang.RuntimeException: Unable to start receiver com.myapp.SomeApp.Receivers.NotifyReceiver: java.lang.ClassCastException: com.myapp.SomeApp.utils.BaseClass cannot be cast to android.support.v4.app.FragmentActivity
 at android.app.ActivityThread.handleReceiver(ActivityThread.java:2616)
 at android.app.ActivityThread.access$1700(ActivityThread.java:151)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:135)
 at android.app.ActivityThread.main(ActivityThread.java:5254)
 at java.lang.reflect.Method.invoke(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:372)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
 at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:114)
 Caused by: java.lang.ClassCastException: com.myapp.SomeApp.utils.BaseClass cannot be cast to android.support.v4.app.FragmentActivity
 at com.myapp.SomeApp.Receivers.NotifyReceiver.onReceive(NotifyReceiver.java:52)
 at android.app.ActivityThread.handleReceiver(ActivityThread.java:2609)
 at android.app.ActivityThread.access$1700(ActivityThread.java:151) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:135) 
 at android.app.ActivityThread.main(ActivityThread.java:5254) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at java.lang.reflect.Method.invoke(Method.java:372) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
 at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:114) 

这是完整的接收者代码:

public class NotifyReceiver extends BroadcastReceiver {

private String title, itemID, notifyType;
private int id;

@Override
public void onReceive(Context context, Intent intent) {

    if (intent != null) {
        try {
            String response = intent.getExtras().getString("com.parse.Data");

            JSONObject data = new JSONObject(response);
            itemID = data.getString("ItemID");
            notifyType = data.getString("NotificationTypeID");
            title = data.getString("alert");

            id = Integer.parseInt(notifyType);
        } catch (JSONException e) {
            Log.e("NotifyReceiver", e.getMessage());
        }
    }
    if (id == 7) {
        intent = new Intent(context, TendersActivity.class);
    } else {
        intent = new Intent(context, MainScreen.class);
        Fragment fragment = new NotificationFragment();
        FragmentTransaction transaction =
                ((FragmentActivity) context.getApplicationContext())
                        .getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.container, fragment).commit();
    }
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

    Notification notify = new NotificationCompat.Builder(context)
            .setContentTitle(context.getResources().getString(R.string.app_name))
            .setContentText(title)
            .setSmallIcon(R.drawable.ic_stat_notify)
            .setContentIntent(pendingIntent)
            .setVibrate(new long[]{250, 250, 250, 250})
            .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
            .setAutoCancel(true)
            .build();

    NotificationManager manager = (NotificationManager)
            context.getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, notify);
    }
}

Answer 1

请用此代码替换您的 else 部分:

else {
        intent = new Intent(context, MainScreen.class);
        resultIntent.putExtra("From", "notifyFrag");
    }

并在您的 MainScreen.class 中检查是否使用此代码从通知键调用的 Activity :

String type = getIntent().getStringExtra("From");
if (type != null) {
    switch (type) {
        case "notifyFrag":
            Fragment fragment = new NotificationFragment();
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.container, fragment).commit();
            break;
    }
}

希望这会有所帮助。