Question

我有以下代码：

JSONArray arr = new JSONArray();
JSONObject obj = new JSONObject();
obj.put("message", message);
obj.put("flag", flag);
obj.put("intent", intent);
arr.put(obj);
Utility.saveDataLocally(getApplicationContext(), Constants.SOME_CONST, arr.toString());

其中intent是Intent类的对象。现在，在Utility中保存这个JSONArray后，我想从另一个活动中检索这个保存的JSONArray，所以我正在做同样的事情：

String s = Utility.getSaveDataLocally(this, Constants.SOME_CONST);
JSONArray arr = new JSONArray(s);
//Below works
String m = arr.getJSONObject(0).getString("message");
//But below doesn't (obviously).
Intent i = arr.getJSONObject(0).getIntent("intent");

请告诉我如何实现上述目标？也就是说，通过Android中的JSONObject传递一个intent，并从另一端正确接收它？

Answer 1

我建议您制作一个 arrayList of hash-map ，然后将页面名称作为键值对。这样您也可以导航到该页面以及数据，请尝试这对它有帮助。

Answer 2

第1步：为通知创建POJO类（比如说）哪个是可分区的...因此您可以将此类对象从一个活动解析为其他

public class Notification implements Parcelable {
/**
 * message : you have successfully registered
 * flag : 0
 * intent : incoming msg
 */

private String message;
private int flag;
private String intent;

public void setMessage(String message) {
    this.message = message;
}

public void setFlag(int flag) {
    this.flag = flag;
}

public void setIntent(String intent) {
    this.intent = intent;
}

public String getMessage() {
    return message;
}

public int getFlag() {
    return flag;
}

public String getIntent() {
    return intent;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(this.message);
    dest.writeInt(this.flag);
    dest.writeString(this.intent);
}

public Notification() {
}

protected Notification(Parcel in) {
    this.message = in.readString();
    this.flag = in.readInt();
    this.intent = in.readString();
}

public static final Parcelable.Creator<Notification> CREATOR = new Parcelable.Creator<Notification>() {
    public Notification createFromParcel(Parcel source) {
        return new Notification(source);
    }

    public Notification[] newArray(int size) {
        return new Notification[size];
    }
};
}

第2步：第一个活动代码..这里我们使用google的GSON库（将json对象序列化或反序列化为java对象）

private static final String NOTIFICATIONS="NOTIFICATIONS";
try {
        JSONObject obj = new JSONObject();
        obj.put("message", "you have successfully registered");
        obj.put("flag", 0);
        obj.put("intent", "incoming msg");

        Gson gson=new Gson();
        ArrayList<Notification> notificationList=new ArrayList<>();
        Notification notification=gson.fromJson(obj.toString(), Notification.class);
        notificationList.add(notification);

        Intent intent=new Intent(MainActivity.this, Main2Activity.class);
        intent.putParcelableArrayListExtra(NOTIFICATIONS, notificationList);
        startActivity(intent);
    }
    catch (JSONException je)
    {
        je.printStackTrace();
    }

第2步：获取通知的可分配数据的第二个活动代码

private static final String NOTIFICATIONS="NOTIFICATIONS";
ArrayList<Notification> notifications=getIntent().getExtras().getParcelableArrayList(NOTIFICATIONS);
    for(Notification notification: notifications)
    {
        Log.d("NOTIFICATIONS", "Message = "+notification.getMessage());
        Log.d("NOTIFICATIONS", "Flag = "+notification.getFlag());
        Log.d("NOTIFICATIONS", "Intent = "+notification.getIntent());
        Log.d("NOTIFICATIONS", "");
    }

在Android中通过JSONObject传递意图

2 个答案: