将 bundle.getString() 的结果分配给 String 会抛出 ClassCastException

Question

我有一个名为 spiliaBeach 的 Place Object 实例，它包含您在下面看到的参数：

public PlaceObject spiliaBeach = new PlaceObject(R.string.spilia_beach,R.string.spilia_description,"2 Km from the Port",R.string.beach_category);

PlaceObject.java class:

private int name = 0;
private int description = 0;
private String locationDistance = "distance";
private int category = 0;

PlaceObject(int name, int description, String locationDistance, int category) {
    this.name = name;
    this.description = description;
    this.locationDistance = locationDistance;
    this.category = category;
}

在 MainActivity 中，我将数据通过 Bundle 传递到我的 DetailsActivity，就像这样：

Intent detailsIntent = new Intent(this, DetailsActivity.class);
Bundle intentBundle = new Bundle();
intentBundle.putInt("name",beachDB.spiliaBeach.getName());
intentBundle.putInt("description",beachDB.spiliaBeach.getDescription());
intentBundle.putString("distance",beachDB.spiliaBeach.getLocationDistance());
//Log.d(TAG,"Location distance : " + beachDB.spiliaBeach.getLocationDistance());
//intentBundle.putInt("category",beachDB.spiliaBeach.getCategory());
detailsIntent.putExtra("data",intentBundle);
startActivity(detailsIntent);

并尝试在 DetailsActivity 的 onCreate() 中像这样检索它：

private void getIntentData(Intent intent) {
    Bundle dataBundle = intent.getBundleExtra("data");
    if(dataBundle != null) {
        name = dataBundle.getInt(NAME_KEY);
        description = dataBundle.getInt(DESC_KEY);
        locationDistance = dataBundle.getString(LOC_DIST_KEY);
        Log.d(TAG, "location distance : " + locationDistance + '\n' + "description : " + description);
    } else {
        Log.d(TAG,"Bundle is null");
    }
}

但是 logcat 说 locationDistance 变量是 null 并且它抛出一个 ClassCastException 说当什么都没有时返回的字符串不能转换为整数直接在该行中的整数，对吗？有什么想法吗？

Answer 1

将您的 PlaceObject class 声明为 Parcelable 并按照指南 https://www.vogella.com/tutorials/AndroidParcelable/article.html

实施所有必需的方法

然后您就可以将对象保存为

intentBundle.putParcelable(placeObject);

并将其检索为

Bundle dataBundle = getIntent().getExtras();
PlaceObject object = (PlaceObject) dataBundle.getParcelable(KEY);

编辑： 你传递 R.string.spilia_beach 这是整数 id，为了得到一个字符串使用 getString(R.string.spilia_beach) 等

将 bundle.getString() 的结果分配给 String 会抛出 ClassCastException

Assigning the result of bundle.getString() to a String throws a ClassCastException

java

android

android-intent

android-bundle