我正在尝试将数组列表从一个 Activity 传递到另一个 Activity 的 fragment 。我搜索了很多解决方案,但无法得到有效的答案。
这是我传递数组列表的地方。
Intent intent = new Intent(SizeActivity.this,CartActivity.class);
intent.putExtra("PrintList", photoPrintsList);
startActivity(intent);
接受带有 fragment 的 Activity 。
public class ExampleActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
if (savedInstanceState == null) {
Fragment newFragment = new CartActivityFragment();
newFragment.setArguments(getIntent().getExtras());
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.commit();
}
}
这就是 fragment 。如何将数据从一个 Activity 传递到另一个 fragment 。
private ArrayList<PhotoPrints> printsArrayList = new ArrayList<>();
private String TAG = "CartActivityFragment";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_cart, container, false);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Bundle b = getArguments();
if(b != null) {
Log.d(TAG,b.size() + "");
printsArrayList = b.getParcelableArrayList("PrintList");
Log.d(TAG,"Got arraylist");
} else {
Log.d(TAG,"Null");
}
}
编辑:
我发现我的 fragment 的 onCreateView 在持有 Activity 的 onCreate 之前被调用。这样我就无法将数据从 Activity 中继到 fragment 。看看日志。
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivityFragment﹕ Null checker
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivityFragment﹕ Null
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ Received Arraylist
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 0 /storage/emulated/0/WhatsApp/Media/WhatsApp Images/Sent/IMG-20150913-WA0014.jpg
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 0 4 X 6
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 0 Glossy
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 0 Economy
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 0 6
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 1 /storage/emulated/0/WhatsApp/Media/WhatsApp Images/Sent/IMG-20150913-WA0015.jpg
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 1 4 X 6
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 1 Glossy
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 1 Economy
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 1 6
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 2 /storage/emulated/0/WhatsApp/Media/WhatsApp Images/Sent/IMG-20150915-WA0003.jpg
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 2 4 X 6
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 2 Glossy
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 2 Economy
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ 2 6
09-21 17:21:32.539 22672-22672/in.reduxpress D/CartActivity﹕ Size of bundle 1
如何绕过这种行为?
Edit2:我已经进行了广泛的测试。我能够成功接收 Activity 中的数据。我把它放在一个包中并将包设置为参数。但我无法接收 fragment 中的 bundle 。它总是给我一个空值。
我尝试将 getArguments 放在 onCreateView 和 onActivityCreated 中,两者都不起作用。请帮忙。
最佳答案
尝试这个,
这是我传递 arraylist 的代码:
Intent intent = getIntent();
intent.putExtra("key", selectImages);
setResult(RESULT_OK, intent);
finish();
这是 onActivityResult()。
public void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == 999) {
@SuppressWarnings("unchecked")
ArrayList<String> ar1 = data.getStringArrayListExtra("key");
if(ar1.size()!= 0){
for (int i = 0; i < ar1.size(); i++) {
String value = ar1.get(i);
Toast.makeText(getActivity(),
"Path of array in home Fragment: "+ar1,
Toast.LENGTH_LONG).show();
} } } }
这是 Myparcelable 类代码:
import java.util.ArrayList;
import android.os.Parcel;
import android.os.Parcelable;
public class ObjectA implements Parcelable {
public ArrayList<String> choices;
public ObjectA (ArrayList<String> choices) {
this.choices = choices;
}
@SuppressWarnings("unchecked")
public ObjectA (Parcel parcel) {
parcel.readArrayList(null);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeStringList(choices);
}
// Method to recreate a ObjectA from a Parcel
public static Creator<ObjectA> CREATOR = new Creator<ObjectA>() {
@Override
public ObjectA createFromParcel(Parcel source) {
return new ObjectA(source);
}
@Override
public ObjectA[] newArray(int size) {
return new ObjectA[size];
}
};
}
而已。
关于java - 将arraylist从一个 Activity 传递到另一个 Activity 的 fragment ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32692838/