[英]How to pass data from a fragment class to an activity
拜托,我在向Activity
發送ArrayList
數據時遇到問題。
數據是 URL 保存在ArrayList
但使用捆綁附加功能后,我收到 null 指針異常。 我也嘗試捕獲異常,但我使用 get extra string 獲得的數據仍然是 null
// below is the code i used to pass the data
Bundle extras = new Bundle();
extras.putString("VidUrl",VideoLecturesUrl.get(position));
extras.putString("bookUrl",bookUrl.get(position));
extras.putString("VidTitle",titleList.get(position));
Intent intent = new Intent(getActivity(),DetailsView.class);
intent.putExtras(extras);
startActivity(intent);
// below is the receiving activity
Intent intent = getIntent();
extras =intent.getExtras();
if (extras!=null){
try {
Video_Url = extras.getString("VidUrl");
BookUrl = extras.getString("bookUrl");
Title = extras.getString("VidTitle");
Toast.makeText(this,Video_Url,Toast.LENGTH_SHORT).show();
Toast.makeText(this,BookUrl,Toast.LENGTH_SHORT).show();
Toast.makeText(this,Title,Toast.LENGTH_SHORT).show();
videotexTitle.setText(Title);
setTitle(Title);
setVideo(Video_Url.toString());
}catch (Exception e){
e.printStackTrace();
}
} else {
Toast.makeText(this, "the extrass is empty", Toast.LENGTH_SHORT).show();
}
在片段中
public interface NoticeFragmentListener {
public void onFragmentSendArray(ArrayType yourArray);
}
NoticeFragmentListener listener;
@Override
public void onAttach(Context context) {
super.onAttach(context);
// Verify that the host activity implements the callback interface
try {
// Instantiate the NoticeFragmentListener so we can send events to the host
listener = (NoticeFragmentListener) context;
} catch (ClassCastException e) {
// The activity doesn't implement the interface, throw exception
}
}
//metod to send array
public void SendArray(ArrayType yourArray){listener.onFragmentSendArray(yourArray);}
在活動中
public class yourActivity extends AppCompatActivity implements YourFragment.NoticeFragmentListener
並接收數組
@Override
public onFragmentSendArray(ArrayType yourArray) {
}
為簡單起見,為此目的使用 SharedPreferences
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