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[英]Android passing data while using Activity, Fragment, Listview and Tabs
[英]Passing Data from Fragment to Activity using listview
我使用 Android Studio 使用此代碼,嘗試將數據從片段發送到活動,但出現錯誤。 我正在使用帶有列表的CardView
,但是當我在按下ListView
時嘗試從片段獲取更多信息時,它給了我一個錯誤並且應用程序崩潰了。
地點片段:
public class PlacesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.list_view, container, false);
final ArrayList<Word> words = new ArrayList<Word>();
words.add(new Word(R.string.place1,R.string.about1,R.string.address1,R.string.time1,R.drawable.medinam1));
words.add(new Word(R.string.place2,R.string.about2,R.string.address2,R.string.time2,R.drawable.medinam2));
words.add(new Word(R.string.place3,R.string.about3,R.string.address3,R.string.time3,R.drawable.medinam3));
WordAdapter adapter = new WordAdapter(getActivity(), words);
ListView listView = (ListView)rootView.findViewById(R.id.listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Word clickedCard = (Word) parent.getItemAtPosition(position);
//Intent intent = new Intent(PlacesFragment.this, InformationActivity.class);
Intent intent = new Intent(getActivity(),InformationActivity.class);
intent.putExtra("pic_name", clickedCard.getImage());
intent.putExtra("info_name", clickedCard.getName());
intent.putExtra("some_information", clickedCard.getInfo());
intent.putExtra("addressTextView", clickedCard.getAddress());
intent.putExtra("timeTextView", clickedCard.getTime());
startActivity(intent);
}
});
return rootView;
}
}
信息活動:
public class InformationActivity extends AppCompatActivity {
private ImageView imageView;
private TextView nameOfpic;
private TextView nameOfInfo;
private TextView nameOfAdress;
private TextView nameOfTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_information);
imageView = findViewById(R.id.pic_name);
nameOfpic = findViewById(R.id.info_name);
nameOfInfo = findViewById(R.id.some_information);
nameOfAdress = findViewById(R.id.addressTextView);
nameOfTime = findViewById(R.id.timeTextView);
Intent intent = getIntent();
imageView.setImageResource(intent.getIntExtra("pic_name",R.id.pic_name));
nameOfpic.setText(intent.getStringExtra("info_name"));
nameOfInfo.setText(intent.getStringExtra("some_information"));
nameOfAdress.setText(intent.getStringExtra("addressTextView"));
nameOfTime.setText(intent.getStringExtra("timeTextView"));
}
}
您可以通過這種方式從 Fragment 啟動 Activity,實際上您不需要這樣做,因為該 Activity 已經存在並持有該 Fragment。
您應該做的是制作一個如下所示的回調接口:
public interface PlacesInterface {
void onListViewItemClicked(Word word);
}
然后通過 InformationActivity 實現這個接口,如下所示:
public class InformationActivity extends AppCompatActivity implements PlacesInterface {
private ImageView imageView;
private TextView nameOfpic;
private TextView nameOfInfo;
private TextView nameOfAdress;
private TextView nameOfTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_information);
imageView = findViewById(R.id.pic_name);
nameOfpic = findViewById(R.id.info_name);
nameOfInfo = findViewById(R.id.some_information);
nameOfAdress = findViewById(R.id.addressTextView);
nameOfTime = findViewById(R.id.timeTextView);
Intent intent = getIntent();
imageView.setImageResource(intent.getIntExtra("pic_name",R.id.pic_name));
nameOfpic.setText(intent.getStringExtra("info_name"));
nameOfInfo.setText(intent.getStringExtra("some_information"));
nameOfAdress.setText(intent.getStringExtra("addressTextView"));
nameOfTime.setText(intent.getStringExtra("timeTextView"));
}
@Override
public void onDataStateChange(Word word) {
//Do what you want inside the activity with data passed from the clicked Item
}
}
最后在 PlacesFragment 中執行以下操作:
public class PlacesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.list_view, container, false);
final ArrayList<Word> words = new ArrayList<Word>();
words.add(new Word(R.string.place1,R.string.about1,R.string.address1,R.string.time1,R.drawable.medinam1));
words.add(new Word(R.string.place2,R.string.about2,R.string.address2,R.string.time2,R.drawable.medinam2));
words.add(new Word(R.string.place3,R.string.about3,R.string.address3,R.string.time3,R.drawable.medinam3));
WordAdapter adapter = new WordAdapter(getActivity(), words);
ListView listView = (ListView)rootView.findViewById(R.id.listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Word clickedCard = (Word) parent.getItemAtPosition(position);
//HERE IS THE NEW PART, PAY ATTENTION
((PlacesInterface)getActivity).onListViewItemClicked(clickedWord);
}
});
return rootView;
}
}
在項目單擊偵聽器中按位置從適配器獲取項目...試試這個....
public class PlacesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.list_view, container, false);
final ArrayList<Word> words = new ArrayList<Word>();
words.add(new Word(R.string.place1,R.string.about1,R.string.address1,R.string.time1,R.drawable.medinam1));
words.add(new Word(R.string.place2,R.string.about2,R.string.address2,R.string.time2,R.drawable.medinam2));
words.add(new Word(R.string.place3,R.string.about3,R.string.address3,R.string.time3,R.drawable.medinam3));
final WordAdapter adapter = new WordAdapter(getActivity(), words);
ListView listView = (ListView)rootView.findViewById(R.id.listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Word clickedCard = adapter.getItem(position);
//Intent intent = new Intent(PlacesFragment.this, InformationActivity.class);
Intent intent = new Intent(getActivity(),InformationActivity.class);
intent.putExtra("pic_name", clickedCard.getImage());
intent.putExtra("info_name", clickedCard.getName());
intent.putExtra("some_information", clickedCard.getInfo());
intent.putExtra("addressTextView", clickedCard.getAddress());
intent.putExtra("timeTextView", clickedCard.getTime());
startActivity(intent);
}
});
return rootView;
}
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