我有一個特定的問題。我正在創建一個應用程序,它允許我顯示某些菜餚的菜單。我設計了一個包含TextView和RatingBar的自定義適配器。所以在我的其他Activity(ViewDatabase)中,我從JSON-File(方法名爲showData)中檢索碟名,並將其顯示在獲取自定義適配器的ListView中。Android - 如何處理單個ListViewItem中的多個元素?
我現在的問題是,不知道爲什麼我只能選擇我的菜的名稱(所以我的適配器的textview)或評級欄(也在我的適配器)。
我試圖把方法:myListView.setItemsCanFocus(true);但仍然沒有工作。
我沒有實現一個clicklistener我的文本在適配器?我試圖實現one.I需要一個明確的意圖交換活動,但我不能 從一個Adapterclass轉到其他類的意圖。
在ViewDatabse-類是onItemClick我改變活動如果我點擊文本的方法。
這裏是我的代碼:
- 適配器:
一)
public UserInformationAdapter(Context context, List<UserInformation> objects) {
super(context, R.layout.rating_item, objects);
this.context = context;
table = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.rating_item, null);
}
TextView name = (TextView) v.findViewById(R.id.hauptgerichte);
RatingBar ratingBar = (RatingBar) v.findViewById(R.id.rate_bar);
UserInformation userInformation = table.get(position);
ratingBar.setOnRatingBarChangeListener(onRatingChangedListener(position));
ratingBar.setTag(position);
ratingBar.setRating(getItem(position).getRatingStar());
name.setText(userInformation.getName());
name.setTag(position);
return v;
}
private RatingBar.OnRatingBarChangeListener onRatingChangedListener(final int position) {
return new RatingBar.OnRatingBarChangeListener() {
@Override
public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
UserInformation item = getItem(position);
assert item != null;
item.setRatingStar(v);
Log.i("Adapter", "star: " + v);
}
};
}
}
這是項目(名稱和的RatingBar):
公共類UserInformation {
private String name;
private float ratingStar;
public UserInformation(){
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
void setRatingStar(float ratingStar) {
this.ratingStar = ratingStar;
}
float getRatingStar() {
return 0;
}
@Override
public String toString(){
return name;
}
}
這是檢索名稱的活動:
- 活動:
公共類ViewDatabase延伸AppCompatActivity {
private static final String TAG = "ViewDatabase";
private FirebaseDatabase mFirebaseDatabase;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference myRef;
private String userID;
private ArrayList<String> array;
private final List<UserInformation> arr = new ArrayList<>();
private UserInformationAdapter adapter2;
private ListView mListView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_database_layout);
array = new ArrayList<>();
mListView = (ListView) findViewById(R.id.list_karnivoure);
mListView.setItemsCanFocus(true);
mAuth = FirebaseAuth.getInstance();
mFirebaseDatabase = FirebaseDatabase.getInstance();
myRef = mFirebaseDatabase.getReference();
FirebaseUser user = mAuth.getCurrentUser();
userID = user.getUid();
myRef.child("shakes").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
showData(dataSnapshot);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void showData(DataSnapshot dataSnapshot) {
Iterable<DataSnapshot> children = dataSnapshot.getChildren();
for (DataSnapshot child: children){
UserInformation uInfo = child.getValue(UserInformation.class);
arr.add(uInfo);
adapter2 = new UserInformationAdapter(ViewDatabase.this, arr);
mListView.setAdapter(adapter2);
mListView.setItemsCanFocus(true);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
mListView.setItemsCanFocus(true);
Object listItem = mListView.getItemAtPosition(position);
Intent i = new Intent(ViewDatabase.this,KarnivoureInput.class);
i.putExtra("name", listItem.toString());
startActivity(i);
}
});
}
這個dowsnt爲我工作。我想主要的問題是我沒有一個點擊偵聽器在我的適配器textView。我不知道如何爲textView完全添加一個。我在ViewDatabase類中實現了一個Click Listener,該類中包含「onItemClick」,它爲我提供了整個項目的clicklsitener。這個「onItemClick」返回列表視圖中的菜名,並將其提供給另一個活動。我怎麼能在customAdapter中實現這個意圖? –