单击某项时,从列表视图获取ID到DetailActivity?

时间:2018-10-26 16:53:34

标签: java android listview android-arrayadapter onitemclicklistener

我在数据库ID中有一列,当单击列表视图项时,我想获取此ID。但是,当我运行app> error时:不幸的是,应用程序已停止! :(请帮助我!

MainActivity.java

public class MainActivity extends AppCompatActivity {

    DBHelper dbHelper;
    ListView listView;
    ArrayList<TuDienAVModel> list_Word;
    TuDienAVAdapter tuDienAVAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dbHelper = new DBHelper(this);

        listView = findViewById(R.id.listView);

        list_Word = new ArrayList<>();
        list_Word = dbHelper.getAnhViet();

        tuDienAVAdapter = new TuDienAVAdapter(MainActivity.this,
                R.layout.layout_item,
                list_Word);

        listView.setAdapter(tuDienAVAdapter);

//        listView = ( ListView ) findViewById (R.id. listView );
//        list_Word = new ArrayList <TuDienAVModel>() ;
//        list_Word . addAll ( dbHelper . getAnhViet ());
//        lvAdapter = new LVAdapter (this , R. layout . layout_item , list_Word );
//        listView. setAdapter ( lvAdapter );

        listView. setOnItemClickListener ( new AdapterView. OnItemClickListener
                (){
            public void onItemClick ( AdapterView <?> arg0 , View arg1 ,
                                      int arg2 , long arg3 ) {
                Intent intent = new Intent ( MainActivity .this ,
                        DetailTuDienActivity. class );
                TuDienAVModel av  = (TuDienAVModel) listView.getAdapter().getItem(arg2);
                Toast.makeText(MainActivity.this, av.getId() + " selected", Toast.LENGTH_LONG).show();
                intent . putExtra ("id", av.getId());
                startActivity ( intent );
            }
        });



        registerForContextMenu(listView);
    }

TuDienAVAdapter.java

public class TuDienAVAdapter extends ArrayAdapter<TuDienAVModel> {

Context context;
int layout;
ArrayList<TuDienAVModel> arrayList;
ArrayList<TuDienAVModel> arrayListFilter;

int layout_id ;


public TuDienAVAdapter(@NonNull Context context, int resource, @NonNull ArrayList<TuDienAVModel> model) {
    super(context, resource, model);
    this.context = context;
    this.layout = resource;
    this.arrayList = model;
    this.arrayListFilter = model;
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    LayoutInflater inflater = LayoutInflater.from(context);
    convertView = inflater.inflate(layout,null);

    TuDienAVModel tuDienAVModel=arrayList.get(position);

    Log.d("ABC", position+"");


    TextView txt_word = convertView.findViewById(R.id.textView_Word);
    txt_word.setText(tuDienAVModel.getEnglish());

    return convertView;
}


@Override
public int getCount() {
    return arrayList.size();
}

DBHelper.java

    public TuDienAVModel detailTuVung ( int _id ) {

    db = context.openOrCreateDatabase(DATABASE_NAME,context.MODE_PRIVATE,null);
    String s = " SELECT * FROM tbl_AnhViet where id=" +_id;
    Cursor cursor = db. rawQuery (s, null );
    cursor . moveToFirst ();
    TuDienAVModel av = new TuDienAVModel (cursor . getInt (0) ,
            cursor . getString (1) ,cursor . getString (2) );
    cursor . close ();
    db . close ();
    return av ;
}

DetailTuDienActivity.java

public class DetailTuDienActivity extends AppCompatActivity {

WebView webView;
TextView textView;

DBHelper db;
TuDienAVModel tuDienAVModel;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super . onCreate ( savedInstanceState );
    setContentView (R. layout.activity_detail_tu_dien );
    int id = getIntent (). getIntExtra ("id", 0);
    db = new DBHelper ( getApplicationContext ());
    TuDienAVModel av = db.detailTuVung(id);
    if(av != null ){
        TextView txtEn = ( TextView ) findViewById (R.id.textView_English
        );
        txtEn . setText ( av.getEnglish());

    }

}

我在数据库ID中有一列,当单击列表视图项时,我想获取此ID。但是,当我运行app> error时:不幸的是,应用程序已停止! :(请帮助我!

0 个答案:

没有答案