i´m new to android and im tryin to hide or show a Textview in my items from a listview from JSON.
The idea is to show and to custom a textview with a custom background and style if the date exists.
if date doesn't exist, then hide the textview in that item.
i know tha my be a realy stypid question, but i can't seem to find the right answer anyware.
PrimerActivity.JAVA
public void showJSON(String response) {
ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray result = jsonObject.getJSONArray(Search_data_anuncios.JSON_ARRAY);
for (int i = 0; i < result.length(); i++) {
JSONObject jo = result.getJSONObject(i);
String titulo = jo.getString(Search_data_anuncios.KEY_titulo_anuncio_cliente);
String descripcion = jo.getString(Search_data_anuncios.KEY_descripcion_anuncio_cliente);
String fecha_creacion = jo.getString(Search_data_anuncios.KEY_fecha_creacion_anuncio_cliente);
String categoria_anuncio_cliente = jo.getString(Search_data_anuncios.KEY_categoria_anuncio_cliente);
Log.i(TAG_activity, "AQUI - " + categoria_anuncio_cliente);
//change_img_item(categoria_anuncio_cliente, i);
final HashMap<String, String> oferta = new HashMap<>();
oferta.put(Search_data_anuncios.KEY_titulo_anuncio_cliente, titulo);
oferta.put(Search_data_anuncios.KEY_descripcion_anuncio_cliente, descripcion);
oferta.put(Search_data_anuncios.KEY_fecha_creacion_anuncio_cliente, fecha_creacion);
oferta.put(Search_data_anuncios.KEY_categoria_anuncio_cliente, categoria_anuncio_cliente);
list.add(oferta);
}
} catch (JSONException e) {
e.printStackTrace();
}
ListAdapter adapter = new SimpleAdapter(
PrimerActivity.this, list, R.layout.activity_anuncio_item_listview,
new String[]{Search_data_anuncios.KEY_titulo_anuncio_cliente, Search_data_anuncios.KEY_descripcion_anuncio_cliente, Search_data_anuncios.KEY_fecha_creacion_anuncio_cliente, Search_data_anuncios.KEY_categoria_anuncio_cliente},
new int[]{R.id.tv_titulo, R.id.tv_descripcion, R.id.tvclass});
anunt.setAdapter(adapter);}
}
ACTIVITY_PRIMER.XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<ListView
android:id="@+id/listView_anunt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="2dp"
android:layout_marginBottom="57dp"
android:dividerHeight="10dp">
</ListView>
</RelativeLayout>
activity_anuncio_item_listview.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:orientation="horizontal"
android:outlineAmbientShadowColor="@color/black"
android:paddingBottom="0dp">
<LinearLayout
android:layout_width="111dp"
android:layout_height="83dp">
<ImageView
android:id="@+id/item_listview_img"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginLeft="-20dp"
android:src="@drawable/recuest2" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_titulo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="txt tit"
android:textAlignment="center"
android:textAppearance="@style/TextAppearance.AppCompat.Light.SearchResult.Title" />
<TextView
android:id="@+id/tv_descripcion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="txt des" />
<TextView
android:id="@+id/tvclass"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="txt dat"
android:textAppearance="@style/TextAppearance.AppCompat" />
</LinearLayout>
</LinearLayout>
First, you need to change your adapter to another, for example ArrayAdapter. Inside getView method you can describe the logic for displaying what you need depending on the data. Below I showed an example, based on your datatype.
public class TestAdapter extends ArrayAdapter<HashMap<String, String>> {
public TestAdapter(Context context, ArrayList<HashMap<String, String>> data) {
super(context, 0, data);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_anuncio_item_listview, parent, false);
}
/*getting the model one by one*/
HashMap<String, String> item = getItem(position);
/*we get some view*/
TextView textDescription = (TextView) convertView.findViewById(R.id.tv_descripcion);
/*we get some value from model*/
String testValue = item.get("tet_key");
/*check if empty then hide the view*/
if (testValue == null) {
textDescription.setVisibility(View.GONE);
} else {
textDescription.setText(testValue);
textDescription.setVisibility(View.VISIBLE);
}
return convertView;
}
}
inside MainActivity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
HashMap<String, String> model1 = new HashMap<>();
HashMap<String, String> model2 = new HashMap<>();
model2.put("tet_key", "test");
list.add(model1);
list.add(model2);
ListView listView = findViewById(R.id.listView_anunt);
TestAdapter adapter = new TestAdapter(this, list);
listView.setAdapter(adapter);
}
}
result
PS.I advise you to use instead of ListView -> RecyclerView, and also instead of HashMap<> it is better to use some model with fields and convert the data from the server to this model using GSON.