1
我在我的Layout
上有兩個ListView
和一個EditText
。我必須先展示一個,點擊其中一個選項後,我必須展示另一個ListView
。Android:ListView文本顏色是不可見的,我不希望它不可見
一切工作正常,但是當我必須拿出第二ListView
出現的問題,我不能看到選項的文字,我只能看到文字時,我按下選項,並按下我可以看到白色的文字(與背景顏色相同)。
我不明白爲什麼會發生這種情況,因爲我的ListView
一個像第二個那樣定義,但其中一個顯示黑色文本和第二個白色文本。除了它們的位置,我不會更改任何ListView
屬性。我把代碼和xml文件,如果它可以幫助,謝謝!
這裏是我的課的一部分,所有與ListView
S:
public class activitySelectEnvironment extends Activity{
ListView lvEnvironment;
ListView lvPlanes;
@SuppressLint("InlinedApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE);
setContentView(R.layout.activity_select_environment);
myIntent = new Intent();
lvEnvironment = (ListView)findViewById(R.id.listViewEnvironment);
lvPlanes = (ListView)findViewById(R.id.listViewPlane);
//lvPlanes.setVisibility(View.GONE);
lvEnvironment.setVisibility(View.VISIBLE);
}
@Override
public void onResume()
{
super.onResume();
registerReceiver(receptorBroadcast, filtroIntents);
if (!verificaConexion(getApplicationContext()))
{
Toast.makeText(getApplicationContext(), "No hay conexión a Internet.", Toast.LENGTH_SHORT).show();
}
else
{
RequestEdificios re = new RequestEdificios(this, IP, user, password);
re.execute("");
}
}
@Override
public void onPause()
{
super.onPause();
this.unregisterReceiver(receptorBroadcast);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/*******************************************************/
/******** Receptor de broadcast ********/
/*******************************************************/
public class ReceptorBroadcast extends BroadcastReceiver
{
@Override
public void onReceive(Context arg0, Intent intent)
{
if(RequestEdificios.ACTION_SINCRONIZACION_FINALIZADA.equals(intent.getAction()))
{
buildingId = intent.getStringArrayListExtra("id_edificio");
buildingArray = intent.getStringArrayListExtra("buildingArray");
RefrescaPantalla(intent.getStringArrayExtra("edificios"));
}
if(RequestPlanes.ACTION_SINCRONIZACION_PLANES_FINALIZADA.equals(intent.getAction()))
{
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_expandable_list_item_1, android.R.id.text1, intent.getStringArrayExtra("planos"));
lvEnvironment.setVisibility(View.GONE);
//lvPlanes.setVisibility(View.VISIBLE);
//Assign adapter to ListView
lvPlanes.setAdapter(adapter);
//ListView Item Click Listener
lvPlanes.setOnItemClickListener(new OnItemClickListener()
{
/* code */
}
});
}
if(InsertPaths.ACTION_SINCRONIZACION_INSERT_FINALIZADA.equals(intent.getAction()))
{
Toast.makeText(getApplicationContext(), "Plano subido a la base de datos." , Toast.LENGTH_LONG).show();
myIntent.setClass(activitySelectEnvironment.this, activitySelectFoot.class);
startActivity(myIntent);
}
}
}
private void RefrescaPantalla(String[] result)
{
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, android.R.id.text1, result);
//Assign adapter to ListView
lvEnvironment.setAdapter(adapter);
//ListView Item Click Listener
lvEnvironment.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
if (!verificaConexion(getApplicationContext()))
{
Toast.makeText(getApplicationContext(), "No hay conexión a Internet.", Toast.LENGTH_SHORT).show();
}
else
{
/* code */
}
}
});
}
public static boolean verificaConexion(Context ctx)
{
boolean bConectado = false;
ConnectivityManager connec = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
// No sólo wifi, también GPRS
NetworkInfo[] redes = connec.getAllNetworkInfo();
// este bucle debería no ser tan ñapa
for (int i = 0; i < 2; i++)
{
// ¿Tenemos conexión? ponemos a true
if (redes[i].getState() == NetworkInfo.State.CONNECTED)
{
bConectado = true;
}
}
return bConectado;
}
}
這裏是佈局的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/txtHead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="78dp"
android:layout_marginTop="39dp"
android:background="@drawable/edittext_rounded_corners"
android:text="Primero indique a que planta pertenece y después seleccione el edificio:"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="25dp" />
<ListView
android:id="@+id/listViewEnvironment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtHead"
android:layout_below="@+id/txtHead"
android:layout_marginTop="30dp" >
</ListView>
<ListView
android:id="@+id/listViewPlane"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtHead"
android:layout_below="@+id/txtHead"
android:layout_marginTop="30dp" >
</ListView>
</RelativeLayout>
感謝所有!
在哪個版本和設備上運行你的應用程序? –
@MayurRaval我使用的是android 4.4 API等級:19 – Imrik
@MayurRaval我添加了你告訴我的這一行,但它不會改變任何東西:( – Imrik