[英]Android: ListView text color is invisible and I don't want it invisible
我的Layout
上有兩個ListView
和一個EditText
。 我必須先顯示一個,然后單擊他的一個選項后,我必須顯示另一個ListView
。
一切正常,但是當我必須顯示第二個ListView
,出現了問題,我看不到選項的文本,僅當我按下該選項並且按下它時,我才能看到文本,我可以看到白色的文本(與背景顏色相同)。
我不明白為什么會這樣,因為我定義了一個ListView
像第二個一樣,但是其中一個以黑色顯示文本,第二個以白色顯示。 除了它們的位置,我不更改任何ListView
屬性。 我把代碼和xml文件放在可以幫助的地方,謝謝!
這是我的課程的一部分,所有與ListView
相關:
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;
}
}
這是布局的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>
謝謝大家!
問題出在上下文上,我給的上下文不好,這改變了listview文本的textcolor,第二個listView的正確上下文是:getBaseContext(),所以正確的適配器是:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_expandable_list_item_1, android.R.id.text1, intent.getStringArrayExtra("planos"));
希望這對其他人有幫助! :)
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