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我想在我的preferenceActivity上使用自定義佈局來顯示用戶選擇了什麼，我不知道我在這裏失蹤了什麼，但似乎TextView的是空的，我不知道爲什麼，這裏是日誌說：Android java.lang.NullPointerException嘗試在偏好活動上使用自定義佈局
java.lang.NullPointerException
at br.com.representemais.FiltrarActivity$1.onPreferenceChange(FiltrarActivity.java:106)
FiltrarActivity.java:106 = textValue.setText（pData.getEntries（）[指數]）;
@SuppressWarnings("ALL")
public class FiltrarActivity extends PreferenceActivity {
private String preferencesName = "";
private ActionBar actionBar;
private String defaultValue;
private ListPreference pData;
private ListPreference pStatus;
private TextView textValue;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final SecurePreferences mSessao = new SecurePreferences(getApplicationContext(), "sessao");
String menuAtual = (mSessao.getString("menuAtual") != null) ? mSessao.getString("menuAtual") : "Pedidos";
setTitle("Filtrar " + menuAtual);
actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
preferencesName = getIntent().getExtras().getString(NavigationMain.FILTRO);
// set the preferences file name
getPreferenceManager().setSharedPreferencesName(preferencesName);
if (menuAtual.equals("Viagens")) {
} else if (menuAtual.equals("Pedidos")) {
addPreferencesFromResource(R.xml.filtrar);
pData = (ListPreference) findPreference("prefData");
pData.setLayoutResource(R.layout.pref_data);
textValue = (TextView) findViewById(R.id.escolhaData);
pData.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
// @Override
public boolean onPreferenceChange(Preference preference,
Object newValue) {
int index = pData.findIndexOfValue(newValue.toString());
if (index != -1) {
SharedPreferences customSharedPreference = getSharedPreferences("prefData", 0);
SharedPreferences.Editor editor = customSharedPreference.edit();
editor.putString("listentries", (String) newValue);
editor.commit();
SecurePreferences mSessao = new SecurePreferences(getApplicationContext(), "sessao");
mSessao.put("filtro_pedidos_data", (String) newValue);
textValue.setText(pData.getEntries()[index]);
}
System.out.println("Escolheu >>> " + mSessao.getString("filtro_pedidos_data"));
return true;
}
});
pStatus = (ListPreference) findPreference("prefStatus");
pStatus.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
// @Override
public boolean onPreferenceChange(Preference preference,
Object newValue) {
SharedPreferences customSharedPreference = getSharedPreferences("prefStatus", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = customSharedPreference.edit();
editor.putString("listStatus", (String) newValue);
editor.commit();
System.out.println("Escolheu >>> " + newValue);
return true;
}
});
Preference mResetButton = findPreference("Reset");
mResetButton.setOnPreferenceClickListener(new OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference arg0) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(FiltrarActivity.this);
alertDialog.setMessage("Você deseja realmente limpar os filtros atuais?");
alertDialog.setTitle("Filtro");
alertDialog.setCancelable(true);
alertDialog.setPositiveButton("Sim", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
SharedPreferences.Editor editor = settings.edit();
editor.clear();
editor.commit();
} });
alertDialog.setNegativeButton("Não", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
} });
alertDialog.show();
return false;
}
});
} else if (menuAtual.equals("Clientes")) {// codigo
}
}
public interface BackPressedListener {
void onBackPressed();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public boolean onOptionsItemSelected(MenuItem item) {
Fragment fragment = getFragmentManager().findFragmentByTag("");
if (fragment != null && fragment instanceof BackPressedListener) {
((BackPressedListener) fragment).onBackPressed();
} else {
super.onBackPressed();
overridePendingTransition(R.anim.animation_back, R.anim.animation_back_leave);
}
return true;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
public void onBackPressed() {
Fragment fragment = getFragmentManager().findFragmentByTag("");
if (fragment != null && fragment instanceof BackPressedListener) {
((BackPressedListener) fragment).onBackPressed();
} else {
super.onBackPressed();
overridePendingTransition(R.anim.animation_back, R.anim.animation_back_leave);
}
}
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2"
android:gravity="center"
android:paddingTop="10dp"
android:paddingBottom="10dp">
<TextView
android:id="@+id/filtrarData"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Refinar Data"
android:textColor="@color/black"
android:textSize="@dimen/detalhe_cliente"
android:entries="@array/listentries"
android:entryValues="@array/listvalues"
android:layout_weight="1"
android:padding="10dp"
android:gravity="left" />
<TextView
android:id="@+id/escolhaData"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text=""
android:textColor="@color/blue_dark"
android:textSize="@dimen/detalhe_cliente"
android:entries="@array/listentries"
android:entryValues="@array/listvalues"
android:layout_weight="1"
android:padding="10dp"
android:gravity="right" />
</LinearLayout>
</LinearLayout>
pref_xml：
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="@string/fDataTitulo">
<ListPreference
android:dialogTitle="@string/fDataTitulo"
android:summary="@string/fDataSummary"
android:key="prefData"
android:entries="@array/listentries"
android:entryValues="@array/listvalues"
android:defaultValue="Mais Antiga"/>
</PreferenceCategory>
<PreferenceCategory android:title="@string/fValorTitulo">
<br.com.representemais.MyDialogShow
android:dialogTitle="@string/fValorTitulo"
android:key="prefValor"
android:summary="Entre o valor desejado"
android:positiveButtonText="OK"
android:negativeButtonText="Cancel" />
</PreferenceCategory>
<PreferenceCategory android:title="@string/fStatusTitulo">
<ListPreference
android:dialogTitle="@string/fStatusTitulo"
android:summary="@string/fStatusSummary"
android:key="prefStatus"
android:entries="@array/listStatus"
android:entryValues="@array/list_status_values"/>
</PreferenceCategory>
<PreferenceCategory android:title="@string/fReset">
<Preference
android:layout="@layout/dialog_reset"
android:key="Reset"
android:enabled="true"
/>
</PreferenceCategory>
</PreferenceScreen>