Estoy creando una aplicación con actividad de preferencia donde las entradas de preferencia de la lista se asignan problemáticamente. Esta aplicación funciona muy bien en mi emulador pero al mismo tiempo probar mi aplicación en el móvil que muestra error como esteNullPointerException en android.widget.ArrayAdapter.createViewFromResource
FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)
at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
at android.widget.AbsListView.obtainView(AbsListView.java:2033)
Este problema surge cuando hago clic listpreference que en mi móvil. aquí es mi código
prference.xml
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="@string/settings">
<ListPreference
android:key="@string/resolution"
android:title="@string/imageres"
android:summary="@string/summaryres"
android:dialogTitle="@string/resFormat"
/>
</PreferenceCategory>
</PreferenceScreen>
settings.java
package com.example;
import android.database.Cursor;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.PreferenceActivity;
public class Settings extends PreferenceActivity {
private SQLiteoperations SQLiteAdapter;
DTO get;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
get = (DTO) getIntent().getExtras().get("obj");
SQLiteAdapter = new SQLiteoperations(this);
SQLiteAdapter.openToWrite();
addPreferencesFromResource(R.xml.preferences);
ListPreference pref = (ListPreference) findPreference("resolution");
pref.setEntries(getEntries());
pref.setEntryValues(getEntries());
System.out.println("after set entries");
System.out.println(get.getDefaultvalues());
pref.setDefaultValue(get.getDefaultvalues());
}
private CharSequence[] getEntries() {
Cursor cursor = SQLiteAdapter.queueAll();
int num = cursor.getCount();
String[] size = new String[num];
System.out.println(cursor.getCount());
if (cursor.moveToFirst()){
int i=0;
do{
size[i]=new String(cursor.getString(1)+"X"+cursor.getString(2));
System.out.println(cursor.getString(1)+"X"+cursor.getString(2));
}while(cursor.moveToNext());
}
cursor.close();
return size;
}
}
camerademo.java
package com.example;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Iterator;
import java.util.List;
import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TableRow.LayoutParams;
import android.widget.TextView;
public class CameraDemo extends Activity {
private final int DIALOG_LICENSE=5;
private final int MENU_SETTINGS=2;
private SharedPreferences settings;
private static final String TAG = "CameraDemo";
Camera camera;
Preview preview;
Button buttonClick,buttonSave,buttonBack;
byte[] image;
private static SQLiteoperations placeData;
final DTO set = new DTO();
String defsize;
// Called when the activity is first created.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
placeData = new SQLiteoperations(this);
placeData.openToWrite();
preview = new Preview(this);
((FrameLayout) findViewById(R.id.preview)).addView(preview);
buttonSave = (Button) findViewById(R.id.Save);
buttonBack = (Button) findViewById(R.id.back);
buttonBack.setVisibility(View.INVISIBLE);
buttonSave.setVisibility(View.INVISIBLE);
buttonClick = (Button) findViewById(R.id.buttonClick);
settings = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences licensPref = getSharedPreferences("PREFS", 0);
boolean licenseShown = licensPref.getBoolean("LicenseShown", false);
if(!licenseShown)
showDialog(DIALOG_LICENSE);
buttonClick.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
preview.camera.takePicture(shutterCallback, rawCallback,
jpegCallback);
buttonClick.setVisibility(View.INVISIBLE);
buttonSave.setVisibility(View.VISIBLE);
buttonBack.setVisibility(View.VISIBLE);
}
});
buttonBack.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
back();
}
});
buttonSave.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
save();
}
});
Log.d(TAG, "onCreate'd");
}
ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter() {
Log.d(TAG, "onShutter'd");
}
};
// Handles data for raw picture
PictureCallback rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.d(TAG, "onPictureTaken - raw");
}
};
// Handles data for jpeg picture
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
image = data;
}
};
@Override
protected void onPrepareDialog(int id, Dialog dialog) {
super.onPrepareDialog(id, dialog);
}
@Override
protected Dialog onCreateDialog(int id) {
switch(id){
case DIALOG_LICENSE:
return new AlertDialog.Builder(this)
.setTitle(R.string.welcome)
.setMessage(R.string.welcome_text)
.setPositiveButton(R.string.accept, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
settings = getSharedPreferences("PREFS", 0);
Parameters parameters = preview.camera.getParameters();
Size defaultsize = parameters.getPictureSize();
defsize = (new String(defaultsize.width+"X"+defaultsize.height));
List<Camera.Size> size = parameters.getSupportedPictureSizes();
int num = size.size();
String[] sizeArray = new String[num];
int i=0;
Iterator<Size> si = size.iterator();
while (si.hasNext()) {
Camera.Size sizeObj = (Size) si.next();
sizeArray[i]=new String(sizeObj.width+ "X" +sizeObj.height);
Log.e("size in licence dialog", sizeObj.height+"x"+sizeObj.width);
i++;
placeData.insert(String.valueOf(sizeObj.width),String.valueOf(sizeObj.height));
}
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("LicenseShown", true);
editor.commit();
}
})
.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
finish();
}
})
.setCancelable(false)
.create();
}
return null;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuItem mi;
mi = menu.add(0, MENU_SETTINGS, 0, R.string.settings);
mi.setIcon(android.R.drawable.ic_menu_preferences);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case MENU_SETTINGS:
set.setDefaultvalues(defsize);
Intent intent = new Intent(getApplicationContext(), Settings.class);
intent.putExtra("obj", set);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
public void back(){
preview.camera.startPreview();
buttonBack.setVisibility(View.INVISIBLE);
buttonSave.setVisibility(View.INVISIBLE);
buttonClick.setVisibility(View.VISIBLE);
}
@Override
public void onDestroy(){
super.onDestroy();
if(preview.camera != null){
preview.camera.stopPreview();
preview.camera = null;
}
}
public void save(){
back();
}
}
Cualquier persona satisface decir dónde estoy equivocado?
¿Puede usted añadir más StackTrace ..... me refiero a la línea en la que está recibiendo NullPointer error –
Este registro lo recibí en el móvil mediante el uso de la aplicación catlog. No puedo obtener más información de eso. – ponraj
@ponraj, conecte su dispositivo al sistema y puede ver los registros en logcat de eclipse, más stack-trace ayudará a detectar el problema fater –