NullPointerException en android.widget.ArrayAdapter.createViewFromResource

Question

Oct 10, 2012, 04:25 PM

android preferenceactivity android-camera android-preferences

NullPointerException en android.widget.ArrayAdapter.createViewFromResource

Estoy creando una aplicación con actividad de preferencia donde las entradas de referencia de lista están asignadas problemáticamente. Esta aplicación funciona bien en mi emulador, pero mientras pruebo mi aplicación en un dispositivo móvil, muestra un error como este.

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 en esa lista de referencia en mi móvil. aqui esta mi codigo

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();
            }
}

Alguien por favor di donde me equivoco?