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Ich erstelle eine Anwendung mit Vorzugsaktivität, wo die Listpreference Einträge problematisch zugeordnet sind. Diese Anwendung funktioniert auf meinem Emulator in Ordnung, aber während ich in der mobilen meine Anwendung zu testen zeigt es Fehler wie dieseNullPointerException bei 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)
Dieses Problem entsteht, wenn ich das listpreference in meinem Handy klicken. hier ist mein Code
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();
}
}
jemand bitte sagen, wo ich falsch bin?
Sie bitte mehr stacktrace hinzufügen ..... meine ich die Linie, wo Sie Nullpointer bekommen Fehler –
Dieses Protokoll habe ich in Mobile mit Catlog App. Ich kann nicht mehr Informationen bekommen. – ponraj
@ponraj, verbinden Sie Ihr Gerät mit dem System und Sie können Protokolle in Logcat von Eclipse anzeigen, mehr Stack-Trace wird helfen, Problem zu erkennen –