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我有一個問題，當我們想要插入數據到數據庫表時，它返回一個空指針異常作爲「Failure deliver result resultInfo」。 我不知道它爲什麼會被刪除？在db中插入空指針異常
請建議我解決這個問題。
錯誤Srtack：
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { act=com.google.zxing.client.android.SCAN flg=0x80000 (has extras) }} to activity {com.shopzilla.android.common/com.shopzilla.android.common.MainActivity}: java.lang.NullPointerException
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.ActivityThread.deliverResults(ActivityThread.java:3515)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3557)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.ActivityThread.access$2800(ActivityThread.java:125)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2063)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.os.Handler.dispatchMessage(Handler.java:99)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.os.Looper.loop(Looper.java:123)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at java.lang.reflect.Method.invokeNative(Native Method)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at java.lang.reflect.Method.invoke(Method.java:521)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at dalvik.system.NativeStart.main(Native Method)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): Caused by: java.lang.NullPointerException
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at com.shopzilla.android.common.MainActivity.onActivityResult(MainActivity.java:210)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.Activity.dispatchActivityResult(Activity.java:3890)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): at android.app.ActivityThread.deliverResults(ActivityThread.java:3511)
08-05 16:18:39.816: ERROR/AndroidRuntime(5045): ... 11 more
代碼：
package com.shopzilla.android.common;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.LinearGradient;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.flurry.android.FlurryAgent;
import com.shopzilla.android.client.dto.ProductSearchRequest;
import com.shopzilla.android.client.model.BaseInventoryItem;
import com.shopzilla.android.client.model.CatalogResponse;
import com.shopzilla.android.product.ProductComparisonActivity;
import com.shopzilla.android.search.SearchResultActivity;
import java.util.ArrayList;
import java.util.Locale;
public class MainActivity extends Activity {
/**
* Called when the activity is first created.
*/
private LocationManager locationManager;
private Location currentLocation;
static ArrayList<String> recent = new ArrayList<String>();
SQLiteDatabase db;
static String keyword;
EditText txt_search;
public static Boolean zipcode = false;
public static String zip = "";
String lat;
String longi;
public static String status = "";
Dialog dialog;
public static int count = 0;
ContentValues values;
private static final String CREATE_RECENT_BARCODE_TABLE = "create table if not exists recentbarcode(prod TEXT,status TEXT,image TEXT);";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.btn_Search);
Button btn_scanbar = (Button) findViewById(R.id.btn_ScanBar);
txt_search = (EditText) findViewById(R.id.txt_Search);
//Create Favorites DataBase
final SQLiteDatabase db = openOrCreateDatabase("recentsearches2.db", SQLiteDatabase.CREATE_IF_NECESSARY, null);
db.setVersion(1);
db.setLocale(Locale.getDefault());
db.setLockingEnabled(true);
db.execSQL(CREATE_RECENT_BARCODE_TABLE);
values = new ContentValues();
if (count == 0) {
showDialog(0);
}
//Open Search Result Activity
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
recent.add(txt_search.getText().toString());
keyword = txt_search.getText().toString();
if (!keyword.equals("")) {
Intent intent = new Intent(MainActivity.this, SearchResultActivity.class);
intent.putExtra("keyword", txt_search.getText().toString());
startActivity(intent);
} else {
Toast.makeText(MainActivity.this, "Please Enter a Search Text in a Search Box.", Toast.LENGTH_SHORT).show();
}
}
});
//Open Scan BarCode Activity
btn_scanbar.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
try {
Intent intent = new Intent("com.google.zxing.client.android.SCAN");
intent.setPackage("com.google.zxing.client.android");
intent.putExtra("SCAN_MODE", "PRODUCT_MODE");
startActivityForResult(intent, 0);
} catch (Exception e) {
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("BIZRATE");
alertDialog.setMessage("Download BarCode Scanner App!!");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent viewIntent =
new Intent("android.intent.action.VIEW",
Uri.parse("https://market.android.com/details?id=com.google.zxing.client.android"));
startActivity(viewIntent);
return;
}
});
alertDialog.setButton2("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
return;
} });
alertDialog.show();
}
}
});
//Geo Coding
this.locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Subscribe to the location manager's updates on the current location
this.locationManager.requestLocationUpdates("gps", (long) 30000, (float) 10.0, new LocationListener() {
public void onLocationChanged(Location arg0) {
handleLocationChanged(arg0);
}
public void onProviderDisabled(String arg0) {
}
public void onProviderEnabled(String arg0) {
}
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
}
});
txt_search.setOnEditorActionListener(new EditText.OnEditorActionListener() {
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE) {
recent.add(txt_search.getText().toString());
keyword = txt_search.getText().toString();
if (!keyword.equals("")) {
Intent intent = new Intent(MainActivity.this, SearchResultActivity.class);
intent.putExtra("keyword", txt_search.getText().toString());
startActivity(intent);
} else {
Toast.makeText(MainActivity.this, "Please Enter a Search Text in a Search Box.", Toast.LENGTH_SHORT).show();
}
}
return false;
}
});
}
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
String contents = intent.getStringExtra("SCAN_RESULT");
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
// perform the barcode search immediately after getting the scan
ProductSearchRequest barcodeSearch = ProductSearchRequestFactory.createProductSearchRequest();
barcodeSearch.setProductId(contents);
barcodeSearch.setZipCode("90291");
barcodeSearch.setResultsOffers(25);
CatalogResponse barcodeResponse = CatalogServiceLocator.getCatalogAPIClient().performSearch(barcodeSearch);
BaseInventoryItem item = null;
// check to see if the searched scan returned an offer
if(barcodeResponse.getOffers() != null && !barcodeResponse.getOffers().isEmpty()){
item = barcodeResponse.getOffers().get(0);
}
// check to see if the searched scan returned a product
if(barcodeResponse.getProducts() != null && !barcodeResponse.getProducts().isEmpty()){
item = barcodeResponse.getProducts().get(0);
}
if(item != null) {
// Send the user directly to product comparison activity, with the item returned by the scan
Intent searchIntent = new Intent(MainActivity.this, ProductComparisonActivity.class);
searchIntent.putExtra("item", item);
startActivity(searchIntent);
/* values = new ContentValues();*/
values.put("prod",contents);
values.put("status","Product Found");
values.put("image",item.getImageUrl(60));
} else {
Toast.makeText(MainActivity.this, "Product Not Found on Bizrate", Toast.LENGTH_SHORT).show();
/* values = new ContentValues();*/
values.put("prod",contents);
values.put("status","Product Not Found");
values.put("image","");
long id = db.insert("recentbarcode",null,values); //-----------> Here is the Problem
}
/* long id = db.insert("recentbarcode",null,values);
db.close();*/
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(MainActivity.this, "Scan Cancelled.", Toast.LENGTH_SHORT).show();
}
}
}
private void handleLocationChanged(Location loc) {
// Save the latest location
this.currentLocation = loc;
// Update the latitude & longitude TextViews
lat = Double.toString(loc.getLatitude());
longi = Double.toString(loc.getLongitude());
}
private void handleReverseGeocodeClick() {
if (this.currentLocation != null) {
// Kickoff an asynchronous task to fire the reverse geocoding
// request off to google
ReverseGeocodeLookupTask task = new ReverseGeocodeLookupTask();
task.applicationContext = this;
task.execute();
} else {
// If we don't know our location yet, we can't do reverse
// geocoding - display a please wait message
showToast("Please wait until we have a location fix from the gps");
}
}
public void showToast(CharSequence message) {
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(getApplicationContext(), message, duration);
toast.show();
}
public class ReverseGeocodeLookupTask extends AsyncTask<Void, Void, String> {
private ProgressDialog dialog;
protected Context applicationContext;
@Override
protected void onPreExecute() {
this.dialog = ProgressDialog.show(applicationContext, "Please wait...contacting the tubes.",
"Requesting reverse geocode lookup", true);
}
@Override
protected String doInBackground(Void... params) {
String localityName = "";
if (currentLocation != null) {
localityName = Geocoder.reverseGeocode(currentLocation);
}
return localityName;
}
@Override
protected void onPostExecute(String result) {
//this.dialog.cancel();
zip = result;
dialog.dismiss();
}
}
protected Dialog onCreateDialog(int id) {
switch (id) {
case 0:
count = 1;
dialog = new Dialog(this);
//dialog.setTitle("");
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.geocode);
dialog.show();
Button btn_getGeo = (Button) dialog.findViewById(R.id.btn_Geo_Ok);
Button btn_cancel = (Button) dialog.findViewById(R.id.btn_Geo_cancel);
btn_getGeo.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
zipcode = true;
handleReverseGeocodeClick();
//dialog.dismiss();
removeDialog(0);
}
});
btn_cancel.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
removeDialog(0);
}
});
break;
}
return dialog;
}
//Flurry Implementation
public void onStart() {
super.onStart();
FlurryAgent.onStartSession(this, "AJT5DWUVF6IAE78NQV69");
// your code
}
public void onStop() {
super.onStop();
FlurryAgent.onEndSession(this);
// your code
}
}
我認爲有一個概率。與ypur db ....是完全創建？ – Hanry
如何檢查我的數據庫是否完美創建？ –
來自DDMS，你可以通過eclipse插件看到它： 它可以在>> coderzheaven.com/2011/04/sqlitemanager-plugin-for-eclipse/ – Hanry