What is the output of logcat under "Caused by:" ?
And don't extend your JavaScript callback from "test".
Activities represent "UI screens" and are managed by Android. Defining
and instantiating one yourself, bypassing the framework, is a recipe for
disaster.
-- Kostya
17.12.2010 11:14, cuil yahoo пишет:
This thing has started to irritate me,
I have copied the code below,
this is test.java, the main class of my program.
package android.test;
import android.app.Activity;
import android.content.ContentValues;
import android.database.sqlite.*;
import android.os.Bundle;
import android.util.*;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import seeta.socialcalc.R;
class JavaScriptInterface extends test{
String saveme;
public JavaScriptInterface(test test) {
// TODO Auto-generated constructor stub
}
public void gotit(String s)
{
saveme=s;
final String got="gotit";
insertvalues(s);
Log.d(got, s);
}
private void insertvalues(String s)
{
databaseopener dataBasehelper = new databaseopener(this);
SQLiteDatabase db = dataBasehelper.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(databaseopener.data, "data");
db.insert("textdata", databaseopener.data, cv);
db.close();
}
}
public class test extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.d("test" , "got till here1");
WebView web = (WebView) findViewById(R.id.webView);
web.getSettings().setJavaScriptEnabled(true);
web.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
web.getSettings().setPluginsEnabled(false);
web.getSettings().setSupportMultipleWindows(false);
web.getSettings().setSupportZoom(false);
web.setVerticalScrollBarEnabled(false);
web.setHorizontalScrollBarEnabled(false);
web.addJavascriptInterface(new JavaScriptInterface(this),
"Android");
//Our application's main page will be loaded
web.loadUrl("file:///android_asset/index.html");
web.setWebViewClient(new WebViewClient() {
@Override public boolean shouldOverrideUrlLoading(WebView
view, String url) {
return false;
}
});
}
}
The next class helps implement databases,
package android.test;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.SQLException;
public class databaseopener extends SQLiteOpenHelper
{
private static final String database_name = "mydatabase.db";
static String data = "Data";
public databaseopener(Context context)
{
super(context, database_name, null, 1);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
android.util.Log.d("database", "database about to be created");
db.execSQL( "CREATE TABLE textdata (_id INTEGER PRIMARY KEY
AUTOINCREMENT, data TEXT);");
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int
newVersion) {
// i don't want to upgrade right now, first want the database
to be created.
// TODO Auto-generated method stub
}
}
Any Pointers on errors would be appreciated.
Cuil
On Fri, Dec 17, 2010 at 1:34 PM, Kostya Vasilyev <[email protected]
<mailto:[email protected]>> wrote:
It looks like a problem in your JavaScriptInterface.insertValues.
There should be more in the logcat below what you posted, starting
with "Caused by:".
-- Kostya
17.12.2010 10:31, cuil yahoo пишет:
I went through some online material both blogs and videos, and
managed to rectify the code. However, now i get a
NullPointerException,
12-17 12:48:44.184: INFO/dalvikvm(327): at
android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
12-17 12:48:44.194: INFO/dalvikvm(327): at
android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98)
12-17 12:48:44.194: INFO/dalvikvm(327): at
android.test.JavaScriptInterface.insertvalues(test.java:32)
12-17 12:48:44.224: INFO/dalvikvm(327): at
android.test.JavaScriptInterface.gotit(test.java:23)
12-17 12:48:44.224: INFO/dalvikvm(327): at
android.webkit.WebViewCore.nativeTouchUp(Native Method)
12-17 12:48:44.224: INFO/dalvikvm(327): at
android.webkit.WebViewCore.nativeTouchUp(Native Method)
12-17 12:48:44.244: INFO/dalvikvm(327): at
android.webkit.WebViewCore.access$3300(WebViewCore.java:52)
12-17 12:48:44.254: INFO/dalvikvm(327): at
android.webkit.WebViewCore$EventHub$1.handleMessage(WebViewCore.java:1150)
12-17 12:48:44.264: INFO/dalvikvm(327): at
android.os.Handler.dispatchMessage(Handler.java:99)
12-17 12:48:44.304: INFO/dalvikvm(327): at
android.os.Looper.loop(Looper.java:123)
12-17 12:48:44.304: INFO/dalvikvm(327): at
android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:621)
12-17 12:48:44.334: INFO/dalvikvm(327): at
java.lang.Thread.run(Thread.java:1096)
It would be helpful if someone could provide some pointers to
handle this. I could use catch and finally blocks, but the
database should open atleast.
Thanks.
Cuil
On Thu, Dec 16, 2010 at 6:23 PM, cuil yahoo <[email protected]
<mailto:[email protected]>> wrote:
Hello,
I am trying to use a database to store a huge text in it
serially(using a primary key, for easy searching).
I have already done the following things,
1. Created a SQLite database(named database) using the SQLite
Database Browser, and have imported that to my assets folder
in Eclipse. The database has two fields one _id(primarykey)
and saveme(the text field).
2. Now, i want to write stuff in this database, however when
i try to open the database using the code below, i get a
SQLite Code 14 type of an error( which on a google result
showed up error on opening of database).
SQLiteDatabase writedatabase = null;
writedatabase.openDatabase("file:///android_asset/database",null,0);
writedatabase.execSQL("INSERT INTO " + "database" + " Values
('1', 'first')");
It would be really very helpful, if someone could please
point the error in the steps.
Thanks.
Cuil
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