Question

I’m having some problems with android webview, SQLite and my target device. On a physical device, the database is not accessible(see errors at the end).

The setup of the webview:

    settings.setJavaScriptEnabled(true);
    settings.setDatabaseEnabled(true);
    settings.setDatabasePath("/data/data/de.sqlite.webview/databases"); 

I’m defining the webview in the onCreate method, and setting the update quota twice as high as estimated or bigger than in the HTML5 definition.

mWebView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onExceededDatabaseQuota(String url, String databaseIdentifier, long currentQuota, long estimatedSize, long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater)
    {
            quotaUpdater.updateQuota(204801); //estimatedSize * 2
    }
}); 


    mWebView.setWebViewClient(new WebViewClient() {                 
    @Override
    public boolean shouldOverrideUrlLoading( ... ) 
    }

On the Emulator and on Chrome everything works fine, but if I deploy the app to my galaxys2 I’m getting an error: openDatabase is not defined.

The following html-code works in chrome and in the emulated webview:

    db = new HKSQL();
    db.openSQL();
    today = getTodayDate();
    createDbTable_LastLogin();

    //HKSQL Class 
    function HkSQL(){
    this.query;
    this.result;
    this.database;
    }

    HkSQL.prototype.openSQL = function(){
    this.database = openDatabase("hkapp","1.0","HKApp","65536");    
    } 

    //an example query to create my db
    CREATE TABLE IF NOT EXISTS HK_lastlogin (id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, datum TEXT NOT NULL)

I have no clue why it doesn’t work on my device. I thought about read and write permissions, but the .db file is already created.
Here are some error messages which, I think, target to the same problem:

Uncaught ReferenceError: openDatabase is not defined 
Uncaught TypeError: Object [object DOMWindow] has no method 'openDatabase'

Answer 1

The answer was that both Webviews need to initialized as WebChromeClients with full features.

myWebView = (WebView) findViewById(R.id.l_webview);

myWebView.setWebViewClient(new WebViewClient() {  });
myWebView.setWebChromeClient(new WebChromeClient() { ... } );


myWebView2 = (WebView) findViewById(R.id.l_navi);

myWebView2.setWebViewClient(new WebViewClient() {        });
myWebView2.setWebChromeClient(new WebChromeClient() { ... } );