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POCatch statements not working in android
 

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    <p>I am working with an android database oriented program. This activity is from one of my tab. When i press that particular tab it will get the value from the db and if any null values from the db it will catch it and show an alertbox and changing to another tab. This is my logic. But it is not executing the catch block. It is going straight to the webview and showing there a null value. Please anyone help me to fix this error.Here is my class...</p> <p><strong>LocationActivity</strong> </p> <pre><code>import java.util.List; import android.annotation.SuppressLint; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.Window; import android.webkit.WebChromeClient; import android.webkit.WebSettings; import android.webkit.WebView; import android.widget.ProgressBar; @SuppressLint("SetJavaScriptEnabled") public class LocationActivity extends Activity { MainTabActivity mainTab; WebView mWebView; GPSTracker g; double my_lat, my_lon; String lat, lon, to_lat, to_lon, addressText, temp_lat, temp_lon; DatabaseHandler db; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); db = new DatabaseHandler(this); g = new GPSTracker(this); Log.d("Reading: ", "Location Activity Reading all Values"); List&lt;Datas&gt; datas = db.getAllDatas(); for (Datas dat : datas) { try{ to_lat = dat.getlat(); to_lon = dat.getlon(); }catch(NullPointerException e){ AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setTitle("Oops!"); // set dialog message alert .setMessage("Please select a destination before finding your route!") .setCancelable(false) .setPositiveButton("ok",new DialogInterface.OnClickListener() { @SuppressWarnings("deprecation") public void onClick(DialogInterface dialog,int id) { ((MainTabActivity)getParent()).getTabHost().setCurrentTab(0); } }); // create alert dialog AlertDialog alertDialog = alert.create(); // show it alertDialog.show(); Log.d(to_lat, to_lon); System.out.println("Frim thap thee "+ to_lat + " " + to_lon); } } setContentView(R.layout.webview); getWindow().setFeatureInt(Window.FEATURE_PROGRESS,Window.PROGRESS_VISIBILITY_ON); final ProgressBar pb = (ProgressBar) findViewById(R.id.progressBar1); pb.setVisibility(View.VISIBLE); my_lat = g.getLatitude(); my_lon = g.getLongitude(); lat = String.valueOf(my_lat); lon = String.valueOf(my_lon); mWebView = (WebView)findViewById(R.id.webview1); mWebView.setWebChromeClient(new WebChromeClient() { public void onProgressChanged(WebView view, int progress) { pb.setProgress(progress); if (progress == 100) { pb.setVisibility(View.GONE); } } }); WebSettings webSettings = mWebView.getSettings(); webSettings.setJavaScriptEnabled(true); mWebView.setWebViewClient(new HelloWebViewClient()); addressText = lat + "," + lon + "+to:" + to_lat + ","+ to_lon; addressText = addressText.replaceAll(" ", "%20"); addressText = addressText.replaceAll("#", "%23"); mWebView.loadUrl("http://maps.google.com/maps?q=from:"+ addressText); } } </code></pre>
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    1. USДмитрий Иванович Менделеев
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    1. COMaybe your Datas never throws NullPointerException
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      1. POCatch statements not working in android
      1. USAlexander Kulyakhtin
    2. COit throws null pointer exception
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      1. POCatch statements not working in android
      1. USДмитрий Иванович Менделеев
 

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