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POIntent and StartActivity to go to Market from a Dialog button
 

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    <p>I really can't get my head around Activity, Intent and start.. even after reading Lars Vogels Tutorial (<a href="http://www.vogella.com/articles/AndroidIntent/article.html" rel="nofollow">Tutorial on Intents</a>)</p> <p>I've tried to make the question as clean and simple as possible.</p> <p>2 classes (KKOTestActivity, VersionChangeInfo) and one AndroidManifest.</p> <p>Goal : Class KKOTestActivity starts, fires off VersionChangeInfo. That class shows a dialog with three buttons. One of them is the go-to-market. That's where the problem is. When the user presses that button, I get NPE Error (see error log below). I really don't understand what I'm doing here, so a link to Intents-for-dummies or something would also be highly appreciated :). Thanks!</p> <p>KKOTestActivity :</p> <pre><code>package happyworx.nl.KKOTest; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; public class KKOTestActivity extends Activity implements OnClickListener { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); new VersionChangeInfo(this).show(); } public void onClick(View v) { // TODO Auto-generated method stub } } </code></pre> <p>VersionChangeInfo.java :</p> <pre><code>package happyworx.nl.KKOTest; 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.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.net.Uri; import android.preference.PreferenceManager; public class VersionChangeInfo extends Activity { private String VCI_PREFIX = "vci_"; private Activity mActivity; public VersionChangeInfo(final Activity context) { mActivity = context; } private PackageInfo getPackageInfo() { PackageInfo pi = null; try { pi = mActivity.getPackageManager().getPackageInfo(mActivity.getPackageName(), PackageManager.GET_ACTIVITIES); } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return pi; } public void show() { PackageInfo versionInfo = getPackageInfo(); // the eulaKey changes every time you increment the version number in the AndroidManifest.xml final String eulaKey = VCI_PREFIX + versionInfo.versionCode; final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mActivity); boolean hasBeenShown = prefs.getBoolean(eulaKey, false); if(hasBeenShown == false){ // Show the Eula String title = mActivity.getString(R.string.app_name) + " v" + versionInfo.versionName; //Includes the updates as well so users know what changed. String message = mActivity.getString(R.string.updates) + "\n\n" + mActivity.getString(R.string.eula); AlertDialog.Builder builder = new AlertDialog.Builder(mActivity) .setTitle(title) .setMessage(message) .setPositiveButton("Ga naar Market", new Dialog.OnClickListener() { public void onClick(DialogInterface dialogInterface, int i) { // Mark this version as read. SharedPreferences.Editor editor = prefs.edit(); // editor.putBoolean(eulaKey, true); // editor.commit(); dialogInterface.dismiss(); final Intent MyIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=happyworx.nl.Flashwords")); startActivity(MyIntent); } }) .setNegativeButton("Later", new Dialog.OnClickListener() { public void onClick(DialogInterface dialogInterface, int i) { dialogInterface.dismiss(); } }) .setNeutralButton("Niet meer tonen", new Dialog.OnClickListener(){ public void onClick(DialogInterface dialogInterface, int i) { SharedPreferences.Editor editor = prefs.edit(); editor.putBoolean(eulaKey, true); editor.commit(); dialogInterface.dismiss(); } }) ; builder.create().show(); } } } </code></pre> <p>AndroidManifest.xls</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="happyworx.nl.KKOTest" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="4" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" &gt; &lt;activity android:name=".KKOTestActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".VersionChangeInfo" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>Error Log :</p> <pre><code>04-19 08:06:45.711: E/AndroidRuntime(15186): FATAL EXCEPTION: main 04-19 08:06:45.711: E/AndroidRuntime(15186): java.lang.NullPointerException 04-19 08:06:45.711: E/AndroidRuntime(15186): at android.app.Activity.startActivityForResult(Activity.java:2827) 04-19 08:06:45.711: E/AndroidRuntime(15186): at android.app.Activity.startActivity(Activity.java:2933) 04-19 08:06:45.711: E/AndroidRuntime(15186): at happyworx.nl.KKOTest.VersionChangeInfo$1.onClick(VersionChangeInfo.java:63) 04-19 08:06:45.711: E/AndroidRuntime(15186): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:159) 04-19 08:06:45.711: E/AndroidRuntime(15186): at android.os.Handler.dispatchMessage(Handler.java:99) 04-19 08:06:45.711: E/AndroidRuntime(15186): at android.os.Looper.loop(Looper.java:123) 04-19 08:06:45.711: E/AndroidRuntime(15186): at android.app.ActivityThread.main(ActivityThread.java:3683) 04-19 08:06:45.711: E/AndroidRuntime(15186): at java.lang.reflect.Method.invokeNative(Native Method) 04-19 08:06:45.711: E/AndroidRuntime(15186): at java.lang.reflect.Method.invoke(Method.java:507) 04-19 08:06:45.711: E/AndroidRuntime(15186): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 04-19 08:06:45.711: E/AndroidRuntime(15186): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 04-19 08:06:45.711: E/AndroidRuntime(15186): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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