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POChange between two class but the program has stopped. Why?
 

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  1. POChange between two class but the program has stopped. Why?
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    <p>I have two classes in program. I want when user clicks on the two first buttons, the program go to first class(Main Class). I don't use fragment. I write this code but when run the program and click on the Places button, the program has stopped. Why?(before i add button clicks, the program correct run). LogCat write nullexception but i can't find where is null?! Please help me.</p> <p>Location.java</p> <pre><code>public class Location extends MapActivity { private FrameLayout linear; private MapView map; private MapController controller; private EditText text_location; GeoPoint searchLocation; GeoPoint mylocation; double myLatitude=0; double myLongitude=0; List&lt;Overlay&gt; mapOverlays; Drawable drawable; SimpleItemizedOverlay itemizedOverlay; //Other classes private Button mHome; private Button mProduct; private Button mPlaces; private WebView mWebView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.location); initOtherButtons(); //.... } private void initOtherButtons(){ mHome=(Button)findViewById(R.id.button_home); mProduct=(Button)findViewById(R.id.button_product); mPlaces=(Button)findViewById(R.id.button_places); mWebView=(WebView)findViewById(R.id.web_view); //TEST mHome.setOnClickListener(onClickListener); mProduct.setOnClickListener(onClickListener); } private OnClickListener onClickListener=new OnClickListener(){ Intent i=new Intent(Location.this,Main.class); public void onClick(View v){ switch(v.getId()){ case R.id.button_home: startActivity(i); break; case R.id.button_product: startActivity(i); break; } } }; } </code></pre> <p>Main.java</p> <pre><code>public class Main extends Activity { private WebView mWebView; private Button mHome; private Button mProduct; private Button mPlaces; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mWebView = (WebView)findViewById(R.id.web_view); mWebView.loadUrl("http://www.google.com"); mHome = (Button)findViewById(R.id.button_home); mProduct=(Button)findViewById(R.id.button_product); mPlaces=(Button)findViewById(R.id.button_places); mHome.setOnClickListener(onClickListener); mProduct.setOnClickListener(onClickListener); mPlaces.setOnClickListener(onClickListener); } private OnClickListener onClickListener=new OnClickListener(){ public void onClick(View v){ switch(v.getId()){ case R.id.button_home: mWebView.loadUrl("http://www.google.com"); break; case R.id.button_product: mWebView.loadUrl("http://www.google.com"); break; case R.id.button_places: Intent i=new Intent(Main.this,Location.class); startActivity(i); break; } } }; } </code></pre> <p>Manifest.xml:</p> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.example.loyaltier" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="9" android:targetSdkVersion="15" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;uses-library android:name="com.google.android.maps" /&gt; &lt;activity android:name=".Main" android:label="@string/title_activity_main" &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=".Location" android:label="@string/Location_title"&gt; &lt;/activity&gt; &lt;activity android:name=".SimpleItemizedOverlay" android:label="@string/app_name"&gt; &lt;/activity&gt; &lt;activity android:name=".BalloonOverlayView" android:label="@string/app_name"&gt; &lt;/activity&gt; &lt;activity android:name=".BalloonItemizedOverlay" android:label="@string/app_name"&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>LogCat:</p> <pre><code>11-11 09:56:16.506: D/OpenGLRenderer(18214): Flushing caches (mode 1) 11-11 09:56:16.506: D/OpenGLRenderer(18214): Flushing caches (mode 0) 11-11 09:56:38.006: D/dalvikvm(18275): GC_CONCURRENT freed 172K, 2% free 14351K/14599K, paused 9ms+2ms 11-11 09:56:38.053: D/dalvikvm(18275): GC_FOR_ALLOC freed 7K, 2% free 14715K/14983K, paused 11ms 11-11 09:56:39.287: D/AndroidRuntime(18275): Shutting down VM 11-11 09:56:39.287: W/dalvikvm(18275): threadid=1: thread exiting with uncaught exception (group=0x40a891f8) 11-11 09:56:39.295: E/AndroidRuntime(18275): FATAL EXCEPTION: main 11-11 09:56:39.295: E/AndroidRuntime(18275): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.example.loyaltier/org.example.loyaltier.Location}: java.lang.NullPointerException 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1879) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.ActivityThread.access$600(ActivityThread.java:122) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.os.Handler.dispatchMessage(Handler.java:99) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.os.Looper.loop(Looper.java:137) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.ActivityThread.main(ActivityThread.java:4340) 11-11 09:56:39.295: E/AndroidRuntime(18275): at java.lang.reflect.Method.invokeNative(Native Method) 11-11 09:56:39.295: E/AndroidRuntime(18275): at java.lang.reflect.Method.invoke(Method.java:511) 11-11 09:56:39.295: E/AndroidRuntime(18275): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 11-11 09:56:39.295: E/AndroidRuntime(18275): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 11-11 09:56:39.295: E/AndroidRuntime(18275): at dalvik.system.NativeStart.main(Native Method) 11-11 09:56:39.295: E/AndroidRuntime(18275): Caused by: java.lang.NullPointerException 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:127) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.content.ComponentName.&lt;init&gt;(ComponentName.java:75) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.content.Intent.&lt;init&gt;(In tent.java:3004) 11-11 09:56:39.295: E/AndroidRuntime(18275): at org.example.loyaltier.Location$1.&lt;init&gt;(Location.java:118) 11-11 09:56:39.295: E/AndroidRuntime(18275): at org.example.loyaltier.Location.&lt;init&gt;(Location.java:117) 11-11 09:56:39.295: E/AndroidRuntime(18275): at java.lang.Class.newInstanceImpl(Native Method) 11-11 09:56:39.295: E/AndroidRuntime(18275): at java.lang.Class.newInstance(Class.java:1319) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.Instrumentation.newActivity(Instrumentation.java:1023) 11-11 09:56:39.295: E/AndroidRuntime(18275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1870) 11-11 09:56:39.295: E/AndroidRuntime(18275): ... 11 more </code></pre> <p>EDIT: SIMPLE Program</p> <pre><code>private OnClickListener onClickListener=new OnClickListener(){ public void onClick(View v){ switch(v.getId()){ case R.id.button_home: mWebView.loadUrl("http://www.google.com"); break; } } }; </code></pre>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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