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PONewbie - Force close on simple method
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  1. PONewbie - Force close on simple method
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    copied!<p>xml and logcat now added, now custom view code, unfortunately i am away from devel computer so i cant check your suggestions, @jems, i may have the wrong constructor for my custom view? @Falmarri, i think the build target is 2.2</p> <p>Hopefully a simple thing I don't know about:</p> <p>I have a main game activity, and this calls a class which i have extended from the view class. Here it is, in working form:</p> <pre><code>public class guappsXOMainGame extends Activity { private static final int cellsX=10; private static final int cellsY=10; private guappsXOBoardView mBoardView; @Override public void onCreate(Bundle bund) { super.onCreate(bund); setContentView(R.layout.gamescreen);//loads xml layout called gamescreen mBoardView = (guappsXOBoardView) findViewById(R.id.boardview); } </code></pre> <p>It all was going well, showing my game screen well, until I tried the following, which gives a force close:</p> <pre><code>public void onCreate(Bundle bund) { super.onCreate(bund); setContentView(R.layout.gamescreen);//loads xml layout called gamescreen mBoardView = (guappsXOBoardView) findViewById(R.id.boardview); mBoardView.hello();//problem line } </code></pre> <p>What I want is to run a method that will get some info from the guappsxoboardview class, and this was the test case. The method looks like this:</p> <pre><code> public void hello(){ int x = 1; } </code></pre> <p>LogCat says:</p> <pre><code>01-29 20:50:46.415: INFO/ActivityManager(60): Starting activity: Intent { cmp=com.guapps/.guappsXOMainGame } 01-29 20:50:46.535: DEBUG/AndroidRuntime(564): Shutting down VM 01-29 20:50:46.535: WARN/dalvikvm(564): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): FATAL EXCEPTION: main 01-29 20:50:46.566: ERROR/AndroidRuntime(564): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.guapps/com.guapps.guappsXOMainGame}: java.lang.NullPointerException 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.os.Handler.dispatchMessage(Handler.java:99) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.os.Looper.loop(Looper.java:123) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.ActivityThread.main(ActivityThread.java:4627) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at java.lang.reflect.Method.invokeNative(Native Method) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at java.lang.reflect.Method.invoke(Method.java:521) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at dalvik.system.NativeStart.main(Native Method) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): Caused by: java.lang.NullPointerException 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at com.guapps.guappsXOMainGame.onCreate(guappsXOMainGame.java:38) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 01-29 20:50:46.566: ERROR/AndroidRuntime(564): ... 11 more 01-29 20:50:46.596: WARN/ActivityManager(60): Force finishing activity com.guapps/.guappsXOMainGame 01-29 20:50:46.596: WARN/ActivityManager(60): Force finishing activity com.guapps/.guappsXOStart 01-29 20:50:46.745: DEBUG/dalvikvm(60): GC_FOR_MALLOC freed 7966 objects / 468848 bytes in 99ms 01-29 20:50:47.108: WARN/ActivityManager(60): Activity pause timeout for HistoryRecord{44009a08 com.guapps/.guappsXOMainGame} 01-29 20:50:48.375: INFO/Process(564): Sending signal. PID: 564 SIG: 9 01-29 20:50:48.385: INFO/ActivityManager(60): Process com.guapps (pid 564) has died. 01-29 20:50:48.385: INFO/WindowManager(60): WIN DEATH: Window{440530d0 com.guapps/com.guapps.guappsXOStart paused=true} 01-29 20:50:48.445: WARN/InputManagerService(60): Got RemoteException sending setActive(false) notification to pid 564 uid 10032 01-29 20:50:57.482: WARN/ActivityManager(60): Activity destroy timeout for HistoryRecord{43fc4248 com.guapps/.guappsXOStart} 01-29 20:50:57.488: WARN/ActivityManager(60): Activity destroy timeout for HistoryRecord{44009a08 com.guapps/.guappsXOMainGame} </code></pre> <p>Here is the XML for this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center_horizontal" &gt; &lt;com.guapps.guappsXOBoardView android:id="@+id/boardview" android:layout_width="match_parent" android:layout_height="match_parent" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Hopefully I have done something obvious wrong, thanks.</p> <p>Now most of the custom view code also:</p> <pre><code>package com.guapps; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.RectF; import android.util.AttributeSet; import android.view.View; public class guappsXOBoardView extends View { int screenHeight; int screenWidth; Context mContext; private float leftG; private float topG; private float rightG; private float botG; Bitmap boardGrid; public guappsXOBoardView(Context context, AttributeSet attrs) { super(context); requestFocus(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ screenWidth = View.MeasureSpec.getSize(widthMeasureSpec); screenHeight = View.MeasureSpec.getSize(heightMeasureSpec); setMeasuredDimension(screenWidth, screenHeight); } @Override protected void onDraw(Canvas canvas){ canvas.drawColor(Color.WHITE); } ..... </code></pre>
 

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