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POAndroid ComponentInfo RuntimeException and NullPointerException
 

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  1. POAndroid ComponentInfo RuntimeException and NullPointerException
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    <p>This is doing my head in, and it's probably something simple that's causing it - so I think I need a new set of eyes looking at it.</p> <p>All activities are defined in the manifest. I've made sure all attributes are initialised in onCreate/constructor.</p> <p>The 'Circle' object is just a generic object with gets and sets for x, y, radius and colour.</p> <p>Any help greatly appreciated.</p> <pre><code>10-01 16:06:28.338: E/AndroidRuntime(18306): FATAL EXCEPTION: main 10-01 16:06:28.338: E/AndroidRuntime(18306): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dbk.parallelreaction/com.dbk.parallelreaction.GameActivity}: java.lang.NullPointerException 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2308) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.ActivityThread.access$600(ActivityThread.java:153) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.os.Handler.dispatchMessage(Handler.java:99) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.os.Looper.loop(Looper.java:137) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.ActivityThread.main(ActivityThread.java:5227) 10-01 16:06:28.338: E/AndroidRuntime(18306): at java.lang.reflect.Method.invokeNative(Native Method) 10-01 16:06:28.338: E/AndroidRuntime(18306): at java.lang.reflect.Method.invoke(Method.java:511) 10-01 16:06:28.338: E/AndroidRuntime(18306): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) 10-01 16:06:28.338: E/AndroidRuntime(18306): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 10-01 16:06:28.338: E/AndroidRuntime(18306): at dalvik.system.NativeStart.main(Native Method) 10-01 16:06:28.338: E/AndroidRuntime(18306): Caused by: java.lang.NullPointerException 10-01 16:06:28.338: E/AndroidRuntime(18306): at com.dbk.parallelreaction.util.GameView.&lt;init&gt;(GameView.java:51) 10-01 16:06:28.338: E/AndroidRuntime(18306): at com.dbk.parallelreaction.GameActivity.onCreate(GameActivity.java:64) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.Activity.performCreate(Activity.java:5104) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 10-01 16:06:28.338: E/AndroidRuntime(18306): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2262) </code></pre> <p>The two files in question:</p> <p>GameActivity.java</p> <pre><code>package com.dbk.parallelreaction; import android.app.Activity; import android.content.Intent; import android.graphics.Color; import android.graphics.Typeface; import android.os.Bundle; import android.os.CountDownTimer; import android.widget.FrameLayout; import android.widget.ProgressBar; import android.widget.TextView; import com.dbk.parallelreaction.util.GameView; public class GameActivity extends Activity { // GameView object to hold current level private GameView game; // level/score persistance private int currentLevel; private int currentScore; // game countdown timer private CountDownTimer timer; private int timerTime; // in milliseconds private int timerPeriod; // in ms also private int timerIndex; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_game); // initialise timerTime = 10000; timerPeriod = 50; timerIndex = (int) timerTime / timerPeriod; // aesthetic stuff TextView ins = (TextView) findViewById(R.id.GameInstructions); Typeface tf = Typeface.createFromAsset(getAssets(), "Economica-Regular.ttf"); ins.setTypeface(tf); ins.setTextColor(Color.WHITE); ins.setTextSize(18); // get extras Bundle extras = getIntent().getExtras(); currentLevel = extras.getInt("LEVEL"); currentScore = extras.getInt("SCORE"); // check if starting new game, or going to next level switch(currentLevel) { case 1: // new level break; case 2: // etc break; } // add the game view to the layout FrameLayout frame = (FrameLayout) findViewById(R.id.GameContainer); game = new GameView(this, 2); frame.addView(game); // timer bar final ProgressBar pb = (ProgressBar) findViewById(R.id.GameTimerBar); pb.setMax(timerIndex); pb.setProgress(timerIndex); timer = new CountDownTimer(timerTime, timerPeriod) { @Override public void onFinish() { pb.setProgress(timerIndex); Bundle extras = new Bundle(); extras.putInt("SCORE", 16); // placeholder score Intent i = new Intent(getApplicationContext(), GameOverActivity.class); i.putExtras(extras); // GAME OVER if timer bar empties finish(); startActivity(i); } @Override public void onTick(long msLeft) { timerIndex--; pb.setProgress(timerIndex); } }.start(); } // cancel timer if user exits game public void onBackPressed() { super.onBackPressed(); timer.cancel(); } } </code></pre> <p>GameView.java <strong>updated</strong></p> <pre><code>package com.dbk.parallelreaction.util; import java.util.ArrayList; import java.util.Random; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.SurfaceView; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import com.dbk.parallelreaction.R; public class GameView extends SurfaceView { // Temp ArrayList containing Circle objects private ArrayList&lt;Circle&gt; circles; // Paint object for colour info private Paint paint; // number of circles to draw depending on level private int numCircles; // Current score in the current level private int levelScore; public GameView(Context context, int numberCircles) { super(context); LayoutInflater inflater =(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); // replace custom_layout with the name of the .xml file that contains the `FrameLayout` with id R.id.GameContainer View v = inflater.inflate(R.layout.activity_game, (ViewGroup) GameView.this.getParent(), true); FrameLayout frame = (FrameLayout) v.findViewById(R.id.GameContainer); // initialise circles = new ArrayList&lt;Circle&gt;(); paint = new Paint(); levelScore = 0; numCircles = numberCircles; // Get the game container FrameView int frameW = frame.getWidth(); int frameH = frame.getHeight(); int frameL = frame.getLeft(); int frameT = frame.getTop(); // fill arraylist with random circles Random random = new Random(); for(int i=0; i&lt;numCircles; i++) { // generate coords within the frame int x = random.nextInt((frameL+frameW)-frameL) + frameL; int y = random.nextInt((frameT+frameH)-frameT) + frameT; // random radius between 50 and 10 int r = random.nextInt(50-10) + 10; // add them to the ArrayList circles.add(new Circle(x, y, r, Color.WHITE)); } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); for(int i=0; i&lt;numCircles; i++) { Circle c = circles.get(i); // set colour paint.setColor(c.getColor()); // draw circle to canvas canvas.drawCircle(c.getX(), c.getY(), c.getRadius(), paint); } } } </code></pre>
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    2. CO`int frameW = frame.getWidth();` and line 64 of GameActivity is `game = new GameView(this, 2);`
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