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POAndroid: Dynamically Constructing Views Through A Managing Class Error
 

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  1. POAndroid: Dynamically Constructing Views Through A Managing Class Error
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    <p>Okay so this is what's going on in my Activity, fig 1---- It's iterate string array and creates buttons. chipContainer is a class (ChipMamma, shown below, fig 2), with an associated ViewGroup where chips are populated as buttons. That ChipMamma class is supposed to "manage" chips. The two commented-out lines were a previous implementation- with no ChipMamma, just the main activity managing the chips and populating buttons itself (which works). chipButton is a really simple extension of Button (also shown below, fig 3).</p> <p><strong>FIGURE 1</strong></p> <pre><code> String[] chipAr = {"one","two","three","four", "five","six","seven","eight", "nine","tententententententententententen","eleven","twelve"}; int count = chipAr.length; for (int i = 0; i &lt; count; i = i+1){ chipContainer.newButton(chipAr[i]); //chipButton newButton = new chipButton(this, chipAr[i], i+1); //((FlowLayout) findViewById(R.id.chipContainer)).addView(newButton); } </code></pre> <p>When I use this class as a middle man, everything goes to poop. This is what I can't figure out. And the debug tells me that it can't find the source but I have the source SDK installed...</p> <p><strong>Figure 2</strong></p> <pre><code>public class ChipMamma{ //This was first named "Chip Container" private Context context; private ArrayList&lt;chipButton&gt; chips; private ViewGroup vgContainer; private int count = 0; public ChipMamma(Context context, ViewGroup container){ this.context = context; this.vgContainer = container; } public void newButton(String chip){ ChipButton b = new ChipButton(this, this.context, chip, count+1); chips.add(b); //This could be problematic if you delete a count vgContainer.addView(chips.get(count+1)); count += 1; } </code></pre> <p>This is a chip button class. It's constructor just sets the basic layout params of each chip button (which I would like to move to XML eventually). Basically the debugger gets to the end of the constructor and then gives me the error (even if I remove the last lines, I still get the same error. In fact, the only way I avoid the error is by removing all of the function calls in ChipMamma.newButton).</p> <p><strong>Figure 3</strong></p> <pre><code>public class ChipButton extends Button { final ChipMamma myMamma; private Context context; public ChipButton(ChipMamma theMamma, Context context, String chip, int id) { super(context); this.context = context; this.myMamma = theMamma; this.setId(id); //I've added extra indentation to paramater settings this.setPadding(10, 3, 10, 4); //needs to be XML //wiggleButton(); this.setText(chip); if (android.os.Build.VERSION.SDK_INT &gt;= android.os.Build.VERSION_CODES.JELLY_BEAN){ this.setBackground(this.getResources().getDrawable(R.drawable.button)); } else{ this.setBackgroundDrawable(this.getResources().getDrawable(R.drawable.button)); } LayoutParams params = new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); ((Button)this).setLayoutParams(params); } </code></pre> <p>Why can't I add these buttons from inside ChipMamma?</p> <pre><code>12-01 16:07:58.716: E/AndroidRuntime(6019): FATAL EXCEPTION: main 12-01 16:07:58.716: E/AndroidRuntime(6019): java.lang.RuntimeException: Unable to start activity ComponentInfo{nosite.spendstat/nosite.spendstat.Input}: java.lang.NullPointerException 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1696) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1716) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.ActivityThread.access$1500(ActivityThread.java:124) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:968) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.os.Handler.dispatchMessage(Handler.java:99) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.os.Looper.loop(Looper.java:130) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.ActivityThread.main(ActivityThread.java:3806) 12-01 16:07:58.716: E/AndroidRuntime(6019): at java.lang.reflect.Method.invokeNative(Native Method) 12-01 16:07:58.716: E/AndroidRuntime(6019): at java.lang.reflect.Method.invoke(Method.java:507) 12-01 16:07:58.716: E/AndroidRuntime(6019): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-01 16:07:58.716: E/AndroidRuntime(6019): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-01 16:07:58.716: E/AndroidRuntime(6019): at dalvik.system.NativeStart.main(Native Method) 12-01 16:07:58.716: E/AndroidRuntime(6019): Caused by: java.lang.NullPointerException 12-01 16:07:58.716: E/AndroidRuntime(6019): at nosite.spendstat.ChipMamma.newButton(chipMamma.java:32) 12-01 16:07:58.716: E/AndroidRuntime(6019): at nosite.spendstat.Input.onCreate(Input.java:212) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 12-01 16:07:58.716: E/AndroidRuntime(6019): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1660) 12-01 16:07:58.716: E/AndroidRuntime(6019): ... 11 more </code></pre>
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    1. USmy name is aj
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