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POImplementing buttons in GridView
 

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  1. POImplementing buttons in GridView
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    <p>I'm trying to implement a GridView with button. The program shows no errors but the application force closes when I press on a button.Here's my code.</p> <p>Main Code</p> <pre><code>package android.work; import android.app.Activity; import android.os.Bundle; import android.widget.GridView; import android.widget.Toast; public class App2Activity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); GridView grid1=(GridView)findViewById(R.id.gridView1); grid1.setAdapter(new ButtonAdapter(this)); } public void func(int position) { Toast.makeText(this, position, Toast.LENGTH_SHORT).show(); } } </code></pre> <p>Code for Installing buttons in Gridview package android.work;</p> <pre><code>import android.content.Context; import android.graphics.Color; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.GridView; public class ButtonAdapter extends BaseAdapter { public Context mcontext; public ButtonAdapter(Context c) { mcontext=c; } public int getCount() { return filesnames.length; } public Object getItem(int arg0) { return null; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { Button btn; if(convertView==null) { btn=new Button(mcontext); btn.setLayoutParams(new GridView.LayoutParams(100,55)); btn.setPadding(8, 8, 8, 8); } else { btn=(Button)convertView; } btn.setText(filesnames[position]); btn.setTextColor(Color.WHITE); //btn.setBackgroundResource(R.drawable.button_onoff_indicator_off); btn.setId(position); btn.setOnClickListener(new myonclicklistener(position)); return btn; } public String[] filesnames = { "File 1", "File 2", "Roflcopters" }; } </code></pre> <p>OnClickListener Code</p> <pre><code>package android.work; import android.view.View; import android.view.View.OnClickListener; public class myonclicklistener extends App2Activity implements OnClickListener { private final int position; public myonclicklistener(int position) { this.position=position; } public void onClick(View v) { func(position); } } 02-08 03:54:14.026: E/AndroidRuntime(1961): FATAL EXCEPTION: main 02-08 03:54:14.026: E/AndroidRuntime(1961): java.lang.NullPointerException 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.content.ContextWrapper.getResources(ContextWrapper.java:80) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.widget.Toast.makeText(Toast.java:258) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.work.App2Activity.func(App2Activity.java:21) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.work.myonclicklistener.onClick(myonclicklistener.java:16) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.view.View.performClick(View.java:2485) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.view.View$PerformClick.run(View.java:9080) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.os.Handler.handleCallback(Handler.java:587) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.os.Handler.dispatchMessage(Handler.java:92) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.os.Looper.loop(Looper.java:123) 02-08 03:54:14.026: E/AndroidRuntime(1961): at android.app.ActivityThread.main(ActivityThread.java:3683) 02-08 03:54:14.026: E/AndroidRuntime(1961): at java.lang.reflect.Method.invokeNative(Native Method) 02-08 03:54:14.026: E/AndroidRuntime(1961): at java.lang.reflect.Method.invoke(Method.java:507) 02-08 03:54:14.026: E/AndroidRuntime(1961): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 02-08 03:54:14.026: E/AndroidRuntime(1961): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 02-08 03:54:14.026: E/AndroidRuntime(1961): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. PTQuestion
    1. USdaemon54
    1. USdaemon54
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    1. This table or related slice is empty.
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    1. COcan you post the error? we can't help you if we don't know what the exact crash is.
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      1. POImplementing buttons in GridView
      1. USKevin Qiu
    2. COThe program crashes when a button is pressed.I believe the bug is in the OnClickListener Code because when I comment the func(position), there's no application crash.
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      1. POImplementing buttons in GridView
      1. USdaemon54
    3. COi mean can you post the logcat? we need to know what type of error it is (nullpointer, arrayoutofbounds, etc.)
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      1. POImplementing buttons in GridView
      1. USKevin Qiu
 

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