0
我正在关注使用gridview的一个很好的教程。我一直无法让代码工作,但我一直编译并运行app force关闭。 Logcat称其“无法实例化活动CompnentInfo”等于一系列其他错误。我不想调试,所以我陷入了僵局。这是我的代码:Android:Gridview部队关闭
public class GridViewDemo extends Activity {
public String[] filenames = {
"File 1",
"File 2",
"Roflcopters"
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ButtonAdapter(this));
}
//Classes
public class ButtonAdapter extends BaseAdapter {
private Context mContext;
// Gets the context so it can be used later
public ButtonAdapter(Context c) {
mContext = c;
}
// Total number of things contained within the adapter
public int getCount() {
return filenames.length;
}
// Require for structure, not really used in my code.
public Object getItem(int position) {
return null;
}
// Require for structure, not really used in my code. Can
// be used to get the id of an item in the adapter for
// manual control.
public long getItemId(int position) {
return position;
}
@SuppressWarnings("null")
public View getView(int position,
View convertView, ViewGroup parent) {
Button btn = null;
btn.setOnClickListener(new MyOnClickListener(position));
if (convertView == null) {
// if it's not recycled, initialize some attributes
btn = new Button(mContext);
btn.setLayoutParams(new GridView.LayoutParams(100, 55));
btn.setPadding(8, 8, 8, 8);
}
else {
btn = (Button) convertView;
}
btn.setText(filenames[position]);
// filenames is an array of strings
btn.setTextColor(Color.WHITE);
btn.setBackgroundResource(R.drawable.icon);
btn.setId(position);
return btn;
}
}
class MyOnClickListener implements OnClickListener {
private final int position;
public MyOnClickListener(int position) {
this.position = position;
}
public void onClick(View v) {
// Preform a function based on the position
// someFunction(this.position)
Toast.makeText(getApplicationContext(), this.position, Toast.LENGTH_SHORT).show();
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>
清单XML:
<?xml version="1.0" encoding="utf-8"?>
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".GridviewActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
任何想法为什么这崩溃? 这是logcat的输出:
感谢调试教程,我一直在寻找一个确切的事情,并且它带有一个视频太开机,哈哈。至于代码我解决了你提到的问题,我清楚地知道为什么我在那个部分出现错误。修复它然后程序仍然崩溃,所以我必须有更多的坏编码的地方。 – Nick
所以请添加一个logcat日志,以便我们可以看到异常详细信息。 – MByD
见上面的编辑,再次感谢您的帮助。 – Nick