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06-14 09:33:00.830: E/AndroidRuntime(736): FATAL EXCEPTION: main
06-14 09:33:00.830: E/AndroidRuntime(736): java.lang.RuntimeException: Unable to start activity ComponentInfo{napo.news.activity/napo.news.activity.WenpingNewsActivity}: java.lang.NullPointerException
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.os.Handler.dispatchMessage(Handler.java:99)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.os.Looper.loop(Looper.java:123)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.ActivityThread.main(ActivityThread.java:4627)
06-14 09:33:00.830: E/AndroidRuntime(736): at java.lang.reflect.Method.invokeNative(Native Method)
06-14 09:33:00.830: E/AndroidRuntime(736): at java.lang.reflect.Method.invoke(Method.java:521)
06-14 09:33:00.830: E/AndroidRuntime(736): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-14 09:33:00.830: E/AndroidRuntime(736): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-14 09:33:00.830: E/AndroidRuntime(736): at dalvik.system.NativeStart.main(Native Method)
06-14 09:33:00.830: E/AndroidRuntime(736): Caused by: java.lang.NullPointerException
06-14 09:33:00.830: E/AndroidRuntime(736): at napo.news.activity.WenpingNewsActivity.onCreate(WenpingNewsActivity.java:55)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-14 09:33:00.830: E/AndroidRuntime(736): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-14 09:33:00.830: E/AndroidRuntime(736): ... 11 more
package napo.news.activity;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import napo.news.util.DensityUtil;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.ViewGroup.LayoutParams;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.SimpleAdapter;
public class WenpingNewsActivity extends Activity {
private final int COLUMNWIDTHPX = 55;
private int mColumnWidthDip;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mColumnWidthDip = DensityUtil.px2dip(this, COLUMNWIDTHPX);
String[] categoryArray = getResources().getStringArray(
R.array.categories);
List<HashMap<String, String>> categories = new ArrayList<HashMap<String, String>>();
for (int i=0; i < categoryArray.length; i++) {
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("category_title", categoryArray[i]);
categories.add(hashMap);
}
SimpleAdapter categoryAdapter = new SimpleAdapter(this, categories, R.layout.category_title, new String[]{"category_title"}, new int[] {R.id.category_title});
GridView category = new GridView(this);
category.setColumnWidth(mColumnWidthDip);
category.setNumColumns(GridView.AUTO_FIT);
category.setGravity(Gravity.CENTER);
int width = mColumnWidthDip * categories.size();
LayoutParams params = new LayoutParams(width,
LayoutParams.WRAP_CONTENT);
category.setLayoutParams(params);
category.setAdapter(categoryAdapter);
LinearLayout categoryList = (LinearLayout)findViewById(R.id.catgory_layout);
categoryList.addView(category);
}
}
06-14 09:33:00.830: E/AndroidRuntime(736): Caused by: java.lang.NullPointerException
06-14 09:33:00.830: E/AndroidRuntime(736): at napo.news.activity.WenpingNewsActivity.onCreate(WenpingNewsActivity.java:55)