得到了threadid = 1:线程在列表视图上以未捕获的异常(group = 0x41088930)退出 [英] Got threadid=1: thread exiting with uncaught exception (group=0x41088930) on listview

问题描述

我正在制作一个在列表视图上显示正在运行的应用程序图标的应用程序. (我认为)没有语法问题，但是当我启动应用程序并尝试运行活动时， 应用程序强制关闭并且出现threadid=1: thread exiting with uncaught exception (group=0x41088930)和更多错误我该如何解决此错误?我应该使用Asynctask将图片加载到列表视图吗?或任何解决方案?

i'm making an app that shows running apps icon on listview. there are no syntax problem (i think) but when i launch app and try to run activity, the app force closes and i got threadid=1: thread exiting with uncaught exception (group=0x41088930)and more error how can i fix this error? should i use Asynctask to load image to list view? or any solutions?

(Logcat)

02-18 14:17:46.700: W/dalvikvm(18370): threadid=1: thread exiting with uncaught exception (group=0x41088930)
02-18 14:17:46.700: E/AndroidRuntime(18370): FATAL EXCEPTION: main
02-18 14:17:46.700: E/AndroidRuntime(18370): java.lang.RuntimeException: Unable to start activity ComponentInfo{kr.hybdms.sidepanel/kr.hybdms.sidepanel.LeftSidePanel}: java.lang.NullPointerException
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2309)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2359)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.ActivityThread.access$600(ActivityThread.java:153)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.os.Looper.loop(Looper.java:137)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.ActivityThread.main(ActivityThread.java:5204)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at java.lang.reflect.Method.invokeNative(Native Method)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at java.lang.reflect.Method.invoke(Method.java:511)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at dalvik.system.NativeStart.main(Native Method)
02-18 14:17:46.700: E/AndroidRuntime(18370): Caused by: java.lang.NullPointerException
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.widget.ListView.setAdapter(ListView.java:462)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at kr.hybdms.sidepanel.LeftSidePanel.onCreate(LeftSidePanel.java:59)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.Activity.performCreate(Activity.java:5108)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
02-18 14:17:46.700: E/AndroidRuntime(18370):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2263)
02-18 14:17:46.700: E/AndroidRuntime(18370):    ... 11 more

---

(LeftSidePanel.java)

package kr.hybdms.sidepanel;


import java.util.ArrayList;
import java.util.List;


import kr.hybdms.sidepanel.PanelArrayAdapter;
import kr.hybdms.sidepanel.R;

import kr.hybdms.sidepanel.util.SystemUiHider;


import android.app.Activity;
import android.app.ActivityManager;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

/**
 * An example full-screen activity that shows and hides the system UI (i.e.
 * status bar and navigation/system bar) with user interaction.
 * 
 * @see SystemUiHider
 */
public class LeftSidePanel extends Activity implements
OnItemClickListener {
ListView listView;
List<PanelItemDetail> rowItems;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_left_side_panel);

ActivityManager am = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(10);
ArrayList<PanelItemDetail> iconarray = new ArrayList<PanelItemDetail>();
PackageManager pacMgr = getPackageManager();
  for (ActivityManager.RunningTaskInfo runningTask: tasks)
  {
    try {
        iconarray.add(new PanelItemDetail(pacMgr.getApplicationIcon(runningTask.topActivity.getPackageName())));
    } catch (NameNotFoundException e) {
      e.printStackTrace();
    }
  }

listView = (ListView) findViewById(R.id.panelcontents);
PanelArrayAdapter adapter = new PanelArrayAdapter(this,
        R.layout.panelrow, rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
Toast toast = Toast.makeText(getApplicationContext(),
    "Item " + (position + 1) + ": " + rowItems.get(position),
    Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}

---

(PanelArrayAdapter.java)

package kr.hybdms.sidepanel;

import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;

public class PanelArrayAdapter extends ArrayAdapter<PanelItemDetail> {
    Context context;
    public PanelArrayAdapter(Context context, int resourceId,
            List<PanelItemDetail> items) {
        super(context, resourceId, items);
        this.context = context;
    }
    /*private view holder class*/
    private class ViewHolder {
        ImageView imageView;
    }
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        PanelItemDetail rowItem = getItem(position);
        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.panelrow, null);
            holder = new ViewHolder();
            holder.imageView = (ImageView) convertView.findViewById(R.id.appicon);
            convertView.setTag(holder);
        } else
            holder = (ViewHolder) convertView.getTag();
        holder.imageView.setImageDrawable(rowItem.getImageId());
        return convertView;
    }
}

---

(PanelItemDetail.java)

package kr.hybdms.sidepanel;

import android.graphics.drawable.Drawable;

public class PanelItemDetail {
    private Drawable imageId;
    public PanelItemDetail(Drawable images) {
        this.imageId = images;
    }
    public Drawable getImageId() {
        return imageId;
    }
    public void setImageId(Drawable imageId) {
        this.imageId = imageId;
    }
}

推荐答案

错误在这里

PanelArrayAdapter adapter = new PanelArrayAdapter(this,
        R.layout.panelrow, rowItems);
listView.setAdapter(adapter);

因为rowItems尚未初始化.

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