排除NullPointerException

2018-06-05 05:17:06

我正在使用volley.jar编译时没有错误，但有运行时异常。

并添加volley.jar并添加构建路径。什么是问题？

java.lang.NullPointerException at com.android.volley.toolbox.NetworkImageView.loadImageIfNecessary（NetworkImageView.java:150）at com.android.volley.toolbox.NetworkImageView.onLayout（NetworkImageView.java:199）at android.view.View。在android.widget.LinearLayout.onLayout（LinearLayout.java:1671）上的android.widget.LinearLayout.setChildFrame（LinearLayout.java:1682）的布局（View.java:14898）：1447）at android.view.View.layout（View.java:14898）at android.view.ViewGroup.layout（ViewGroup.java:4676）at android.widget.ListView.setupChild（ListView.java:1894）at android .widget.ListView.makeAndAddView（ListView.java:1805）at android.widget.ListView.fillDown（ListView.java:698）at android.widget.ListView.fillFromTop（ListView.java:759）at android.widget.ListView。 layout.Children（ListView.java:1637）at android.widget.AbsListView.onLayout（AbsListView.java:2144）at android.view.View.layout（View.java:14898）at android.view.ViewGroup.layout（ViewGro android.widget.LinearLayout.setLineout.java:1445（android.widget.Lineout.java:1682）android.widget.LinearLayout.layoutVertical（LinearLayout.java:1536）android.widget.LinearLayout.onLayout（LinearLayout.java:1445））在android.widget上的android.widget.FrameLayout.layoutChildren（FrameLayout.java:453）上的android.view.ViewGroup.layout（ViewGroup.java:4676）上的android.view.View.layout（View.java:14898） .framework.ayout.onLayout（FrameLayout.java:388）at android.view.View.layout（View.java:14898）at android.view.ViewGroup.layout（ViewGroup.java:4676）at android.widget.FrameLayout.layoutChildren（（android.view.java:14898）android.view.ViewGroup.layout（ViewGroup.java:4676）在android.widget.FrameLayout.onLayout（FrameLayout.java:388）上的FrameLayout.java:453））在android.view.View.Group.layout（ViewGroup.java:4676）处的android.view.View.layout（View.java:14898）处的android.support.v4.view.ViewPager.onLayout（ViewPager.java:1594）在android.widget.RelativeLayout.onLayout（RelativeLayout.java:10 55）android.view.View.layout（View.java:14898）在android.view.ViewGroup.layout（ViewGroup.java:4676）android.widget.FrameLayout.layoutChildren（FrameLayout.java:453）在android。 widget.FrameLayout.onLayout（FrameLayout.java:388）at android.view.View.layout（View.java:14898）at android.view.ViewGroup.layout（ViewGroup.java:4676）at com.android.internal.widget .ActionBarOverlayLayout.onLayout（ActionBarOverlayLayout.java:374）at android.view.View.layout（View.java:14898）at android.view.ViewGroup.layout（ViewGroup.java:4676）at android.widget.FrameLayout.layoutChildren（（android.view.java:14898）android.view.ViewGroup.layout（ViewGroup.java:4676）在android.widget.FrameLayout.onLayout（FrameLayout.java:388）上的FrameLayout.java:453））at android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2014）at android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1771）at android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1013）at android.view .ViewRootImpl $ TraversalRunnabl e.run（ViewRootImpl.java:5746）at android.view.Choreographer $ CallbackRecord.run（Choreographer.java:761）at android.view.Choreographer.doCallbacks（Choreographer.java:574）at android.view.Choreographer.doFrame （Choreographer.java:544）at android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:747）at android.os.Handler.handleCallback（Handler.java:733）at android.os.Handler.dispatchMessage（Handler。 java：95）在android.os.Looper.loop（Looper.java:136）在android.app.ActivityThread.main（ActivityThread.java:5068）在java.lang.reflect.Method.invokeNative（本地方法）在java 。com.android.internal.os.ZygoteInit.main（ZygoteInit）上的com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:792）.lang.reflect.Method.invoke（Method.java:515） .java：608）at dalvik.system.NativeStart.main（Native Method）

CustomAdapter.java

public class CustomAdapter extends BaseAdapter {

Context context;
List<Games> rowItems;

public CustomAdapter(Context context, List<Games> rowItems) {
    this.context = context;
    this.rowItems = rowItems;
}

@Override
public int getCount() {
    return rowItems.size();
}

@Override
public Object getItem(int position) {
    return rowItems.get(position);
}

@Override
public long getItemId(int position) {
    return rowItems.indexOf(getItem(position));
}

/* private view holder class */
private class ViewHolder {
    NetworkImageView profile_pic;
    TextView member_name;
    TextView status;
    TextView contactType;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder = null;

    LayoutInflater mInflater = (LayoutInflater) context
            .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_item, null);
        holder = new ViewHolder();

        holder.member_name = (TextView) convertView
                .findViewById(R.id.member_name);
        holder.profile_pic = (NetworkImageView) convertView
                .findViewById(R.id.profile_pic);
        holder.status = (TextView) convertView.findViewById(R.id.status);
        holder.contactType = (TextView) convertView
                .findViewById(R.id.contact_type);

        Games row_pos = rowItems.get(position);

        ImageLoader il = VolleySingleton.getInstance().getImageLoader();

        holder.profile_pic.setImageUrl(IMAGE_URL ,il);


        holder.member_name.setText(row_pos.getChampionId());
        holder.status.setText(row_pos.getGameMode());
        holder.contactType.setText(row_pos.getStats().getItem0());
        Log.d("aaa", "position : " + position );
        Log.d("aaa", "row_pos.getChampionId()" + row_pos.getChampionId());
        Log.d("aaa", "row_pos.getGameMode()" + row_pos.getGameMode());
        Log.d("aaa", "row_pos.getStats().getItem0()" + row_pos.getStats().getItem0());

        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
        Games row_pos = rowItems.get(position);

        ImageLoader il = VolleySingleton.getInstance().getImageLoader();
        holder.profile_pic.setImageUrl(IMAGE_URL,il);

        holder.member_name.setText(row_pos.getChampionId());
        holder.status.setText(row_pos.getGameMode());
        holder.contactType.setText(row_pos.getStats().getItem0());
        Log.d("aaa", "position : " + position );
        Log.d("aaa", "row_pos.getChampionId()" + row_pos.getChampionId());
        Log.d("aaa", "row_pos.getGameMode()" + row_pos.getGameMode());
        Log.d("aaa", "row_pos.getStats().getItem0()" + row_pos.getStats().getItem0());

    }

    return convertView;
}

}

list_item.xml

的LinearLayout

<com.android.volley.toolbox.NetworkImageView
    android:id="@+id/profile_pic"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:contentDescription="desc"
    android:paddingLeft="10dp"
    android:paddingRight="10dp" />

<TextView
    android:id="@+id/member_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:layout_toRightOf="@+id/profile_pic"
    android:paddingBottom="10dp"
    android:text="txt"
    android:textSize="20sp" />

<TextView
    android:id="@+id/status"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/member_name"
    android:layout_below="@+id/member_name"
    android:text="txt"
    android:textSize="16sp" />

<TextView
    android:id="@+id/contact_type"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/member_name"
    android:layout_alignBottom="@+id/member_name"
    android:layout_alignParentRight="true"
    android:text="txt" />

我解决了这个问题。这段代码运行良好，在我的volleysingleton类getImageLoader方法中有一些错误。

链接地址: http://www.djcxy.com/p/16635.html

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