Question

在MyListAdapter类中，我实现了ListAdapter，因此有一些ListAdapter类的方法要覆盖，我得到一个运行时错误，说＆＃34;不能有viewTypeCount＆lt; 1＆＃34;，所以我将getViewTypeCount（）的返回值更改为1（默认情况下为零）。请帮我解决这个问题。

07-25 11:03:20.385: E/AndroidRuntime(1731): FATAL EXCEPTION: main
07-25 11:03:20.385: E/AndroidRuntime(1731): Process: com.rajesh.musicmanager, PID: 1731
07-25 11:03:20.385: E/AndroidRuntime(1731): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rajesh.musicmanager/com.rajesh.musicmanager.MainActivity}: java.lang.IllegalArgumentException: Can't have a viewTypeCount < 1
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.os.Handler.dispatchMessage(Handler.java:102)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.os.Looper.loop(Looper.java:136)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ActivityThread.main(ActivityThread.java:5017)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at java.lang.reflect.Method.invokeNative(Native Method)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at java.lang.reflect.Method.invoke(Method.java:515)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at dalvik.system.NativeStart.main(Native Method)
07-25 11:03:20.385: E/AndroidRuntime(1731): Caused by: java.lang.IllegalArgumentException: Can't have a viewTypeCount < 1
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.widget.AbsListView$RecycleBin.setViewTypeCount(AbsListView.java:6498)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.widget.ListView.setAdapter(ListView.java:486)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ListActivity.setListAdapter(ListActivity.java:265)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at com.rajesh.musicmanager.MainActivity.onCreate(MainActivity.java:12)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.Activity.performCreate(Activity.java:5231)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-25 11:03:20.385: E/AndroidRuntime(1731):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
07-25 11:03:20.385: E/AndroidRuntime(1731):     ... 11 more

MainActivity.Java

package com.rajesh.musicmanager;

import android.app.ListActivity;
import android.os.Bundle;


public class MainActivity extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
         setListAdapter(new MylistAdapter(this));
        super.onCreate(savedInstanceState);
    }   
}

MyListAdapter.java

package com.rajesh.musicmanager;


import android.content.Context;
import android.database.DataSetObserver;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.TextView;

public class MylistAdapter implements ListAdapter {


LayoutInflater layout;
String names[]={"efds","vxcvv","cvfvfdvgr","eriehih","jhfgur"};
String phones[]={"1234","43421","34214","341245","3543254"};

public MylistAdapter(Context context){
     super();
     layout=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

 }

public int getCount() {
    // TODO Auto-generated method stub
    return names.length;
}

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return names[position];
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int getItemViewType(int position) {
        // TODO Auto-generated method stub
        int j=1;
        return j;
    }

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

        if (v==null) {
            v=layout.inflate(R.layout.custom_list, null);   
            Log.e("error", "getview entered");
        }
        TextView txt1 =(TextView) v.findViewById(R.id.tv1);
        TextView txt2 =(TextView) v.findViewById(R.id.tv2);
        txt1.setText(names[position]);
        txt2.setText(phones[position]);

        // TODO Auto-generated method stub
        return v;
    }

    @Override
    public int getViewTypeCount() {
        // TODO Auto-generated method stub

        return 1;
    }

    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isEmpty() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void registerDataSetObserver(DataSetObserver observer) {
        // TODO Auto-generated method stub

    }

    @Override
    public void unregisterDataSetObserver(DataSetObserver observer) {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean areAllItemsEnabled() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isEnabled(int position) {
        // TODO Auto-generated method stub
        return false;
    }
}

Answer 1

在适配器上试试这个：

public int getItemViewType(int position) {
   return 0;
}

希望这有帮助。

Answer 2

使用此：

@Override
public int getViewTypeCount() {
    if(getCount() > 0){
        return getCount();
    }else{
        return super.getViewTypeCount();
    }

}

Answer 3

@Override
public int getViewTypeCount()
{
return 1;
}

在适配器中尝试此操作

Android：使用自定义列表适配器时出错

3 个答案: