编译工程时，遇到“Cyclic inheritance involving”，翻译过来就是，

实际代码：

package itbird.com.myapplication33;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;import java.util.ArrayList;/** * MainActivity * @author itbird */public class MainActivity extends AppCompatActivity implements MainActivity.ListViewButtonClickListener {    @Override    protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView listView = (ListView) findViewById(R.id.listview); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {     @Override     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {  Toast.makeText(MainActivity.this, "listview item click position = " + position, Toast.LENGTH_SHORT).show();     } }); listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {     @Override     public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {  Toast.makeText(MainActivity.this, "listview item long click position = " + position, Toast.LENGTH_SHORT).show();  return true;     } }); ArrayList<String> data = new ArrayList<String>(); data.add("test1"); data.add("test2"); data.add("test3"); ListViewAdapter adapter = new ListViewAdapter(this, data); adapter.setOnButtonClickListener(this); listView.setAdapter(adapter);    }    public interface ListViewButtonClickListener { void onClick(int position);    }    @Override    public void onClick(int position) { Toast.makeText(MainActivity.this, "listview item button long click position = " + position, Toast.LENGTH_SHORT).show();    }}

错误原因：

循坏继承在java中是不允许的，不仅仅局限于接口，类也不能循环继承。因为编译的时候，编译器不知道该先编译哪个。比如你的这个例子，编译class MainActivity的时候需要先编译MainActivity.ListViewButtonClickListener，但是MainActivity.ListViewButtonClickListener又是class MainActivity的内部接口

解决方法：

只要把接口ListViewButtonClickListener移动到另外的文件中就不会有这样的问题了

package itbird.com.myapplication33;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;import java.util.ArrayList;/** * MainActivity * @author itbird */public class MainActivity extends AppCompatActivity implements ListViewAdapter.ListViewButtonClickListener {    @Override    protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView listView = (ListView) findViewById(R.id.listview); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {     @Override     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {  Toast.makeText(MainActivity.this, "listview item click position = " + position, Toast.LENGTH_SHORT).show();     } }); listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {     @Override     public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {  Toast.makeText(MainActivity.this, "listview item long click position = " + position, Toast.LENGTH_SHORT).show();  return true;     } }); ArrayList<String> data = new ArrayList<String>(); data.add("test1"); data.add("test2"); data.add("test3"); ListViewAdapter adapter = new ListViewAdapter(this, data); adapter.setOnButtonClickListener(this); listView.setAdapter(adapter);    }    @Override    public void onClick(int position) { Toast.makeText(MainActivity.this, "listview item button long click position = " + position, Toast.LENGTH_SHORT).show();    }}

package itbird.com.myapplication33;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.TextView;import java.util.ArrayList;/** * ListViewAdapter * Created by itbird on 2018/8/3. */public class ListViewAdapter extends BaseAdapter {    private Context mContext;    private ArrayList<String> mList;    private LayoutInflater mInflater;    private ListViewButtonClickListener mListener;    public ListViewAdapter(Context context, ArrayList<String> stringList) { mContext = context; mList = stringList; mInflater = LayoutInflater.from(mContext);    }    public void setOnButtonClickListener(ListViewButtonClickListener listener) { mListener = listener;    }    @Override    public int getCount() { if (mList == null) {     return 0; } return mList.size();    }    @Override    public Object getItem(int position) { if (mList == null) {     return null; } return mList.get(position);    }    @Override    public long getItemId(int position) { return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) {     // 下拉项布局     convertView = mInflater.inflate(R.layout.list_item_btn, null);     holder = new ViewHolder();     holder.title = (TextView) convertView.findViewById(R.id.title);     holder.btn = (Button) convertView.findViewById(R.id.btn);     convertView.setTag(holder); } else {     holder = (ViewHolder) convertView.getTag(); } holder.title.setText(mList.get(position)); // 通常将position设置为tag，方便之后判断点击的button是哪一个 holder.btn.setTag(position); holder.btn.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {  if (mListener != null) {      mListener.onClick(position);  }     } }); return convertView;    }    public interface ListViewButtonClickListener { void onClick(int position);    }    class ViewHolder { TextView title; Button btn;    }}