我不知道Firebase
也不知道Arduino
....但是我写了这段代码,指的是大卫·伊斯特的视频。所以我得到一个错误,请帮助我解决它。
错误是:
错误:(66, 52) 错误:没有找到适合 FirebaseListAdapter() 构造函数的构造函数 FirebaseListAdapter.FirebaseListAdapter(Activity,Class,int,Firebase) 不适用(实际参数列表和形式参数列表的长度不同)构造函数 FirebaseListAdapter.FirebaseListAdapter(Activity, Class,int,Query) 不适用(实际参数列表和形式参数列表的长度不同)
这是 MainActivity.java 的代码:
package com.example.devashish.sprout;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import com.firebase.client.ChildEventListener;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import com.firebase.client.ValueEventListener;
import com.firebase.ui.FirebaseListAdapter;
import java.util.ArrayList;
import java.util.Map;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
Firebase mRootRef;
ArrayList<String> mMessages= new ArrayList<>();
TextView mTextView;
ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
protected void onStart(){
super.onStart();
mTextView=(TextView)findViewById(R.id.textViewCondition);
mListView=(ListView)findViewById(R.id.listView);
mRootRef = new Firebase("https://pleaserun.firebaseio.com");
Firebase messagesRef=mRootRef.child("condition");
final FirebaseListAdapter<String> adapter= new FirebaseListAdapter<String>() {
@Override
protected void populateView(View view, String s, int i) {
TextView textView=(TextView)view.findViewById(android.R.id.text1);
textView.setText(s);
mListView.setAdapter(adapter);
}
};
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我将您提到的行更改为: final FirebaseListAdapter adapter = new FirebaseListAdapter(this,String.class,android.R.layout.simple_list_item_1,messagesRef)
它现在给出错误:错误:(71、38)错误:变量适配器可能尚未初始化