如何从具有多个元素的Listview中获取字符串

Question

我编写了一个代码来显示电话的通话记录，但我不知道如何在列表视图的位置复制电话的字符串。我的“ CallLogAdapter”类可帮助我整理数据并管理呼叫日志。

在我的“ LlamadasRecientes”类中，我尝试在ListView的当前位置调用字符串，但是当我尝试运行它时，它崩溃了。我该怎么办才能获取电话的字符串？

CallLogAdapter.java：

 package com.tecmilenio.natura;

import android.content.Context;
import android.database.Cursor;
import android.provider.CallLog;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.TextView;

import java.util.Date;

public class CallLogAdapter extends CursorAdapter
{

    public CallLogAdapter(Context context, Cursor c)
    {
        super(context, c,true);
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent)
    {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.config,parent,false);
        return view;
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor)
    {
        TextView textView = (TextView) view.findViewById(R.id.Numero);
        TextView textView2 = (TextView) view.findViewById(R.id.fecha);
        String numberString = cursor.getString(cursor.getColumnIndex(CallLog.Calls.NUMBER));
        String nameString = cursor.getString(cursor.getColumnIndex(CallLog.Calls.CACHED_NAME));
        String dateString = cursor.getString(cursor.getColumnIndex(CallLog.Calls.DATE));
        Date calldate = new Date(Long.valueOf(dateString));

            if(nameString == null)
            {
                textView.setText(numberString);
            }
            else
            {
                textView2.setText(calldate.toString());
            }



    }
}

LlamadasRecientes.java

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.CallLog;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class LlamadasRecientes extends AppCompatActivity {

    final private int REQUEST_CODE_ASK_PERMISSIONS = 123;
    private Button btnContactos;
    CallLogAdapter callLogAdapter;
    ListView listView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_llamadas_recientes);

        btnContactos = (Button) findViewById(R.id.Contactos);
        listView = (ListView) findViewById(R.id.list1);

        int hasPermission =  checkSelfPermission(Manifest.permission.READ_CALL_LOG);
        if (hasPermission!= PackageManager.PERMISSION_GRANTED)
        {
            requestPermissions(new String[] {Manifest.permission.READ_CALL_LOG},REQUEST_CODE_ASK_PERMISSIONS);
            return;
        }

        Cursor cursor = getContentResolver().query(CallLog.Calls.CONTENT_URI, null, null, null, CallLog.Calls.DATE + " DESC");
        cursor.moveToFirst();
        callLogAdapter = new CallLogAdapter(LlamadasRecientes.this,cursor);
        listView.setAdapter(callLogAdapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
               final String test= (String) parent.getItemAtPosition(position);
               Toast.makeText(LlamadasRecientes.this,test,Toast.LENGTH_SHORT).show();
            }
        });

Answer 1

请发布您的崩溃日志，您可以通过在Windows上按Alt+6来查看它在您发布崩溃日志后，我将更新我的答案并尝试提供帮助