Question

我创建了一个自定义适配器来填充我拥有的项目，具体取决于有多少元素，但它只填充第一项，我无法弄清楚为什么

main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView"
        android:textSize="25sp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <ListView
        android:id="@+id/customList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/textView" />

</RelativeLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

<TextView
    android:id="@+id/item_text_2"
    android:layout_width="116dp"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:text="Default Text 2"
    android:layout_gravity="right"
    android:layout_below="@+id/item_text_1"
    android:layout_centerHorizontal="true" />

<TextView
    android:id="@+id/item_text_1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:text="Default Text 1"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:id="@+id/item_text_3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="15sp"
    android:text="Default Text 3"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="42dp" />

自定义类

public class CustomClass {
    private String txt1, txt2, txt3;
public CustomClass(String txt1, String txt2, String txt3) {
    this.txt1 = txt1;
    this.txt2 = txt2;
    this.txt3 = txt3;
}

public String getTxt1() {
    return txt1;
}

public String getTxt2() {
    return txt2;
}

public String getTxt3() {
    return txt3;
}
}

MainActivity

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private List<CustomClass> lst_stuff = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    populateCustomClass();
    populateListView();
}

private void populateCustomClass()
{
    lst_stuff.add(new CustomClass("First", "I Got", "FIRST!!!!!"));
    lst_stuff.add(new CustomClass("Second", "How did you...", "you know what GG"));
    lst_stuff.add(new CustomClass("Third", "I Got", "Last?!! ... I am just too good to be first"));
}

private void populateListView()
{
    ArrayAdapter<CustomClass> adapter = new CustomAdapter();
    ListView lst = (ListView) findViewById(R.id.customList);
    lst.setAdapter(adapter);
}

private class CustomAdapter extends ArrayAdapter<CustomClass>
{
    public CustomAdapter()
    {
        super(MainActivity.this, R.layout.item, lst_stuff);
    }

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

        if (itemView == null)
            itemView = getLayoutInflater().inflate(R.layout.item, parent, false);

        try 
        {
            CustomClass customClass = lst_stuff.get(position);

            TextView textView_1 = (TextView) findViewById(R.id.item_text_1);
            textView_1.setText(customClass.getTxt1());

            TextView textView_2 = (TextView) findViewById(R.id.item_text_2);
            textView_2.setText(customClass.getTxt2());

            TextView textView_3 = (TextView) findViewById(R.id.item_text_3);
            textView_3.setText(customClass.getTxt3());
        }
        catch (NullPointerException exception)
        {
            Toast.makeText(MainActivity.this, "Exception", Toast.LENGTH_SHORT).show();
            exception.printStackTrace();
        }

        return itemView;
    }
}

@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);
}
}

是否有遗漏或出错的地方？

Answer 1

一切似乎都没问题，但我会改变方法getView（）的内容：

reaver -i mon0 -b F8:7B:7A:69:9F:0F -c <channel> -vv

我认为你必须首先获得inflater的一个实例，然后用你的布局（R.layout.item）来扩展你的视图（rowView）。

祝你好运！

只填充第一个项目的列表

1 个答案: