如何在自定义ListView项目中更改图像-Android

Question

我们正在尝试从自定义ListView项更改图像。 我们已经尝试了一切，直到该项目不再编译为止。 我们从头开始，直到要点按ListView项时将图像src从ListView项设置为其他内容。

这是我们的整个代码：

package com.example.namename.listview;

import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;


public class MainActivity extends Activity {

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

        String[] foods = {"Bacon","Ham","Tuna","Candy","Meatball","Potato"};
        ListAdapter buckysAdapter = new CustomAdapter(this, foods);
        ListView buckysListView = (ListView) findViewById(R.id.buckysListView);
        buckysListView.setAdapter(buckysAdapter);

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

    }
}


package com.example.namename.listview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class CustomAdapter extends ArrayAdapter<String> {

    public CustomAdapter (Context context, String[] foods) {
        super(context, R.layout.custom_row, foods);
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater buckysInflater = LayoutInflater.from(getContext());
        View customView = buckysInflater.inflate(R.layout.custom_row, parent, false);

        String singleFoodItem = getItem(position);
        TextView buckysText = (TextView) customView.findViewById(R.id.buckysText);
        ImageView buckysImage = (ImageView) customView.findViewById(R.id.buckysImage);

        buckysText.setText(singleFoodItem);
        buckysImage.setImageResource(R.drawable.deselected);
        return customView;
    }
}


-------------------------------------------------


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/custom_row">

    <ImageView
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:id="@+id/buckysImage"
        android:src="@drawable/deselected"
        android:layout_margin="5dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/buckysText"
        android:layout_margin="5dp" />
</LinearLayout>




<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">

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/buckysListView"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

Answer 1

想要在轻按ListView项目时将图像src从ListView项目设置为其他内容

使用onItemClick方法的view参数更改所选行的ImageView ：

 @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
   ImageView selectedImage = (ImageView) view.findViewById(R.id.buckysImage);    
   selectedImage.setImageResource(R.drawable.selected);                 
   }

Answer 2

您可以编写customView Click侦听器方法，然后在点按ListView项时可以根据需要更改图像。

customView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                       buckysImage.setImageResource("Your Image Resource");
            }
        });

Answer 3

    public View getView(int position, View convertView, ViewGroup parent) {

    LayoutInflater buckysInflater = LayoutInflater.from(getContext());
    View customView = buckysInflater.inflate(R.layout.custom_row, parent, false);

    String singleFoodItem = getItem(position);
    TextView buckysText = (TextView) customView.findViewById(R.id.buckysText);
    ImageView buckysImage = (ImageView) customView.findViewById(R.id.buckysImage);

    buckysText.setText(singleFoodItem);
    buckysImage.setImageResource(R.drawable.deselected);

    // set a listener to buckysImage
    buckysImage.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {

            buckysImage.setImageResource(R.id.newImage);
        }
    });

    return customView;
}