android - 单击项目时，自定义 ListView 不会在第二个 Activity 中显示图像

Question

我已经将一个自定义的 ListView 放在一起，列表中包含图像和文本。然后我创建了第二个 Activity ，当在列表中单击时，以更大的格式显示图像。

虽然我已经将所有看起来正确的代码放在一起(没有错误等)，Intent 没有显示更大的图像(图像都在同一个可绘制文件夹中 - 只有在 ImageViews 中设置的尺寸会给出不同的输出。该应用程序在 ListView 中显示图像和文本，但没有图像显示在 single_list_item_view 屏幕中(当单击单行)。

这是我的代码:

MainActivity.java:

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;

public class MainActivity extends Activity {
    ListView list;
    String[] web = {
        "Google Plus",
            "Twitter",
            "Windows",
            "Bing",
            "Itunes",
            "Wordpress",
            "Drupal"
    } ;
    Integer[] imageId = {
            R.drawable.image1,
            R.drawable.image2,
            R.drawable.image3,
            R.drawable.image4,
            R.drawable.image5,
            R.drawable.image6,
            R.drawable.image7


    };

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


        CustomList adapter = new
                CustomList(MainActivity.this, web, imageId);
        list=(ListView)findViewById(R.id.list);
                list.setAdapter(adapter);
                list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) {

                        ImageView imgview = (ImageView) view.findViewById(R.id.img);
                        int images = imgview.getId();
                        //Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
                        Intent i = new Intent(getApplicationContext(), SingleListItem.class);
                        i.putExtra("zurag", images);
                        startActivity(i);
                    }
                });




    }

}

自定义列表.java:

import android.app.Activity;
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 CustomList extends ArrayAdapter<String>{

private final Activity context;
private final String[] web;
private final Integer[] imageId;
public CustomList(Activity context,
String[] web, Integer[] imageId) {
super(context, R.layout.list_single, web);
this.context = context;
this.web = web;
this.imageId = imageId;

}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.list_single, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.txt);

ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
txtTitle.setText(web[position]);

imageView.setImageResource(imageId[position]);
return rowView;
}
}

SingleListItem.java

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.ImageView;

public class SingleListItem extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.single_list_item_view);

        ImageView images = (ImageView) findViewById(R.id.imageView1);
        Intent i = getIntent();
        int pic =i.getIntExtra("zurag", 0);
        images.setImageResource(pic);

    }
}

list_single.xml:

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TableRow>
        <ImageView
            android:id="@+id/img"
            android:layout_width="70dp"
            android:layout_height="70dp"/>

        <TextView
            android:id="@+id/txt"
            android:layout_width="wrap_content"
            android:textSize="25dip"
            android:layout_height="70dp" />

</TableRow>
</TableLayout>

single_list_item_view.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/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="88dp"
        android:text="TextView"
        android:textSize="30dp" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="480dp"
        android:layout_height="344dp"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="145dp" />

</RelativeLayout>

activity_main.xml:

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ListView
       android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

    </ListView>

</RelativeLayout>

这是缺少的 SingleListItem 类:

Answer 1

Custom ListView doesn't display image in Second Activity when item clicked on

imgview.getId(); 返回 ImageView 的 id 而不是用作 ImageView 的图像可绘制 ID > 源代码。

使用 getAdapter().getItem 或 imageId[position] 获取点击行 Drawable 的 id :

 int images = parent.getAdapter().getItem(position);

现在在下一个 Activity 中发送带有 Intent 的 images

编辑:

在CustomList类中添加getItem方法:

@Override
public int  getItem(int position) {
    return imageId[position];
}