Question

我创建了自定义Listview，它必须将图像显示为列表，但图像不会显示。我有6个尺寸为400x100的图像我希望它们在listview中显示为行。我无法找到我错在哪里。请帮我。提前致谢。主要活动源代码。

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import android.app.Activity;
public class MainActivity extends Activity {
  ListView list;

  Integer[] imageId = {
      R.drawable.image1,
      R.drawable.image2,
      R.drawable.image3,
      R.drawable.image4,
      R.drawable.image5,
      R.drawable.image6,
  };
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    CustomList adapter = new
        CustomList(MainActivity.this,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) {
                }
            });
  }
}

CustomList adapter

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<ImageView>{
private final Activity context;
private final Integer[] imageId;
public CustomList(Activity context, Integer[] imageId) {
super(context, R.layout.list_single);
this.context = context;
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);
ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
imageView.setImageResource(imageId[position]);
return rowView;
}
}

acitivity_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>

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="match_parent"
            android:layout_height="match_parent"/>

</TableRow>
</TableLayout>

Answer 1

您是否尝试删除RelativeLayout所在的ListView？如果其中只有ListView，则无效。

您还可以尝试将android:layout_width和android:layout_height设置为match_parent。

您是否也尝试在列表项中添加其他内容（例如带有模拟值的TextView），以查看是否显示了该内容？

Listview没有显示图像

1 个答案: