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:
最佳答案
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];
}
关于android - 单击项目时,自定义 ListView 不会在第二个 Activity 中显示图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28718650/