Question

我有一些可绘制的图像并且有一个列表视图。我想单击listview中的图像并在另一个活动中完全打开该图像。我有完整的列表视图但无法显示完整图像。 activity_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: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="50dp"
      android:layout_height="50dp"/>
    <TextView
      android:id="@+id/txt"
      android:layout_width="wrap_content"
      android:layout_height="50dp" />
    </TableRow>
    </TableLayout>

CustomList.java

 package learn2crack.customlistview;
  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;
   }
 }

MainActivity.java

 package learn2crack.customlistview;
  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;
  String[] web = {"Nature1", "Nature2","Nature3","Nature4","Nature5","Nature6","Nature7" } ;
  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) {
    Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
   // I am using this way to show image in another activity
   Intent intent = new Intent(MainActivity.this, FullImage.class);
    startActivity(intent);
 }
  });
 }
  }

full_image.xml

 <?xml version =" 1.0 "encoding="utf-8"?>
  <LinearLayout
    Xmlns:android = " http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android : layout_height="match_parent"
  <ImageView
    android:id="@+id/fullImage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
  <LinearLayout/>

FullImage.java

 package learn2crack.customlistview;
  import android.app.Activity; 
  import android.os.Bundle; 
   public class FullImage extends Activity {
    @Override
      protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.full_image);
     }
   }

请建议我为什么我无法在这个全图像课程中展示图像。

Answer 1

试试这个.. 在MainActivity- onItemClick

中

添加此行

Intent intent = new Intent(MainActivity.this, FullImage.class);
                intent.putExtra("image",imageId[position]);
                startActivity(intent);

并在fullImage类中在setContentView之后添加这些行。

ImageView imageView = (ImageView)findViewById(R.id.fullImage);

        int imageId = getIntent().getIntExtra("image",0);
        imageView.setImageResource(imageId);

Answer 2

您可以发送通过您正在使用的意图点击的图像名称，以启动您可以拍摄的第二个活动，并在第二个活动的imageView上设置适当的图像。

通过意图发送数据，您可以使用 intent.putExtra(name,value) 在第二个活动中，您可以使用intent.getStringExtra(name)从第一个活动中获取该名称，然后在imageview上设置相应的图像。

Answer 3

我有一个想法 - 无论你选择什么，你都需要将图像名称表单activity1传递给activity2。您可以使用puteExtra执行此资源对象，然后您可以以键值对的形式获取字符串或任何其他内容。您遇到此问题是因为您的imageview引用未传递给其他活动

无法在listview的第二个活动中显示图像

3 个答案: