Question

所以我设置了一个图库，通过点击，用户可以从视图中选择一张图片，然后用它来查看图片及其相应的烤面包。

问题是弹出的图像只有三个。我不知道为什么，并且没有限制画廊的变量，所以我不知所措。

我的主要人物：

public class MainActivity<View> extends Activity 
{

 ImageView selectedImage;  
 private Integer[] mImageIds = {
            R.drawable.image1,
            R.drawable.image2,
            R.drawable.image3,
            R.drawable.image4,
            R.drawable.image5,
            R.drawable.image6,
            R.drawable.image7,
            R.drawable.image8,
            R.drawable.image9,
            R.drawable.image10
    };
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

         Gallery gallery = (Gallery) findViewById(R.id.gallery1);
    selectedImage=(ImageView)findViewById(R.id.imageView1);
    gallery.setSpacing(1);
    gallery.setAdapter(new GalleryImageAdapter(this));

    gallery.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            Toast.makeText(MainActivity.this, "THIS TEXT SHOULD NEVER SHOW = " + position, Toast.LENGTH_SHORT).show();
            // show the selected Image
            selectedImage.setImageResource(mImageIds[position]);
        }

        @Override
        public void onItemClick(AdapterView<?> parent, android.view.View v, int position, long id) {
            Toast.makeText(MainActivity.this, "Picture Number: " + position, Toast.LENGTH_SHORT).show();
            // show the selected Image
            selectedImage.setImageResource(mImageIds[position]);

        }
    });
}
}

MY XML：

<LinearLayout 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:orientation="vertical" >

<Gallery
    android:id="@+id/gallery1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="350dp"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="100dp"
    android:layout_weight="0.13"
    android:src="@drawable/image1" />

</LinearLayout>

Answer 1

我猜你在创建新的GalleryImageAdapter时忘了用mImageIds填充适配器。

Answer 2

您需要使用适配器：

将适配器调用更改为：

gallery.setAdapter（new GalleryImageAdapter（this，mImageIds））;

添加/更新 GalleryImageAdapter.java：

import java.util.List;

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class GalleryImageAdapter extends BaseAdapter {

private Activity context;

private static ImageView imageView;

private List<Drawable> plotsImages;

private static ViewHolder holder;

public GalleryImageAdapter(Activity context, List<Drawable> plotsImages) {

this.context = context;
this.plotsImages = plotsImages;

}

@Override
public int getCount() {
    return plotsImages.size();
}

@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return 0;
}

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

  if (convertView == null) {

    holder = new ViewHolder();

    imageView = new ImageView(this.context);

    imageView.setPadding(3, 3, 3, 3);

    convertView = imageView;

    holder.imageView = imageView;

    convertView.setTag(holder);

} else {

    holder = (ViewHolder) convertView.getTag();
}

holder.imageView.setImageDrawable(plotsImages.get(position));

holder.imageView.setScaleType(ImageView.ScaleType.FIT_XY);
holder.imageView.setLayoutParams(new Gallery.LayoutParams(150, 90));

return imageView;
}

private static class ViewHolder {
    ImageView imageView;
}

}

Android Gallery只显示三张图片

2 个答案: