0

まず、グリッドビューで画像を設定するために独自のアダプタクラスを作成する必要がありますか？その継ぎ目は非効率的であり、グリッドビューを作成するたびに新しいクラスを作成する必要があります。

私が抱えている問題は、グリッドビューに画像を表示できないことです。

package joshpike.hsh.hsh_game;

import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;


public class DisplayActivity extends MainActivity
{
    public class ImageAdapter extends BaseAdapter 
    {
        private Context mContext;

        // create a new ImageView for each item referenced by the Adapter
        public View getView(int position, View convertView, ViewGroup parent) 
        {
            ImageView imageView;
            if (convertView == null) 
            {  
                // if it's not recycled, initialize some attributes
                imageView = new ImageView(mContext);
                imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(8, 8, 8, 8);
            } 
            else 
            {
                imageView = (ImageView) convertView;
            }

           imageView.setImageResource(imageArray[position]);
            return imageView;
        }


        private Integer[] imageArray = 
        {
            //currentImageView(0, "xh","bottom",0,0), currentImageView(0, "xh","bottom",1,0)    
            R.drawable.level_1_bottom, R.drawable.level_1_top
        };


        @Override
        public int getCount() 
        {
            return 0;
        }

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

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


    // Inflate the menu; this adds items to the action bar if it is present.
    //makes the options menu
    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        getMenuInflater().inflate(R.menu.display, menu);
        return true;
    }

    //what happens if you select items from the options menu
    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        switch (item.getItemId() )
        {
            case R.id.miniMap:

            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    //called when activity is started for first time either for first time or after destroyed
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display);

        GridView bottomMapGrid = (GridView)findViewById(R.id.bottomMapGrid);

        bottomMapGrid.setAdapter(new ImageAdapter());

        System.out.println("DisplayActivity onCreate done");        
    }
4

2 に答える 2

0

現在、コンストラクターにNullmContextを渡して作成しています。ImageView次のように使用する前に初期化する必要がありますmContext：

public class ImageAdapter extends BaseAdapter 
    {
        private Context mContext;

        public ImageAdapter(Context mContext){
           this.mContext=mContext;  //<<< initialize here
        }
         //....your code here
    }

およびアクティビティからImageAdapterインスタンスを作成するには、現在のアクティビティコンテキストを次のように渡します。

bottomMapGrid.setAdapter(new ImageAdapter(DisplayActivity.this));
于 2013-03-13T03:35:38.527 に答える
0 
 @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display);
        GridView bottomMapGrid = (GridView)findViewById(R.id.bottomMapGrid);
        bottomMapGrid.setAdapter(new ImageAdapter(this));
        System.out.println("DisplayActivity onCreate done");        
    }

そしてAdapterクラスはこのように使用します

public class ImageAdapter extends BaseAdapter {
  private Context mContext;

  public ImageAdapter(Context c) {
      mContext = c;
  }

  public int getCount() {
      return mThumbIds.length;
  }

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

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

  // create a new ImageView for each item referenced by the Adapter
  public View getView(int position, View convertView, ViewGroup parent) {
      ImageView imageView;
      if (convertView == null) { // if it's not recycled, initialize some
                                  // attributes
          imageView = new ImageView(mContext);
          imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
          imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
          imageView.setPadding(8, 8, 8, 8);

      } else {
          imageView = (ImageView) convertView;
      }

      imageView.setImageResource(mThumbIds[position]);

      return imageView;
  }

  // references to our images
  private Integer[] mThumbIds = { R.drawable.sample_2, R.drawable.sample_3,
          R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6,
          R.drawable.sample_7, R.drawable.sample_0, R.drawable.sample_1,
          R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4,
          R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7,
          R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2,
          R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5,
          R.drawable.sample_6, R.drawable.sample_7 };
}
于 2013-03-13T05:03:27.527 に答える