卡到gridview!!! 過了,可以展示出圖檔,並能點選圖檔看編號

 卡到gridview http://developer.android.com/resources/tutorials/views/hello-gridview.html
出現了些錯誤的提示

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同一主題,在網上搜到另一則,
http://www.linuxtopia.org/online_books/android/devguide/guide/tutorials/views/hello-gridview.html

雖然暫不能點選,但是可以Show出所有的图了.

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終於瞭解問題,修復如下,之前顯然是沒有import夠,另外將class ImageAdapter並到同一java檔案裡好像也避開了些問題.

package com.taijimark;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class HelloGridView extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        GridView gridview = (GridView) findViewById(R.id.gridview);   
        gridview.setAdapter(new ImageAdapter(this));
       
  gridview.setOnItemClickListener(new OnItemClickListener() {
   public void onItemClick(AdapterView<?> parent, View v,int position, long id) {
    Toast.makeText(HelloGridView.this, "" + position,Toast.LENGTH_SHORT).show();
   }
  });

    }
   
   
   
    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
        };
    }
}

 

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附上之前錯誤的提示,以供日後參考
  Thu Feb 16 15:11:06 CST 2012
Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".

java.lang.NullPointerException
at com.talkweb.ide.plugin.listener.AppFolderListener.resourceChanged(AppFolderListener.java:27)
at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:291)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)
at org.eclipse.core.internal.events.NotificationManager.handleEvent(NotificationManager.java:249)
at org.eclipse.core.internal.resources.Workspace.broadcastEvent(Workspace.java:307)
at org.eclipse.core.internal.resources.Project.close(Project.java:165)
at org.eclipse.ui.actions.CloseResourceAction.invokeOperation(CloseResourceAction.java:129)
at org.eclipse.ui.actions.WorkspaceAction.execute(WorkspaceAction.java:162)
at org.eclipse.ui.actions.WorkspaceAction$2.runInWorkspace(WorkspaceAction.java:483)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)