1、在GridView 中我们会遇到当选中某个Item 时想让它处于高亮或者是放大的操作，我们只需要在setOnItemClickListener（） 方法中把相应的position 给传过去。
package com.example.sgridview;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
public class MainActivity extends Activity {
private GridView gridView;
private MyAdapter adapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lists.add(R.drawable.ic_launcher);
lists.add(R.drawable.ic_launcher);
lists.add(R.drawable.ic_launcher);
this.gridView = (GridView) this.findViewById(R.id.gridView);
adapter = new MyAdapter();
this.gridView.setAdapter(adapter);
this.gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView> arg0, View arg1, int id, long arg3) {
// TODO Auto-generated method stub
MyAdapter ad = (MyAdapter) arg0.getAdapter();
ad.setNotifyDataChange(id);
}
});
}
private List lists = new ArrayList();
private class MyAdapter extends BaseAdapter {
private int selectPic = -1;
@Override
public int getCount() {
// TODO Auto-generated method stub
return lists.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return lists.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public void setNotifyDataChange(int id) {
selectPic = id;
super.notifyDataSetChanged();
}
@SuppressLint("NewApi")
@Override
public View getView(int position, View view, ViewGroup arg2) {
ImageView img = new ImageView(MainActivity.this);
img.setBackgroundResource(lists.get(position));
if (selectPic == position) {
Animation testAnim = AnimationUtils.loadAnimation(MainActivity.this, R.anim.anim);
img.startAnimation(testAnim);
} else {
// the rest
img.setScaleType(ScaleType.CENTER_INSIDE);
}
return img;
}
}
}
2、anim.xml 文件
