本文实例讲述了Android编程实现GridView控件点击图片变暗效果的方法。分享给大家供大家参考，具体如下：
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@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
grid = (GridView) findViewById(R.id.grid);
grid.setAdapter(new GridAdapter());
grid.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(MainActivity.this, "ddd", 1000).show();
}
});
}
class GridAdapter extends BaseAdapter {
@Override
public int getCount() {
return imgs.length;
}
@Override
public Object getItem(int arg0) {
return arg0;
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int arg0, View view, ViewGroup arg2) {
if (view == null) {
holder = new ViewHolder();
view = LayoutInflater.from(MainActivity.this).inflate(
R.layout.imgs, null);
holder.view = (ImageView) view.findViewById(R.id.gridimg);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.view.setImageResource(imgs[arg0]);
holder.view.setOnTouchListener(onTouchListener);
return view;
}
class ViewHolder {
ImageView view;
}
public OnTouchListener onTouchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
changeLight((ImageView) view, 0);
// onclick
break;
case MotionEvent.ACTION_DOWN:
changeLight((ImageView) view, -80);
break;
case MotionEvent.ACTION_MOVE:
// changeLight(view, 0);
break;
case MotionEvent.ACTION_CANCEL:
changeLight((ImageView) view, 0);
break;
default:
break;
}
return true;
}
};
}
private void changeLight(ImageView imageview, int brightness) {
ColorMatrix matrix = new ColorMatrix();
matrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1, 0, 0,
brightness, 0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });
imageview.setColorFilter(new ColorMatrixColorFilter(matrix));
}
更多关于Android相关内容感兴趣的读者可查看本站专题：《Android控件用法总结》、《Android开发入门与进阶教程》、《Android视图View技巧总结》、《Android编程之activity操作技巧总结》、《Android数据库操作技巧总结》及《Android资源操作技巧汇总》
希望本文所述对大家Android程序设计有所帮助。