Android编程实现GridView控件点击图片变暗效果的方法
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：
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(newGridAdapter());
grid.setOnItemClickListener(newOnItemClickListener(){
@Override
publicvoidonItemClick(AdapterViewarg0,Viewarg1,intarg2,
longarg3){
Toast.makeText(MainActivity.this,"ddd",1000).show();
}
});
}
classGridAdapterextendsBaseAdapter{
@Override
publicintgetCount(){
returnimgs.length;
}
@Override
publicObjectgetItem(intarg0){
returnarg0;
}
@Override
publiclonggetItemId(intarg0){
returnarg0;
}
@Override
publicViewgetView(intarg0,Viewview,ViewGrouparg2){
if(view==null){
holder=newViewHolder();
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);
returnview;
}
classViewHolder{
ImageViewview;
}
publicOnTouchListeneronTouchListener=newView.OnTouchListener(){
@Override
publicbooleanonTouch(Viewview,MotionEventevent){
switch(event.getAction()){
caseMotionEvent.ACTION_UP:
changeLight((ImageView)view,0);
//onclick
break;
caseMotionEvent.ACTION_DOWN:
changeLight((ImageView)view,-80);
break;
caseMotionEvent.ACTION_MOVE:
//changeLight(view,0);
break;
caseMotionEvent.ACTION_CANCEL:
changeLight((ImageView)view,0);
break;
default:
break;
}
returntrue;
}
};
}
privatevoidchangeLight(ImageViewimageview,intbrightness){
ColorMatrixmatrix=newColorMatrix();
matrix.set(newfloat[]{1,0,0,0,brightness,0,1,0,0,
brightness,0,0,1,0,brightness,0,0,0,1,0});
imageview.setColorFilter(newColorMatrixColorFilter(matrix));
}
希望本文所述对大家Android程序设计有所帮助。