我在 android 中创建一个简单的 GridView 应用程序,其中单击时的图像会在新窗口中以全屏形式打开。
应用程序图像:
我还将随机图像生成代码放在getView方法中,如下所示:
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
ImageView iv;
shuffleArray(images);
if(arg1!=null){
iv=(ImageView)arg1;
}else{
iv=new ImageView(context);
iv.setLayoutParams(new GridView.LayoutParams(80,80)); //resizing the picture according to the params
iv.setScaleType(ScaleType.CENTER_CROP);//images will be cropped towards center
iv.setPadding(8, 8, 8, 8); //padding of all sides if images vary then less padding more crop to fit imageview
}
iv.setImageResource( images[arg0]);
return iv;
}
static void shuffleArray(int[] images2) {
// TODO Auto-generated method stub
Random rnd=new Random();
for(int i=images2.length-1;i>=0;i--){
int index=rnd.nextInt(i+1);
int temp=images2[index];
images2[index]=images2[i];
images2[i]=temp;
}
}
每次我打开应用程序时,图片都会出现一些问题。
现在的问题如下:
>
每当我单击图像缩略图时,都会在新窗口中打开不同的图像。
GridView Activity中显示了两个或多个不同图像的相同图像缩略图。
和
我应该如何解决上述问题?
我的整个源代码:主要活动.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gv=(GridView)findViewById(R.id.gridView);
gv.setAdapter(new ImageAdapter(getApplicationContext()));
gv.setOnItemClickListener(new OnItemClickListener(){
private boolean[] isSpecificImage;{
isSpecificImage[0]=true;
}
@Override
public void onItemClick(AdapterView<?> parentView, View iv, int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), ""+position, Toast.LENGTH_SHORT).show();
Intent i=new Intent(getApplicationContext(),ImageDetail.class); // for click open that image as new activity
i.putExtra("id", position);
startActivity(i);
}
});
ImageAdapter类
public class ImageAdapter extends BaseAdapter {
私人语境;public static int[]images={R.drawable.goku,R.drawaable.gohan,R.dravable.vegeta,R.dracable.browly,R.drawbable.buu};
public ImageAdapter(Context applicationContext) {
context = applicationContext;
shuffleArray(images);
}
@Override
public int getCount() {
// no of items to be displayed
return images.length;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
ImageView iv;
if(arg1!=null){
iv=(ImageView)arg1;
}else{
iv=new ImageView(context);
iv.setLayoutParams(new GridView.LayoutParams(80,80)); //resizing the picture according to the params
iv.setScaleType(ScaleType.CENTER_CROP);//images will be cropped towards center
iv.setPadding(8, 8, 8, 8); //padding of all sides if images vary then less padding more crop to fit imageview
}
iv.setImageResource( images[arg0]);
return iv;
}
void shuffleArray(int[] images2) {
// TODO Auto-generated method stub
Random rnd=new Random();
for(int i=images2.length-1;i>=0;i--){
int index=rnd.nextInt(i+1);
int temp=images2[index];
images2[index]=images2[i];
images2[i]=temp;
}
}
}
图像细节类
public class ImageDetail extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.imagedetail);
Intent i=getIntent();
int position =(Integer) i.getExtras().get("id");
ImageView iv=(ImageView)findViewById(R.id.ivdbz);
iv.setImageResource(ImageAdapter.images[position]);
}
}
您可以使用OnClickItemListener中的位置来放置< code>finish()
gridView中的条件
shuffleArray(images);
该语句不属于getView()
。不应在每次调用getView()时都进行洗牌。
换个地方打吧。