我有一个包含多个项目的GridView，但是一旦调用了onClickListener，就必须保留这些项目。我怎么能得到这个？
我已经尝试了v.setSelected(true)但它似乎无法正常工作。
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Toast.makeText(Project.this, "Red" + position,
// Toast.LENGTH_SHORT).show(); //position = al catelea element
v.setPressed(true);
if (bp == 2) {
if (position == 0) {
Square.setSex(R.drawable.girl_body2v);
Square2.setHair(R.drawable.girl_hair_01v);
SquareAccesories.setAcc(R.drawable.girl_accessories_01v);
SquareEyes.setEyes(R.drawable.eyes_1v);
SquareLips.setLips(R.drawable.lip_1v);
Square3.setDress(R.drawable.girl_tops_01v);
SquareShoes.setShoes(R.drawable.girl_shoes_01v);
SquarePants.setPants(R.drawable.girl_bottom_01v);
setS(2);
这是onClickListener代码的一小部分，因为我有很多案例。
答案 0 :(得分：52)
我认为更好的方法是告诉GridView您希望支持选择（检查）项目：
gridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE);
然后确保GridView中的项目实现Checkable接口。这意味着这些项可以是Checkbox，ToggleButton等等，或者您可以自己添加Checkable支持 - 例如，使RelativeLayout可以检查。 （参见下面的例子。）
与其他答案相反，大部分工作由GridView本身处理 - 不需要onClickListener。不要自己存储状态，只需调用gridView.getCheckedItemIds()或类似的方法。
使RelativeLayout（或任何东西）可检查成为它的子类：
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {
private boolean checked = false;
private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };
public CheckableRelativeLayout(Context context) {
super(context);
}
public CheckableRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CheckableRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked())
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
return drawableState;
}
@Override
public boolean isChecked() {
return checked;
}
@Override
public void setChecked(boolean _checked) {
checked = _checked;
refreshDrawableState();
}
@Override
public void toggle() {
setChecked(!checked);
}
}
请注意，方法onCreateDrawableState会更新视觉样式。您不必这样做，例如，您可以直接更改setChange方法中的背景。
然后使用CheckableRelativeLayout作为GridView中项目的顶视图：
<foo.bar.CheckableRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/my_awesome_background"
... more stuff
>
... content of the relative layout
</com.test.CheckableRelativeLayout>
并定义在res/drawable/my_awesome_background.xml中选中项目时背景的变化：
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_checked="true" >
<!-- This applies when the item is checked. -->
<shape android:shape="rectangle" >
<solid android:color="#A8DFF4" />
</shape>
</item>
<item>
<!-- This applies when the item is not checked. -->
<shape android:shape="rectangle" >
<solid android:color="#EFEFEF" />
</shape>
</item>
</selector>
答案 1 :(得分：17)
您想要实现的概念是可能的，但不像您现在的工作方式。
最好和最简单的解决方案是跟踪被点击项目的状态，并在适配器内为它们提供正确的布局。我设置了一个小例子：
<强>活动
public class StackOverFlowActivity extends Activity {
GridView gridView;
MyCustomAdapter myAdapter;
ArrayList<GridObject> myObjects;
static final String[] numbers = new String[] { "A", "B", "C", "D", "E",
"F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
"S", "T", "U", "V", "W", "X", "Y", "Z" };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myObjects = new ArrayList<GridObject>();
for (String s : numbers) {
myObjects.add(new GridObject(s, 0));
}
gridView = (GridView) findViewById(R.id.gridView1);
myAdapter = new MyCustomAdapter(this);
gridView.setAdapter(myAdapter);
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) {
myObjects.get(position).setState(1);
myAdapter.notifyDataSetChanged();
}
});
}
static class ViewHolder {
TextView text;
}
private class MyCustomAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public MyCustomAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
GridObject object = myObjects.get(position);
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item_icon_text, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(object.getName());
if (object.getState() == 1) {
holder.text.setBackgroundColor(Color.GREEN);
} else {
holder.text.setBackgroundColor(Color.BLUE);
}
return convertView;
}
@Override
public int getCount() {
return myObjects.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
}
}
<强> GridObject
public class GridObject {
private String name;
private int state;
public GridObject(String name, int state) {
super();
this.name = name;
this.state = state;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getState() {
return state;
}
public void setState(int state) {
this.state = state;
}
}
<强> main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<GridView
android:id="@+id/gridView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="50dp"
android:gravity="center"
android:numColumns="auto_fit"
android:stretchMode="columnWidth" >
</GridView>
</LinearLayout>
<强> list_item_icon_text
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/text"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
答案 2 :(得分：6)
当您不需要在其他地方重用该代码时，这是Strix的答案（我认为比接受的答案更好）的更简洁版本。您可以在Checked方法中创建一个匿名类，而不是在Strix的答案中覆盖Adapter.getView，而不是创建新类并实现onCreateDrawableState，而是将isChecked()替换为((AbsListView)parent).isItemChecked(position)。这是我的适配器的完整代码，它在画廊中的已检查缩略图周围绘制边框：
public class ImageAdapter extends BaseAdapter {
private final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };
public int getCount() {return images.size();}
public Object getItem(int position) {return images.get(position);}
public long getItemId(int position) {return position;}
public View getView(final int position, final View convertView, final ViewGroup parent) {
final ImageView imageView = new ImageView(getApplicationContext()) {
@Override public int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (((AbsListView)parent).isItemChecked(position)) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
};
imageView.setBackground(getResources().getDrawable(R.drawable.my_awesome_background));
imageView.setScaleType(ImageView.ScaleType.CENTER);
final byte[] buffer = images.get(position);
final Bitmap bmp = BitmapFactory.decodeByteArray(buffer, 0, buffer.length);
imageView.setImageBitmap(bmp);
return imageView;
}
}
答案 3 :(得分：3)
我知道答案有点老了。但我认为这是最简单的一个。 在Adapter类中，添加包含所选Item Position的变量。 将所有图像的transperency设置为GetView方法中的所选图像。 在main方法的click处理程序中，保护选定的ItemPosition。 通知适配器他已更改。
在您的适配器类中，添加一个包含所选项目位置的变量。
public class GridImageAdapter extends BaseAdapter {
public int selectedImage = 0;
为所有图片设置transperency，不包括Adapter GetView方法中的选定图片。
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
int[] images = { R.drawable.walk, R.drawable.run, R.drawable.jump }
ImageView imageView = new ImageView(mContext);
if (position < imgMapper.length) {
imageView.setImageResource(images[position]);
if (position != selectedImage) {
imageView.setImageAlpha(50);
}
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(150, 150));
};
return imageView;
}
在main方法的点击处理程序中，保护选定的ItemPosition。 通知适配器他已更改
myGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
GridImageAdapter myAdapter = (GridImageAdapter) myGridView.getAdapter();
myAdapter.selectedImage = position;
myAdapter.notifyDataSetChanged();
}
});
答案 4 :(得分：1)
gridview中的观看次数必须为CheckBoxs，这样您就可以选中并取消选中它们。
答案 5 :(得分：0)
**You can add tag and check for tag**
gv.setOnItemClickListener((adapterView, view, i, l) -> {
int f = gv.getCheckedItemPosition();
if(view.getTag()=="selected")
{
view.setTag("notselected");
String clickedText = gv.getItemAtPosition(i).toString();
filterKeywords.remove(clickedText);
view.setBackgroundColor(Color.WHITE);
}
else
{
view.setTag("selected");
String clickedText = gv.getItemAtPosition(i).toString();
filterKeywords.add(clickedText);
view.setBackgroundColor(Color.GREEN);
}
System.out.println("KEYWORDS"+filterKeywords);
});