Java 如何在Gridview Android中保持复选框持久性(处理复选框状态)?
我正在开发一个应用程序,我正在使用带有图像和复选框的自定义gridview。显示带有图像和复选框的gridview效果良好。但这里我的问题是,如果我滚动gridview,选中一个复选框,另一个复选框被选中&如果我再次向下滚动,它将再次显示。此处复选框选中状态为维护。我的适配器类代码是 MyGrid.javaJava 如何在Gridview Android中保持复选框持久性(处理复选框状态)?,java,android,checkbox,persistence,android-gridview,Java,Android,Checkbox,Persistence,Android Gridview,我正在开发一个应用程序,我正在使用带有图像和复选框的自定义gridview。显示带有图像和复选框的gridview效果良好。但这里我的问题是,如果我滚动gridview,选中一个复选框,另一个复选框被选中&如果我再次向下滚动,它将再次显示。此处复选框选中状态为维护。我的适配器类代码是 MyGrid.java public class ImageAdapter extends BaseAdapter { private LayoutInflater mInflater; publ
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.galleryitem, null);
holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);
holder.textview = (TextView) convertView.findViewById(R.id.saved_image_name);
Drawable background = holder.textview.getBackground();
background.setAlpha(150);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.checkbox.setId(position);
holder.imageview.setId(position);
holder.textview.setId(position);
holder.checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
// TODO Auto-generated method stub
CheckBox cb = (CheckBox) holder.checkbox;
int id = cb.getId();
if (thumbnailsselection[id]) {
cb.setChecked(false);
thumbnailsselection[id] = false;
selected_images.remove(String.valueOf(id));
} else {
cb.setChecked(true);
thumbnailsselection[id] = true;
if (selected_images.contains(String.valueOf(id))) {
}else{
selected_images.add(String.valueOf(id));
}
}
}
});
holder.imageview.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
int id = v.getId();
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + arrPath[id]),
"image/*");
startActivity(intent);
}
});
if (arrPath[position] == null || arrPath[position].equals(null)) {
}else{
image_name=extractString(arrPath[position]);
String[] splited_name = image_name.split("\\.");
for (int i = 0; i < selected_images.size(); i++) {
if (selected_images.get(i).equals(String.valueOf(position)) || selected_images.get(i) == String.valueOf(position)) {
holder.checkbox.setChecked(true);
}
}
holder.textview.setText(splited_name[0]);
holder.imageview.setImageBitmap(thumbnails[position]);
holder.checkbox.setChecked(thumbnailsselection[position]);
holder.id = position;
holder.imageview.setScaleType(ImageView.ScaleType.FIT_XY);
}
return convertView;
}
}
class ViewHolder {
ImageView imageview;
CheckBox checkbox,checkbox1;
TextView textview;
int id;
}
公共类ImageAdapter扩展了BaseAdapter{
私人停车场;
公共映像适配器(){
mInflater=(LayoutInflater)getSystemService(Context.LAYOUT\u INFLATER\u SERVICE);
}
public int getCount(){
返回计数;
}
公共对象getItem(int位置){
返回位置;
}
公共长getItemId(int位置){
返回位置;
}
公共视图getView(int位置、视图转换视图、视图组父视图){
最终持票人;
if(convertView==null){
holder=新的ViewHolder();
convertView=mInflater.充气(R.layout.galleryitem,空);
holder.imageview=(imageview)convertView.findViewById(R.id.thumbImage);
holder.checkbox=(checkbox)convertView.findViewById(R.id.itemCheckBox);
holder.textview=(textview)convertView.findViewById(R.id.saved\u image\u name);
Drawable background=holder.textview.getBackground();
背景:setAlpha(150);
convertView.setTag(支架);
}否则{
holder=(ViewHolder)convertView.getTag();
}
holder.checkbox.setId(位置);
支架.imageview.setId(位置);
holder.textview.setId(位置);
setOnCheckedChangeListener(新的OnCheckedChangeListener(){
@凌驾
已更改复选框时的公共无效(复合按钮arg0,布尔值arg1){
//TODO自动生成的方法存根
复选框cb=(复选框)holder.CheckBox;
int id=cb.getId();
如果(缩略图选择[id]){
cb.setChecked(假);
thumbnailsselection[id]=false;
选中的_图像。删除(String.valueOf(id));
}否则{
cb.setChecked(真);
thumbnailsselection[id]=真;
if(所选的_images.contains(String.valueOf(id))){
}否则{
选中的_图像。添加(String.valueOf(id));
}
}
}
});
holder.imageview.setOnClickListener(新的OnClickListener(){
公共void onClick(视图v){
//TODO自动生成的方法存根
int id=v.getId();
意图=新意图();
intent.setAction(intent.ACTION\u视图);
intent.setDataAndType(Uri.parse(“文件:/”+arrPath[id]),
“图像/*”;
星触觉(意向);
}
});
if(arrPath[position]==null | | arrPath[position].equals(null)){
}否则{
image_name=extractString(arrPath[position]);
String[]splited\u name=image\u name.split(“\\”);
对于(int i=0;i
有人能帮我维护复选框(选中复选框)的持久性状态吗 细胞被重复使用。在设置id的
getView()
中,还应设置复选框holder.checkbox..setChecked(thumbnailsselection[position])的状态代码>。此外,不建议更改id,如果要保存位置,请使用setTag()
并将位置放在那里,视图在布局中已经有id。
从上面链接中romain guy的listview解决方案中提取
您的自定义适配器必须实现CompoundButton.OnCheckedChangeListener
并使用SparseBooleanArray
然后
然后
范例
public class MainActivity extends Activity implements
AdapterView.OnItemClickListener {
int count;
private CheckBoxAdapter mCheckBoxAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final GridView gridView = (GridView) findViewById(R.id.lv);
gridView.setTextFilterEnabled(true);
gridView.setOnItemClickListener(this);
mCheckBoxAdapter = new CheckBoxAdapter(this);
gridView.setAdapter(mCheckBoxAdapter);
}
public void onItemClick(AdapterView parent, View view, int
position, long id) {
mCheckBoxAdapter.toggle(position);
}
class CheckBoxAdapter extends ArrayAdapter implements CompoundButton.OnCheckedChangeListener
{ private SparseBooleanArray mCheckStates;
LayoutInflater mInflater;
ImageView imageview1,imageview;
CheckBox cb;
CheckBoxAdapter(MainActivity context)
{
super(context,0);
mCheckStates = new SparseBooleanArray(10);
mInflater = (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 10;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = mInflater.inflate(R.layout.checkbox, null);
imageview= (ImageView) vi.findViewById(R.id.textView1);
cb = (CheckBox) vi.findViewById(R.id.checkBox1);
cb.setTag(position);
cb.setChecked(mCheckStates.get(position, false));
cb.setOnCheckedChangeListener(this);
return vi;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
}
}
activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<GridView
android:id="@+id/lv"
android:layout_width="wrap_content"
android:numColumns="2"
android:layout_height="wrap_content"
/>
</RelativeLayout>
checkbox.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="15dp"
android:layout_marginTop="34dp"
android:src="@drawable/ic_launcher"/>
<CheckBox
android:id="@+id/checkBox1"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginRight="22dp"
android:layout_marginTop="23dp" />
</RelativeLayout>
与这里的答案类似。使用gridview代替listview,使用imageview代替textview
是否要选中该复选框以在滚动时保持状态?假设在上下滚动时选中了第一行的复选框(只选中了第一行的复选框)。这就是您要寻找的吗?是的。我正是在寻找解决方案。您对代码的哪一部分感到困惑?请在编辑之前查看代码。您应该能够通过查看示例进行修改。您对哪一部分感到困惑?
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<GridView
android:id="@+id/lv"
android:layout_width="wrap_content"
android:numColumns="2"
android:layout_height="wrap_content"
/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="15dp"
android:layout_marginTop="34dp"
android:src="@drawable/ic_launcher"/>
<CheckBox
android:id="@+id/checkBox1"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginRight="22dp"
android:layout_marginTop="23dp" />
</RelativeLayout>