[英]How to keep CheckBox persistence in Gridview Android (handling checkbox state)?
我正在使用將自定義gridview與圖像和復選框一起使用的應用程序。 顯示帶有圖像和復選框的gridview效果很好。 但是在這里,我的問題是,如果我滾動網格視圖,則選中一個復選框,如果我再次向下滾動,則再次選中它。 在此復選框選中狀態為maintaing。 我的Adapterclass代碼是..
MyGrid.java
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;
}
任何人都可以幫助我如何保持復選框(選定復選框)的持久狀態。
https://groups.google.com/forum/?fromgroups#!topic/android-developers/No0LrgJ6q2M
從上面鏈接中romain guy的listview解決方案得出。
您的自定義適配器必須實現CompoundButton.OnCheckedChangeListener
並使用SparseBooleanArray
然后
cb.setChecked(mCheckStates.get(position, false));
cb.setOnCheckedChangeListener(this);
然后
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) {
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
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>
與此處回答的類似。 代替listview使用gridview代替textview使用imageview。
單元被重用。 在要設置ID的getView()
中,還應該設置復選框holder.checkbox..setChecked(thumbnailsselection[position]);
。 另外,也不建議更改ID,如果要保存位置,請使用setTag()
並將位置放在此處,視圖中的布局中已經具有ID。
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