如何在Gridview Android中保持CheckBox持久性(处理复选框状态)? [英] How to keep CheckBox persistence in Gridview Android (handling checkbox state)?
本文介绍了如何在Gridview Android中保持CheckBox持久性(处理复选框状态)?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发一个使用自定义gridview和图像的应用程序；复选框.用图像显示网格视图复选框运作良好.但是在这里，我的问题是，如果我滚动网格视图，请选中一个复选框，然后选中另一个复选框&；再次，如果我再次向下滚动它显示.此处复选框选中状态为maintaing.我的Adapterclass代码是..
I am working on an app where i am using custom gridview with images & checkboxes. Displaying of gridview with images & checkboxes is working good. But here my issue is after make one checkbox checked if i scroll the gridview another checkbox is checked & again if i scroll down again it is displaying. Here checkbox checked state was maintaing. My Adapterclass Code is..
MyGrid.java
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;
}
任何人都可以帮助我如何保持复选框(选中的复选框)的持久状态.
Can anyone help me how to maintain the persistence state of checkbox (selected checkbox).
推荐答案
从上面链接中romain guy的listview解决方案得出.
Drawing from romain guy's solution of listview in the above link.
您的自定义适配器必须实现CompoundButton.OnCheckedChangeListener并使用SparseBooleanArray
Your Custom Adapter must implement CompoundButton.OnCheckedChangeListener and use a 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);
}
示例
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
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
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>
类似于此处回答的那个.代替listview使用gridview而不是textview使用imageview.
Similar to the one answered here. Instead of listview use gridview and instead of textview use imageview.
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