问题
I have the following implementation of a custom ListView populated using a CursorAdapter:
private class CurAdapter extends CursorAdapter{
public CurAdapter(Context context, Cursor c, int flags) {
super(context, c, flags);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
final ViewHolder holder = (ViewHolder) view.getTag();
String name = (cursor.getString(cursor.getColumnIndexOrThrow("NotificationDateFor")));
String image = cursor.getString(cursor.getColumnIndexOrThrow("imageUri"));
holder.nametext.setText(name);
setImage(image, holder.iv);
holder.chk.setOnClickListener(onchk);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View view = LayoutInflater.from(context).inflate(R.layout.group_list, null);
ViewHolder holder = new ViewHolder(view);
view.setTag(holder);
return view;
}
private View.OnClickListener onchk = new View.OnClickListener() {
@Override
public void onClick(View v) {
}
};
public class ViewHolder {
TextView nametext;
RoundedImageView iv;
CheckBox chk;
public ViewHolder(View view){
iv = (RoundedImageView)view.findViewById(R.id.imageView2);
nametext = (TextView) view.findViewById(R.id.textView1);
chk = (CheckBox) view.findViewById(R.id.checkBox1);
}
}
}
I am using a Holder pattern to avoid repetition, but I get check-boxes checked at random while scrolling my list, what do I miss here?
Also I want to know how to store the values of clicked checkboxes in my onClick of the checkbox.
回答1:
Just create an android project and do this step by step:
activity_main.xml
<?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" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="showDialog"
android:text="Click Here..." />
<TextView
android:id="@+id/techView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
MainActivity.java
package com.example.multichoiceitem;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {
final String[] items = { ".NET", "J2EE", "PHP", "Android", "DBMS", "JAVA",
"C", "C++" };
String[] itemstemp;
boolean[] selected = new boolean[items.length];
String selectedTech = "Selected Tech - ";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
itemstemp = new String[items.length];
itemstemp[0] = ".NET";
itemstemp[1] = "Android";
for (int i = 2; i < items.length; i++) {
itemstemp[i] = "";
}
for (int i = 0; i < items.length; i++) {
for (int j = 0; j < itemstemp.length; j++) {
if (items[i].equals(itemstemp[j])) {
selected[i] = true;
}
}
}
}
public void showDialog(View v) {
selectedTech = "";
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Pick a Language");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
for (int i = 0; i < items.length; i++) {
if (selected[i]) {
selectedTech = selectedTech + items[i] + " ";
selected[i] = true;
}
}
TextView tv = (TextView) findViewById(R.id.techView);
tv.setText(selectedTech);
}
});
builder.setMultiChoiceItems(items, selected,
new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which,
boolean isChecked) {
selected[which] = isChecked;
}
});
builder.show();
}
}
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.multichoiceitem"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
this is mulchoice item and it contains the checkbox. just run the code if you face any problem ask me. it is a very easier process..
回答2:
You create an like
List<Integer> positionList
and adapter getviewMethod
checbox.setCheckedChanged method in
positionList.add(position);
and
for(Integer int:positionList){
if(int==position){
yourCheckBox.setChecked(true);
} }
回答3:
I know this question is old but this may be helpful to somebody.
If you're extending SimpleCursorAdapter, you will notice that the textviews inside the items of your ListView don't repeat themselves. Only the checkboxes do. Inside your adapter's class, you need:
private ArrayList<Boolean> checkBoxStates = new ArrayList<>();
Inside the constructor, put:
for(int i = 0; i < getCount(); i++) {
checkBoxStates.add(i, false);
}
and override the getView() method as follows:
public View getView(final int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
CheckBox checkBox = view.findViewById(R.id.checkbox);
checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(((CheckBox)v).isChecked()){
checkBoxStates.set(position, true);
}else{
checkBoxStates.set(position, false);
}
}
});
checkBox.setChecked(checkBoxStates.get(position));
return view;
}
来源：https://stackoverflow.com/questions/29208299/checkbox-check-repeats-in-listview