Java 如何保存以编程方式制作的单选按钮,以便它们在滚动时不会消失?
在检查单选按钮时,我无法将其保存在您手机的本地。每次我在listview中滚动时,选中的单选按钮都会消失,我也检查过互联网,但10个单选按钮中有9个是用XML文件制作的,与我的不同Java 如何保存以编程方式制作的单选按钮,以便它们在滚动时不会消失?,java,android,Java,Android,在检查单选按钮时,我无法将其保存在您手机的本地。每次我在listview中滚动时,选中的单选按钮都会消失,我也检查过互联网,但10个单选按钮中有9个是用XML文件制作的,与我的不同 public class Bouw_onderdeel extends Activity { public String[] naam = {"Bouw onderdeel", "Kapconstructie","Kapconstructieve bevesiging","Doorbuiging","Vochtinw
public class Bouw_onderdeel extends Activity {
public String[] naam = {"Bouw onderdeel", "Kapconstructie","Kapconstructieve bevesiging","Doorbuiging","Vochtinwerking","Dakconstructie","Constructieve bevesiging","Doorbuiging","Vochtinwerking","Waterkerende lagen","Waterdichtheid (folie)laag","Lekwaterafvoerend vermogen","Detaillering aan dakvoet","Thermischeisolatie","Bevestiging","Aansluitdetails","Isolerend vermogen","Dakpannen en vorsten","Conditie dakpannen en vorsten","Breukschade","Vorstschade","Afschilfering","Aangroei algen en mos"};
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bouwonderdeel_layout);
getActionBar().setDisplayHomeAsUpEnabled(true);
//RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.layoutBouwonderdeel);
ListView list = new ListView(this);
list.setAdapter(new MyAdapter(this, naam));
setContentView(list);
}
private class MyAdapter extends ArrayAdapter<String> {
public MyAdapter(Context context, String[] strings) {
super(context, -1, -1, strings);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//Making the listview.
LinearLayout listLayout = new LinearLayout(Bouw_onderdeel.this);
listLayout.setLayoutParams(new AbsListView.LayoutParams(
AbsListView.LayoutParams.WRAP_CONTENT,
AbsListView.LayoutParams.WRAP_CONTENT));
listLayout.setId(5000);
//Making the radiogroup
RadioGroup rbg = new RadioGroup(Bouw_onderdeel.this);
rbg.setId(3927);
rbg.setLayoutParams(new AbsListView.LayoutParams(
AbsListView.LayoutParams.WRAP_CONTENT,
AbsListView.LayoutParams.WRAP_CONTENT)
);
rbg.setOrientation(LinearLayout.HORIZONTAL);
//Add the textviews inside the listview
TextView listText = new TextView(Bouw_onderdeel.this);
listText.setId(5001);
//For every listview add 5 radiobuttons
for (int i = 0; i < 5; i++) {
RadioButton rbtn = new RadioButton (Bouw_onderdeel.this);
rbg.addView(rbtn);
}
rbg.setGravity(Gravity.CENTER_HORIZONTAL);
rbg.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
//Spot where I wanna save I guess?
}
});
listLayout.setGravity(Gravity.CENTER);
//Add the radiogroup to the listview.
listLayout.addView(rbg);
//Add the listtext to the view.
listLayout.addView(listText);
listText.setText(super.getItem(position));
return listLayout;
}
}
修改getView方法,如下所示
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout listLayout = null;
if (convertView == null) {
// Making the listview.
listLayout = new LinearLayout(Bouw_onderdeel.this);
listLayout.setLayoutParams(new AbsListView.LayoutParams(AbsListView.LayoutParams.WRAP_CONTENT, AbsListView.LayoutParams.WRAP_CONTENT));
listLayout.setId(5000);
// Making the radiogroup
RadioGroup rbg = new RadioGroup(Bouw_onderdeel.this);
rbg.setId(3927);
rbg.setLayoutParams(new AbsListView.LayoutParams(AbsListView.LayoutParams.WRAP_CONTENT, AbsListView.LayoutParams.WRAP_CONTENT));
rbg.setOrientation(LinearLayout.HORIZONTAL);
// Add the textviews inside the listview
TextView listText = new TextView(Bouw_onderdeel.this);
listText.setId(5001);
// For every listview add 5 radiobuttons
for (int i = 0; i < 5; i++) {
RadioButton rbtn = new RadioButton(Bouw_onderdeel.this);
rbg.addView(rbtn);
}
rbg.setGravity(Gravity.CENTER_HORIZONTAL);
rbg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// Spot where I wanna save I guess?
}
});
listLayout.setGravity(Gravity.CENTER);
// Add the radiogroup to the listview.
listLayout.addView(rbg);
// Add the listtext to the view.
listLayout.addView(listText);
listText.setText(super.getItem(position));
convertView = listLayout;
convertView.setTag(listLayout);
} else {
listLayout = (LinearLayout) convertView.getTag();
}
return listLayout;
}
非常感谢到目前为止的帮助!,但每当我选中第一个单选按钮并向下滚动时,它就会从顶部消失,并被放在最后一个listitem的下面。同一个项目会重复两次。所以,你面临着这样的问题我不完全确定你的意思,想解释一下吗?提前感谢Sume,如果您在listview中有20行,并且在第一个快照中可以看到10行,那么在这种情况下,getView方法中的视图将为null,稍后滚动时,将使用相同的视图,并且这些视图不为null,因此您可以;我们也看到了下面单选按钮的检查。是的,很抱歉,我还是java/android的初学者,但是视图在第一个快照中总是空的,并且一旦滚动视图,就会收到不同的数据类型而不是空的,所以getView方法会将空的列表项放在非空的列表项下面吗?如果这是正确的,那么很难解决这样的问题吗?