我有一个自定义SimpleCursorAdapter，可根据光标向ListView呈现自定义视图。在我的getView方法中，我对自定义视图进行了充气，并初始化其值。
在同一个适配器中，我为所有项目视图定义了侦听器。但每当我初始化时，值更改和此更改都会触发侦听器。这使我ListView滞后，因为它不是对数据库进行简单的“选择”，而是进行“选择”和“更新”。
这是我的适配器代码：
public class SmartFormCursorAdapter extends SimpleCursorAdapter implements
CompoundButton.OnCheckedChangeListener, OnDateChangedListener,
SeekBar.OnSeekBarChangeListener, RadioGroup.OnCheckedChangeListener {
String sp_lib_name = null;
Cursor c;
Context context;
TextView sbDisp = null;
String idField = null;
String idForm = null;
public SmartFormCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
super(context, layout, c, from, to);
this.c = c;
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null)
convertView = View.inflate(context, R.layout.smart_form_element, null);
View row = convertView;
c.moveToPosition(position);
TextView fieldId = (TextView) convertView.findViewById(R.id.fieldId);
TextView fieldType = (TextView) convertView.findViewById(R.id.fieldType);
TextView fieldHint = (TextView) convertView.findViewById(R.id.fieldHint);
TextView fieldName = (TextView) convertView.findViewById(R.id.fieldName);
TextView formId = (TextView) convertView.findViewById(R.id.formId);
String type = c.getString(c.getColumnIndexOrThrow("type"));
idField = c.getString(c.getColumnIndexOrThrow("idField"));
String hint = c.getString(c.getColumnIndexOrThrow("hint"));
String name = c.getString(c.getColumnIndexOrThrow("fieldName"));
idForm = c.getString(c.getColumnIndexOrThrow("idForm"));
String currVal = H.getData(context, idField, idForm);
// Log.w("SP currVal Field:" + idField, "Curr val: " + currVal);
fieldId.setText(idField);
fieldType.setText(type);
fieldHint.setText(hint);
fieldName.setText(name);
formId.setText(idForm);
// _________________________________
// ________________________ TEXT
// _________________________________
if (type.equals("Text") || type.equals("Numeric")) {
EditText et = (EditText) convertView.findViewById(R.id.valueText);
if (type.equals("Text")) {
et.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_MULTI_LINE);
et.setHeight(80);
}
if (type.equals("Numeric")) {
et.setInputType(InputType.TYPE_CLASS_NUMBER);
et.setHeight(40);
}
et.setTag(idField);
et.setText(currVal);
// et.setText("jjj");
et.addTextChangedListener(new CustomTextWatcher(et) {
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void afterTextChanged(Editable s) {
// Log.w("Text listener Field:" +
// this.getEditTextObj().getTag().toString(), "Result:" +
// s.toString());
H.saveData(context, this.getEditTextObj().getTag().toString(), s.toString(), idForm);
}
});
et.setVisibility(View.VISIBLE);
} else {
EditText et = (EditText) convertView.findViewById(R.id.valueText);
et.setVisibility(View.GONE);
}
// _________________________________
// ________________________ DATE
// _________________________________
if (type.equals("Date")) {
DatePicker dp = (DatePicker) convertView.findViewById(R.id.valueDate);
dp.setTag(idField);
String[] dateData = null;
// Log.w("Date value Field:" + idField, "Result:" + currVal);
if (!currVal.equals("err") && currVal.length() >= 8 && currVal.length() <= 10) {
dateData = currVal.split("/");
int month = Integer.valueOf(dateData[1]) - 1;
dp.init(Integer.valueOf(dateData[2]), month, Integer.valueOf(dateData[0]), this);
} else
dp.init(2011, 1, 1, this);
dp.setVisibility(View.VISIBLE);
} else {
DatePicker dp = (DatePicker) convertView.findViewById(R.id.valueDate);
dp.setVisibility(View.GONE);
}
// _________________________________
// ________________________SEEKBAR
// _________________________________
if (type.equals("Note")) {
SeekBar sb = (SeekBar) convertView.findViewById(R.id.valueNote);
sb.setVisibility(View.VISIBLE);
sb.setTag(idField);
if (!currVal.equals("err"))
sb.setProgress(Integer.valueOf(currVal));
sb.setOnSeekBarChangeListener(this);
// Log.w("Curr value of SEEKBAR: " + idField, currVal);
} else {
SeekBar sb = (SeekBar) convertView.findViewById(R.id.valueNote);
sb.setVisibility(View.GONE);
sb.setTag(idField);
ViewGroup r = (ViewGroup) sb.getParent();
TextView sbDisp = (TextView) r.findViewById(R.id.valueNoteDisp);
sbDisp.setVisibility(View.GONE);
}
// _________________________________
// ________________________ Radio
// _________________________________
if (type.equals("Radio")) {
RadioGroup rg = (RadioGroup) convertView.findViewById(R.id.valueRadio);
rg.removeAllViewsInLayout();
rg.setTag(idField);
rg.setOnCheckedChangeListener(this);
ArrayList<String> al = H.getFieldValues(context, idField);
Iterator<String> itr = al.iterator();
// Log.w("Curr value of RADIO: " + idField, currVal);
while (itr.hasNext()) {
String val = itr.next();
String[] valData = val.split("##");
// Log.w("VALUES FIELD: " + idField, val + "## 0: " + valData[0]
// + " --1:" + valData[1]);
RadioButton tempRB = new RadioButton(context);
tempRB.setText(valData[1]);
tempRB.setTag(valData[0]);
// --init val
if (currVal.equals(valData[0]))
tempRB.setChecked(true);
else
tempRB.setChecked(false);
// --init color
tempRB.setTextColor(Color.BLUE);
LinearLayout.LayoutParams layoutParams = new RadioGroup.LayoutParams(RadioGroup.LayoutParams.WRAP_CONTENT, RadioGroup.LayoutParams.WRAP_CONTENT);
rg.addView(tempRB, 0, layoutParams);
}
rg.setVisibility(View.VISIBLE);
} else {
RadioGroup rg = (RadioGroup) convertView.findViewById(R.id.valueRadio);
rg.setVisibility(View.GONE);
rg.removeAllViewsInLayout();
}
// _________________________________
// ________________________CHECKBOX
// _________________________________
if (type.equals("Booleen")) {
CheckBox cb = (CheckBox) convertView.findViewById(R.id.valueBooleen);
// Log.w("Curr value of CHECKBOXX: " + idField, currVal);
cb.setVisibility(View.VISIBLE);
cb.setTag(idField);
cb.setOnCheckedChangeListener(this);
if (currVal.equals("1"))
cb.setChecked(true);
else
cb.setChecked(false);
} else {
CheckBox cb = (CheckBox) convertView.findViewById(R.id.valueBooleen);
cb.setVisibility(View.INVISIBLE);
}
return (convertView);
}
// checkbox listeners
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// Log.w("Check box-is position", String.valueOf(isChecked) +
// " - FieldId= " + buttonView.getTag());
H.saveData(context, buttonView.getTag().toString(), isChecked ? "1" : "0", idForm);
}
// seekbar listeners
public void onStartTrackingTouch(SeekBar seekBar) {
ViewGroup r = (ViewGroup) seekBar.getParent();
TextView sbDisp = (TextView) r.findViewById(R.id.valueNoteDisp);
sbDisp.setVisibility(View.VISIBLE);
}
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
H.saveData(context, seekBar.getTag().toString(), String.valueOf(progress), idForm);
}
public void onStopTrackingTouch(SeekBar seekBar) {
ViewGroup r = (ViewGroup) seekBar.getParent();
TextView sbDisp = (TextView) r.findViewById(R.id.valueNoteDisp);
sbDisp.setVisibility(View.VISIBLE);
sbDisp.setText(String.valueOf(seekBar.getProgress()));
notifyDataSetChanged();
}
// radio listeners
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton rb = (RadioButton) group.findViewById(checkedId);
if (rb != null) {
H.saveData(context, group.getTag().toString(), rb.getTag().toString(), idForm);
notifyDataSetChanged();
}
}
// date listeners
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
String dateVal = String.valueOf(dayOfMonth) + "/" + String.valueOf(monthOfYear + 1) + "/" + String.valueOf(year);
H.saveData(context, view.getTag().toString(), dateVal, idForm);
// Log.w("onDateChanged", "- " + view.getTag().toString());
}
}
这是我的项目自定义：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:background="@drawable/lv_bg_smart_form" android:minHeight="60px"
android:layout_height="wrap_content">
<TextView android:text="TextView" android:id="@+id/fieldName"
android:textColor="#000000" android:textSize="18dip"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_marginLeft="10px" android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"></TextView>
<!-- ________________________________________________________ -->
<EditText android:layout_width="fill_parent" android:id="@+id/fieldId"
android:layout_height="0dip" android:visibility="invisible" />
<EditText android:layout_width="fill_parent" android:id="@+id/formId"
android:layout_height="0dip" android:visibility="invisible" />
<EditText android:layout_width="fill_parent" android:id="@+id/fieldHint"
android:layout_height="0dip" android:visibility="invisible" />
<EditText android:layout_width="fill_parent" android:id="@+id/fieldType"
android:layout_height="0dip" android:visibility="invisible" />
<!-- //Text, Date, , Numeric |||| Note |||| Radio |||| Booleen -->
<!-- =========================================================== -->
<!-- =========================================================== -->
<!-- =========================================================== -->
<!-- =========================================================== -->
<CheckBox android:layout_height="wrap_content" android:id="@+id/valueBooleen"
android:layout_width="wrap_content" android:visibility="invisible"
android:layout_marginRight="20px" android:text=""
android:layout_below="@+id/fieldName" android:layout_alignParentRight="true"></CheckBox>
<RadioGroup android:layout_height="wrap_content" android:id="@+id/valueRadio"
android:layout_marginRight="20px" android:visibility="invisible"
android:layout_width="wrap_content" android:layout_below="@+id/fieldName"
android:layout_alignParentRight="true">
</RadioGroup>
<SeekBar android:id="@+id/valueNote" android:max="100"
android:progressDrawable="@drawable/seekbar_progress" android:thumb="@drawable/seek_thumb_normal"
android:layout_height="wrap_content" android:layout_marginRight="20px"
android:layout_below="@+id/fieldName" android:layout_alignParentRight="true"
android:layout_width="400px">
</SeekBar>
<TextView android:text="" android:id="@+id/valueNoteDisp"
android:textColor="#555599" android:textSize="12dip"
android:visibility="invisible" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_marginLeft="10px"
android:layout_alignParentLeft="true"
android:layout_alignParentBottom="true"></TextView>
<EditText android:inputType="textMultiLine"
android:layout_width="400px" android:id="@+id/valueText"
android:layout_marginRight="20px" android:layout_below="@+id/fieldName"
android:layout_alignParentRight="true" android:layout_height="90px"
android:visibility="invisible">
</EditText>
<DatePicker android:id="@+id/valueDate" android:visibility="invisible"
android:layout_marginRight="5px" android:layout_height="wrap_content"
android:layout_alignParentRight="true" android:layout_alignParentTop="true"
android:layout_width="wrap_content"></DatePicker>
</RelativeLayout>
请帮忙。