ListView의 배치 로드 및 페이지 로드
public class CallSafeActivity2 extends BaseActivity implements OnClickListener{
private TextView tv_title;
private ImageView iv_left;
private ImageView iv_right;
private ListView list_view;
private List mBlackNumbers;
//
private int pageSize=20;
//
private int mCurrentPage=0;
//
private int totalPage;
private EditText et_page;
private TextView current_count_page;
private BlackNumberDao dao;
/**
* UI
*/
@Override
protected void initUI() {
setContentView(R.layout.activity_call_safe2);
list_view = (ListView) findViewById(R.id.list_view);
et_page = (EditText) findViewById(R.id.et_page);
current_count_page = (TextView) findViewById(R.id.current_count_page);
}
/**
*
*/
@Override
protected void initTiltBar() {
tv_title = (TextView) findViewById(R.id.tv_title);
iv_left = (ImageView) findViewById(R.id.iv_left);
iv_right = (ImageView) findViewById(R.id.iv_right);
tv_title.setText(" ");
iv_left.setVisibility(View.INVISIBLE);
iv_right.setVisibility(View.VISIBLE);
iv_right.setOnClickListener(this);
}
/**
*
*/
@Override
protected void initData() {
dao = new BlackNumberDao(this);
// listView
//mBlackNumbers = dao.findAll();
//CallSafeAdapter adapter = new CallSafeAdapter(mBlackNumbers, this);
//list_view.setAdapter(adapter);
// ,totalPage ，mCurrentPage
totalPage = dao.getTotalNumber()/pageSize;
current_count_page.setText(mCurrentPage+"/"+(totalPage-1));
new Thread(){
public void run(){
//
mBlackNumbers= dao.findPar(pageSize, mCurrentPage);
handler.sendEmptyMessage(0);
}
}.start();
}
Handler handler=new Handler(){
public void handleMessage(Message msg) {
CallSafeAdapter adapter=new CallSafeAdapter(mBlackNumbers, CallSafeActivity2.this);
list_view.setAdapter(adapter);
};
};
/**
* listView
* @author dell
*
*/
private class CallSafeAdapter extends MyBaseAdapter<BlackNumber>{
//MyBaseAdapter
public CallSafeAdapter(List mLists, Context mContext) {
super(mLists, mContext);
}
private TextView tv_number;
private TextView tv_mode;
private ImageView iv_delete;
private View view;
private ViewHolder holder;
//listView
public View getView(int position, View convertView, ViewGroup parent) {
// convertView 200%， findViewById，pull
if (convertView==null) {
view = View.inflate(CallSafeActivity2.this, R.layout.item_call_safe, null);
//viewHold ， 50%， findViewById，
holder = new ViewHolder();
holder.tv_number = (TextView) view.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) view.findViewById(R.id.tv_mode);
holder.iv_delete = (ImageView) view.findViewById(R.id.iv_delete);
view.setTag(holder);
}else {
view=convertView;
holder = (ViewHolder) view.getTag();
}
holder.tv_number.setText(mLists.get(position).getNumber());
String mode = mLists.get(position).getMode();
if (mode.equals("1")) {
holder.tv_mode.setText(" ");
} else if (mode.equals("2")) {
holder.tv_mode.setText(" ");
} else if (mode.equals("3")) {
holder.tv_mode.setText(" ");
}
return view;
}
}
/**
* listView ， 50%。 findViewById ，
* @author dell
*
*/
static class ViewHolder{
TextView tv_number;
TextView tv_mode;
ImageView iv_delete;
}
public void onClick(View v) {
}
/**
*
*/
public void pre(View view){
if (mCurrentPage<=0) {
ToastUtils.showSafeToast(CallSafeActivity2.this, " ");
return;
}
mCurrentPage--;
initData();
}
/**
*
*/
public void next(View view){
if(mCurrentPage >= totalPage - 1 ){
ToastUtils.showSafeToast(CallSafeActivity2.this, " ");
return ;
}
mCurrentPage++;
initData();
}
/**
*
* @param view
*/
public void jump(View view){
String str_page = et_page.getText().toString().trim();
if(TextUtils.isEmpty(str_page)){
ToastUtils.showSafeToast(CallSafeActivity2.this, " ");
}else{
//
int number = Integer.parseInt(str_page);
//
if(number < 0 || number > totalPage - 1){
ToastUtils.showSafeToast(CallSafeActivity2.this, " ");
}else{
mCurrentPage = number;
initData();
}
}
}
} 해당 DAO 클래스:
public class BlackNumberDao {
private BlackNumberSQLiteOpenHelper helper;
private SQLiteDatabase db;
public BlackNumberDao(Context context) {
helper = new BlackNumberSQLiteOpenHelper(context);
}
/**
*
* @param number
* @param mode
* @return
*/
public boolean add(String number,String mode){
db = helper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put("number",number);
values.put("mode", mode);
long rawId = db.insert("blacknumber", null, values);
if (rawId==-1) {
//
return false;
}else {
//
return true;
}
}
/**
*
* @param number
* @return
*/
public boolean delete(String number){
db = helper.getWritableDatabase();
int rowNumber = db.delete("blacknumber", "number=?", new String[]{number});
if (rowNumber==0) {
return false;
}else {
return true;
}
}
/**
*
* @param number
* @param newmode
* @return
*/
public boolean changeNumberMode(String number,String newmode){
db = helper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put("mode", newmode);
int rowNumber = db.update("blacknumber", values, "number=?", new String[]{number});
if (rowNumber == 0) {
return false;
} else {
return true;
}
}
/**
*
*
* @param number
* @return
*/
public String find(String number) {
String mode = "";
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = db.query("blacknumber", new String[] { "mode" },
"number=?", new String[] { number }, null, null, null);
if (cursor.moveToNext()) {
mode = cursor.getString(0);
}
cursor.close();
db.close();
return mode;
}
/**
*
* @return
*/
public List findAll(){
List list=new ArrayList();
db = helper.getWritableDatabase();
Cursor cursor = db.query("blacknumber", new String[]{"number","mode"}, null , null, null, null, null);
while (cursor.moveToNext()) {
BlackNumber blackNumber = new BlackNumber();
blackNumber.setNumber(cursor.getString(0));
blackNumber.setMode(cursor.getString(1));
list.add(blackNumber);
}
cursor.close();
db.close();
return list;
}
/**
*
* @param pageSize
* @param startIndex
* @return
*/
public List findPar(int pageSize,int startIndex){
List list = new ArrayList();
db = helper.getWritableDatabase();
Cursor cursor = db.rawQuery("select number,mode from blacknumber limit ? offset ?", new String[]{String.valueOf(pageSize),String.valueOf(startIndex*pageSize)});
while (cursor.moveToNext()) {
BlackNumber blackNumber = new BlackNumber();
blackNumber.setNumber(cursor.getString(0));
blackNumber.setMode(cursor.getString(1));
list.add(blackNumber);
}
cursor.close();
db.close();
return list;
}
/**
*
* @param pageSize
* @param startIndex
* @return
*/
public List findPar2(int pageSize,int startIndex){
List list = new ArrayList();
db = helper.getWritableDatabase();
Cursor cursor = db.rawQuery("select number,mode from blacknumber limit ? offset ?", new String[]{String.valueOf(pageSize),String.valueOf(startIndex)});
while (cursor.moveToNext()) {
BlackNumber blackNumber = new BlackNumber();
blackNumber.setNumber(cursor.getString(0));
blackNumber.setMode(cursor.getString(1));
list.add(blackNumber);
}
cursor.close();
db.close();
return list;
}
/**
*
* @return
*/
public int getTotalNumber(){
db = helper.getWritableDatabase();
Cursor cursor = db.rawQuery("select count(*) from blacknumber", null);
cursor.moveToNext();
int count = cursor.getInt(0);
cursor.close();
db.close();
return count;
}
} 2. 배치 로딩의 원리는 페이지 로딩의 원리와 같다. ListView가 아래와 같이 아래로 내려가는지 판단한 다음에 데이터를 로딩하는 것과 달리 리셋 과정이 있다. 코드는 다음과 같다.
설명: 세분화 로딩, setOnScrollListener 감청기 추가,listview.getLastVisiblePosition() 방법
public class CallSafeActivity extends BaseActivity implements OnClickListener{
private TextView tv_title;
private ImageView iv_left;
private ImageView iv_right;
private ListView list_view;
private List mBlackNumbers;
//
private int maxCount=20;
//
private int startIndex=0;
//
private int totalNumber;
private BlackNumberDao dao;
/**
* UI
*/
@Override
protected void initUI() {
setContentView(R.layout.activity_call_safe);
list_view = (ListView) findViewById(R.id.list_view);
list_view.setOnScrollListener(new OnScrollListener() {
// （ 。。。）
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
//
case OnScrollListener.SCROLL_STATE_FLING:
break;
//
case OnScrollListener.SCROLL_STATE_IDLE:
int lastVisiblePosition = list_view.getLastVisiblePosition();
//
if (lastVisiblePosition==mBlackNumbers.size()-1) {
//
startIndex+=maxCount;
if (startIndex>=totalNumber) {
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
return;
}
initData();
}
break;
//
case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
break;
default:
break;
}
}
//
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
}
});
}
/**
*
*/
@Override
protected void initTiltBar() {
tv_title = (TextView) findViewById(R.id.tv_title);
iv_left = (ImageView) findViewById(R.id.iv_left);
iv_right = (ImageView) findViewById(R.id.iv_right);
tv_title.setText(" ");
iv_left.setVisibility(View.INVISIBLE);
iv_right.setVisibility(View.VISIBLE);
//
iv_right.setOnClickListener(this);
}
/**
*
*/
@Override
protected void initData() {
dao = new BlackNumberDao(this);
// ,totalPage ，mCurrentPage
totalNumber = dao.getTotalNumber();
new Thread(){
public void run(){
// 。 20
if (mBlackNumbers==null) {
mBlackNumbers= dao.findPar2(maxCount, startIndex);
}else {
// ，
mBlackNumbers.addAll(dao.findPar2(maxCount, startIndex));
}
handler.sendEmptyMessage(0);
}
}.start();
}
private CallSafeAdapter adapter;
Handler handler=new Handler(){
public void handleMessage(Message msg) {
if (adapter==null) {
adapter = new CallSafeAdapter(mBlackNumbers, CallSafeActivity.this);
list_view.setAdapter(adapter);
}else {
//
adapter.notifyDataSetChanged();
}
};
};
private AlertDialog dialog;
/**
* listView
* @author dell
*
*/
private class CallSafeAdapter extends MyBaseAdapter<BlackNumber>{
//CallSafeAdapter
public CallSafeAdapter(List mLists, Context mContext) {
super(mLists, mContext);
}
private TextView tv_number;
private TextView tv_mode;
private ImageView iv_delete;
private View view;
private ViewHolder holder;
//listView
public View getView(final int position, View convertView, ViewGroup parent) {
// convertView 200%， findViewById，pull
if (convertView==null) {
view = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
//viewHold ， 50%， findViewById，
holder = new ViewHolder();
holder.tv_number = (TextView) view.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) view.findViewById(R.id.tv_mode);
holder.iv_delete = (ImageView) view.findViewById(R.id.iv_delete);
view.setTag(holder);
}else {
view=convertView;
holder = (ViewHolder) view.getTag();
}
holder.tv_number.setText(mLists.get(position).getNumber());
String mode = mLists.get(position).getMode();
if (mode.equals("1")) {
holder.tv_mode.setText(" ");
} else if (mode.equals("2")) {
holder.tv_mode.setText(" ");
} else if (mode.equals("3")) {
holder.tv_mode.setText(" ");
}
//
final String number = mLists.get(position).getNumber();
//
holder.iv_delete.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//
boolean result = dao.delete(number);
// true
if (result) {
//
mBlackNumbers.remove(position);
//
adapter.notifyDataSetChanged();
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
}else {
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
}
}
});
return view;
}
}
/**
* listView ， 50%。 findViewById ，
* @author dell
*
*/
static class ViewHolder{
TextView tv_number;
TextView tv_mode;
ImageView iv_delete;
}
/**
*
*/
@Override
public void onBackPressed() {
SystemInfo.startActivity(this, MainActivity.class);
super.onBackPressed();
}
/**
*
*/
public void onClick(View v) {
AlertDialog.Builder builder = new Builder(this);
final View view = View.inflate(this, R.layout.dialog_add_black_number, null);
//
final TextView et_number = (TextView) view.findViewById(R.id.et_number);
//
Button bt_ok = (Button) view.findViewById(R.id.bt_ok);
//
Button bt_cancel = (Button) view.findViewById(R.id.bt_cancel);
//
final CheckBox cb_phone = (CheckBox) view.findViewById(R.id.cb_phone);
//
final CheckBox cb_sms = (CheckBox) view.findViewById(R.id.cb_sms);
//
bt_cancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
dialog.dismiss();
}
});
//
bt_ok.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//
String str_number = et_number.getText().toString().trim();
// ，
if (TextUtils.isEmpty(str_number)) {
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
return;
}
/**
* 1 + ( ) 2 3
*/
String mode;
//
if (cb_phone.isChecked()&&cb_sms.isChecked()) {
//
mode="1";
}else if (cb_phone.isChecked()) {
//
mode="2";
}else if (cb_sms.isChecked()) {
//
mode="3";
}else{
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
return;
}
BlackNumber blackNumber = new BlackNumber();
blackNumber.setNumber(str_number);
blackNumber.setMode(mode);
// ——
boolean result = dao.add(str_number, mode);
// true ，
if (result) {
mBlackNumbers.add(0, blackNumber);
adapter.notifyDataSetChanged();
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
}else{
ToastUtils.showSafeToast(CallSafeActivity.this, " ");
}
dialog.dismiss();
}
});
builder.setView(view);
dialog = builder.show();
}
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