?? myrecord.java
字號:
package demo;
import javax.microedition.lcdui.Graphics;
import javax.microedition.rms.RecordStore;
public class MyRecord{
private int m_nCurRecord = 0; //當前得分
private int m_nHighRecord = 0; //歷史最高得分
private String m_strName; //RMS系統中數據表的名稱
//構造方法,參數strName為存儲數據的表單名稱
public MyRecord( String strName ){
m_strName = strName;
Load();
}
//獲取當前得分
public int getCurRecord(){
return m_nCurRecord;
}
//設置當前得分
public void setCurRecord( int record ){
m_nCurRecord = record;
//如果當前得分高于歷史最高分,則保存
if( m_nHighRecord < m_nCurRecord ){
m_nHighRecord = m_nCurRecord;
Save();
}
}
//存儲歷史最高分
public void Save(){
try{
byte b[] = new byte[4];
int temp = m_nHighRecord;
//將int型數據,保存到byte數組
for(int i = b.length - 1; i >= 0; i--){
b[i] = new Integer(temp & 0xff).byteValue();
temp = temp >> 8;
}
//打開RecordStore,沒有則新建
RecordStore rs = RecordStore.openRecordStore(
m_strName,true);
if( rs.getNumRecords() > 0 ){ //如果記錄數大于0
rs.setRecord(1, b, 0, b.length); //更改第一條記錄
}
else{
//如果沒有記錄,則添加記錄
rs.addRecord(b,0,b.length);
}
rs.closeRecordStore();
}
catch (Exception ex){}
}
//讀取歷史最高分
public boolean Load(){
try{
RecordStore rs =
RecordStore.openRecordStore( m_strName, false);
byte b[] = rs.getRecord(1);
m_nHighRecord = 0;
for (int i = 0; i < 3; i++){
//如果b[i]小于0,則將b[i]轉換成相應的正數
if( b[i] < 0 )
m_nHighRecord += ( b[i] + 256 );
else
m_nHighRecord += b[i];
m_nHighRecord *= 256;
}
m_nHighRecord += b[3];
if( b[3] < 0 )
m_nHighRecord += 256;
rs.closeRecordStore();
}
catch (Exception ex){
return false;
}
return true;
}
//顯示歷史最高分記錄
//參數g對應手機屏幕,scrWidth與scrHeight分別是屏幕的寬與高
public void Paint( Graphics g, int scrWidth, int scrHeight ){
StringBuffer buffer = new StringBuffer();
buffer.append("歷史最高分:");
buffer.append(m_nHighRecord);
int x = scrWidth / 2;
int y = scrHeight / 2 - 20;
g.drawString(buffer.toString(), x, y,
Graphics.TOP|Graphics.HCENTER );
buffer.delete(0,buffer.length());
buffer.append("本次得分:");
buffer.append(m_nCurRecord);
y = y + 40;
g.drawString(buffer.toString(), x, y,
Graphics.TOP|Graphics.HCENTER );
}
}
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