Android编程心得-使用Application类保存应用的全局数据
在实际应用我们经常需要对数据进行交互与保存，但Intent中默认的方法对传输数据是有类型限制的，当我们需要传输或保存一个复杂的泛型数据时，使用Application是一个很好的解决办法。
顾名思义，Application对应整个应用，就如Activity对应当前的活动窗口一样，当我们需要使用它的时候，一定要在AndroidManifest.xml中对它进行声明。
public class MeterApplication extends Application {private List<ReadyTask> DownloadList;private static MeterApplication instance;private HashMap<String, List<ReadyTask>> DownLoadResult; private List<String> UnitNumList;private String CurOPNUM; private boolean BlueConStatus;private int CurStauts; // 当前运行状态@Overridepublic void onCreate() {// TODO Auto-generated method stubinstance = this;DownloadList = new ArrayList<ReadyTask>();super.onCreate();}public boolean isBlueConStatus() {return BlueConStatus;}public void setBlueConStatus(boolean blueConStatus) {BlueConStatus = blueConStatus;}public List<String> getUnitNumList() {return UnitNumList;}public void setUnitNumList(List<String> unitNumList) {UnitNumList = unitNumList;}public HashMap<String, List<ReadyTask>> getDownLoadResult() {return DownLoadResult;}public void setDownLoadResult(HashMap<String, List<ReadyTask>> downLoadResult) {DownLoadResult = downLoadResult;}public static MeterApplication getInstance() {return instance;}public List<ReadyTask> getDownloadList() { //下载List的值return DownloadList;}public void setDownloadList(List<ReadyTask> downloadList) {DownloadList = downloadList;}public int getCurStauts() {return CurStauts;}public void setCurStauts(int curStauts) {CurStauts = curStauts;}public String getCurOPNUM() {return CurOPNUM;}public void setCurOPNUM(String curOPNUM) {CurOPNUM = curOPNUM;} }