[游戏开发]安卓SharedPreferences保存数据（用对象存储）

一：public class HistoryBean implements Serializable {
//新建一个类存放属性
private double forwardLimit;
private double backwardLimit;
private double forwardCriticalPoint;

  public double getForwardLimit() 
  {
    return forwardLimit;
}

public void setForwardLimit(double forwardLimit)
 {
    this.forwardLimit = forwardLimit;
}

public double getBackwardLimit() {
return backwardLimit;
}

public void setBackwardLimit(double backwardLimit) {
    this.backwardLimit = backwardLimit;
}

public double getForwardCriticalPoint() {
    return forwardCriticalPoint;
}

public void setForwardCriticalPoint(double forwardCriticalPoint) {
    this.forwardCriticalPoint = forwardCriticalPoint;
}
}
二：public class MainActivity extends AppCompatActivity implements View.OnClickListener, View.OnTouchListener {
 private SharedPreferences pref;
  HistoryBean historyBean =  new  HistoryBean();

public void handleMessage(@NonNull Message msg) {
Gson gson = new Gson();
SharedPreferences.Editor historyData = getSharedPreferences(“historyData”,MODE_PRIVATE).edit();

        SharedPreferences.Editor  historyData = getSharedPreferences("historyData",MODE_PRIVATE).edit();   //调用SharedPreferences对象来获取SharePreferences对象
        super.handleMessage(msg);
        switch (msg.what) {
            case 0:
                edt_data.append(spMsg);
                dataNum++;
                if (dataNum > 300) {
                    edt_data.getText().clear();
                    dataNum = 0;
                }
                break;
            case 1:       
                if (item == 3) {
                    if (page == 1) {
                        tv_spmad.setText("AD:" + b3);
                        if (type == 1) {                        
                                tv_spmqj.setText("设定值:" + b1);
     
                        }
                        if (type == 2) {                        
                                tv_spmdj.setText("设定值:" + b2);
                                historyBean.setBackwardLimit(b2);          //存入                                                                 
                        }
                    }                  
         String jsonStr = gson.toJson(historyBean);            //将对象转成Json
        historyData.putString("fast",jsonStr);                //将json存进去
        historyData.commit();                                 //提交

}
三： @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
hideBottomUIMenu();
getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(
new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
hideBottomUIMenu(); //Android隐藏虚拟菜单
}
});
setContentView(R.layout.activity_main);
pref = getSharedPreferences(“historyData”,MODE_PRIVATE);
initView();
initData();
initEvent();
historyData();
}

四： private void historyData() {
HistoryBean historyBean1 = null;
String str = pref.getString(“fast”,""); //取出json
if(!TextUtils.isEmpty(pref.getString(“fast”,""))){
historyBean1 = new Gson().fromJson(str,HistoryBean.class); //将json转为对象
his_too.setText(“历史值:” + historyBean1.getForwardLimit());
his_tfo.setText(“历史值:” + historyBean1.getForwardCriticalPoint());
his_tft.setText(“历史值:” + historyBean1.getReverseCriticalPoint());
his_tot.setText(“历史值:” + historyBean1.getBackwardLimit());

        his_too2.setText("历史值" + historyBean1.getForwardLimit2());       
        his_tfo2.setText("历史值" + historyBean1.getForwardCriticalPoint2());
        his_tft2.setText("历史值" + historyBean1.getReverseCriticalPoint2());
        his_tot2.setText("历史值" + historyBean1.getBackwardLimit2());
        }
        }