缓存基础类

import android.content.Context;

import android.content.SharedPreferences;

public class CacheParam {

/**

• 得到缓存的值*/

  public static boolean getkey(Context context,String key) {

  //context.getSharedPreferences第一个参数文件名，第二个是设置访问权限 私有化 仅限本程序访问

  SharedPreferences sharedPreferences = context.getSharedPreferences("setting", Context.MODE_PRIVATE);

  //第一个参数是key 第二个参数为 找不到key 的时候的默认值

  return sharedPreferences.getBoolean(key, false);

  }

  /**

• 保存缓存值*/

  public static void setkey(Context context,String key,boolean defaultvalue)

  {

  SharedPreferences sharedPreferences = context.getSharedPreferences("setting", Context.MODE_PRIVATE);

  sharedPreferences.edit().putBoolean(key,defaultvalue).commit();

  }

  public static void setkeyforstring(Context context,String key,String string)

  {

  SharedPreferences sharedPreferences = context.getSharedPreferences("setting", Context.MODE_PRIVATE);

  sharedPreferences.edit().putString(key,string).commit();

  }

  public static String getkeyforstring(Context context,String key) {

  //context.getSharedPreferences第一个参数文件名，第二个是设置访问权限 私有化 仅限本程序访问

  SharedPreferences sharedPreferences = context.getSharedPreferences("setting", Context.MODE_PRIVATE);

  //第一个参数是key 第二个参数为 找不到key 的时候的默认值

  return sharedPreferences.getString(key, "");

  }

  public static void clear(Context context) {

  SharedPreferences preferences = context.getSharedPreferences("setting", Context.MODE_PRIVATE);

  SharedPreferences.Editor editor = preferences.edit();

  editor.clear();

   editor.commit();

  }

}

基础类的调用

void getckpwd() {

if (checkBox.isChecked()) {

String struser = etname.getText().toString();

String strpwd = etpwd.getText().toString();

CacheParam.setkeyforstring(LogInActivity.this, "ischeck", "1");

CacheParam.setkeyforstring(LogInActivity.this, "username", struser);

CacheParam.setkeyforstring(LogInActivity.this, "userpwd", strpwd);

// Toast.makeText(getApplicationContext(), "1", Toast.LENGTH_SHORT).show();

} else {

CacheParam.clear(LogInActivity.this);

// Toast.makeText(getApplicationContext(), "0", Toast.LENGTH_SHORT).show();

}

}

String GetUser, GetPwd, GetCheck;

GetCheck = CacheParam.getkeyforstring(LogInActivity.this, "ischeck");

GetUser = CacheParam.getkeyforstring(LogInActivity.this, "username");

GetPwd = CacheParam.getkeyforstring(LogInActivity.this, "userpwd");

    //java中判断字符串是否相同 不能用==
    if (GetCheck.equals("1")) {
        checkBox.setChecked(true);
        if (GetUser != "") {
            etname.setText(GetUser);
        }
        if (GetPwd != "") {
            etpwd.setText(GetPwd);
        }
    } else {
        checkBox.setChecked(false);
    }