判断用户是否已经登录

BaseActivity

public abstract class BaseActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(getLayoutId());
        ButterKnife.bind(this);

        //将当前的activity添加到ActivityManager中
        ActivityManager.getInstance().add(this);

        initTitle();

        initData();

    }

    protected abstract void initData();

    protected abstract void initTitle();

    protected abstract int getLayoutId();

    public AsyncHttpClient client = new AsyncHttpClient();

    //启动新的activity
    public void goToActivity(Class Activity,Bundle bundle){
        Intent intent = new Intent(this,Activity);
        //携带数据
        if(bundle != null && bundle.size() != 0){
            intent.putExtra("data",bundle);
        }

        startActivity(intent);
    }

    //销毁当前的Activity
    public void removeCurrentActivity(){
        ActivityManager.getInstance().removeCurrent();
    }

    //销毁所有的activity
    public void removeAll(){
        ActivityManager.getInstance().removeAll();
    }

    //保存用户信息
    public void saveUser(User user){
        SharedPreferences sp = this.getSharedPreferences("user_info", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.putString("name",user.getName());
        editor.putString("imageurl",user.getImageurl());
        editor.putBoolean("iscredit", user.isCredit());
        editor.putString("phone",user.getPhone());
        editor.commit();//必须提交，否则保存不成功
    }

    //读取用户信息
    public User readUser(){
        SharedPreferences sp = this.getSharedPreferences("user_info", Context.MODE_PRIVATE);
        User user = new User();
        user.setName(sp.getString("name",""));
        user.setImageurl(sp.getString("imageurl", ""));
        user.setPhone(sp.getString("phone", ""));
        user.setCredit(sp.getBoolean("iscredit",false));

        return user;
    }
}

　　

用户信息界面：--读取用户

1.判断用户是否已经登录

private void isLogin() {
    //查看本地是否有用户的登录信息
    SharedPreferences sp = this.getActivity().getSharedPreferences("user_info", Context.MODE_PRIVATE);
    String name = sp.getString("name", "");
    if(TextUtils.isEmpty(name)){
        //本地没有保存过用户信息，给出提示：登录
        doLogin();

    }else{
        //已经登录过，则直接加载用户的信息并显示
        doUser();
    }

}

2.给出提示：登录

private void doLogin() {
    new AlertDialog.Builder(this.getActivity())
                .setTitle("提示")
                .setMessage("您还没有登录哦！么么~")
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
//                            UIUtils.toast("进入登录页面",false);
                        ((BaseActivity) MeFragment.this.getActivity()).goToActivity(LoginActivity.class, null);
                    }
                })
                .setCancelable(false)
                .show();
}

3.加载用户信息并显示

private void doUser() {

    //1.读取本地保存的用户信息
    User user = ((BaseActivity) this.getActivity()).readUser();
    //2.获取对象信息，并设置给相应的视图显示。
    tvMeName.setText(user.getName());

    //判断本地是否已经保存头像的图片，如果有，则不再执行联网操作
    boolean isExist = readImage();
    if(isExist){
        return;
    }

    //使用Picasso联网获取图片
    Picasso.with(this.getActivity()).load(user.getImageurl()).transform(new Transformation() {
        @Override
        public Bitmap transform(Bitmap source) {//下载以后的内存中的bitmap对象
            //压缩处理
            Bitmap bitmap = BitmapUtils.zoom(source, UIUtils.dp2px(62),UIUtils.dp2px(62));
            //圆形处理
            bitmap = BitmapUtils.circleBitmap(bitmap);
            //回收bitmap资源
            source.recycle();
            return bitmap;
        }

        @Override
        public String key() {
            return "";//需要保证返回值不能为null。否则报错
        }
    }).into(ivMeIcon);


    //判断一下，是否开启了手势密码。如果开启：先输入手势密码
    SharedPreferences sp = this.getActivity().getSharedPreferences("secret_protect", Context.MODE_PRIVATE);
    boolean isOpen = sp.getBoolean("isOpen", false);
    if(isOpen){
        ((BaseActivity)this.getActivity()).goToActivity(GestureVerifyActivity.class,null);
        return;
    }
}

　　

登入用户--保存

LoginActivity

@OnClick(R.id.btn_login)
public void login(View view){//登录按钮的点击事件
    String number = etLoginNumber.getText().toString().trim();
    String pwd = etLoginPwd.getText().toString().trim();
    if(!TextUtils.isEmpty(number) && !TextUtils.isEmpty(pwd)){
        String url = AppNetConfig.LOGIN;
        RequestParams params = new RequestParams();
        params.put("phone",number);
        params.put("password", MD5Utils.MD5(pwd));
        client.post(url,params,new AsyncHttpResponseHandler(){
            @Override
            public void onSuccess(String content) {//200 404
                //解析json
                JSONObject jsonObject = JSON.parseObject(content);
                boolean success = jsonObject.getBoolean("success");
                if(success){

                    //解析json数据，生成User对象
                    String data = jsonObject.getString("data");
                    User user = JSON.parseObject(data, User.class);

                    //保存用户信息
                    saveUser(user);
                    //重新加载界面
                    removeAll();
                    goToActivity(MainActivity.class,null);

                }else{
                    Toast.makeText(LoginActivity.this, "用户名不存在或密码不正确", Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Throwable error, String content) {
                UIUtils.toast("联网失败",false);

            }
        });
    }else{
        UIUtils.toast("用户名或密码不能为空", false);
    }
}