Android(安卓)最强工具类的使用 .blankj:utilcode

一, 引入

点击打开链接

这几天项目要做sharedprefences , 原生的写的很麻烦 , 于是用 utilcode , 来保存, 坑爹的是找到了 , 都不会用

compile 'com.blankj:utilcode:1.13.5'

二,初试直接报错

spUtils = SPUtils.getInstance(SPUTILS);

Caused by: java.lang.NullPointerException: u should init first
at com.blankj.utilcode.util.Utils.getApp(Utils.java:98)
at com.blankj.utilcode.util.SPUtils.(SPUtils.java:53)

at com.blankj.utilcode.util.SPUtils.getInstance(SPUtils.java:46)

at com.shinelon.sputils_boke.MainActivity.onCreate(MainActivity.java:30)

at android.app.Activity.performCreate(Activity.java:6237)

一看知道了是空指针的问题

三.分错

分析错误可以得出是要进行实例化的来的

Utils.init(this);spUtils = SPUtils.getInstance(SPUTILS);

package com.shinelon.sputils_boke;import android.app.Application;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.EditText;import android.widget.TextView;import com.blankj.utilcode.util.SPUtils;import com.blankj.utilcode.util.Utils;import butterknife.BindView;import butterknife.ButterKnife;import butterknife.OnClick;public class MainActivity extends AppCompatActivity {    @BindView(R.id.et_save)    EditText etSave;    @BindView(R.id.tv_show)    TextView tvShow;    private static final String SPUTILS = "sputils";    private SPUtils spUtils;    private Application app;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        Utils.init(this);        spUtils = SPUtils.getInstance(SPUTILS);    }    @OnClick({R.id.bt_save, R.id.bt_read})    public void onViewClicked(View view) {        switch (view.getId()) {            case R.id.bt_save:                spUtils.put("save",etSave.getText().toString());                break;            case R.id.bt_read:                tvShow.setText(spUtils.getString("save"));                break;        }    }}

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