使用SharedPreferences保存和读取数据

• 代码很简单

tSave.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {        SharedPreferences sp=getSharedPreferences("spTest", Context.MODE_PRIVATE);        SharedPreferences.Editor edit=sp.edit();        edit.putString("userName",etUser.getText().toString());        edit.commit();        Toast.makeText(v.getContext(),"保存成功",Toast.LENGTH_SHORT).show();    }});btRead.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {        SharedPreferences sp=getSharedPreferences("spTest", Context.MODE_PRIVATE);        String name=sp.getString("userName","没有数据");        showInfo.setText(name);    }});