存储 SP存储

    public void save(View view) {
        //获取Editor
        SharedPreferences.Editor editor = sp.edit();
        //获取key和value
        String key = keyTextView.getText().toString();
        String value = valueTextView.getText().toString();
        //保存
        editor.putString(key,value).commit();
        //给出提示
        Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();
    }

    public void read(View view) {
        //获得key
        String key = keyTextView.getText().toString();
        //获取value
        String value= sp.getString(key,null);
        //处理获得的value
        if(value!=null){
            valueTextView.setText(value);
        }else{
            Toast.makeText(this,"key不存在",Toast.LENGTH_SHORT).show();
        }
    }