来来来，先看效果。

布局还是那么熟悉

<EditText
android:id="@+id/yf_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/edit1"/>



<EditText
android:id="@+id/yf_age"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/edit2"/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">



<Button
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_weight="1"
style="@style/button1"
android:onClick="onClick"
android:id="@+id/yf_button1"/>

<Button
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_weight="1"
style="@style/button2"
android:onClick="onClick"
android:id="@+id/yf_button2"/>

</LinearLayout>

</LinearLayout>

 布局大概是这个样子的

做的还是可以的

package hello.xingxibaocunduqu;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private EditText etname, etage;
    private String name, age;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        etname = (EditText) findViewById(R.id.name);
        etage = (EditText) findViewById(R.id.age);
    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.xieru:
                name = etname.getText().toString();
                age = etage.getText().toString();
                save(name,age);
                break;
            case R.id.duqu:
                readPrefs();
                break;
        }
    }

    private void save(String name, String age) {
        SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
        editor.putString("name", name);
        editor.putString("age",age);
        editor.commit();
        editor.clear();
        Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_LONG).show();
    }

    private void readPrefs() {
        SharedPreferences prefs = getSharedPreferences("data", MODE_PRIVATE);
        String username = prefs.getString("name", "");
        String userage = prefs.getString("age", "");
        Toast.makeText(MainActivity.this, "姓名是："+username+"年龄是："+userage, Toast.LENGTH_LONG).show();
    }
}
然后就是代码的实现
问我为什么这么简单
我才发现要交作业
然后时间不多了
所以就
还是可以的

SharedPreferences的制作