小组任务作业

1.布局代码 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:text="请输入姓名:"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="30sp"
        android:gravity="center"/>
    <EditText
        android:id="@+id/name"
        android:layout_width="0dp"
        android:textSize="25sp"
        android:layout_height="wrap_content"
        android:layout_weight="4"/>
</LinearLayout>
<TextView
        android:text="请输入年龄:"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="30sp"
        android:gravity="center"/>
    <EditText
        android:id="@+id/year"
        android:layout_width="0dp"
        android:textSize="25sp"
        android:layout_height="wrap_content"
        android:layout_weight="4"/>
</LinearLayout>

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

        <Button
            android:id="@+id/write"
            android:text="写入"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textSize="25sp"
           
            android:onClick="onClick"/>

        <Button
            android:id="@+id/read"
             android:text="读取"
             android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textSize="25sp"
          
            android:onClick="onClick"/>
    </LinearLayout>
 2.java代码
 public class MainActivity extends AppCompatActivity {

    private EditText name;
    private EditText year;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        name = (EditText) findViewById(R.id.name);
  
        year = (EditText) findViewById(R.id.year);
    }

    public void onClick(View view) {
        switch (view.getId()){
            case R.id.write:
                String name = name.getText().toString();
                String year = year.getText().toString();
                if(saveToPrefs(name,year)){
                    Toast.makeText(MainActivity.this,"写入完毕",Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.read:
                readFromPrefs();
                break;
        }
    }
   
    private void readFromPrefs() {
        SharedPreferences preferences = getSharedPreferences("customer.txt",MODE_PRIVATE);
        String name=preferences.getString("name","");
        String year=preferences.getString("year","");
        name.setText(name);
        year.setText(year);
    }
   
    private boolean saveToPrefs(String name, String year）{
        SharedPreferences preferences = MainActivity.this.getSharedPreferences("customer.txt",MODE_PRIVATE);
        SharedPreferences.Editor editor =preferences.edit();
        editor.putString("name",name);
        editor.putString("year",year);
        editor.commit();
        return true;
    }
}