Shareprefrence

Xml文件

<?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="vertical"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="sharedpreference.zhangmeng.com.sharedpreference.MainActivity">

    <EditText
        android:id="@+id/et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
         />
    <Button
        android:id="@+id/bt_saveData"
        android:text="save data"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/bt_readData"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="read text"/>
</LinearLayout>

MainActivity

package sharedpreference.zhangmeng.com.sharedpreference;

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

public class MainActivity extends AppCompatActivity {

private EditText et=null;
    private SharedPreferences.Editor editor=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText)findViewById(R.id.et);
        findViewById(R.id.bt_saveData).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editor=getSharedPreferences("data",MODE_PRIVATE).edit();
                editor.putString("name",et.getText().toString());
                editor.commit();
                Toast.makeText(getApplicationContext(),"The data saved.",Toast.LENGTH_LONG).show();
            }
        });

        findViewById(R.id.bt_readData).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences pref=getSharedPreferences("data",MODE_PRIVATE);

                Toast.makeText(getApplicationContext(),pref.getString("name",""),Toast.LENGTH_LONG).show();
            }
        });
    }
}