android 存储

package com.example.asus.sharedpreferences;

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

public class Main2Activity extends AppCompatActivity implements View.OnClickListener {

    private EditText name;
    private EditText password;
    private Button zc_bt;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
    }

    private void initView() {
        name = (EditText) findViewById(R.id.name);
        password = (EditText) findViewById(R.id.password);
        zc_bt = (Button) findViewById(R.id.zc_bt);

        zc_bt.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.zc_bt:
                String trim = name.getText().toString().trim();
                String trim1 = password.getText().toString().trim();
                //存储
                SharedPreferences sp = getSharedPreferences("sp", 0);
                SharedPreferences.Editor edit = sp.edit();
                edit.putString("name",trim);
                edit.putString("password",trim1);
                edit.commit();
                //跳转
                Intent intent = new Intent(this, MainActivity.class);
                startActivity(intent);
                break;
        }
    }
}

　　

package com.example.asus.sharedpreferences;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText name;
    private EditText password;
    private Button dl_btn;
    private Button zc_btn;
    private LinearLayout activity_main;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        name = (EditText) findViewById(R.id.name);
        password = (EditText) findViewById(R.id.password);
        dl_btn = (Button) findViewById(R.id.dl_btn);
        zc_btn = (Button) findViewById(R.id.zc_btn);
        activity_main = (LinearLayout) findViewById(R.id.activity_main);

        dl_btn.setOnClickListener(this);
        zc_btn.setOnClickListener(this);
        //存储
        SharedPreferences sp = getSharedPreferences("sp", 0);
        if (sp!=null){
            //获取
            String name1 = sp.getString("name", "");
            String password1 = sp.getString("password", "");
            //放入
            name.setText(name1);
            password.setText(password1);
        }
        
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.dl_btn:

                break;
            case R.id.zc_btn:
                Intent intent = new Intent(this, Main2Activity.class);
                startActivity(intent);
                break;
        }
    }

}