数据储存方式

来源：互联网发布：单片机程序实验流程图编辑：程序博客网时间：2024/05/21 18:49

1.SharedPreferences的存储

package com.zking.administrator.g160628_android15_data;import android.content.Context;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 LoginActivity extends AppCompatActivity {    private EditText et_login_uname;    private EditText et_login_upass;    private SharedPreferences sp;    private SharedPreferences.Editor editor;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        et_login_uname = (EditText) findViewById(R.id.et_login_uname);        et_login_upass = (EditText) findViewById(R.id.et_login_upass);        sp = getSharedPreferences("loginInfo", Context.MODE_PRIVATE);        editor = sp.edit();        //获取数据        String uname=sp.getString("uname","");//从SharedPreferences里获取数据        String upass=sp.getString("upass","");        et_login_uname.setText(uname);        et_login_upass.setText(upass);    }    public void login(View view){        String uname=et_login_uname.getText().toString();        String upass=et_login_upass.getText().toString();        editor.putString("uname",uname);//保存到SharedPreferences中        editor.putString("upass",upass);        //细节：        editor.commit();    }}

2.I-0读写内部存储、外部存储的文件数据

package com.zking.administrator.g160628_android15_data;import android.content.Context;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class MainActivity extends AppCompatActivity {    private EditText et_main_content;    private EditText et_main_name;    private String sdCard;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        et_main_content = (EditText) findViewById(R.id.et_main_content);        et_main_name = (EditText) findViewById(R.id.et_main_name);        //获取手机内存卡的路径        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){            sdCard = Environment.getExternalStorageDirectory().getAbsolutePath();        }    }    public void save(View view){        String content=et_main_content.getText().toString();        String fileName=et_main_name.getText().toString();        //io        //写，输出流        try {            FileOutputStream fos=new FileOutputStream(sdCard+"/"+fileName);            fos.write(content.getBytes());            fos.close();            Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    public void read(View view){        String fileName=et_main_name.getText().toString();        //读：输入流        try {            FileInputStream fis=new FileInputStream(sdCard+"/"+fileName);            byte buf[]=new byte[1024];            int len=0;            StringBuffer s=new StringBuffer();            while((len= fis.read(buf))!=-1){                s.append(new String(buf,0,len));            }            et_main_content.setText(s);            fis.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

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