android （神TM）存储与读取

来源：互联网发布：wpx软件是什么编辑：程序博客网时间：2024/05/17 20:31

界面一个EditText，一个Button，其他随意。

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;import com.example.bz0209.myapplication.model.FileService;public class MainActivity extends AppCompatActivity {    private EditText edit;    private FileService fs;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        fs = new FileService(this);        edit = (EditText)findViewById(R.id.editText);        edit.setText(fs.Read());    }    public void OnSave(View view){        fs.Save(edit.getText().toString());        Toast.makeText(this,"ok", Toast.LENGTH_LONG).show();    }}

关键是这个class，因为android的文件读写方式和java貌似还是不一样……
(敲桌子，划重点~)那两层包装，只为了不用隐式转换而用那个能直接得到相同类型的方法。

import android.content.Context;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;/** * Created by Administrator on 2017/4/10. */public class FileService {    private Context context;    public FileService(Context context){        this.context = context;    }    public boolean Save(String content){        FileOutputStream fos = null;        OutputStreamWriter osw = null;        BufferedWriter bw = null;        try {            /*1:文件名，2:操作模式*/            fos = context.openFileOutput("data.txt", Context.MODE_PRIVATE);//得到文件输出流            osw = new OutputStreamWriter(fos);            bw = new BufferedWriter(osw);//包装            bw.write(content);            return true;        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }finally {            try{                if(bw != null)                    bw.close();                if (osw != null)                    osw.close();                if(bw != null)                    bw.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return false;    }    public String Read(){        FileInputStream fis = null;        InputStreamReader isr = null;        BufferedReader wr = null;        String content = null;        try {            fis = context.openFileInput("data.txt");            isr = new InputStreamReader(fis);            wr = new BufferedReader(isr);            content = wr.readLine();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        finally {            try {                if(wr != null)                    wr.close();                if(isr != null)                    isr.close();                if(fis != null)                    fis.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return content;    }}

打开能显示之前保存的string，点击按钮能保存当前的string

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