android手机内存中的文件操作

android为手机存储范围内的文件操作提供了openFileOutput和openFileInput API,对文件操作提供了便利，一下是一个小demo，供参考学习使用

main activity

package com.opfiletext.example;import java.io.IOException;import com.opfiletext.service.FileService;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private EditText edit_filename, edit_filecontent;private Button submit, read;private TextView tv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                edit_filename = (EditText)findViewById(R.id.filename);        edit_filecontent = (EditText)findViewById(R.id.finecontent);        tv = (TextView)findViewById(R.id.tv);                submit = (Button)findViewById(R.id.submit);        submit.setOnClickListener(new SubminOnClickListener());            read = (Button)findViewById(R.id.read);        read.setOnClickListener(new ReadOnClickListener());    }            private final class SubminOnClickListener implements View.OnClickListener{@Overridepublic void onClick(View v) {String filename = edit_filename.getText().toString();String filecontent = edit_filecontent.getText().toString();FileService fm = new FileService(MainActivity.this);try {fm.save(filename, filecontent);Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_SHORT).show();} catch (IOException e) {Toast.makeText(MainActivity.this, "保存失败", Toast.LENGTH_SHORT).show();e.printStackTrace();}}    }        private final class ReadOnClickListener implements View.OnClickListener{@Overridepublic void onClick(View v) {String filename = edit_filename.getText().toString();FileService fm = new FileService(MainActivity.this);try {String content = fm.read(filename);tv.setText(content);} catch (IOException e) {tv.setText("解析异常");e.printStackTrace();}}    }}

service class

package com.opfiletext.service;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import android.content.Context;public class FileService {private Context context;public FileService(Context context) {this.context = context;}public void save(String filename, String filecontent) throws IOException {FileOutputStream fos = context.openFileOutput(filename, Context.MODE_PRIVATE);fos.write(filecontent.getBytes());fos.close();}public String read(String filename) throws IOException{FileInputStream fis = context.openFileInput(filename);ByteArrayOutputStream baos = new ByteArrayOutputStream();byte[] b = new byte[1024];int len = 0;while((len = fis.read(b)) > 0){baos.write(b, 0, len);}byte[] data = baos.toByteArray();return new String(data);}}

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