android读取、写入文件
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android读取、写入文件
里面的源码是：
[code lang="java"]
package com.daozhao.android;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import android.content.Context;
public class FileService {
private Context context;
public FileService(Context context) {
this.context = context;
}
/**
* 一私有文件保存内容
* @param filename 文件名称
* @param content 文件内容
* @throws Exception
*/
public void save(String filename, String content) throws Exception {
FileOutputStream fos = context.openFileOutput(filename, Context.MODE_PRIVATE);
fos.write(content.getBytes());
fos.close();
}
/**
* 一读取文件内容
* @param filename 文件名称
* @param content 文件内容
* @throws Exception
*/
public String readFile(String filename) throws Exception {
FileInputStream fis = context.openFileInput(filename);
byte[] buffer = new byte[1024];
int len = 0;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while((len = fis.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
byte[] data = baos.toByteArray(); //得到文件的二进制数据
baos.close();
fis.close();
return new String(data);
}
}
[/code]
MainActivity.java是主Activity
源代码如下：
[code lang="java"]
package com.daozhao.android;
import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.util.Log;
import android.view.*;
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private FileService fs;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
fs = new FileService(this);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText fileName = (EditText) findViewById(R.id.filename);
EditText fileContent = (EditText) findViewById(R.id.filecontent);
String filename = fileName.getText().toString();
String filecontent = fileContent.getText().toString();
try {
fs.save(filename,filecontent);
//输出操作成功的信息
Toast.makeText(MainActivity.this, R.string.success, 1).show();
} catch(Exception e) {
Log.e(TAG, e.toString());
Toast.makeText(MainActivity.this, R.string.error, 1).show();
}
}
});
Button read = (Button) this.findViewById(R.id.read);
read.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText fileName = (EditText) findViewById(R.id.filename);
EditText fileContent = (EditText) findViewById(R.id.filecontent);
String filename = fileName.getText().toString();
String str = null;
String filecontent = fileContent.getText().toString();
try {
str = fs.readFile(filename);
fileContent.setText(str);
} catch(Exception e) {
Log.e(TAG, e.toString());
fileContent.setText("");
Toast.makeText(MainActivity.this, R.string.error, 1).show();
}
}
});
}
}
[/code]- 分类：
- Mobile
更新时间：
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