前言
android读取文件中文出现乱码的原因无非就是，读取文件的字符格式与写如文件的格式不一致。因此，避免中文乱码，要在写入文件的时候按照一定的格式写入，读取的时候按照一定的格式读取。这样对应就不会出现乱码。对于其它的文本读取，在不知道何种格式的时候，可以先读取相应的文件信息，再进行相应的转码。
下面是一个避免中文读写出现乱码的类。
RWFile.java
package com.rwfile.main;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import android.os.Environment;
public class RWFile {
/**
* 判断sdcard是否存在
*
* @return
*/
public static boolean isSdcard() {
String status = Environment.getExternalStorageState();
if (status.equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}
/**
* 读取文件内容
*
* @param filePathAndName
* @return
*/
public static String readFile(String filePathAndName) {
String fileContent = null;
try {
File f = new File(filePathAndName);
if (f.isFile() && f.exists()) {
fileContent = "";
InputStreamReader read = new InputStreamReader(
new FileInputStream(f), "UTF-8");
BufferedReader reader = new BufferedReader(read);
String line;
while ((line = reader.readLine()) != null) {
fileContent += line;
}
read.close();
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return fileContent;
}
/**
* 写入文件内容
*
* @param filePathAndName
* @param fileContent
*/
public static boolean writeFile(String filePathAndName, String fileContent) {
try {
File f = new File(filePathAndName);
if (!f.exists()) {
f.createNewFile();
}
// 覆盖文件
OutputStreamWriter write = new OutputStreamWriter(
new FileOutputStream(f), "UTF-8");// 覆盖文件
// 追加文件
// OutputStreamWriter write = new OutputStreamWriter(
// new FileOutputStream(f, true), "UTF-8"); // 追加文件
BufferedWriter writer = new BufferedWriter(write);
writer.write(fileContent);
writer.close();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
}
根据这个类写的一个测试的Demo项目。
MainActivity.java
package com.rwfile.main;
import java.io.File;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText input = (EditText) findViewById(R.id.input);
final TextView content = (TextView) findViewById(R.id.content);
Button write = (Button) findViewById(R.id.write);
write.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (!RWFile.isSdcard()) {
Toast.makeText(MainActivity.this, "无法找到sdcard卡",
Toast.LENGTH_LONG).show();
} else {
String sdcard = Environment.getExternalStorageDirectory()
.toString() + File.separator;
System.out.println("write path:" + sdcard + "test.txt");
RWFile.writeFile(sdcard + "test.txt", input.getText()
.toString());
}
}
});
Button read = (Button) findViewById(R.id.read);
read.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (!RWFile.isSdcard()) {
Toast.makeText(MainActivity.this, "无法找到sdcard卡",
Toast.LENGTH_LONG).show();
} else {
String sdcard = Environment.getExternalStorageDirectory()
.toString() + File.separator;
System.out.println("read path:" + sdcard + "test.txt");
String str = RWFile.readFile(sdcard + "test.txt");
if (str == null)
Toast.makeText(MainActivity.this, "无法找到test.txt文件",
Toast.LENGTH_LONG).show();
else {
content.setText(str);
}
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
activy_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/input" /> <EditText android:id="@+id/input" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/chinese" android:text="@string/chinese"/> <Button android:id="@+id/write" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/write"/> <Button android:id="@+id/read" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/read"/> <TextView android:id="@+id/content" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>
注意：需要加入文件读写权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
避免读写中文乱码
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对脚本之家的支持。
