android讀寫中文如何避免亂碼詳解

2019-12-12 03:11:56

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前言

android讀取文件中文出現(xiàn)亂碼的原因無非就是，讀取文件的字符格式與寫如文件的格式不一致。因此，避免中文亂碼，要在寫入文件的時候按照一定的格式寫入，讀取的時候按照一定的格式讀取。這樣對應(yīng)就不會出現(xiàn)亂碼。對于其它的文本讀取，在不知道何種格式的時候，可以先讀取相應(yīng)的文件信息，再進行相應(yīng)的轉(zhuǎn)碼。

下面是一個避免中文讀寫出現(xiàn)亂碼的類。

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 {  /**  * 判斷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;  }  }  /**  * 讀取文件內(nèi)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;  }  /**  * 寫入文件內(nèi)容  *  * @param filePathAndName  * @param fileContent  */  public static boolean writeFile(String filePathAndName, String fileContent) {  try {  File f = new File(filePathAndName);  if (!f.exists()) {  f.createNewFile();  }  // 覆蓋文件  OutputStreamWriter write = new OutputStreamWriter(  new FileOutputStream(f), "UTF-8");// 覆蓋文件  // 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;  }  }

根據(jù)這個類寫的一個測試的Demo項目。

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, "無法找到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, "無法找到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, "無法找到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：需要加入文件讀寫權(quán)限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>

避免讀寫中文亂碼