文件编码的测试（android）

做了一个文件编码的测试，为下一个作品做准备,需要准备4个不同编码的文件

在 code 中已指明了文件名

xml 代码如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
   
    <TextView
        android:id="@+id/tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <TextView
        android:id="@+id/tv2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Button 
        android:id="@+id/btn_utf8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="utf8"
        />
    <Button 
        android:id="@+id/btn_un"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="unicode"
        />
    
    <Button 
        android:id="@+id/btn_ansi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ansi"
        />
    <Button 
        android:id="@+id/btn_bigunicode"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="bigunicode"
        />
</LinearLayout>

java 代码

package zziss.android.txt;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class TxttestActivity extends Activity {
    /** Called when the activity is first created. */
    
    private Button btn_utf8;
    private Button btn_ansi;
    private Button btn_unicode;
    private Button btn_bigunicode;
    private TextView tv;
    private String fpath;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        fpath = "/data/"+Environment.getDataDirectory().getAbsolutePath()+"/zziss.android.txt/";
        
        btn_utf8 = (Button)this.findViewById(R.id.btn_utf8);
        btn_ansi = (Button)this.findViewById(R.id.btn_ansi);
        btn_unicode = (Button)this.findViewById(R.id.btn_un);
        btn_bigunicode = (Button)this.findViewById(R.id.btn_bigunicode);
        tv = (TextView)this.findViewById(R.id.tv);
        btn_utf8.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String fname  = fpath + "utf8.txt";
                File file = new File(fname);
                try {
                    /*Reader reader = new FileReader(file);
                    char[] c = new char[100];
                    reader.read(c);*/
                    InputStream reader = new FileInputStream(file);
                    byte[] b = new byte[reader.available()];
                    reader.read(b);
                    // 这个也不可以转成 gbk
                    String s = new String(b,"utf-8");
                    tv.setText(s);
                    
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
        });  // btn_utf8
        
        btn_ansi.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String fname  = fpath + "ansi.txt";
                File file = new File(fname);
                try {
                    /*Reader reader = new FileReader(file);
                    char[] c = new char[100];
                    reader.read(c);
                    String s = String.valueOf(c);*/
                    InputStream reader = new FileInputStream(file);
                    byte[] b = new byte[100];
                    reader.read(b);
                    // ansi的我一直使用 iso8859-1 或 us-ascii ，但都是乱码，换成 gbk 就 ok 了
                    String s = new String(b,"GBK");
                    tv.setText(s);
                    
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
        });  // btn_utf8
        
        btn_unicode.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String fname  = fpath + "unicode.txt";
                File file = new File(fname);
                try {
                    /*Reader reader = new FileReader(file);
                    char[] c = new char[100];
                    reader.read(c);
                    String s = String.valueOf(c);*/
                    InputStream reader = new FileInputStream(file);
                    byte[] b = new byte[reader.available()];
                    reader.read(b);
                    // utf-16 的就不可以转成 gbk
                    String s = new String(b,"utf-16");
                    tv.setText(s);
                    
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
        });  // unicode
        
        btn_bigunicode.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String fname  = fpath + "bigunicode.txt";
                File file = new File(fname);
                try {
                    /*Reader reader = new FileReader(file);
                    char[] c = new char[100];
                    reader.read(c);
                    String s = String.valueOf(c);*/
                    InputStream reader = new FileInputStream(file);
                    byte[] b = new byte[reader.available()];
                    reader.read(b);
                    // 对于 bigunicode ，转成 gbk 就可以
                    String s = new String(b,"GBK");
                    tv.setText(s);
                    
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
        });  // btn_bigunicode
        
    }
}