Android 檔案操作大全

1. android的檔案操作要有許可權：
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   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
3. SD卡下的檔案操作：
4. 1、判斷SD卡是否插入
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   Environment.getExternalStorageState().equals(  
           android.os.Environment.MEDIA_MOUNTED); 
   Environment.getExternalStorageState().equals(
           android.os.Environment.MEDIA_MOUNTED);
6. 2、獲得sd卡根目錄：
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   File skRoot = Environment.getExternalStorageDirectory(); 
   File skRoot = Environment.getExternalStorageDirectory();
8. 私人目錄下的檔案操作：
9. 1、獲得私人根目錄：
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    File fileRoot = Context.getFilesDir()+"\"; 
     File fileRoot = Context.getFilesDir()+"\";
11. 還未整理
12. 檔案夾或檔案夾操作：
13. 1、確定或獲得檔案夾和檔案路徑
14. a、獲得檔案或檔案夾的絕對路徑和相對路徑。區別
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    String path = File.getPath();//相對  
    String path = File.getAbsoultePath();//絕對 
    String path = File.getPath();//相對
    String path = File.getAbsoultePath();//絕對
16. b 、獲得檔案或檔案夾的父目錄
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    String parentPath = File.getParent(); 
    String parentPath = File.getParent();
18. c、獲得檔案或檔案夾的名稱：
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    String Name = File.getName(); 
    String Name = File.getName();
20. 2、建立檔案或檔案夾
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    File.mkDir(); //建立檔案夾  
    File.createNewFile();//建立檔案 
    File.mkDir(); //建立檔案夾
    File.createNewFile();//建立檔案
     
22. 3、判斷是檔案或檔案夾
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    File.isDirectory() 
    File.isDirectory()
24. 4、列出檔案夾下的所有檔案和檔案夾名
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    File[] files = File.listFiles(); 
    File[] files = File.listFiles();
26. 5、修改檔案夾和檔案名稱
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    File.renameTo(dest); 
    File.renameTo(dest);
28. 6、刪除檔案夾或檔案
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    File.delete(); 
    File.delete();
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    package otheri.common;  
     
    import java.io.File;  
    import java.io.FileInputStream;  
    import java.io.FileOutputStream;  
    import java.io.IOException;  
    import java.io.InputStream;  
    import java.io.OutputStream;  
     
    import otheri.io.Input;  
    import otheri.io.Output;  
    import android.content.Context;  
    import android.os.Environment;  
     
    public class FileHelper {  
        private Context context;  
        private String SDPATH;  
        private String FILESPATH;  
     
        public FileHelper(Context context) {  
            this.context = context;  
            SDPATH = Environment.getExternalStorageDirectory().getPath() + "\";  
            FILESPATH = this.context.getFilesDir().getPath() + "\";  
        }  
     
         
        public File creatSDFile(String fileName) throws IOException {  
            File file = new File(SDPATH + fileName);  
            file.createNewFile();  
            return file;  
        }  
     
         
        public boolean delSDFile(String fileName) {  
            File file = new File(SDPATH + fileName);  
            if (file == null || !file.exists() || file.isDirectory())  
                return false;  
            file.delete();  
            return true;  
        }  
     
         
        public File creatSDDir(String dirName) {  
            File dir = new File(SDPATH + dirName);  
            dir.mkdir();  
            return dir;  
        }  
     
         
        public boolean delSDDir(String dirName) {  
            File dir = new File(SDPATH + dirName);