文件操作

 1.assets裏的東西拷貝到sd卡里或拷貝到/data/data/包名

// assets裏的東西拷貝到sd卡里、拷貝到/data/data/包名 不可用 .zip格式的可用
    //                                              解決：把.zip拷貝到/data/data/包名 在解壓
    //dir沒用到、assetDir拷貝到此目錄
    private void CopyAssets(String assetDir, String dir) {
        String[] files;
        try {
            files = this.getResources().getAssets().list("");//得到assets下所有目錄
        } catch (IOException e1) {
            return;
        }

        File mWorkingPath = new File(assetDir);//assets東西拷貝到mWorkingPath裏

        /*不存在路徑創建、創建*/
        if (!mWorkingPath.exists()) {
            if (!mWorkingPath.mkdirs()) {
            }
        }

        for (int i = 0; i < files.length; i++) {
            try {
                String fileName = files[i];

                /*目錄裏嵌套目錄情況、*/
                // if (!fileName.contains(".")) {
                // if (0 == assetDir.length()) {
                // CopyAssets(fileName, dir + fileName + "/");
                // } else {
                // CopyAssets(assetDir + "/" + fileName, dir + fileName
                // + "/");
                // }
                // continue;
                // }

                File outFile = new File(mWorkingPath, fileName);
                if (outFile.exists()) {// mWorkingPath裏已經存在fileName文件
                    break;
                    // outFile.delete();//刪除以前的
                }

                /*fileName assets裏的文件名、outFile輸出的目錄+文件名(fileName)*/
                InputStream in = null;
                if (0 != assetDir.length()) {
                    // in = getAssets().open(assetDir + "/" + fileName);
                    in = getAssets().open(fileName);
                } else {
                    in = getAssets().open(fileName);
                }

                OutputStream out = new FileOutputStream(outFile);
                byte[] buf = new byte[1024];
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }

                in.close();
                out.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

 

2.獲得assets下的所有文件名

private Context mContext = (Context) MediaActivity.sMediaActivity; //

/* 獲得assets下的資源列表 */
        String[] files;
        files = this.mContext.getResources().getAssets().list("");
        for (int i = 0; i < files.length; i++) {
            System.out.println(" length length  " + files[i]);
            File fileM = new File(files[i]); //檢查不到Assets的文件是否存在
            if (!fileM.exists())
                System.out.println(" not exits  ");
        }

 

3.分別到sdcard 和assets裏查找文件沒有此文件拋出異常 

public static String getSDPath(String fileName) {

        System.out.println(" data/adc.pngadc.png adc.png  not exits  "
                + fileName);
        File file = Environment.getExternalStorageDirectory();
        String sdPath = file.getAbsolutePath();
        String picPath = sdPath + "/all/" + fileName;

        File fileM = new File(picPath);
        if (!fileM.exists()) {
            System.out.println(" data/adc.pngadc.png2 adc.png  not exits  ");
            AssetManager am = PathStatic.mContext.getAssets();
            try {
                am.open(fileName);
                System.out
                        .println(" data/adc.pngadc.png 1adc.png  not exits  ");
                return fileName;
            } catch (IOException e) { // assets文件不存在
                System.out
                        .println(" data/adc.pngadc.png0 adc.png  not exits  ");
                // MediaStatic.noMovieFile();
                e.printStackTrace();
                return "";
            }
        }

        return picPath;
    }