android 讀取,寫入圖片到sd卡源碼

標籤：android讀寫   android圖片儲存   androidsd卡源碼   

<pre name="code" class="html"><!--<span style="font-family: Arial, Helvetica, sans-serif;">在AndroidMainfest.xml檔案中添加</span><span style="font-family: Arial, Helvetica, sans-serif;">--></span>

<!-- 在SDCard中建立與刪除檔案許可權 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" ></uses-permission> <!-- 往SDCard寫入資料許可權 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" ></uses-permission> <uses-permission android:name="android.permission.RESTART_PACKAGES" ></uses-permission>

<!--<span style="font-family: Arial, Helvetica, sans-serif;">注意：在<application...></application>前添加</span><span style="font-family: Arial, Helvetica, sans-serif;">--></span>

/**     * Save Bitmap to a file.儲存圖片到SD卡。     *      * @param bitmap     * @param file     * @return error message if the saving is failed. null if the saving is     *         successful.     * @throws IOException     */    public static void saveBitmapToFile(Bitmap bitmap, String _file)            throws IOException {//_file = <span style="font-family: Arial, Helvetica, sans-serif;">getSDPath()+"</span><span style="font-family: Arial, Helvetica, sans-serif;">/xx自訂檔案夾</span><span style="font-family: Arial, Helvetica, sans-serif;">/hot.png</span><span style="font-family: Arial, Helvetica, sans-serif;">"</span>        BufferedOutputStream os = null;        try {            File file = new File(_file);            // String _filePath_file.replace(File.separatorChar +            // file.getName(), "");            int end = _file.lastIndexOf(File.separator);            String _filePath = _file.substring(0, end);            File filePath = new File(_filePath);            if (!filePath.exists()) {                filePath.mkdirs();            }            file.createNewFile();            os = new BufferedOutputStream(new FileOutputStream(file));            bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);        } finally {            if (os != null) {                try {                    os.close();                } catch (IOException e) {                    Log.e(TAG_ERROR, e.getMessage(), e);                }            }        }    }

<pre name="code" class="java">//讀取public class MainAct extends Activity {        /** Called when the activity is first created. */        private ImageView img;        //SD圖片路徑        private String filepath = <span style="font-family: Arial, Helvetica, sans-serif;">getSDPath()+"</span><span style="font-family: Arial, Helvetica, sans-serif;">/xx自訂檔案夾</span><span style="font-family: Arial, Helvetica, sans-serif;">/hot.png</span><span style="font-family: Arial, Helvetica, sans-serif;">"</span>        @Override        public void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.main);                img = (ImageView) findViewById(R.id.img);                File file = new File(filepath);                if (file.exists()) {                        Bitmap bm = BitmapFactory.decodeFile(filepath);                        //將圖片顯示到ImageView中                        img.setImageBitmap(bm);                }        }}

/** * 擷取SDK路徑 * @return */public static String getSDPath(){        File sdDir = null;        boolean sdCardExist = Environment.getExternalStorageState()                              .equals(android.os.Environment.MEDIA_MOUNTED);   //判斷sd卡是否存在        if   (sdCardExist)          {                                        sdDir = Environment.getExternalStorageDirectory();//擷取跟目錄       }          return sdDir.toString();        }