android如何往SDCard中存取圖片

博客分類：Android

androidSDCard圖片存取 

引用

Java代碼  

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.graphics.Bitmap;
import android.os.Environment;
import android.util.Log;

/**
 * 保存圖片的類
 *
 *
 */
public class SaveBitmap {

    private final static String CACHE = "/css";

    /**
     * 保存圖片的方法 保存到sdcard
     *
     * @throws Exception
     *
     */
    public static void saveImage(Bitmap bitmap, String imageName)
            throws Exception {
        String filePath = isExistsFilePath();
        FileOutputStream fos = null;
        File file = new File(filePath, imageName);
        try {
            fos = new FileOutputStream(file);
            if (null != fos) {
                bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos);
                fos.flush();
                fos.close();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取sd卡的緩存路徑， 一般在卡中sdCard就是這個目錄
     *
     * @return SDPath
     */
    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();// 獲取根目錄
        } else {
            Log.e("ERROR", "沒有內存卡");
        }
        return sdDir.toString();
    }

    /**
     * 獲取緩存文件夾目錄 如果不存在創建 否則則創建文件夾
     *
     * @return filePath
     */
    private static String isExistsFilePath() {
        String filePath = getSDPath() + CACHE;
        File file = new File(filePath);
        if (!file.exists()) {
            file.mkdirs();
        }
        return filePath;
    }
    /**
     * 獲取SDCard文件
     *
     * @return Bitmap
     */
    public static Bitmap getImageFromSDCard(String imageName) {
        String filepath = getSDPath() + CACHE  + "/" + imageName;
        File file = new File(filepath);
        if (file.exists()) {
            Bitmap bm = BitmapFactory.decodeFile(filepath);
            return bm;
        }
        return null;
    }
}