Android实现图片下载并保存SD卡

一、首先获取图片 

//第一种获取图片的方法

String filePath = downloadUrl;
//以下是取得图片的方法
取得的是InputStream，直接从InputStream生成bitmap 
mBitmap = BitmapFactory.decodeStream(getImageStream(filePath))；

public InputStream getImageStream(String path) throws Exception{
    URL url = new URL(path);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setConnectTimeout(5 * 1000);
    conn.setRequestMethod("GET");
    if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
        return conn.getInputStream();
    }
    return null;
}

//第二种获取图片的方法

String filePath = downloadUrl;
//以下是取得图片的方法
取得的是byte数组, 从byte数组生成bitmap
byte[] data = getImage(filePath);
if(data!=null){
    mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
}else{
    Toast.makeText(MainActivity.this, "Image error!", Toast.LENGTH_SHORT).show();
}
public byte[] getImage(String path) throws Exception{
    URL url = new URL(path);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setConnectTimeout(5 * 1000);
    conn.setRequestMethod("GET");
    InputStream inStream = conn.getInputStream();
    if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
        return readStream(inStream);
    }
    return null;
}
public static byte[] readStream(InputStream inStream) throws Exception{
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int len = 0;
    while( (len=inStream.read(buffer)) != -1){
        outStream.write(buffer, 0, len);
    }
    outStream.close();
    inStream.close();
    return outStream.toByteArray();
}

二、保存图片

**
 * 保存bitmap到SD卡
 * @param bitmap
 */
public void saveBitmapToSDCard(Bitmap bitmap) {
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(picPath);//picPath为保存SD卡路径
        if (fos != null) {
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.close();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

源码下载地址:https://download.csdn.net/download/daxudada/10272805

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