下载类，可以url下载到相册，记得在清单加权限，6.0代码动态加权限判断，下载图片要在子线程中下载，下载完后广播更新相册
在清单文件里面添加权限：
下载的url的工具类：
/**
* Created by YuShuangPing on 2018/12/12.
*/
public class DonwloadSaveImg {
private static Context context;
private static String filePath;
private static Bitmap mBitmap;
private static String mSaveMessage = "失败";
private final static String TAG = "PictureActivity";
private static ProgressDialog mSaveDialog = null;
public static void donwloadImg(Context contexts, String filePaths) {
context = contexts;
filePath = filePaths;
mSaveDialog = ProgressDialog.show(context, "保存图片", "图片正在保存中，请稍等...", true);
new Thread(saveFileRunnable).start();
}
private static Runnable saveFileRunnable = new Runnable() {
@Override
public void run() {
try {
if (!TextUtils.isEmpty(filePath)) { //网络图片
// 对资源链接
URL url = new URL(filePath);
//打开输入流
InputStream inputStream = url.openStream();
//对网上资源进行下载转换位图图片
mBitmap = BitmapFactory.decodeStream(inputStream);
inputStream.close();
}
saveFile(mBitmap);
mSaveMessage = "图片保存成功！";
} catch (IOException e) {
mSaveMessage = "图片保存失败！";
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
messageHandler.sendMessage(messageHandler.obtainMessage());
}
};
private static Handler messageHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
mSaveDialog.dismiss();
Log.d(TAG, mSaveMessage);
Toast.makeText(context, mSaveMessage, Toast.LENGTH_SHORT).show();
}
};
/**
* 保存图片
* @param bm
* @throws IOException
*/
public static void saveFile(Bitmap bm ) throws IOException {
File dirFile = new File(Environment.getExternalStorageDirectory().getPath());
if (!dirFile.exists()) {
dirFile.mkdir();
}
String fileName = UUID.randomUUID().toString() + ".jpg";
File myCaptureFile = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/" + fileName);
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
bos.flush();
bos.close();
//把图片保存后声明这个广播事件通知系统相册有新图片到来
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri uri = Uri.fromFile(myCaptureFile);
intent.setData(uri);
context.sendBroadcast(intent);
}
}
在Activity中进行调用：
public class DownloadSavePictureActivity extends AppCompatActivity {
private Button btn_pic;
private Bitmap bitmap;
private String Path="http://39.106.39.112:33/public/static/img/qrcode/MAB214ef69e7a5102f86ca8b0136224117.png";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_download_save_picture);
btn_pic=findViewById(R.id.btn_pic);
btn_pic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ImgDonwloads.donwloadImg(DownloadSavePictureActivity.this,Path);//iPath
}
});
}
}
注意：对于Android6.0以上的手机一定要判断相应的权限是否开启