今天给大家讲一下如何实现图片上传功能,以上所讲呢全是经验之谈,把工作中的代码以功能的形式展示出来,即为了大家学习借鉴,也为了日后工作的方便,加深理解。
图片上传,众所周知,无非是是拍照和相册选取两种,可以用dialog,activity,popwindow等展示界面,具体大家自己去实现,本文只讲功能
调取拍照功能:
private void camera() {try {tempImg1 = new File(MainActivity.this.getExternalCacheDir(), System.currentTimeMillis() + ".jpg");if (!tempImg1.exists()) {boolean b = tempImg1.createNewFile();if (b) {log.i(tempImg1.getAbsolutePath());Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempImg1));startActivityForResult(intent, 1);}}} catch (IOException e) {log.e(e);}}
调取相册功能:
private void photos() {Intent getImage = new Intent(Intent.ACTION_PICK, null);getImage.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");//这是图片类型startActivityForResult(getImage, 2);}
然后是如何在 public void onActivityResult(int requestCode, int resultCode, Intent data)里进行处理呢?
requestCode请求码,resultCode结果码,data是传递的数据
@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {if (resultCode == Activity.RESULT_OK) {switch (requestCode) {case 1:if (tempImg1 != null) {//调用裁剪功能或者压缩//scaleImage(Uri.fromFile(tempImg1));}break;case 2:if (data != null) {//调用裁剪功能或者压缩// scaleImage(data.getData());}break;default:break;}}}
裁剪有系统的裁剪方式,也有自定义的裁剪方式
系统裁剪:
/*** 裁剪图片*/public void startPhotoZoom(Uri uri, int size) {Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");intent.putExtra("crop", "true");// crop=true 有这句才能出来最后的裁剪页面.intent.putExtra("aspectX", 1);// 这两项为裁剪框的比例.intent.putExtra("aspectY", 1);// x:y=1:1intent.putExtra("outputX", size);//图片输出大小intent.putExtra("outputY", size);intent.putExtra("output", Uri.fromFile(tempImg));intent.putExtra("outputFormat", "jpg");// 返回格式startActivityForResult(intent, 3);}
自定裁剪很多,这里也为大家推荐github上比较流行的几款裁剪库
/wangchang163/uCrop
/wangchang163/cropper
/wangchang163/android-crop
以上都是很经典的老牌crop库,大家可以作为参考!
裁剪过后自然是保存图片,进行上传啦,上传具体参考后台接口,不做介绍了,当然还有一种情况,就是不需要裁剪,只进行压缩,因为裁剪是选取局部图片,当图片太大,又不需要裁剪时,就需要进行压缩了,这里提供一个压缩方法
private void scaleImage(Uri uri) {Bitmap bitmap = null;try {bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);int width = bitmap.getWidth();int height = bitmap.getHeight();if (width > 800 || height > 800) {if (width > height) {float scaleRate = (float) (800.0 / width);width = 800;height = (int) (height * scaleRate);Bitmap map = Bitmap.createScaledBitmap(bitmap, width, height, true);saveBitmap(map);} else {float scaleRate = (float) (800.0 / height);height = 800;width = (int) (width * scaleRate);Bitmap map = Bitmap.createScaledBitmap(bitmap, width, height, true);saveBitmap(map);}} else {saveBitmap(bitmap);}} catch (IOException e) {e.printStackTrace();}}private void saveBitmap(Bitmap map) {File file = new File(getExternalCacheDir(), System.currentTimeMillis() + ".jpg");try {BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));press(pressFormat.JPEG, 80, bos);bos.flush();bos.close();updateImg(file);//上传图片接口} catch (Exception e) {e.printStackTrace();}}
嗯,就这样吧,基本上可以实现此功能,仅供参考借鉴,如有帮助,请点赞,谢谢!