Android图片上传蒙层进度条
青人 人气:0需求
上传图片时在图片上增加蒙层,蒙层随着上传的大小由下自上逐渐缩短。
分析
1、用xml文件画一个正方形的shape
2、利用ClipdDrawable来实现图片的动态剪切
3、使用AsynTask来控制图片的上传,然后动态的改变ClipDrawable.setLevel()方法中的值,这样基本就能达到图片上传蒙层的效果。
其中,本文中,在将图片数据流写向网络时,上传进度的值是根据正向的输出流的速度来判断的。也就是说不是服务器接收图片的速度,即使进度条表示图片已完全上传,也只是表示将图片上传到网络的大小。
实现
1、定义正方形的shape,drawable\mask.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <!--大小--> <size android:height="82dp" android:width="82dp"/> <!--<solid android:color="#3f000000" />--> <solid android:color="#ffff4444"/> </shape>
2、定义ClipDrawable由下自上的方式剪切,drawable\clip.xml
<?xml version="1.0" encoding="utf-8"?> <clip xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/bg_feedback_mask" android:clipOrientation="vertical" android:gravity="top"/>
3、在主界面中定义ImageView,将clip.xml引入
<ImageView android:id="@+id/thumbnail" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitXY" /> <ImageView android:id="@+id/picture_upload_progress" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/bg_feedback_clip" android:visibility="gone" />
第一个是放缩略图的,第一个是放进度条的,我们可以将它们放在FrameLayout中表示上下层的关系。
4、AsynTask处理上传图片
private class UploadPictureTask extends AsyncTask<String, Integer, UploadPictureResult> { private String filePath; private CountingTypedFile.ProgressListener listener; public UploadPictureTask(String filePath) { this.filePath = filePath; } @Override protected void onPreExecute() { uploadProgressImageView.setVisibility(View.VISIBLE); uploadProgressImageView.getDrawable().setLevel(MAX_LEVEL); super.onPreExecute(); } @Override protected UploadPictureResult doInBackground(String... params) { File file = new File(filePath); fileSize = file.length(); listener = new CountingTypedFile.ProgressListener() { @Override public void transferred(long num) { publishProgress((int) ((num / (float) fileSize) * NUM_100)); } }; UploadPictureResult uploadPictureResult = uploadImage(id, new CountingTypedFile("multipart/form-data", file, listener) return uploadPictureResult; } @Override protected void onProgressUpdate(Integer... values) { //蒙层进度条 (uploadProgressImageView.getDrawable()).setLevel(MAX_LEVEL - values[0] * NUM_100); } @Override protected void onPostExecute(UploadPictureResult uploadImageResult) { findViewById(R.id.send_feedback).setVisibility(View.VISIBLE); if (exception != null || uploadImageResult == null) { Toast.makeText(FeedbackActivity.this, "上传失败", Toast.LENGTH_SHORT).show(); return; } Toast.makeText(FeedbackActivity.this, "上传成功", Toast.LENGTH_SHORT).show(); pictureUrl = uploadImageResult.getUrl(); super.onPostExecute(uploadImageResult); } }
上传进度条的监听需要自己写一个。
public class CountingTypedFile extends TypedFile { private static final int BUFFER_SIZE = 4096; private final ProgressListener listener; /** * Constructs a new typed file. * * @param mimeType * @param file * @throws NullPointerException if file or mimeType is null */ public CountingTypedFile(String mimeType, File file, ProgressListener listener) { super(mimeType, file); this.listener = listener; } @Override public void writeTo(OutputStream out) throws IOException { byte[] buffer = new byte[BUFFER_SIZE]; FileInputStream in = new FileInputStream(super.file()); long total = 0; try { int length; while ((length = in.read(buffer)) != -1) { total += length; this.listener.transferred(total); out.write(buffer, 0, length); } } finally { in.close(); } } public interface ProgressListener { void transferred(long num); } }
好了,以上步骤就差不多完成了。
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