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[英]How to download a media file from FirebaseStorage to local storage using MediaStore?
[英]How to stream and download a media from local storage using Android's VideoView?
我必須從服務器流式傳輸和下載視頻文件,並在VideoView中顯示它,感謝谷歌,VV自然不支持我的要求,所以這就是我所做的:
1-使用NanoHTTPD創建HTTP代理並開始從服務器下載文件
2啟動VideoView並將uri設置為我的HTTP代理
我的代理服務器內部有3個內部服務器(),我開始對VideoView進行響應,就像使用具有適當響應頭的真實服務器一樣(我的意思是content-length / content-range帶有206響應)
但是問題開始於VideoView,它可以正常讀取300kb的視頻文件,然后再從619kb或其他內容進行請求。 我沒有任何線索,為什么VV要從300,000bytes跳到突然跳到619,000bytes,經過10次嘗試,它會在VideoView的c ++代碼內以錯誤-1004響應我,我找不到任何線索是什么那。
以下是我的完整解決方案。 感謝任何幫助,因為我對VideoView一無所知,這是一種奇怪的行為!!!
注意:我故意修復了文件的大小,沒有任何問題。
package com.example.videoBuffer2;
import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.VideoView;
import java.io.*;
import java.util.Map;
public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
Button btn;
VideoView videoView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.button);
videoView = (VideoView) findViewById(R.id.videoView);
MediaController mediaController = new
MediaController(this);
videoView.setMediaController(mediaController);
final VideoStreamServer server = new VideoStreamServer(9090);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
server.start();
} catch (IOException e) {
e.printStackTrace();
}
videoView.setVideoURI(Uri.parse("http://127.0.0.1:9090/1.mp4"));
videoView.requestFocus();
videoView.start();
}
});
}
public class VideoStreamServer extends NanoHTTPD
{
public VideoStreamServer(int port) {
super(port);
}
@Override
public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> parms, Map<String, String> files) {
//range=bytes=619814-
long range;
if (headers.containsKey("range"))
{
String contentRange = headers.get("range");
range = Integer.parseInt(contentRange.substring(contentRange.indexOf("=") + 1, contentRange.indexOf("-")));
}
else
range = 0;
byte[] buffer;
int constantLength = 256000;
long bufLength=0;
boolean isLastPart=false;
try {
RandomAccessFile ff =new RandomAccessFile(new File("/mnt/sdcard","1.mp4"),"rw" );
long remainingChunk = ff.length() - range; //remaining
if (remainingChunk < constantLength){
bufLength= remainingChunk; //means last part
isLastPart = true;
}
else
bufLength = constantLength;
if (range !=0)
ff.seek(range);
buffer= new byte[(int)bufLength];
ff.read(buffer);
} catch (FileNotFoundException e) {
e.printStackTrace();
buffer = new byte[0];
} catch (IOException e) {
e.printStackTrace();
buffer = new byte[0];
}
Response response;
// if (isLastPart)
// response = new Response(Response.Status.OK,"video/mp4",new ByteArrayInputStream(buffer));
// else
response = new Response(Response.Status.PARTIAL_CONTENT,"video/mp4",new ByteArrayInputStream(buffer));
response.addHeader("Content-Length","891064");
response.addHeader("Content-Range",String.format("bytes %s-%s/%s", range,(range+bufLength),"891064"));
Log.e("SERVER","Inside server sent " + String.format("bytes %s-%s/%s", range,(range+bufLength),"891064"));
return response;
}
}
}
最終,我發現了問題所在,並不是代碼,但根據Google的文檔,我使用的媒體不是標准的。
您可以在此處了解更多信息: http : //www.vahidhashemi.com/?p=120
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