我已经制作了一个应用程序，它将从youtube视频下载数据并处理它以获取视频图像和标题和视频质量，但它花费了太多时间，应用程序是Buggy有我的代码：
package amaigh.halzoun;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainActivity extends Activity {
int contentlenght;
public class DownloadTask extends AsyncTask<String, Void , String> {
@Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection)url.openConnection();
contentlenght = urlConnection.getResponseCode();
if (contentlenght == 200) {
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
}
else
return "Connection Lost";
}
catch(Exception e) {
e.printStackTrace();
return "Failed";
}
}
}
public class ImageDownload extends AsyncTask<String,Void,Bitmap>{
@Override
protected Bitmap doInBackground(String... urls) {
try{
URL url = new URL(urls[0]);
Log.i("DOWNLOAD IMAGE URL:" ,url.toString());
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
urlConnection.connect();
InputStream in = urlConnection.getInputStream();
Bitmap image = BitmapFactory.decodeStream(in);
return image;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void Start (View view)
{
String Url = "";
ImageView VideoImage = (ImageView)findViewById(R.id.imageView2);
EditText URLInput = (EditText)findViewById(R.id.URL);
Url = URLInput.getText().toString();
Log.i("Original URL: ", Url);
Url = Url.replace("watch?v=","embed/");
Log.i("Title URL: ", Url);
DownloadTask GetTitle = new DownloadTask();
String result = "";
String VideoUrl = Url.replace("https://www.youtube.com/embed/","https://i.ytimg.com/vi/");
VideoUrl += "/hqdefault.jpg";
ImageDownload imageDownloader = new ImageDownload();
Bitmap image = null;
try {
result = GetTitle.execute(Url).get();
image = imageDownloader.execute(VideoUrl).get();
VideoImage.setImageBitmap(image);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
GetTitle(result);
Url = URLInput.getText().toString();
DownloadTask GetVideoInfo = new DownloadTask();
result = "";
try {
result = GetVideoInfo.execute(Url).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Log.i("Resultat: ", result);
}
public void GetTitle(String Content){
String searchString = "<title>(.*?)</title>";
Pattern p = Pattern.compile(searchString);
TextView VideoTitle = (TextView)findViewById(R.id.VideoTitle);
Matcher m = p.matcher(Content);
while (m.find()){
Log.i("Title: ", m.group(1));
VideoTitle.setText(m.group(1));
}
}
public void GetInfo(String Content){
ArrayList<String> VideoQuality = new ArrayList<>();
String searchString = "quality_label=(.*?)p";
Pattern p = Pattern.compile(searchString);
Matcher m = p.matcher(Content);
while (m.find()){
VideoQuality.add(m.group(0).replace("quality_label=",""));
}
int a = 0;
VideoQuality.remove(0);
VideoQuality.remove(2);
VideoQuality.remove(4);
VideoQuality.remove(6);
VideoQuality.remove(8);
VideoQuality.remove(10);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,VideoQuality);
Spinner Spinner = (Spinner)findViewById(R.id.spinner);
Spinner.setAdapter(adapter);
}
}
请告诉我我做错了什么
答案 0 :(得分：0)
您可以使用Spring的Restful Web Services，它可以通过减少处理时间和提高效率来帮助您。 你可以通过对象或其他方法从webUrl下载数据， 它还减少了解析数据的麻烦，也减少了代码的大小。