I want to read a remote text file and show its content in a textview. I have written this below code, but it doesn't get any information from the text file.
How can I find the reason of this problem or solve it?
isn't there anything wrong in my code?
private void readFile()
{
try {
String path ="http://host.com/info.txt";
URL u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
InputStream in = c.getInputStream();
Log.e("value",in.toString());
AssetManager mngr=getAssets();
ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
TextView text = (TextView) findViewById(R.id.TextView1);
text.setText(bo.toString());
bo.close();
}
catch (NetworkOnMainThreadException e) {
}
catch (MalformedURLException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Did you added internet permission to your Manifest file?
Are you launching your code in separate thread (please don't catch NetworkOnMainThreadException)
Check LogCat what exception do you have?
Removed c.setDoOutput(true); this is used to send data to server.
Here how it should be:
new Thread() {
#Override
public void run() {
String path ="http://host.com/info.txt";
URL u = null;
try {
u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView text = (TextView) findViewById(R.id.TextView1);
text.setText(bo.toString());
try {
bo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
Related
I use httpUrlConnection to get information from the server. When I run it on Android, if the device is connected to Wi-Fi, there is no problem, but when I use mobile data, No information is received from the server.
My Codes:
new Thread(){
#Override public void run(){
try {
URL u = new URL("https://api.jsonbin.io/v3/b/63a744c0dfc68e59d570253e");
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
final byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView t = findViewById(R.id.tv);
t.setText("bo.toString");
try
{
bo.close();
}catch(IOException e){
e.printStackTrace();
} }
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} }
}.start();
I tried different Internet operators and I reinstalled application But again the information was not received.
url = "http://r8---sn-03guxaxjvh-3c2r.googlevideo.com/videoplayback?sparams=dur%2Cei%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Csource%2Cexpire&mn=sn-03guxaxjvh-3c2r&ip=212.113.45.145&source=youtube&mm=31&mv=m&mime=video%2Fmp4&mt=1505092537&ipbits=0&initcwndbps=685000&dur=2223.728&id=o-AM9pUI9o5NsL8P-jGi5-w17xJOo-VVQ-TrWlMZaV17cp&key=yt6&lmt=1499875418101464&signature=4AACC08B22F2F1F343F5A044188CD751A6AD2F08.A7BA661DDC07639A7E414169226A35A700888AF3&ms=au&ei=HOS1WezYFZfq7gT40rnoAw&itag=22&pl=22&expire=1505114236&ratebypass=yes&title=Gothic+Rock+-+Dark+Music";
streamPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
streamPlayer.setDataSource(url);
} catch (IOException e) {
e.printStackTrace();
}
try {
streamPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
streamPlayer.start();`
my question is how to store on a device my streamPlayer object?
Try this
private static void downloadFile(String url, File outputFile) {
try {
URL u = new URL(url);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new
FileOutputStream(outputFile));
fos.write(buffer);
fos.flush();
fos.close();
} catch(FileNotFoundException e) {
return; // swallow a 404
} catch (IOException e) {
return; // swallow a 404
}
}
I want to make a TextView or Imageview that request info from the internet, as if it was a newspapper that's updated daily, I want to do something similar but I don't know how.
I guess I should have a server or something but could someone explain me the process? and which server or what to do?
first you need to enable the permission in the android manifest
<uses-permission android:name="android.permission.INTERNET" />
than you can use a textView like this
new Thread() {
#Override
public void run() {
String path ="http://host.com/info.txt"; // your webpage with text
URL u = null;
try {
u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView text = (TextView) findViewById(R.id.TextView1);
text.setText(bo.toString());
try {
bo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
following is my code:
private byte[] downloadImage(String image_url) {
byte[] image_blob = null;
URL _image_url = null;
HttpURLConnection conn = null;
InputStream inputStream = null;
try {
_image_url = new URL(image_url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
conn = (HttpURLConnection) _image_url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
conn.setDoInput(true);
try {
conn.connect();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
conn.setUseCaches(false);
try {
inputStream = conn.getInputStream();
inputStream.read(image_blob);
} catch (IOException ex) {
ex.printStackTrace();
} finally {
try {
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
conn.disconnect();
}
return image_blob;
}
What I am trying to do is to get the byte array of an Image. Use it in a parcel to transfer it to another activity.
Using this code a NullPointerException is reported. Can any one say what is wrong?
You might want to try it like this:
DefaultHttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(imageUrl);
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
int imageLength = (int)(entity.getContentLength());
InputStream is = entity.getContent();
byte[] imageBlob = new byte[imageLength];
int bytesRead = 0;
while (bytesRead < imageLength) {
int n = is.read(imageBlob, bytesRead, imageLength - bytesRead);
if (n <= 0)
; // do some error handling
bytesRead += n;
}
And by the way: The NullPointerException is caused because image_blob is null. You need to allocate the array first before you can read data into it.
Rather then sending image, you can send path of image which is download in cache. You can just use this methods to proive image path and download image into local path.
private String createLocal(String surl) {
URL url;
try {
url = new URL(surl);
String tempname=String.valueOf(surl.hashCode());
File root=getCacheDir();
File localfile=new File(root.getAbsolutePath()+"/"+tempname);
localfile.deleteOnExit();
if(!localfile.exists()){
InputStream is=url.openStream();
OutputStream os = new FileOutputStream(localfile);
CopyStream(is, os);
os.close();
}
return localfile.getAbsolutePath();
} catch (Exception e){
return null;
}
}
public static void CopyStream(InputStream is, OutputStream os) {
final int buffer_size=1024;
try {
byte[] bytes = new byte[buffer_size];
for(;;) {
int count=is.read(bytes, 0, buffer_size);
if(count == -1)
break;
os.write(bytes, 0, count);
}
}
catch(Exception ex){}
}
Your byte[] image_blob is null,you must new enough space like that before you use it:
image_blob = new byte[enough];
inputStream.read(image_blob);
public static byte[] getByteArray(String url) throws IOException {
InputStream inputStream = (InputStream) new URL(url).getContent();
return IOUtils.toByteArray(inputStream);
}
I am trying to fetchg data from server like MP3 files, video files, etc. in my application. The application should show the list of video files received from the server.
How can I do this?
/** this function will download content from the internet */
static int writeData(String fileurl, boolean append, String path,
String filename, Activity mContext) throws CustomException {
URL myfileurl = null;
ByteArrayBuffer baf = null;
HttpURLConnection conn = null;
String mimeType="";
final int length;
try {
myfileurl = new URL(fileurl);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
conn = (HttpURLConnection) myfileurl
.openConnection();
conn.setDoInput(true);
conn.connect();
conn.setConnectTimeout(100000);
length = conn.getContentLength();
mimeType=conn.getContentType().toString();
System.out.println("Extension..."+mimeType);
if(mimeType.equalsIgnoreCase("application/vnd.adobe.adept+xml") || mimeType.equalsIgnoreCase("text/html; charset=utf-8"))
return 0;
if (length > 0) {
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
baf = new ByteArrayBuffer(1000);
int current = 0;
while ((current = bis.read()) != -1) {
try {
baf.append((byte) current);
mBufferError=false;
} catch (Exception e){
// TODO: handle exception
mBufferError=true;
e.printStackTrace();
throw new CustomException("### memory problem ", "Buffer Error");
}
}
}
} catch (IOException e) {
mBufferError=true;
e.printStackTrace();
}
try{
if(conn.getResponseCode()==200 && mBufferError==false)
{
path = path + "/" + filename;
boolean appendData = append;
FileOutputStream foutstream;
File file = new File(path);
boolean exist = false;
try {
if (appendData)
exist = file.exists();
else
exist = file.createNewFile();
} catch (IOException e) {
try {
return 1;
} catch (Exception err) {
Log.e("SAX", err.toString());
}
}
if (!appendData && !exist) {
} else if (appendData && !exist) {
} else {
try {
foutstream = new FileOutputStream(file, appendData);
foutstream.write(baf.toByteArray());
foutstream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}catch (Exception e) {
// TODO: handle exception
throw new CustomException("### I/O problem ", "I/O Error");
}
return 1;
}
once download complete search the file with extension(.3gp) for video
hope it helps
Check this link,
https://stackoverflow.com/search?q=how+to+download+mp3+%2Cvideos+from+server+in+android
Try this code
url = "your url name+filename.jpg,mp3,etc..."
FileName = "/sdcard/savefilename" // save in your sdcard
try{
java.io.BufferedInputStream in = new java.io.BufferedInputStream(new java.net.URL(url).openStream());
java.io.FileOutputStream fos = new java.io.FileOutputStream(FileName);
java.io.BufferedOutputStream bout = new BufferedOutputStream(fos,1024);
byte[] data = new byte[1024];
int x=0;
while((x=in.read(data,0,1024))>=0){
bout.write(data,0,x);
}
fos.flush();
bout.flush();
fos.close();
bout.close();
in.close();
}
catch (Exception ex)
{
}
and after you want to use MediaPlayer
and create object of mediaplayer in your activity
and play.
mp.reset();
mp.start();