Develop Reference

To save file in a directory of Internal Storage

Here's a code of MainActivity.java to save a file named filename.txt in App's Internal Storage, which is working fine.
package com.bla.smthing;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class MainActivity extends Activity {
EditText textmsg;
static final int READ_BLOCK_SIZE = 100;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textmsg=(EditText)findViewById(R.id.editText1);
}
// write text to file
public void WriteBtn(View v) {
// add-write text into file
try {
FileOutputStream fileout=openFileOutput("mytextfile.txt", MODE_PRIVATE);
OutputStreamWriter outputWriter=new OutputStreamWriter(fileout);
outputWriter.write(textmsg.getText().toString());
outputWriter.close();
//display file saved message
Toast.makeText(getBaseContext(), "File saved successfully!",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
}
}
// Read text from file
public void ReadBtn(View v) {
//reading text from file
try {
FileInputStream fileIn=openFileInput("mytextfile.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);
char[] inputBuffer= new char[READ_BLOCK_SIZE];
String s="";
int charRead;
while ((charRead=InputRead.read(inputBuffer))>0) {
// char to string conversion
String readstring=String.copyValueOf(inputBuffer,0,charRead);
s +=readstring;
}
InputRead.close();
textmsg.setText(s);
} catch (Exception e) {
e.printStackTrace();
}
}
}
I am able to see the file by File Explorer of Android Studio. How can I save the file in a directory say files/Somefolder/otherfolderchild/filename.txt?
Currently, it is saving as files/filename.txt
Do I need to create additional parent file directories for that?

Try this it might help you. For the above marshmallow version please check the write permissions.
public void saveToExternalStorage() {
String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/directoryName";
try
{
File dir = new File(fullPath);
if (!dir.exists()) {
dir.mkdirs();
}
OutputStream fOut = null;
File file = new File(fullPath, "fileName.txt");
if(file.exists())
file.delete();
file.createNewFile();
fOut = new FileOutputStream(file);
fOut.flush();
fOut.close();
}
catch (Exception e)
{
Log.e("saveToExternalStorage()", e.getMessage());
}
}

image is not saving to android device in Sd card

package com.lociiapp;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import android.widget.Toast;
import com.androidquery.AQuery;
import com.example.imageslideshow.R;
public class recciverfullimageActivty extends Activity {
String reccvierid;
Context context;
ImageView recciverimage;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Intent myintent = getIntent();
reccvierid = myintent.getStringExtra("reccvierid");
recciverimage = (ImageView) findViewById(R.id.recciverImage);
String myfinalpathare = reccvierid;
Toast.makeText(getApplicationContext(), reccvierid, 10000).show();
String imagepathe = "http://api.lociiapp.com/TransientStorage/"
+ myfinalpathare + ".jpg";
try {
saveImage(imagepathe);
Log.e("****************************", "Sucess");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void saveImage(String urlPath) throws Exception {
String fileName = "test.jpg";
File folder = new File("/sdcard/LociiImages/");
// have the object build the directory structure, if needed.
folder.mkdirs();
final File output = new File(folder, fileName);
if (output.exists()) {
output.delete();
}
InputStream stream = null;
FileOutputStream fos = null;
try {
URL url = new URL(urlPath);
stream = url.openConnection().getInputStream();
// InputStreamReader reader = new InputStreamReader(stream);
DataInputStream dis = new DataInputStream(url.openConnection()
.getInputStream());
byte[] fileData = new byte[url.openConnection().getContentLength()];
for (int x = 0; x < fileData.length; x++) { // fill byte array with
// bytes from the data
// input stream
fileData[x] = dis.readByte();
}
dis.close();
fos = new FileOutputStream(output.getPath());
fos.write(fileData);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
This is My code I am trying to save Image which is coming from server we have Image Url . when i Run this Code then Folder is creating in Sd card But image is not downloading on Save in Sd care please help and tell where i am doing wrong .

Your checklist should be as follows:
A. Make sure you have the right permissions:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
B. Move networking and file IO logic to non-UI thread:
new AsyncTask<Params, Progress, Result>() {
#Override protected Result doInBackground() {
saveImage(imagepathe);
}
#Override protected void onPostExecute(String result) {
// update UI here
}
}.execute(params);
C. Do not read one byte at the time. It is probably not the source of your problem but it
does make your solution much slower than it can be:
Instead of:
for(;;) {
fileData[x] = dis.readByte();
}
Do this:
URL u = new URL(url);
URLConnection connection = u.openConnection();
byte[] buffer = new byte[connection.getContentLength()];
stream.readFully(buffer); // <------------- read all at once
stream.close();
D. And , finally, consider using Picasso for the job:
Picasso.with(context)
.load(url)
.resize(50, 50)
.centerCrop()
.into(imageView)
Nowadays you just no not need to write that much code to get were you're going..

Try this..
Call like below instead of saveImage(imagepathe);
myAsyncTask myWebFetch = new myAsyncTask();
myWebFetch.execute();
and myAsyncTask.class
class myAsyncTask extends AsyncTask<Void, Void, Void> {
public ProgressDialog dialog;
myAsyncTask()
{
dialog = new ProgressDialog(webview.this);
dialog.setMessage("Loading image...");
dialog.setCancelable(true);
dialog.setIndeterminate(true);
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
dialog.dismiss();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
dialog.show();
}
protected Void doInBackground(Void... arg0) {
try {
InputStream stream = null;
URL url = new URL("http://api.lociiapp.com/TransientStorage/286.jpg");
URLConnection connection = url.openConnection();
try {
HttpURLConnection httpConnection = (HttpURLConnection) connection;
httpConnection.setRequestMethod("GET");
httpConnection.connect();
File SDCardRoot = Environment.getExternalStorageDirectory();
File myDir = new File(SDCardRoot + "/LociiImages");
myDir.mkdirs();
File file = new File(myDir,"test.jpg");
FileOutputStream fileOutput = new FileOutputStream(file);
if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
stream = httpConnection.getInputStream();
}
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ( (bufferLength = stream.read(buffer)) > 0 ) {
fileOutput.write(buffer, 0, bufferLength);
}
fileOutput.close();
} catch (Exception ex) {
ex.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
EDIT
String imagePath = Environment.getExternalStorageDirectory().toString() + "/LociiImages/test.jpg";
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
imageview.setImageBitmap(bitmap);

async task fails when i try to use params

guys. I have this code:
package com.example.httpprogress;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
public class MyPicGetTask extends AsyncTask<URL , Void, Bitmap>{
InputStream is = null;
BufferedInputStream bis = null;
Bitmap bmp = null;
#Override
protected Bitmap doInBackground(URL... urls) {
// TODO Auto-generated method stub
URL url = urls[0];
try {
URLConnection conn = url .openConnection();
conn.connect();
is = conn.getInputStream();
bis = new BufferedInputStream( is );
bmp = BitmapFactory.decodeStream( bis );
} catch (MalformedURLException e) {
} catch (IOException e) {
} finally {
try {
is.close();
bis.close();
} catch (IOException e) {
}
}
return bmp;
}
}
it fails, but if i use AsyncTask and describe this class as inner in my activity - it's ok . I can not say the reason because i can not debug, i can see that debug tab opens when it fails but it is not informative for me. Any ideas? Sorry for my noob question
that's my Activity:
package com.example.httpprogress;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
public class PicActivity extends Activity implements OnClickListener{
InputStream is = null;
BufferedInputStream bis = null;
Bitmap bmp = null;
private URL url;
//"http://192.168.0.30/03.jpg";
/*
private class getPicTask extends AsyncTask<Void, Void, Void>{
#Override
protected Void doInBackground(Void... s) {
// TODO Auto-generated method stub
try {
url = new URL("http://192.168.0.93/image.php");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
URLConnection conn = url .openConnection();
conn.connect();
is = conn.getInputStream();
bis = new BufferedInputStream( is );
bmp = BitmapFactory.decodeStream( bis );
} catch (MalformedURLException e) {
} catch (IOException e) {
} finally {
try {
is.close();
bis.close();
} catch (IOException e) {
}
}
return null;
}
};
*/
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pic);
final ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
///////////
try {
url = new URL("http://192.168.0.30/03.jpg");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new MyPicGetTask().execute(url);
image.setImageBitmap(bmp);
}
});
////////////////
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.pic, menu);
////////////////
return true;
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d("httpProgress", "Onclick()");
}
}

Add Log.d() code to doInBackground(...) to print out all exceptions that occur. That should tell you what's going wrong, e.g.
try {
URLConnection conn = url .openConnection();
conn.connect();
is = conn.getInputStream();
bis = new BufferedInputStream( is );
bmp = BitmapFactory.decodeStream( bis );
} catch (Exception e) {
Log.d("Async","EXCEPTION",e);
} finally {
try {
is.close();
bis.close();
} catch (IOException e) {
Log.d("Close","EXCEPTION",e);
}
}

When the MyPicGetTask is an inner class it has access to the bmp field. When you pulled it out of your activity it lost access to the bmp class field.
I would suggest reading Google's documentation and following their examples for AsyncTasks.

The bitmap you return from doInBackground should then be used to update your UI in onPostExecute.
protected void onPostExecute(Bitmap bitmap) {
image.setImageBitmap(bitmap);
}
Your asyncTask subclass needs access to image in order to update the UI, so having it as a inner class is one way to make sure it can do this.

Your AsyncTask if you're using it as a public class outside the activity in which you are calling it needs to recieve the context of that activity. There are a number of posts here, here and here that explain how to set this up.

Creating a bitmap from png file stored at sdcard (Android)

Im trying to create a Bitmap from a Png file stored on the SD card and then set that Bitmap in an imageView.
But its not working.
Here's the code:
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import com.pxr.tutorial.xmltest.R;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.widget.ImageView;
public class Getbackground {
URL url;
public static long downloadFile(URL url2) {
try {
URL url = new URL ("http://oranjelan.nl/oranjelan-bg.png");
InputStream input = url.openStream();{
try {
File fileOnSD=Environment.getExternalStorageDirectory();
String storagePath = fileOnSD.getAbsolutePath();
OutputStream output = new FileOutputStream (storagePath + "/oranjelanbg.png");
try {
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
output.write(buffer, 0, bytesRead);
}
} finally {
output.flush();
output.close();
//----------------------------------------------------------------------------------------------------------
Bitmap BckGrnd = BitmapFactory.decodeFile(storagePath + "/oranjelanbg.png");
ImageView BackGround=(ImageView)findViewById(R.id.imageView1);
BackGround.setImageBitmap(BckGrnd);
//----------------------------------------------------------=-----------------------------------------------
}
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
try {
input.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
} catch (MalformedURLException ex) {
throw new RuntimeException(ex);
} catch (IOException e) {
throw new RuntimeException(e);
}
return 0;
}
//-----------------------------------------------------------------------------------------
private static ImageView findViewById(int imageview1) {
// TODO Auto-generated method stub
return null;
}
//-----------------------------------------------------------------------------------------
}
The File does load on the SD card succesfully but I cant seem to get the img in the view.

You can't..
ImageView BackGround=(ImageView)findViewById(R.id.imageView1);
BackGround.setImageBitmap(BckGrnd);
How can you get the reference of ImageView in non activity class Getbackground?
You can only update UI component in MainUI Thread and if its in non Activity class then using reference (Context) of that calling activity class only.
So put this code in your Activity class after Getbackground completes.

Image download code works for all image format, issues with PNG format rendering

I am using the code below to download and show image from server to my ImageView
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
public class HTTPTest extends Activity {
ImageView imView;
String imageUrl="http://11.0.6.23/";
Random r= new Random();
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
Button bt3= (Button)findViewById(R.id.get_imagebt);
bt3.setOnClickListener(getImgListener);
imView = (ImageView)findViewById(R.id.imview);
}
View.OnClickListener getImgListener = new View.OnClickListener()
{
#Override
public void onClick(View view) {
// TODO Auto-generated method stub
//i tried to randomize the file download, in my server i put 4 files with name like
//png0.png, png1.png, png2.png so different file is downloaded in button press
int i =r.nextInt(4);
downloadFile(imageUrl+"png"+i+".png");
Log.i("im url",imageUrl+"png"+i+".png");
}
};
Bitmap bmImg;
void downloadFile(String fileUrl){
URL myFileUrl =null;
try {
myFileUrl= new URL(fileUrl);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
int length = conn.getContentLength();
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
imView.setImageBitmap(bmImg);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
This code works file for all format of images but when it comes to PNG it wont let the image transparent after download and displaying on ImageView.
Any idea?

I dont know it will be a solution for you or not
But you can use a Drawable instead of Bitmap
Here is the code
void downloadFile(String fileUrl) {
try{
InputStream is = (InputStream) new URL(fileUrl).getContent();
Drawable d = Drawable.createFromStream(is, "src name");
imgView.setImageDrawable(d);
} catch (IOException e) {
e.printStackTrace();
}
}
This will show a png correctly