Android

Create Custom TextView with custom fonts

public class MyTextView extends TextView {

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyTextView(Context context) {
        super(context);
        init();
    }

    private void init() {
        if (!isInEditMode()) {
            Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Lato-Regular.ttf");
            setTypeface(tf);
        }
    }

}

public class MyTextView extends TextView {

public MyTextView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

init();

}

public MyTextView(Context context, AttributeSet attrs) {

super(context, attrs);

init();

}

public MyTextView(Context context) {

super(context);

init();

}

private void init() {

if (!isInEditMode()) {

Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Lato-Regular.ttf");

setTypeface(tf);

}

in xml file

 <customfonts.MyTextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="16dp"
                    android:gravity="center"
                    android:text="Stories to read"
                    android:textColor="#757575"
                    android:textSize="16dp" />

<customfonts.MyTextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="16dp"

android:gravity="center"

android:text="Stories to read"

android:textColor="#757575"

android:textSize="16dp" />

where “customfonts.MyTextView” is package and class name

shubham sharma December 16, 2016 Read More

Using Android intents to share a link

 Intent intent = new Intent(Intent.ACTION_SEND);
                      intent.setType("text/plain");
                      intent.putExtra(Intent.EXTRA_TEXT, "http://www.techrepublic.com");
                      intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Check out this site!");
startActivity(Intent.createChooser(intent, "Share"));

Intent intent = new Intent(Intent.ACTION_SEND);

intent.setType("text/plain");

intent.putExtra(Intent.EXTRA_TEXT, "http://www.techrepublic.com");

intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Check out this site!");

startActivity(Intent.createChooser(intent, "Share"));

shubham sharma December 10, 2016 Read More

Copy Assets to Extrenal file

////////////////////////////
private void copyAssets() {
    AssetManager assetManager = getActivity().getAssets();
    String[] files = null;
    try {
        files = assetManager.list("");
    } catch (IOException e) {
        Log.e("tag", "Failed to get asset file list.", e);
    }
    if (files != null) for (String filename : files) {
        InputStream in = null;
        OutputStream out = null;
        try {
            in = assetManager.open(filename);
            File outFile = new File(getActivity().getExternalFilesDir(null), filename);
            out = new FileOutputStream(outFile);
            copyFile(in, out);
        } catch(IOException e) {
            Log.e("tag", "Failed to copy asset file: " + filename, e);
        }
        finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // NOOP
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    // NOOP
                }
            }
        }
    }
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while((read = in.read(buffer)) != -1){
        out.write(buffer, 0, read);
    }
}

////////////////////////////

private void copyAssets() {

AssetManager assetManager = getActivity().getAssets();

String[] files = null;

try {

files = assetManager.list("");

} catch (IOException e) {

Log.e("tag", "Failed to get asset file list.", e);

}

if (files != null) for (String filename : files) {

InputStream in = null;

OutputStream out = null;

try {

in = assetManager.open(filename);

File outFile = new File(getActivity().getExternalFilesDir(null), filename);

out = new FileOutputStream(outFile);

copyFile(in, out);

} catch(IOException e) {

Log.e("tag", "Failed to copy asset file: " + filename, e);

}

finally {

if (in != null) {

try {

in.close();

} catch (IOException e) {

// NOOP

}

if (out != null) {

try {

out.close();

} catch (IOException e) {

// NOOP

}

private void copyFile(InputStream in, OutputStream out) throws IOException {

byte[] buffer = new byte[1024];

int read;

while((read = in.read(buffer)) != -1){

out.write(buffer, 0, read);

}

shubham sharma December 9, 2016 Read More

Android Storage system to access the path of External and Internal files and folders.

Android Storage system to access the path of External and Internal files and folders. Android uses more than one file system (think of “multiple drives/partitions” when comparing with your computer, while sharing a common base, directory structures might differ between manufacturers. What is a file system? A file system (or filesystem) is an abstraction to […]

shubham sharma December 9, 2016 Read More

Add code to print out the key hash

// Add code to print out the key hash
    try {
        PackageInfo info = getPackageManager().getPackageInfo(
                "com.facebook.samples.hellofacebook", 
                PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
    } catch (NameNotFoundException e) {
        
    } catch (NoSuchAlgorithmException e) {
        
    }

// Add code to print out the key hash

try {

PackageInfo info = getPackageManager().getPackageInfo(

"com.facebook.samples.hellofacebook",

PackageManager.GET_SIGNATURES);

for (Signature signature : info.signatures) {

MessageDigest md = MessageDigest.getInstance("SHA");

md.update(signature.toByteArray());

Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));

}

} catch (NameNotFoundException e) {

} catch (NoSuchAlgorithmException e) {

}

shubham sharma December 9, 2016 Read More

Animation in recyclerview

Inside Adapter class

    /**
     * Here is the key method to apply the animation
     */
    private void setAnimation(View viewToAnimate, int position) {
        // If the bound view wasn't previously displayed on screen, it's animated
        if (position > lastPosition) {
            Animation animation = AnimationUtils.loadAnimation(mainContext, android.R.anim.slide_in_left);
            viewToAnimate.startAnimation(animation);
            lastPosition = position;
        }
    }

/**

* Here is the key method to apply the animation

private void setAnimation(View viewToAnimate, int position) {

// If the bound view wasn't previously displayed on screen, it's animated

if (position > lastPosition) {

Animation animation = AnimationUtils.loadAnimation(mainContext, android.R.anim.slide_in_left);

viewToAnimate.startAnimation(animation);

lastPosition = position;

}

 @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {

        holder.cat_name.setText(categoryList.get(position).getName());

        // Here you apply the animation when the view is bound
        // setAnimation(holder.container, position);


    }

@Override

public void onBindViewHolder(MyViewHolder holder, int position) {

holder.cat_name.setText(categoryList.get(position).getName());

// Here you apply the animation when the view is bound

// setAnimation(holder.container, position);

}

Where holder is main container (Relative Layout)

shubham sharma December 8, 2016 Read More

how to validate a URL / website name in EditText in Android?

 Patterns.WEB_URL.matcher(potentialUrl).matches()

1	Patterns.WEB_URL.matcher(potentialUrl).matches()

shubham sharma December 7, 2016 Read More

How to implement onBackPressed() & intents in fragment?

public boolean onKeyDown(int keyCode, KeyEvent event) {

        switch (keyCode) {
            case KeyEvent.KEYCODE_BACK:
                String cameback="CameBack";
                intent = new Intent(getActivity(),HomeActivity.class);
                intent.putExtra("Comingback", cameback);
                startActivity(intent);
                return true
    }
            return false;
}

public boolean onKeyDown(int keyCode, KeyEvent event) {

switch (keyCode) {

case KeyEvent.KEYCODE_BACK:

String cameback="CameBack";

intent = new Intent(getActivity(),HomeActivity.class);

intent.putExtra("Comingback", cameback);

startActivity(intent);

return true

}

return false;

}

shubham sharma December 5, 2016 Read More

.dex file in android

Compiled Android application code file. Android programs are compiled into .dex (Dalvik Executable) files, which are in turn zipped into a single .apk file on the device. .dex files can be created by automatically by Android translating compiled applications written in the Java programming language.

shubham sharma November 12, 2016 Read More

Android: What is the best HTTP library for uploading images to server? [closed]

AndroidAsync – https://github.com/koush/AndroidAsync android-async-http – https://github.com/loopj/android-async-http okhttp – https://github.com/square/okhttp http-request – https://github.com/kevinsawicki/http-request android-volley – https://github.com/mcxiaoke/android-volley ion – https://github.com/koush/ion retrofit– https://github.com/square/retrofit Bolts-Android– https://github.com/BoltsFramework/Bolts-Android The library you mentioned are very different in nature. They can be more or less grouped like this Socket level API: This includes AndroidAsync okhttp HttpClient HttpURLConnection These are very […]

shubham sharma November 10, 2016 Read More

New Dev Point

Some problems explained

Android

Create Custom TextView with custom fonts

Copy Assets to Extrenal file

Android Storage system to access the path of External and Internal files and folders.

Add code to print out the key hash

Animation in recyclerview

how to validate a URL / website name in EditText in Android?

How to implement onBackPressed() & intents in fragment?

.dex file in android

Android: What is the best HTTP library for uploading images to server? [closed]