Android

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

.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

How to set text to view from drawer header layout in navigation drawer without inflating view

u get navigation header view by navigationView.getHeaderView(0) just try below code it works!

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
View header=navigationView.getHeaderView(0);
/*View view=navigationView.inflateHeaderView(R.layout.nav_header_main);*/
name = (TextView)header.findViewById(R.id.username);
email = (TextView)header.findViewById(R.id.email);
name.setText(personName);
email.setText(personEmail);

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);

navigationView.setNavigationItemSelectedListener(this);

View header=navigationView.getHeaderView(0);

/*View view=navigationView.inflateHeaderView(R.layout.nav_header_main);*/

name = (TextView)header.findViewById(R.id.username);

email = (TextView)header.findViewById(R.id.email);

name.setText(personName);

email.setText(personEmail);

shubham sharma November 7, 2016 Read More

How to use putExtra() and getExtra() for string data

Use this to “put” the file…

Intent i = new Intent(FirstScreen.this, SecondScreen.class);   
String strName = null;
i.putExtra("STRING_I_NEED", strName);

Intent i = new Intent(FirstScreen.this, SecondScreen.class);

String strName = null;

i.putExtra("STRING_I_NEED", strName);

Then, to retrieve the value try something like:

String newString;
if (savedInstanceState == null) {
    Bundle extras = getIntent().getExtras();
    if(extras == null) {
        newString= null;
    } else {
        newString= extras.getString("STRING_I_NEED");
    }
} else {
    newString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}

String newString;

if (savedInstanceState == null) {

Bundle extras = getIntent().getExtras();

if(extras == null) {

newString= null;

} else {

newString= extras.getString("STRING_I_NEED");

}

} else {

newString= (String) savedInstanceState.getSerializable("STRING_I_NEED");

}

shubham sharma November 7, 2016 Read More

Open Intent

WebBrowser

Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse());
startActivity(browserIntent);

1 2	Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse()); startActivity(browserIntent);

YouTube

// your video id
// for instance a video link: http://www.youtube.com/watch?v=Q9hF0j9G8_M
String videoId = "Q9hF0j9G8_M"; 
 
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube:" + videoId));
intent.putExtra("VIDEO_ID", videoId);
startActivity(intent);

// your video id

// for instance a video link: http://www.youtube.com/watch?v=Q9hF0j9G8_M

String videoId = "Q9hF0j9G8_M";

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube:" + videoId));

intent.putExtra("VIDEO_ID", videoId);

startActivity(intent);

shubham sharma October 24, 2016 Read More

shared preference

String sPNotes = getPreferences(Context.MODE_PRIVATE).getString("NOTES", "EMPTY");

1	String sPNotes = getPreferences(Context.MODE_PRIVATE).getString("NOTES", "EMPTY");

 // 1. Called before Android kills an application, but doesn't protect you
    // if the user kills the app or restarts the device
    @Override
    protected void onSaveInstanceState(Bundle outState) {
 
        // Save the value in the EditText using the key NOTES
        outState.putString("NOTES","Your string");
 
        super.onSaveInstanceState(outState);
    }

// 1. Called before Android kills an application, but doesn't protect you

// if the user kills the app or restarts the device

@Override

protected void onSaveInstanceState(Bundle outState) {

// Save the value in the EditText using the key NOTES

outState.putString("NOTES","Your string");

super.onSaveInstanceState(outState);

}

 // 2. Will save key value pairs to SharedPreferences
    private void saveSettings(){
 
        // SharedPreferences allow you to save data even if the user kills the app
        // MODE_PRIVATE : Preferences shared only by your app
        // MODE_WORLD_READABLE : All apps can read
        // MODE_WORLD_WRITABLE : All apps can write
        // edit() allows us to enter key vale pairs
        SharedPreferences.Editor sPEditor = getPreferences(Context.MODE_PRIVATE).edit();
 
        // Add the key "NOTES" and assign it to the value
        sPEditor.putString("NOTES", notesEditText.getText().toString());
 
        // Save the shared preferences
        sPEditor.commit();
 
    }

// 2. Will save key value pairs to SharedPreferences

private void saveSettings(){

// SharedPreferences allow you to save data even if the user kills the app

// MODE_PRIVATE : Preferences shared only by your app

// MODE_WORLD_READABLE : All apps can read

// MODE_WORLD_WRITABLE : All apps can write

// edit() allows us to enter key vale pairs

SharedPreferences.Editor sPEditor = getPreferences(Context.MODE_PRIVATE).edit();

// Add the key "NOTES" and assign it to the value

sPEditor.putString("NOTES", notesEditText.getText().toString());

// Save the shared preferences

sPEditor.commit();

}

============================================= Setting values in Preference:

// MY_PREFS_NAME - a static String variable like: 
//public static final String MY_PREFS_NAME = "MyPrefsFile";
SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putString("name", "Elena");
 editor.putInt("idName", 12);
 editor.commit();

// MY_PREFS_NAME - a static String variable like:

//public static final String MY_PREFS_NAME = "MyPrefsFile";

SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();

editor.putString("name", "Elena");

editor.putInt("idName", 12);

editor.commit();

Retrieve data from preference:

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE); 
String restoredText = prefs.getString("text", null);
if (restoredText != null) {
  String name = prefs.getString("name", "No name defined");//"No name defined" is the default value.
  int idName = prefs.getInt("idName", 0); //0 is the default value.
}

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE);

String restoredText = prefs.getString("text", null);

if (restoredText != null) {

String name = prefs.getString("name", "No name defined");//"No name defined" is the default value.

int idName = prefs.getInt("idName", 0); //0 is the default value.

}

Android SharedPreferences in Fragment

// this = your fragment
SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);

1 2	// this = your fragment SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);

shubham sharma October 24, 2016 Read More

Open YouTube Intent

// your video id
// for instance a video link: http://www.youtube.com/watch?v=Q9hF0j9G8_M
String videoId = "Q9hF0j9G8_M"; 
 
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube:" + videoId));
intent.putExtra("VIDEO_ID", videoId);
startActivity(intent);

// your video id

// for instance a video link: http://www.youtube.com/watch?v=Q9hF0j9G8_M

String videoId = "Q9hF0j9G8_M";

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube:" + videoId));

intent.putExtra("VIDEO_ID", videoId);

startActivity(intent);

shubham sharma October 18, 2016 Read More

How do I change the android actionbar title and icon

This is very simple to accomplish If you want to change it in code, call:

setTitle("My new title");
getActionBar().setIcon(R.drawable.my_icon);

1 2	setTitle("My new title"); getActionBar().setIcon(R.drawable.my_icon);

And set the values to whatever you please. Or, in the Android manifest XML file:

<activity android:name=".MyActivity" 
       android:icon="@drawable/my_icon" 
       android:label="My new title" />

<activity android:name=".MyActivity"

android:icon="@drawable/my_icon"

android:label="My new title" />

To enable the back button in your app use:

 getActionBar().setHomeButtonEnabled(true);
 getActionBar().setDisplayHomeAsUpEnabled(true);

1 2	getActionBar().setHomeButtonEnabled(true); getActionBar().setDisplayHomeAsUpEnabled(true);

The code should all be placed in your onCreate so […]

shubham sharma October 15, 2016 Read More

New Dev Point

Some problems explained