Recycler View in Android

Recycler view in android is use for show data like a listview .

add build gradel : 

compile 'com.android.support:recyclerview-v7:24.1.1'

XML Define RecyclerView

<android.support.v7.widget.RecyclerView   
 android:id="@+id/recycler_view"    
android:layout_width="match_parent" 
   android:layout_height="match_parent"
    android:scrollbars="none"/>

RecyclerView mRecyclerView;
LinearLayoutManager linearLayoutManager;

ArrayList<Model> arrayList = null;

Initialize : 

arrayList = new ArrayList<>();  // array initialize

mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(linearLayoutManager);


arrayList.add(new Model("Android")); // add static data to array
arrayList.add(new Model("iPhone"));
arrayList.add(new Model("Window"));
arrayList.add(new Model("Blackberry"));
arrayList.add(new Model("Symbion"));


adapter = new CustomAdapter(this, arrayList); // show data
mRecyclerView.setAdapter(adapter);  // set adapter

Now discuss about adapter :  

class CustomAdapter extends RecyclerView.Adapter<CustomAdapter .ViewHolder> {

    ArrayList<HomeModel> arrayList;

    public CustomAdapter (ArrayList<HomeModel> arrayList) {
        this.arrayList = arrayList;
    }

    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.row, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override    public void onBindViewHolder(final ViewHolder viewHolder, final int position) {
       viewHolder.title.setText(arrayList.get(position).getTitle());

    }

    @Override    public int getItemCount() {
        return arrayList.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {
        TextView title;

        public ViewHolder(View convertView) {
            super(convertView);
            title = (TextView) convertView.findViewById(R.id.title);
        }
    }

Custom Model Class

lass HomeModel {

    String title;

    public HomeModel(String title) {
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

Get Path from Uri and get Uri from path in Android

In android taking pic from camera or pic image from sd card, we get response in OnActivityResult  in form of data (Intent) so get path from data we use this method.

Uri imageUri = data.getData();

Generate Local Notification in Android

Generate local notification like Remainder or other scheduling task.

Call generateNotification Method and set Title and Message.

Generate Local Notification

private void generateNotification(Context context, String title,String message) {
int requestId = (int) System.currentTimeMillis();
try {
int icon = R.drawable.ic_launcher; // set icon
Intent intent = new Intent(context, MainActivity.class);
PendingIntent resultPendingIntent = PendingIntent.getActivity(
context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
context);
Notification notification = mBuilder
.setSmallIcon(icon)
.setTicker(title)
.setWhen(0)
.setAutoCancel(true)
.setContentTitle(title)
.setStyle(
new NotificationCompat.BigTextStyle()
.bigText(message))
.setContentIntent(resultPendingIntent)
.setSound(
RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
.setLargeIcon(
BitmapFactory.decodeResource(
context.getResources(), icon))
.setContentText(message).build();

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
| Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.defaults |= Notification.DEFAULT_SOUND;
notification.defaults |= Notification.DEFAULT_VIBRATE;

NotificationManager notificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(requestId, notification);
} catch (Exception e) {
}

}

Show Notification

Send Notification

Color Change On Click in Android

when click on Button or TextView or may be layout, when click then change background color. purpose of this, user can detect click or not on button.

when press button then color should be changed.

Save Value in SharedPreferences 

In Android Save Value in key pair format we use SharedPreferences.

       SharedPreferences     myPrefs = getSharedPreferences("TAG", MODE_PRIVATE);
SharedPreferences.Editor myEditor = myPrefs.edit();

save value

      myEditor.putString("name", abc); // key pair
       myEditor.commit();

Save Boolean Value

      myEditor.putBoolean("key", abc); // key pair

       myEditor.commit();

Get Boolean Value 

boolean status= myEditor.getBoolean(key, false);

Get Save value 

     String name = myPrefs.getString("name", "");

JSON Parsing in Android

Parse data from server is many type like XML,DOM and JSON but JSON Parsing widely used, this topic we discuss JSON PARSING.

How to Parse JSON Object:

first we get data from server afterthat we parse, in JSON start with Object or Array.

{ }   =   Object

[ ]  = Array

so we check data is object or array.

    String result=  {"response":"100","data" : "Sucess"} 

It is start with object so first object parse then string.

try {
    JSONObject json = new JSONObject(result);

       String response= json.getString("response");                                   

       String data= json.getString("data");      

} catch (JSONException e) {
    e.printStackTrace();
}

we get response = 100;

and data= Sucess

Show Google Ads in Android(AdMob)

show advertising in android mobile like banner or full screen add.

AdMob in Android

First we need id for ads open https://apps.admob.com/ and monetise application . there are basically two type of ads .

First: Banner Ad (show banner at top or bottom)
Second Full Screen Ad(Interstitial Ads)

Banner Ad show

banner can be adjust according to app it may be top or bottom

add  Google Play Library 

        AdView mAdView = (AdView) findViewById(R.id.adViewHOME);

        AdRequest adRequest = new AdRequest.Builder().build();

        mAdView.loadAd(adRequest);

AdMob XML File  :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
     <com.google.android.gms.ads.AdView
        android:id="@+id/adMob"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        ads:adSize="SMART_BANNER"
        ads:adUnitId="YOUR BANNER ID" >
    </com.google.android.gms.ads.AdView>

</RelativeLayout>

Manifest Permission

you must have set  internet permission.

 <uses-permission android:name="android.permission.INTERNET" />

Full Screen Ads : 

InterstitialAd mInterstitialAd;
AdRequest adRequestFull;

mInterstitialAd = new InterstitialAd(this);
mInterstitialAd.setAdUnitId("YOUR ID");

adRequestFull = new AdRequest.Builder() .addTestDevice(AdRequest.DEVICE_ID_EMULATOR) .build();
mInterstitialAd.loadAd(adRequestFull);

Open Right to Left Navigation Drawer Android

open right to left Navigation Drawer in android fragment activity. it is similar to left to right as we discuss http://invokecode.blogspot.com/2015/11/custom-navigation-drawer-in-android.html
but in this we need to change line.

?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 

    xmlns:ads="http://schemas.android.com/apk/res-auto"

    android:layout_width="fill_parent"  

    android:layout_height="fill_parent">
    <android.support.v4.widget.DrawerLayout 

       android:id="@+id/drawer_layout" 

       android:layout_width="fill_parent"  

       android:layout_height="match_parent">
        <FrameLayout 

           android:id="@+id/content_frame_Home"            

           android:layout_width="match_parent"      

           android:layout_height="match_parent"/>
        <RelativeLayout  

          android:id="@+id/left_relative"   

          android:layout_width="300dp"   

          android:layout_height="wrap_content" 

           android:layout_gravity="start">
            <include layout="@layout/slider" />
        </RelativeLayout>
    </android.support.v4.widget.DrawerLayout>
</RelativeLayout> 

android:layout_gravity="start"   change to  android:layout_gravity="end"
in Coding we need to change GRAVITY LEFT To Right..
DrawerLayout drawerLayout;
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerLayout.openDrawer(Gravity.RIGHT);

Use Weight in Linear Layout Android

use weight for equal child of layout. margin and padding unable to set equal child because when multi screen support and margin and padding set fix, but in weight they remains same in all layout.

In Linear Layout need orientation horizontal and vertical.

XML for Linear layout weight.

<LinearLayout    

     android:layout_width="fill_parent" 

     android:layout_height="wrap_content" 

     android:layout_marginTop="50dp" 

     android:layout_marginLeft="20dp"

     android:layout_marginRight="20dp"

     android:orientation="horizontal">

    <TextView       

       android:layout_width="0dp" 

       android:layout_weight="1" 

       android:layout_height="wrap_content" 

       android:text="FIRST"   

       android:gravity="center"  

       android:textSize="20sp"  

       android:textColor="#000000"/>

    <TextView  

      android:layout_width="0dp"   

      android:layout_weight="1"    

      android:layout_height="wrap_content"  

      android:text="SECOND"   

      android:gravity="center"   

      android:layout_marginLeft="20dp"

      android:textSize="20sp"   

     android:textColor="#000000"/>

</LinearLayout>

View Pager in android

View Pager-scroll page (slide) call view pager.

ViewPager pager;

private ArrayList<ModelClassPager> arrayOfPager;

                  pager1 = (ViewPager)findViewById(R.id.pager);
arrayOfPager = new ArrayList<ModelClass>();

arrayOfPager.add(new ModelClass(R.drawable.first));
arrayOfPager.add(new ModelClass(R.drawable.second));
arrayOfPager.add(new ModelClass(R.drawable.third));
                arrayOfPager.add(new ModelClass(R.drawable.four));

PagerAdapter  pagerAdapter = new PagerAdapter  (MainActivity.this,arrayOfPager);

pagerAdapter .setAdapter(pagerAdapter);

Custom Adapter for View Pager:

PagerAdapter   extends PagerAdapter {

LayoutInflater inflates;
ArrayList<ModelClass> arrayOfPager;

Context context;

public PagerAdapter   (Context context,
ArrayList<ModelClass> arrayOfPager_) {
this.context = context;
this.arrayOfPager = arrayOfPager_;
inflates = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
return arrayOfPager.size();
}

public Object instantiateItem(View collection, int position) {

ViewGroup container = null;
ImageView pgrImage;
View viewPgaer = inflates.inflate(R.layout.row_pager, null);

pgrImage = (ImageView)viewPgaer
.findViewById(R.id.pagerImage);

pgrImage.setImageResource(arrayOfPager.get(position).getPagerImg());

((ViewPager) collection).addView(viewPgaer, 0);

return viewPgaer;
}

public void destroyItem(View collection, int position, Object view) {
((ViewPager) collection).removeView((View) view);
}

public boolean isViewFromObject(View view, Object object) {
return view == (object);
}

public void finishUpdate(View arg0) {
}

@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}

@Override
public Parcelable saveState() {
return null;
}

@Override
public void startUpdate(View arg0) {
}

}

Model Class (Gettor Settor Class):

public class ModelClassPager {

int pagerImg = 0;

public int getPagerImg() {

return pagerImg;

}

public void setPagerImg(int pagerImg) {

this.pagerImg = pagerImg;

}

public ModelClassPager( int pagerImg_) {

// TODO Auto-generated constructor stub

pagerImg = pagerImg_;

}

}

XML Design For View Pager:

   <android.support.v4.view.ViewPager
        android:id="@+id/pagesCustmLayoutMAIN"
        android:layout_width="fill_parent"
        android:layout_height="160dp" />

Custom Navigation Drawer in Android

Create Navigation Drawer in android using fragment.

Navigation Drawer

DrawerLayout drawerLayout;

drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

// On drawerLayout click open and close


public void openDrawable() {
// TODO Auto-generated method stub
optionMenuStr="open";
//menuImage.setBackgroundResource(R.drawable.backk);
drawerLayout.openDrawer(Gravity.LEFT);
}

public void closeDrawable() {
// TODO Auto-generated method stub
optionMenuStr="close";
menuImage.setBackgroundResource(R.drawable.menu);
drawerLayout.closeDrawers();
}

Disable Swipe Open  Navigation Drawer Android:

Disable Swipe Open Navigation Drawer, sometime we use fragment and BaseActivity is same and fragment are different then in other fragments we need to stop swipe open Drawer then use this code.

drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);

Disable to Able Swipe Open  Navigation Drawer Android:

if one you have disable swipe open then again it need to open else it not working.

drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);

XML Design.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer_layout"
        android:layout_width="fill_parent"
        android:layout_height="match_parent" >

        <FrameLayout
            android:id="@+id/content_frame_Home"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <RelativeLayout
            android:id="@+id/left_relative"
            android:layout_width="300dp"
            android:layout_height="wrap_content"
            android:layout_gravity="start" >

            <include layout="@layout/slider" />
        </RelativeLayout>
    </android.support.v4.widget.DrawerLayout>

</RelativeLayout>

Show Google Map V2 in FragmentActivity Android.

show google map v2 in fragment activity, we need SupportMapFragment for it and fragment in xml file.

Google Map in Android

private GoogleMap googleMap;

SupportMapFragment supportMapFrag=(SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);

googleMap=supportMapFrag.getMap();

            /*set map type*/
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

xml layout for map:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

  <fragment

      android:id="@+id/map"

      android:layout_width="fill_parent"

      android:layout_height="fill_parent"

      class="com.google.android.gms.maps.SupportMapFragment" />

</RelativeLayout>

add Google Play Service library and gilve all permission in manifest.

    <permission

        android:name="com.googlemap.permission.MAPS_RECEIVE"

        android:protectionLevel="signature" />

    <uses-permission android:name="YOUR_PACKAGE_NAME.MAPS_RECEIVE" />

    <uses-permission android:name="android.permission.INTERNET" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <uses-feature

        android:glEsVersion="0x00020000"

        android:required="true" />

before Application Tag add these.

 <meta-data

            android:name="com.google.android.gms.version"

            android:value="@integer/google_play_services_version" />

        <meta-data

            android:name="com.google.android.maps.v2.API_KEY"

            android:value="YOUR API KEY" />

Multi Color in Single TextView Android

How To set  Multi Color in Single TextView:

programatically we can set multi color text in single TextView, first part of text show different color and other part show different color. dynamically set text on TextView.

TextView textView;

textView.setText(Html.fromHtml("<font color='#4CAF50'> Android</font> <font color='#0091EA'>Developer</font>"));

in above code first part "Android" show green color and "Developer" show blue color. so like that we can set dynamically multi color in single Textview.

Alert Dialog in Android

show alert dialog in Android for validation or other purpose, show alert dialog with message and when click on Ok then Dismiss.

it pop up on screen and display message.

Context context;
String message;
AlertDialog alert = null;

AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage(message)
      .setCancelable(false)
      .setPositiveButton("OK", new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog, int id) {
          alert.dismiss();
          }
      });
alert = builder.create();
alert.show();
}

Show Image Using Picasso in Android

Picasso is powerful Image Loading Library in Android, it caching image and manage memory automatically and large image easily handle in Android.

Working with Images In Android:

In Android handle many Image and manage them is complex, some time "Out Of Memory Error Occur" due to large size Images and we need to recycle and free memory after image load.

Get Gmail Address Of User In Android Programatically

In Android get user gmail address programatically in android using AccountManager.

    try {
AccountManager accountManager = AccountManager.get(context);
Account[] accountsEmail = accountManager.getAccountsByType("com.google");
Account email = accountsEmail[0];
return email.name;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Search in Listview Android

Search inside listview using addTextChangedListener , in listview when EditText we search then below list show related search  list data. 

Hide Keyboard in Android

Hide keyboard in android on button click or layout click some time we notice that after enter data in edittext when click button then still show keyboard on eittext, we need to hide keyboard on button click.

some time we switch one activity to another activity then if keyboard open in first activity then it also show in second activity.

Hide keyboard android

Data store and retrieve in android using sqlite database

Store Data in SQLite Database Android:

many ways to storage data in android like Share Preference and other but store data using SQLite is parmanent and can be in many format. In Share Preference save data in key-value pair.

For SQLite we extend SQLiteOpenHelper and @Override write query and save data.

Add Data in Android Using SQLite Database 

Passing Data Between Activities in Android

passing data from one activity to another activity in android using intent.

Suppose two Activity : FirstActivity and SecondActivity. if we want to send data from FirstActivity  to SecondActivity  then we move from another activity using Intent 

We Send data in key-value form.