BaseAdapter Tutorial With Example In Android Studio Android Solution | BaseAdapter

BaseAdapter Tutorial With Example In Android Studio

Before we share BaseAdapter it is first critical to change Adapter. In android, a connector is a scaffold between UI part and information source that causes us to fill information in the UI segment. It holds the information and send the information to connector see at that point view can takes the information from the connector view and demonstrates the information on various perspectives like as rundown see, lattice see, spinner and so forth. For more customization of perspectives we utilizes the base connector. Presently lets examine BaseAdapter class.

·         BaseAdapter is a typical base class of a general usage of an Adapter that can be utilized in ListView, GridView, Spinner and so forth.

·         At whatever point you require a tweaked rundown in a ListView or redid lattices in a GridView you make your very own connector and broaden base connector in that.

·         Base Adapter can be reached out to make a custom Adapter for showing a custom rundown thing.

Critical Note: ArrayAdapter is additionally a usage of BaseAdapter.

Here is the code of Custom Adapter when we expands the BaseAdapter in that:

public class CustomAdapter broadens BaseAdapter { @Override public int getCount() { return 0; } @Override public Object getItem(int I) { return invalid; } @Override public long getItemId(int I) { return 0; } @Override public View getView(int I, View see, viewGroup) { return invalid; }

In the above code piece we see the overrided techniques for BaseAdapter which are utilized to set the information in a rundown, network or a spinner. From that point we for the most part utilized two capacities getCount() and getView().

We should talk about every one of these capacities in detail:

1. getCount():

The getCount() work restores the aggregate number of things to be shown in a rundown. It tallies the incentive from exhibit list measure() strategy or a cluster's length. For instance, in the event that we have a rundown of components in an arraylist and we need to show the things in a rundown see then we can check the aggregate number of components utilizing the size capacity and afterward that whole number esteem is returned by the capacity getCount() as demonstrated as follows.

@Override public int getCount() { int count=arrayList.size();/tallies the aggregate number of components from the arrayList return tally;//restores the aggregate tally to connector }

2. getView(int I, View see, viewGroup):

This capacity is naturally considered when the rundown thing view is prepared to be shown or going to be shown. In this capacity we set the design for rundown things utilizing LayoutInflater class and afterward add the information to the perspectives like ImageView, TextView and so forth.

The following is the getView capacity's precedent code with clarification incorporated into which we set the format utilizing LayoutInflater and afterward get the view's id and actualize them.

@Override public View getView(int I, View see, viewGroup) { view  = inflter.inflate(R.layout.activity_gridview, invalid);//set format for showing things ImageView symbol = (ImageView) view.findViewById(R.id.icon);//get id for picture see icon.setImageResource(flags[i]);//set picture of the thing's return view; }

3. getItem(int I):

This capacity is utilized to Get the information thing related with the predefined position in the informational collection to get the comparing information of the explicit area in the gathering of information things.

The following is the precedent code in which we restores the exhibit rundown's thing as indicated by position.

@Override public Object getItem(int I) { return arrayList.get(i); }

4. getItemId(int I):

With respect to the getItemId (int position), it restores the relating to the position thing ID. The capacity restores a long estimation of thing position to the connector.

The following is the code in which we restores the position.

@Override public long getItemId(int I) { return I; }

BaseAdapter Example In Android Studio:

Example 1: Example of BaseAdapter for showing Animal pictures in matrices utilizing GridView.

In the underneath example we show creatures pictures as matrices utilizing custom connector to demonstrate the utilization of BaseAdapter. The following is the last yield and code with clarification:

Stage 1: Create another venture and name it BaseAdapterExample.

Stage 2: Now open res - > design - > activity_main.xml (or) main.xml and include following code. Here we will make Gridview inside LinearLayout:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <GridView android:id="@+id/simpleGridView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:footerDividersEnabled="false" android:numColumns="3"/> </LinearLayout>

Stage 3: Create another Activity activity_gridview.xml inside design and include the beneath code:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ImageView android:id="@+id/symbol" android:layout_width="100dp" android:layout_height="100dp" android:scaleType="fitXY" android:layout_margin="5dp" android:layout_gravity="center_horizontal"/> </LinearLayout>

Stage 3: Now open application - > java - > package - > MainActivity.java and include the beneath code. Ensure you have pictures spared in drawable envelope with the names we have utilized or else change the name dependent on the pictures present in your drawable organizer.

package example.abhiandriod.baseadapterexample; import android.app.Activity; import android.os.Bundle; import android.widget.GridView; public class MainActivity broadens Activity { GridView simpleGrid; int animals[] = {R.drawable.animal13, R.drawable.animal14, R.drawable.animal15, R.drawable.animal16, R.drawable.animal17, R.drawable.animal18, R.drawable.animal15, R.drawable.animal16, R.drawable.animal17}; @Override ensured void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); simpleGrid = (GridView) findViewById(R.id.simpleGridView); customAdapter = new CustomAdapter(getApplicationContext(), creatures); simpleGrid.setAdapter(customAdapter); } }

Stage 4: Create another class CustomAdapter.java inside package and include the accompanying code

package example.abhiandriod.baseadapterexample;/Use your package import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; public class CustomAdapter broadens BaseAdapter { Setting; int animals[]; LayoutInflater inflter; public CustomAdapter(Context applicationContext, int[] creatures) { this.context = applicationContext; this.animals = creatures; inflter = (LayoutInflater.from(applicationContext)); } @Override public int getCount() { return animals.length; } @Override public Object getItem(int I) { return invalid; } @Override public long getItemId(int I) { return 0; } @Override public View getView(int I, view, viewGroup) { view = inflter.inflate(R.layout.activity_gridview, invalid); ImageView symbol = (ImageView) view.findViewById(R.id.icon); icon.setImageResource(animals[i]); return view; } }

OutPut :-

Example 2: Example of BaseAdapter to show rundown of nations in a ListView utilizing Custom BaseAdapter

In the beneath example we show rundown of nations with their banners utilizing custom connector to demonstrate the utilization of BaseAdapter. The following is the last yield and code with clarification well ordered.

Stage 1: Create another task in Android Studio and name it BaseAdapterExample

Select File - > New - > New Project. Fill the structures and snap "Complete" catch.

Stage 2: Now Open application - > res - > format - > activity_main.xml (or) main.xml and include following code :

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ListView android:id="@+id/simpleListView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:divider="@color/material_blue_grey_800" android:dividerHeight="1dp" android:footerDividersEnabled="false"/> </LinearLayout>

Stage 3: Now make another XML format. For our situation, we name it as activity_listview.xml. Include the beneath code in it. Likewise ensure you have iclauncher picture spared in drawable envelope or include it.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <ImageView android:id="@+id/symbol" android:layout_width="50dp" android:layout_height="50dp" android:src="@drawable/ic_launcher"/> <TextView android:id="@+id/textView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:padding="@dimen/activity_horizontal_margin" android:textColor="#000"/> </LinearLayout>

Stage 4: Now open application - > java-> package - > MainActivity.java and include the underneath code.

package example.abhiandriod.baseadapterexample; import android.app.Activity;                                                            import android.os.Bundle; import android.widget.ListView; public class MainActivity expands Activity { ListView simpleList; String countryList[] = {"India", "China", "australia", "Portugle", "America", "NewZealand"}; int flags[] = {R.drawable.india, R.drawable.china, R.drawable.australia, R.drawable.portugle, R.drawable.america, R.drawable.new_zealand}; @Override ensured void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); simpleList = (ListView) findViewById(R.id.simpleListView); customAdapter = new CustomAdapter(getApplicationContext(), countryList, banners); simpleList.setAdapter(customAdapter); } }

Stage 4: Create new class CustomAdapter.java and include following code

package example.abhiandriod.baseadapterexample; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class CustomAdapter broadens BaseAdapter { Setting; String countryList[]; int flags[]; LayoutInflater inflter; public CustomAdapter(Context applicationContext, String[] countryList, int[] banners) { this.context = setting; this.countryList = countryList; this.flags = banners; inflter = (LayoutInflater.from(applicationContext)); } @Override public int getCount() { return countryList.length; } @Override public Object getItem(int I) { return invalid; } @Override public long getItemId(int I) { return 0; } @Override public View getView(int I, view, viewGroup) { view = inflter.inflate(R.layout.activity_listview, invalid); TextView nation = (TextView) view.findViewById(R.id.textView); ImageView symbol = (ImageView) view.findViewById(R.id.icon); country.setText(countryList[i]); icon.setImageResource(flags[i]); return view; } }

OutPut :-