Android & lt; gallery drag components from scratch.. & gt;, androidgallery

Learn android <gallery drag component. ..> from scratch, androidgallery

The Gallery component can display images in the Gallery. Play images cyclically in the gallery

The inheritance structure is as follows:

Java. lang. Object
Bytes	Android. view. View
	Bytes	Android. view. ViewGroup
		Bytes	Android. widget. AdapterView <T extends android. widget. Adapter>
			Bytes	Android. widget. AbsSpinner
				Bytes	Android. widget. Gallery

Using the Gallery component, you also need to use the Adapter for Data configuration.

Here we use BaseAdapter for Data configuration

Xml file

<span style="font-size:18px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <Gallery        android:layout_marginTop="20dp"        android:id="@+id/gallery"        android:layout_width="fill_parent"        android:layout_height="wrap_content"         /></RelativeLayout></span>

JAVA files

<Span style = "font-size: 18px;"> package com. example. gallery; import android. OS. bundle; import android. r. integer; import android. app. activity; import android. view. menu; import android. view. view; import android. view. viewGroup; import android. widget. baseAdapter; import android. widget. gallery; import android. widget. gallery. layoutParams; import android. widget. imageView; public class MainActivity extends Activity {private Gallery gallery; // declare Galleryprivate int images [] = {R. drawable. a1, R. drawable. a2, R. drawable. a3, R. drawable. a4, R. drawable. a5, R. drawable. a6, R. drawable. a7, R. drawable. a8, R. drawable. a9, R. drawable. a10, R. drawable. a11, R. drawable. a12, R. drawable. a13, R. drawable. a14}; // image data @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); gallery = (Gallery) this. findViewById (R. id. gallery); // obtain Gallerygallery. setAdapter (new MyAdapter ();} // The new Class inherits BaseAdapterclass MyAdapter extends BaseAdapter {@ Overridepublic int getCount () {// TODO Auto-generated method stub // The maximum return Integer of the Integer data volume. MAX_VALUE ;}@ Overridepublic Object getItem (int position) {// TODO Auto-generated method stubreturn position ;}@ Overridepublic long getItemId (int position) {// TODO Auto-generated method stubreturn position;} @ Overridepublic View getView (int position, View myview, ViewGroup parent) {// TODO Auto-generated method stub // create the View object ImageView image = new ImageView (getApplicationContext (); // set the image data. setImageResource (images [position % images. length]); // sets the image alignment mode. setScaleType (ImageView. scaleType. FIT_XY); // set the image size. setLayoutParams (new Gallery. layoutParams (LayoutParams. WRAP_CONTENT, LayoutParams. WRAP_CONTENT); // return ImageView return image ;}}</span>

Results:

Gallery loads data through the Adapter and then displays the Gallery in the Ui.

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