Android

Android Customized ImageButton Example
Author : Ishtek

Using Android API Level : 7 
In this example we shall see a very simple ways to work with ImageButton API from
Android platform and I have used ImageButton API from Android Platform.

Main Activity Screen
Layout and widgets used in these activities are provided by coding only. Code for these activities are as shown below: main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/linearLayout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageButton android:id="@+id/imgButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/test"/> </LinearLayout>
CanvasExampleProject.java
/** * This code is provided on "AS IS" basis without guarantee/warranty * of any kind. Use of this code subjected to user's own risk. * @Author: Ishtek */ package com.techienjoy.example; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.ImageButton; import android.widget.LinearLayout; public class CanvasExampleProject extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linearLayout); CustomImageButton customImageButton = new CustomImageButton(this); customImageButton.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); customImageButton.setAdjustViewBounds(true); customImageButton.setImageResource(R.drawable.test); customImageButton.setFadingEdgeLength(5); linearLayout.addView(customImageButton); linearLayout.invalidate(); } class CustomImageButton extends ImageButton { public CustomImageButton(Context context) { super(context); } @Override public void onDraw(Canvas canvas) { Paint paint = new Paint(); paint.setColor(Color.RED); canvas.drawBitmap(((BitmapDrawable)getDrawable()).getBitmap(), 8, 5, paint); canvas.drawRect(10,20,30,40,paint); } } }
In this example there are two ImageButton shown one below the other, first one is defined in the main.xml file as ImageButton tag descriptor, and then the other ImageButton is being customized to add a Red colored square on top of it. This is done by overriding the onDraw method from ImageButton, and writing some code to add the desired flavor to this original Image. Hope this helps.
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Name: UsingFrameworksDated: 2013-10-19 15:44:17
This is a very helpful article..  thanks a ton     
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Name: SureshDated: 2013-10-26 20:40:47
Is there any ways to show some animation in GIF format, on an ImageView from Android Platform.

When an image in GIF format is to be shown on screen,
then what would be a better approach for showing this GIF image on screen, whether should I use
ImageView or Canvas or any other ways of showing an
animated Image flow in a GIF format.    
Name: IshtekDated: 2013-12-30 22:25:49
Is there any ways to implement a custom view using composition rather that inheritance approach?

Thanks.
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