xalexchen’s gists

xalexchen / BitmapAllocation.java

Created September 28, 2013 02:09

This example shows how to speed up bitmap loading and reduce garbage collection by reusing existing bitmaps.

	import android.app.Activity;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.os.Bundle;
	import android.view.View;
	import android.widget.CheckBox;
	import android.widget.ImageView;
	import android.widget.TextView;

	/**

xalexchen / new_gist_file

Created September 22, 2013 08:59

python Chinese character

.decode('unicode_escape').encode('iso8859-1').decode('utf8')

xalexchen / KeyframeAnimation.java

Created September 17, 2013 05:44

This example shows how to use AnimationDrawable to construct a keyframe animation where each frame is shown for a specified duration.

	import android.app.Activity;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.Color;
	import android.graphics.Paint;
	import android.graphics.drawable.AnimationDrawable;
	import android.graphics.drawable.BitmapDrawable;
	import android.os.Bundle;
	import android.view.View;
	import android.widget.ImageView;

xalexchen / LayoutTransChanging.java

Created September 17, 2013 03:44

This example shows how to use LayoutTransition to animate simple changes in a layout

	import android.animation.LayoutTransition;
	import android.app.Activity;
	import android.content.Context;
	import android.os.Bundle;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.Button;
	import android.widget.LinearLayout;
	import android.widget.LinearLayout.LayoutParams;

xalexchen / MultiPropertyAnimations.java

Last active December 23, 2015 05:49

This example shows various ways of animating android view multiple properties in parallel

	import android.animation.ObjectAnimator;
	import android.animation.PropertyValuesHolder;
	import android.animation.ValueAnimator;
	import android.animation.ValueAnimator.AnimatorUpdateListener;
	import android.app.Activity;
	import android.os.Bundle;
	import android.view.View;

	/**
	* This example shows various ways of animating multiple properties in parallel.

xalexchen / ShadowLayout.java

Last active June 14, 2021 23:30

Android custom layout paints a drop shadow behind all children

	import android.content.Context;
	import android.graphics.Bitmap;
	import android.graphics.BlurMaskFilter;
	import android.graphics.BlurMaskFilter.Blur;
	import android.graphics.Canvas;
	import android.graphics.Color;
	import android.graphics.Paint;
	import android.graphics.Paint.Style;
	import android.graphics.Rect;
	import android.graphics.RectF;

xalexchen / VPADemo.java

Last active December 23, 2015 05:39

Android ViewPropertyAnimatior demo

	public class VPADemo extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);

	final LinearLayout container = (LinearLayout) findViewById(R.id.container);

	final Button fadeOut = (Button) findViewById(R.id.fadeOut);
	final Button fadeIn = (Button) findViewById(R.id.fadeIn);

xalexchen / PictureViewer.java

Last active December 23, 2015 04:29

imageview cross-fade effect by using ViewPropertyAnimator

	/**
	* This example shows how to use ViewPropertyAnimator to get a cross-fade effect as new
	* bitmaps get installed in an ImageView.
	*
	* Watch the associated video for this demo on the DevBytes channel of developer.android.com
	* or on YouTube at https://www.youtube.com/watch?v=9XbKMUtVnJA.
	*/
	public class PictureViewer extends Activity {

	int mCurrentDrawable = 0;

xalexchen / build.gradle

Last active December 22, 2015 21:29

rename final apk accoring to build time

xalexchen / build.gradle

Created September 12, 2013 06:46

copy android so library into apk on android stuido

	task nativeLibsToJar(
	type: Zip,
	description: 'create a jar archive of the native libs') {
	destinationDir file("$buildDir/native-libs")
	baseName 'native-libs'
	extension 'jar'
	from fileTree(dir: 'libs', include: '*/.so')
	into 'lib/'
	}

Alex.Chen xalexchen