tweenactivity.java

Android从入门到精通

package com.androidbook.ShapeShifter;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class TweenActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.tween);
		
	     // Handle Fade Button
		final Button fadeButton = (Button) findViewById(R.id.ButtonAlpha);
		fadeButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				performAnimation(R.anim.transparency);
			}
		});
			
		// Handle Grow Button
		final Button growButton = (Button) findViewById(R.id.ButtonScale);
		growButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				performAnimation(R.anim.grow);
			}
		});
		
	     // Handle Move Button
		final Button moveButton = (Button) findViewById(R.id.ButtonTranslate);
		moveButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				performAnimation(R.anim.translate_position);
			}
		});
			
		// Handle Spin Button
		final Button spinButton = (Button) findViewById(R.id.ButtonRotate);
		spinButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				performAnimation(R.anim.spin);
			}
		});
		
		// Handle All Button
		final Button allButton = (Button) findViewById(R.id.ButtonAll);
		allButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				performAnimation(R.anim.shakennotstirred);
			}
		});
	
	}
		
	private void performAnimation(int animationResourceID)
	{
		// We will animate the imageview
		ImageView reusableImageView = (ImageView)findViewById(R.id.ImageViewForTweening);
		reusableImageView.setImageResource(R.drawable.green_rect);
		reusableImageView.setVisibility(View.VISIBLE);
		
		// Load the appropriate animation
        Animation an =  AnimationUtils.loadAnimation(this, animationResourceID);
        // Register a listener, so we can disable and re-enable buttons
        an.setAnimationListener(new MyAnimationListener());	
        // Start the animation
        reusableImageView.startAnimation(an);	
	}
	



	private void toggleButtons(boolean clickableState)
	{
		
		final Button fadeButton = (Button) findViewById(R.id.ButtonAlpha);
		fadeButton.setClickable(clickableState);
			
		// Handle Grow Button
		final Button growButton = (Button) findViewById(R.id.ButtonScale);
		growButton.setClickable(clickableState);
		
	     // Handle Move Button
		final Button moveButton = (Button) findViewById(R.id.ButtonTranslate);
		moveButton.setClickable(clickableState);
		
		// Handle Spin Button
		final Button spinButton = (Button) findViewById(R.id.ButtonRotate);
		spinButton.setClickable(clickableState);
		
		// Handle Spin Button
		final Button allButton = (Button) findViewById(R.id.ButtonAll);
		allButton.setClickable(clickableState);
		
	}

	class MyAnimationListener implements Animation.AnimationListener {

		public void onAnimationEnd(Animation animation) {
			// Hide our ImageView
			ImageView reusableImageView = (ImageView)findViewById(R.id.ImageViewForTweening);
			reusableImageView.setVisibility(View.INVISIBLE);
			
			// Enable all buttons once animation is over
			toggleButtons(true);
			
		}

		public void onAnimationRepeat(Animation animation) {
			// what to do when animation loops 
		}

		public void onAnimationStart(Animation animation) {
			// Disable all buttons while animation is running
			toggleButtons(false);
			
		}
		
	}

}