Tutorial

The following assumes that you have already basic knowledge in Android development. Please check the Android development tutorial to learn the basics.

We will create an example to demonstrate the usage of the Properties Animation API.

Create a new Android project "de.vogella.android.animation" with the Activity called "AnimationExampleActivity". Change "main.xml" to the following.

			
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/Button01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="startAnimation"
            android:text="Rotate" />

        <Button
            android:id="@+id/Button04"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="startAnimation"
            android:text="Group" >
        </Button>

        <Button
            android:id="@+id/Button03"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="startAnimation"
            android:text="Fade" />

        <Button
            android:id="@+id/Button02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="startAnimation"
            android:text="Animate" />

    </LinearLayout>

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:src="@drawable/icon" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/imageView1"
        android:layout_alignRight="@+id/imageView1"
        android:layout_marginBottom="30dp"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>
		

Create the following menu resource.

			
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/item1"
        android:showAsAction="ifRoom"
        android:title="Game">
    </item>

</menu>
		

Change your Activity to the following.

			
package de.vogella.android.animation;

import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

public class AnimationExampleActivity extends Activity {

	
/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

	}

	public void startAnimation(View view) {
		float dest = 0;
		ImageView aniView = (ImageView) findViewById(R.id.imageView1);
		switch (view.getId()) {

		case R.id.Button01:
			dest = 360;
			if (aniView.getRotation() == 360) {
				System.out.println(aniView.getAlpha());
				dest = 0;
			}
			ObjectAnimator animation1 = ObjectAnimator.ofFloat(aniView,
					"rotation", dest);
			animation1.setDuration(2000);
			animation1.start();
			// Show how to load an animation from XML
			// Animation animation1 = AnimationUtils.loadAnimation(this,
			// R.anim.myanimation);
			// animation1.setAnimationListener(this);
			// animatedView1.startAnimation(animation1);
			break;

		case R.id.Button02:
			// Shows how to define a animation via code
			// Also use an Interpolator (BounceInterpolator)
			Paint paint = new Paint();
			TextView aniTextView = (TextView) findViewById(R.id.textView1);
			float measureTextCenter = paint.measureText(aniTextView.getText()
					.toString());
			dest = 0 - measureTextCenter;
			if (aniTextView.getX() < 0) {
				dest = 0;
			}
			ObjectAnimator animation2 = ObjectAnimator.ofFloat(aniTextView,
					"x", dest);
			animation2.setDuration(2000);
			animation2.start();
			break;

		case R.id.Button03:
			// Demonstrate fading and adding an AnimationListener

			dest = 1;
			if (aniView.getAlpha() > 0) {
				dest = 0;
			}
			ObjectAnimator animation3 = ObjectAnimator.ofFloat(aniView,
					"alpha", dest);
			animation3.setDuration(2000);
			animation3.start();
			break;

		case R.id.Button04:

			ObjectAnimator fadeOut = ObjectAnimator.ofFloat(aniView, "alpha",
					0f);
			fadeOut.setDuration(2000);
			ObjectAnimator mover = ObjectAnimator.ofFloat(aniView,
					"translationX", -500f, 0f);
			mover.setDuration(2000);
			ObjectAnimator fadeIn = ObjectAnimator.ofFloat(aniView, "alpha",
					0f, 1f);
			fadeIn.setDuration(2000);
			AnimatorSet animatorSet = new AnimatorSet();

			animatorSet.play(mover).with(fadeIn).after(fadeOut);
			animatorSet.start();
			break;

		default:
			break;
		}

	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.mymenu, menu);
		return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		Intent intent = new Intent(this, HitActivity.class);
		startActivity(intent);
		return true;
	}
}
		

Create a new Activity called "HitActivity".

			
package de.vogella.android.animation;

import java.util.Random;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class HitActivity extends Activity {
	private ObjectAnimator animation1;
	private ObjectAnimator animation2;
	private Button button;
	private Random randon;
	private int width;
	private int height;
	private AnimatorSet set;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.target);
		width = getWindowManager().getDefaultDisplay().getWidth();
		height = getWindowManager().getDefaultDisplay().getHeight();
		randon = new Random();

		set = createAnimation();
		set.start();
		set.addListener(new AnimatorListenerAdapter() {

			@Override
			public void onAnimationEnd(Animator animation) {
				int nextX = randon.nextInt(width);
				int nextY = randon.nextInt(height);
				animation1 = ObjectAnimator.ofFloat(button, "x", button.getX(),
						nextX);
				animation1.setDuration(1400);
				animation2 = ObjectAnimator.ofFloat(button, "y", button.getY(),
						nextY);
				animation2.setDuration(1400);
				set.playTogether(animation1, animation2);
				set.start();
			}
		});
	}

	public void onClick(View view) {
		String string = button.getText().toString();
		int hitTarget = Integer.valueOf(string) + 1;
		button.setText(String.valueOf(hitTarget));
	}

	private AnimatorSet createAnimation() {
		int nextX = randon.nextInt(width);
		int nextY = randon.nextInt(height);
		button = (Button) findViewById(R.id.button1);
		animation1 = ObjectAnimator.ofFloat(button, "x", nextX);
		animation1.setDuration(1400);
		animation2 = ObjectAnimator.ofFloat(button, "y", nextY);
		animation2.setDuration(1400);
		AnimatorSet set = new AnimatorSet();
		set.playTogether(animation1, animation2);
		return set;
	}
}

		

If you run this example and press the different Buttons, the animation should start. Via the ActionBar you can navigate to your other Activity.

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