สร้าง project MyApp3 สร้างจรวด กดปุ่ม แว็ป หายไป แล้วก็กลับมา และขยายใหญ่ขึ้น
MainActivity.java
package com.example.myapp3;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btAlpha=(Button)findViewById(R.id.button1);
btAlpha.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onClick(View v) {
switch(v.getId())
{
case R.id.button1:
Animation a=AnimationUtils.loadAnimation(this,R.anim.rocket_alpha);
final ImageView iv=(ImageView)findViewById(R.id.imageView1);
a.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation arg0) {
iv.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationEnd(Animation animation) {
// TODO Auto-generated method stub
}
});
iv.startAnimation(a);
break;
}
}
}
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Rocket_alpha.xml
<?xml version="1.0" encoding="UTF-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha android:fromAlpha="0" android:toAlpha="1" android:duration="2000"/>
<scale android:fromXScale="1" android:toXScale="3.5" (ขยายใหญ่ขึ้นตามแนวแกน X)
android:fromYScale="1" android:toYScale="3.5" (ขยายใหญ่ขึ้นตามแนวแกน Y)
android:duration="3000" (ภายในช่วงเวลา 3000)
android:pivotX="50%" android:pivotY="100%"
android:startOffset="2000"/>
</set>
-------------------------------
activity_main.xml
<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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="17dp"
android:text="Alpha" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="150dp"
android:layout_height="120dp"
android:layout_above="@+id/button1"
android:layout_toRightOf="@+id/textView1"
android:visibility="gone"
android:src="@drawable/rocket" />
</RelativeLayout>
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