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微信曾經推出了一個查找附近好友的功能,大致功能是這樣的:屏幕上有一個按鈕,長按按鈕的時候,會有一圈圈水波紋的動畫向外擴散,松手后,動畫結束。
現在簡單來實現這樣的一個動畫功能:
思路: 主要用到了下面的藍色的圖片,定義三個ImageView,background都設置為藍色的圖片,然后定義一個包括縮放和透明度變化的動畫集,然后每隔一段時間,讓3個ImageView依次啟動這個動畫集,看起來就像藍色的圓圈像水波紋向外擴散一樣。
相關實現邏輯如下:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <ImageView android:id="@+id/wave1" android:layout_width="150dp" android:layout_height="150dp" android:layout_centerInParent="true" android:background="@drawable/wave" /> <ImageView android:id="@+id/wave2" android:layout_width="150dp" android:layout_height="150dp" android:layout_centerInParent="true" android:background="@drawable/wave"/> <ImageView android:id="@+id/wave3" android:layout_width="150dp" android:layout_height="150dp" android:layout_centerInParent="true" android:background="@drawable/wave" /> <ImageView android:id="@+id/normal" android:layout_width="166dp" android:layout_height="166dp" android:layout_centerInParent="true" android:background="@drawable/normal" /> </RelativeLayout>
MainActivity.java
package com.jackie.waveanimation; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.MotionEvent; import android.view.View; import android.view.animation.AlphaAnimation; import android.view.animation.AnimationSet; import android.view.animation.ScaleAnimation; import android.widget.ImageView; public class MainActivity extends Activity { private ImageView mNormal, mWave1, mWave2, mWave3; private AnimationSet mAnimationSet1, mAnimationSet2, mAnimationSet3; private static final int OFFSET = 600; //每個動畫的播放時間間隔 private static final int MSG_WAVE2_ANIMATION = 2; private static final int MSG_WAVE3_ANIMATION = 3; private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_WAVE2_ANIMATION: mWave2.startAnimation(mAnimationSet2); break; case MSG_WAVE3_ANIMATION: mWave3.startAnimation(mAnimationSet3); break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mNormal = (ImageView) findViewById(R.id.normal); mWave1 = (ImageView) findViewById(R.id.wave1); mWave2 = (ImageView) findViewById(R.id.wave2); mWave3 = (ImageView) findViewById(R.id.wave3); mAnimationSet1 = initAnimationSet(); mAnimationSet2 = initAnimationSet(); mAnimationSet3 = initAnimationSet(); mNormal.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: showWaveAnimation(); break; case MotionEvent.ACTION_UP: clearWaveAnimation(); break; case MotionEvent.ACTION_CANCEL: clearWaveAnimation(); } return true; } }); } private AnimationSet initAnimationSet() { AnimationSet as = new AnimationSet(true); ScaleAnimation sa = new ScaleAnimation(1f, 2.3f, 1f, 2.3f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f); sa.setDuration(OFFSET * 3); sa.setRepeatCount(Animation.INFINITE);// 設置循環 AlphaAnimation aa = new AlphaAnimation(1, 0.1f); aa.setDuration(OFFSET * 3); aa.setRepeatCount(Animation.INFINITE);//設置循環 as.addAnimation(sa); as.addAnimation(aa); return as; } private void showWaveAnimation() { mWave1.startAnimation(mAnimationSet1); mHandler.sendEmptyMessageDelayed(MSG_WAVE2_ANIMATION, OFFSET); mHandler.sendEmptyMessageDelayed(MSG_WAVE3_ANIMATION, OFFSET * 2); } private void clearWaveAnimation() { mWave1.clearAnimation(); mWave2.clearAnimation(); mWave3.clearAnimation(); } }
效果如下:
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