ANDROID 仿path按钮效果（无旋转）

package com.alanz.path; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.animation.Animation; import android.view.animation.AnimationSet; import android.view.animation.RotateAnimation; import android.view.animation.TranslateAnimation; import android.view.animation.Animation.AnimationListener; import android.widget.Button; public class Main extends Activity implements OnClickListener{ private final static int RADIUS = 200; private final static long ANIMATION_TIME = 300; private final static long TIME_INTERVAL = 30; private Button mMain; private Button mB1; private Button mB2; private Button mB3; private Button mB4; private List<AnimationSet> mOutAnimatinSets = new ArrayList<AnimationSet>(); private List<AnimationSet> mInAnimatinSets = new ArrayList<AnimationSet>(); private List<Button> mList = new ArrayList<Button> (); private boolean isIn = true; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initViews(); initAnimation(); } private void initViews() { mMain = (Button) findViewById(R.id.main); mB1 = (Button) findViewById(R.id.b1); mB2 = (Button) findViewById(R.id.b2); mB3 = (Button) findViewById(R.id.b3); mB4 = (Button) findViewById(R.id.b4); mList.add(mB1); mList.add(mB2); mList.add(mB3); mList.add(mB4); mMain.setOnClickListener(this); } private void initAnimation() { RotateAnimation outRotaAni = new RotateAnimation(0, 720, 0, 0); outRotaAni.setDuration(ANIMATION_TIME); RotateAnimation inRotaAni = new RotateAnimation(720, 0, 0, 0); inRotaAni.setDuration(ANIMATION_TIME); int size = mList.size(); for (int i = 0; i < size; i ++) { final Button button = mList.get(i); int x; int y; double angle; if (i == 0) { x = 0; y = RADIUS; angle = 0; } else if (i == mList.size() - 1) { x = RADIUS; y = 0; angle = 90; } else { angle = (90 / (size - 1)) * i; x = (int) (RADIUS * Math.sin(Math.toRadians(angle))); y = (int) (RADIUS * Math.cos(Math.toRadians(angle))); } long time = ANIMATION_TIME - i * TIME_INTERVAL; // System.out.println("==============================="); // System.out.println("====>" + x); // System.out.println("====>" + y); // System.out.println("====>" + angle); // TranslateAnimation outTranAni = new TranslateAnimation(0, x ,0 , -y); outTranAni.setDuration(time); AnimationSet outSet = new AnimationSet(true); outSet.addAnimation(outTranAni); // outSet.addAnimation(outRotaAni); outSet.setFillAfter(true); mOutAnimatinSets.add(outSet); // final AnimationSet outAfterSet = new AnimationSet(true); TranslateAnimation outAfterTranAni = new TranslateAnimation(x, x * 8 / 9 ,-y , -y * 8 / 9); outAfterTranAni.setDuration(time); outAfterSet.addAnimation(outAfterTranAni); outAfterSet.setFillAfter(true); outSet.setAnimationListener(new AnimationListener() { @Override public void onAnimationEnd(Animation animation) { button.startAnimation(outAfterSet); } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationStart(Animation animation) { } }); // TranslateAnimation inTranAni = new TranslateAnimation(x * 8 / 9, 0 , -y * 8 / 9 , 0); inTranAni.setDuration(time); AnimationSet inSet = new AnimationSet(true); inSet.addAnimation(inTranAni); // inSet.addAnimation(inRotaAni); inSet.setFillAfter(true); mInAnimatinSets.add(inSet); } } @Override public void onClick(View v) { if (isIn) { startOutAnimation(); isIn = false; } else { startInAnimation(); isIn = true; } } private void startInAnimation() { for (int i = 0; i < mList.size(); i ++) { Button button = mList.get(i); button.startAnimation(mInAnimatinSets.get(i)); } } private void startOutAnimation() { for (int i = 0; i < mList.size(); i ++) { Button button = mList.get(i); button.startAnimation(mOutAnimatinSets.get(i)); } } }