Android 积分签到上移消失动画效果实现

在 Android 开发中，积分签到常需配合动画提升交互体验。点击签到按钮后，显示 +30 积分文字并向上移动逐渐消失。

大致思路： 动画部分由垂直平移和透明度变化两个动画组成。通过 AnimationSet 将两个动画添加到集合，然后开始播放。UI 更新使用 Handler 发送消息处理。

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.AnimationSet;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private ImageView mSignIn;
    private ImageView redDot;
    private TextView signSuccess;
    private AnimationSet set;
    private String isSign;
    private TextView textView;
    private Handler mHandler = new Handler() {
        private int i = 100;
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
                 : 
                    i = i + ;
                    mSignIn.setImageResource(R.drawable.icon_signed); 
                    redDot.setVisibility(View.GONE); 
                    
                    signSuccess.startAnimation(set);
                    signSuccess.setVisibility(View.GONE);
                    textView.setText( + i);
                    ;
                :
                    ;
            }
        }
    };

    
       {
        .onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSignIn = (ImageView) findViewById(R.id.iv_sign); 
        redDot = (ImageView) findViewById(R.id.iv_redpoint); 
        textView = (TextView) findViewById(R.id.tv_score); 
        
        signSuccess = (TextView) findViewById(R.id.iv_sign_success);
        
           signSuccess.getLeft();
           signSuccess.getTop();
        
        
            (left, left, top, top - );
        translate.setDuration();
        
            (, );
        alpha.setDuration();
        alpha.setFillAfter();
        
        set =  ();
        set.addAnimation(translate);
        set.addAnimation(alpha);
    }

    
       {
        signSuccess.setVisibility(View.VISIBLE);
            ();
        message.what = ;
        mHandler.sendMessage(message);
    }
}