Android CountDownTimer实现定时器和倒计时效果

public class SplashActivity extends BaseAppCompatActivity { 
 
  @InjectView(R.id.ivBg) 
  ImageView ivBg; 
  @InjectView(R.id.tvSkip) 
  TextView tvSkip; 
 
  int[] imgs = new int[]{ 
      R.mipmap.irving, 
      R.mipmap.bryant, 
      R.mipmap.james, 
      R.mipmap.harden, 
      R.mipmap.curry}; 
 
  private CountDownTimer timer; 
 
  @Override 
  protected int getContentViewLayoutID() { 
    return R.layout.activity_splash; 
  } 
 
  @Override 
  protected void initViewsAndEvents() { 
    int index = (int) (Math.random() * imgs.length); 
 
    ivBg.setImageResource(imgs[index]); 
 
    timer = new CountDownTimer(3500, 1000) { 
      @Override 
      public void onTick(long millisUntilFinished) { 
        tvSkip.setText(String.format(getResources().getString(R.string.skip), (int) (millisUntilFinished / 1000 + 0.1))); 
      } 
 
      @Override 
      public void onFinish() { 
        tvSkip.setText(String.format(getResources().getString(R.string.skip), 0)); 
        startActivity(new Intent(mContext, HomeActivity.class)); 
        finish(); 
      } 
    }; 
    timer.start(); 
  } 
 
  @OnClick(R.id.tvSkip) 
  public void skip() { 
    if (timer != null) 
      timer.cancel(); 
 
    startActivity(new Intent(mContext, HomeActivity.class)); 
    finish(); 
  } 
 
  @Override 
  protected void onDestroy() { 
    super.onDestroy(); 
 
    if (timer != null) { 
      timer.cancel(); 
    } 
  } 
} 

<?xml version="1.0" encoding="utf-8"?  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent"  
 
  <ImageView 
    android:id="@+id/ivBg" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:scaleType="fitXY" /  
 
  <TextView 
    android:id="@+id/tvSkip" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentTop="true" 
    android:layout_margin="10dp" 
    android:background="@drawable/common_button_selector" 
    android:padding="5dp" 
    android:text="@string/skip" /  
 
</RelativeLayout