Demos: A Java repository from MoveToNext

#零碎知识笔记

##属性动画

###ObjectAnimator 动画的执行类

  animation.ofFloat(view, "alpha", 1.0F, 0.5F,1.0F)
  透明度从1变到0再变到1
  ObjectAnimator//
          .ofFloat(view, "rotationX", 0.0F, 360.0F)//
          .setDuration(500)//
          .start();
  旋转X轴

###ValueAnimator 实现动画

ValueAnimator是ObjectAnimator的基类

  valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
          image.setTranslationY((float)animation.getAnimatedValue());
      }
  });
  valueAnimator.addListener(new AnimatorListenerAdapter() {
      @Override
      public void onAnimationEnd(Animator animation) {
          super.onAnimationEnd(animation);
          ViewGroup parent = (ViewGroup) image.getParent();
          parent.removeView(image);
      }
  });

###TimeInterpolator（时间插值器）：一般用自带的就可以了

根据时间流逝的百分比计算出当前属性值改变的百分比。

###TypeEvaluator（类型估值算法，即估值器）：

根据当前属性改变的百分比来计算改变后的属性值

  public class MyTypeEvaluator implements TypeEvaluator<Paint> {
      @Override
      public Paint evaluate(float fraction, Paint startValue, Paint endValue) {
          Log.e("fraction", fraction + "");
          Paint paint = new Paint();
          paint.x = 100*fraction * 3f;
          paint.y = 100 * (fraction * 3f) * (fraction * 3f);
          return paint;
      }
  }

##Butter Knife

在使用高版本的Butter Knife会出现空指针异常，需要在gradle里面配置 classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8' 并在项目gradle里面添加 apt 'com.jakewharton:butterknife-compiler:8.2.1' 具体代码如下：

Configure your project-level build.gradle to include the 'android-apt' plugin:

buildscript {
  repositories {
    mavenCentral()
   }
  dependencies {
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
  }
}
Then, apply the 'android-apt' plugin in your module-level build.gradle and add the Butter Knife dependencies:

apply plugin: 'android-apt'

android {
  ...
}

dependencies {
  compile 'com.jakewharton:butterknife:8.2.1'
  apt 'com.jakewharton:butterknife-compiler:8.2.1'
}

##onWindowFocusChanged

 @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
    }

当一个Activity完全加载完毕后，然后就执行

rxjava retrofit 依赖冲突

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'io.reactivex.rxjava2:rxjava:2.0.0'
compile 'io.reactivex.rxjava2:rxandroid:2.0.0'
compile 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'

将com.jakewharton.retrofit:retrofit2-rxjava2-adapter替换com.squareup.retrofit2:adapter-rxjava即可

MoveToNext/Demos

rxjava retrofit 依赖冲突