Android属性动画实现炫酷的登录界面

我们聊聊我们常写的登录界面，这个界面我相信很多人都写过，而且也没什么难度，但是如果要实现比较不一般的效果，那就要花点心思了，先看看项目的效果吧：

我一直都不知道怎么在编辑框连设置图片大小，所以这个图不怎么样适配编辑框了，大家先凑合着看看。

我先讲讲思路，当我们输入完账号跟密码之后，点击登录，那这个输入框就慢慢的消失，在消失后，紧接着就出现这个进度的界面。

思路有了，那我们就开始编码了：
新建一个项目，然后系统生成了一个MainActivity.java文件和activity_main.xml文件。先在activity_main里面操作：
代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#7adfb8"
  tools:context=".MainActivity" >
  <include
    android:id="@+id/main_title"
    layout="@layout/title_layout" />
  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/main_title"
    android:orientation="vertical" >
    <ImageView
      android:layout_width="55dip"
      android:layout_height="55dip"
      android:layout_gravity="center_horizontal"
      android:src="@drawable/project_detail_cir" />
    <TextView
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_marginTop="5dip"
      android:gravity="center"
      android:text="FIREFLY FOREST"
      android:textColor="#ffffff"
      android:textSize="24sp" />
    <TextView
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:gravity="center"
      android:text="SHOW YOUR IDEAS"
      android:textColor="#ffffff"
      android:textSize="16sp" />
  </LinearLayout>
  <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true" >
    <include
      android:id="@+id/input_layout"
      android:layout_width="match_parent"
      android:layout_height="130dip"
      layout="@layout/input_layout" />
    <include
      android:id="@+id/layout_progress"
      android:layout_width="match_parent"
      android:layout_height="130dip"
      layout="@layout/layout_progress"
      android:visibility="gone" />
    <TextView
      android:id="@+id/main_btn_login"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/input_layout"
      android:layout_centerInParent="true"
      android:layout_marginTop="15dip"
      android:background="@drawable/text_bg"
      android:gravity="center"
      android:paddingBottom="2dip"
      android:paddingLeft="15dip"
      android:paddingRight="15dip"
      android:paddingTop="2dip"
      android:text="Login"
      android:textColor="#ffffff"
      android:textSize="20sp" />
  </RelativeLayout>
</RelativeLayout>

这里我引用外面的三个布局，再加上一个TextView写的按钮，标题所引用的文件:
title_layout.xml

<?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="50dip"
  android:gravity="center_vertical"
  android:padding="10dip" >
  <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/back" />
  <TextView 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#ffffff"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:textSize="20sp"
    android:text="Sign up"
    />
</RelativeLayout>

输入框引用的文件：input_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical" >
  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="20dip"
    android:background="@drawable/radius_drawable_bg"
    android:orientation="vertical"
    android:padding="10dip" >
    <LinearLayout
      android:id="@+id/input_layout_name"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="center_vertical"
      android:orientation="horizontal" >
      <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/paw_code" />
      <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:background="#00000000"
        android:hint="账号/用户名/邮箱"
        android:padding="5dip"
        android:textSize="16sp" />
    </LinearLayout>
    <View
      android:layout_width="match_parent"
      android:layout_height="1px"
      android:layout_marginBottom="5dip"
      android:layout_marginTop="5dip"
      android:background="#eeeeee" />
    <LinearLayout
      android:id="@+id/input_layout_psw"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="center_vertical"
      android:orientation="horizontal" >
      <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/paw_left" />
      <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:background="#00000000"
        android:hint="密码"
        android:inputType="textPassword"
        android:padding="5dip"
        android:textSize="16sp" />
    </LinearLayout>
  </LinearLayout>
</LinearLayout>

还有一个加载进度的界面：layout_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical" >
  <LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="20dip"
    android:background="@drawable/rotate_layout_bg"
    android:orientation="vertical"
    android:padding="10dip" >
    <ProgressBar
      android:id="@+id/progressBar2"
      android:layout_width="wrap_content"
       android:layout_margin="10dip"
      android:layout_height="wrap_content" />
  </LinearLayout>
</LinearLayout>

当然，我这里还用到了drawable文件：radius_drawable_bg.xml，这个文件是输入框的圆角矩形背景：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
  <corners android:radius="5dip"/>
  <solid android:color="#ffffff"/>
</shape>

还有进度的白色圆形背景：rotate_layout_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="oval" >
  <corners android:radius="60dip" />
  <solid android:color="#ffffff" />
</shape>

除此之外，还有一个按钮的描边背景text_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  >
  <corners android:radius="50dip"/>
  <stroke
    android:width="1dip"
    android:color="#ffffff" />
</shape>

至此，我们的前期界面的编写就完成了，不难，很容易理解，下面开始处理MainActivity.java文件，先看看这里的初始化操作;

  private TextView mBtnLogin;
  private View progress;
  private View mInputLayout;
  private float mWidth, mHeight;
  private LinearLayout mName, mPsw;
  private void initView() {
    mBtnLogin = (TextView) findViewById(R.id.main_btn_login);
    progress = findViewById(R.id.layout_progress);
    mInputLayout = findViewById(R.id.input_layout);
    mName = (LinearLayout) findViewById(R.id.input_layout_name);
    mPsw = (LinearLayout) findViewById(R.id.input_layout_psw);
    mBtnLogin.setOnClickListener(this);
  }

这里主要就是加载控件了，不需要多解释，重点看看动画的处理：

  private void inputAnimator(final View view, float w, float h) {
    AnimatorSet set = new AnimatorSet();
    ValueAnimator animator = ValueAnimator.ofFloat(0, w);
    animator.addUpdateListener(new AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        float value = (Float) animation.getAnimatedValue();
        ViewGroup.MarginLayoutParams params = (MarginLayoutParams) view
            .getLayoutParams();
        params.leftMargin = (int) value;
        params.rightMargin = (int) value;
        view.setLayoutParams(params);
      }
    });
    ObjectAnimator animator2 = ObjectAnimator.ofFloat(mInputLayout,
        "scaleX", 1f, 0.5f);
    set.setDuration(1000);
    set.setInterpolator(new AccelerateDecelerateInterpolator());
    set.playTogether(animator, animator2);
    set.start();
    set.addListener(new AnimatorListener() {
      @Override
      public void onAnimationStart(Animator animation) {
      }
      @Override
      public void onAnimationRepeat(Animator animation) {
      }
      @Override
      public void onAnimationEnd(Animator animation) {
        
        progress.setVisibility(View.VISIBLE);
        progressAnimator(progress);
        mInputLayout.setVisibility(View.INVISIBLE);
      }
      @Override
      public void onAnimationCancel(Animator animation) {
      }
    });
  }

这里用到的知识点还是挺多，例如：属性动画容器、插值器、属性动画的监听、动态的设置控件的相对位置;一开始可能不容易理解，没关系，以后我会在博客里都讲到。我就说一下这里的思路;
当我们开启这个动画的时候，先是设置相对位置，同时处理在X轴的缩放，然后我们监听到的生命周期，并且在动画结束的时候，隐藏当前布局，开启另外一个布局的显示动画，看到另外一个动画：

  private void progressAnimator(final View view) {
    PropertyValuesHolder animator = PropertyValuesHolder.ofFloat("scaleX",
        0.5f, 1f);
    PropertyValuesHolder animator2 = PropertyValuesHolder.ofFloat("scaleY",
        0.5f, 1f);
    ObjectAnimator animator3 = ObjectAnimator.ofPropertyValuesHolder(view,
        animator, animator2);
    animator3.setDuration(1000);
    animator3.setInterpolator(new JellyInterpolator());
    animator3.start();
  }

其实这里的套路是一样的但是不同的是，这里我用到了自己的插值器;
JellyInterpolator.java:

public class JellyInterpolator extends LinearInterpolator {
  private float factor;
  public JellyInterpolator() {
    this.factor = 0.15f;
  }
  @Override
  public float getInterpolation(float input) {
    return (float) (Math.pow(2, -10 * input)
        * Math.sin((input - factor / 4) * (2 * Math.PI) / factor) + 1);
  }
}

让动画更有动感。下面我贴上MainActivity的全部代码;

public class MainActivity extends Activity implements OnClickListener {
  private TextView mBtnLogin;
  private View progress;
  private View mInputLayout;
  private float mWidth, mHeight;
  private LinearLayout mName, mPsw;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
    initView();
  }
  private void initView() {
    mBtnLogin = (TextView) findViewById(R.id.main_btn_login);
    progress = findViewById(R.id.layout_progress);
    mInputLayout = findViewById(R.id.input_layout);
    mName = (LinearLayout) findViewById(R.id.input_layout_name);
    mPsw = (LinearLayout) findViewById(R.id.input_layout_psw);
    mBtnLogin.setOnClickListener(this);
  }
  @Override
  public void onClick(View v) {
    // 计算出控件的高与宽
    mWidth = mBtnLogin.getMeasuredWidth();
    mHeight = mBtnLogin.getMeasuredHeight();
    // 隐藏输入框
    mName.setVisibility(View.INVISIBLE);
    mPsw.setVisibility(View.INVISIBLE);
    inputAnimator(mInputLayout, mWidth, mHeight);
  }
  
  private void inputAnimator(final View view, float w, float h) {
    AnimatorSet set = new AnimatorSet();
    ValueAnimator animator = ValueAnimator.ofFloat(0, w);
    animator.addUpdateListener(new AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        float value = (Float) animation.getAnimatedValue();
        ViewGroup.MarginLayoutParams params = (MarginLayoutParams) view
            .getLayoutParams();
        params.leftMargin = (int) value;
        params.rightMargin = (int) value;
        view.setLayoutParams(params);
      }
    });
    ObjectAnimator animator2 = ObjectAnimator.ofFloat(mInputLayout,
        "scaleX", 1f, 0.5f);
    set.setDuration(1000);
    set.setInterpolator(new AccelerateDecelerateInterpolator());
    set.playTogether(animator, animator2);
    set.start();
    set.addListener(new AnimatorListener() {
      @Override
      public void onAnimationStart(Animator animation) {
      }
      @Override
      public void onAnimationRepeat(Animator animation) {
      }
      @Override
      public void onAnimationEnd(Animator animation) {
        
        progress.setVisibility(View.VISIBLE);
        progressAnimator(progress);
        mInputLayout.setVisibility(View.INVISIBLE);
      }
      @Override
      public void onAnimationCancel(Animator animation) {
      }
    });
  }
  
  private void progressAnimator(final View view) {
    PropertyValuesHolder animator = PropertyValuesHolder.ofFloat("scaleX",
        0.5f, 1f);
    PropertyValuesHolder animator2 = PropertyValuesHolder.ofFloat("scaleY",
        0.5f, 1f);
    ObjectAnimator animator3 = ObjectAnimator.ofPropertyValuesHolder(view,
        animator, animator2);
    animator3.setDuration(1000);
    animator3.setInterpolator(new JellyInterpolator());
    animator3.start();
  }
}

至此，所有的操作已经完成了，运行项目后点击登录按钮，就可以看到效果了。

源码下载：http://xiazai.jb51.net/201607/yuanma/LoginProject(jb51.net).rar

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