前言

比如在进行登录的操作中，用户输入完密码之后，肯定是想直接点击登录按钮的。返回键隐藏软键盘这样的体验肯定很糟糕，程序员，遇到问题解决问题。

实现1

xml

<ScrollView
android:id="@+id/scrollview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fadingEdge="none"
android:scrollbars="none">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:src="@mipmap/ic_loginhead"/>

<EditText
android:id="@+id/et_usernamelogin_username"
style="@style/customEditText"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="10dp"
android:background="@null"
android:hint="请输入已验证手机"
android:inputType="number"
android:lines="1"
android:maxLength="11"/>

<ImageView
android:layout_width="match_parent"
android:layout_height="2px"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:background="@color/pating_line"/>

<EditText
android:id="@+id/et_usernamelogin_password"
style="@style/customEditText"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="20dp"
android:background="@null"
android:digits="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_?"
android:hint="请输入密码"
android:inputType="textPassword"/>

<ImageView
android:layout_width="match_parent"
android:layout_height="2px"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:background="@color/pating_line"/>

<Button
android:id="@+id/btn_usernamelogin_dologin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:layout_marginTop="30dp"
android:background="@drawable/btn_selecter"
android:enabled="false"
android:text="登录"
android:textColor="@color/white"
/>

</LinearLayout>
</ScrollView>

java

mScrollView=(ScrollView)view.findViewById(R.id.scrollview);
usernamelogin_username.setOnTouchListener(newView.OnTouchListener(){
@Override
publicbooleanonTouch(Viewv,MotionEventevent){
changeScrollView();

returnfalse;
}
});
usernamelogin_password.setOnTouchListener(newView.OnTouchListener(){
@Override
publicbooleanonTouch(Viewv,MotionEventevent){
changeScrollView();

returnfalse;
}
});




  /**
  *使ScrollView指向底部
  */
  privatevoidchangeScrollView(){
  newHandler().postDelayed(newRunnable(){
  @Override
  publicvoidrun(){
  mScrollView.scrollTo(0,mScrollView.getHeight());
    }
  },300);
  }

实现2

xml同上

anim下新建gone.xml

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"               
  android:fromXScale="1.0"      
  android:toXScale="0.0"    
  android:fromYScale="1.0"  
  android:toYScale="0.0"    
  android:pivotX="50%"    
  android:pivotY="50%"    
  android:duration="500" 
  android:repeatCount="0"/>

visiable.xml

  <?xml version="1.0" encoding="utf-8"?>
  <scale xmlns:android="http://schemas.android.com/apk/res/android" 
  android:fromXScale="0.0"   
  android:toXScale="1.0"   
  android:fromYScale="0.0" 
  android:toYScale="1.0"    
  android:pivotX="50%"     
  android:pivotY="50%"    
  android:duration="500"     
  android:repeatCount="0"/>

或者直接在代码中

importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.support.v7.app.AppCompatActivity;
importandroid.view.KeyEvent;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.view.animation.Animation;
importandroid.view.animation.AnimationSet;
importandroid.view.animation.ScaleAnimation;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.ImageView;

publicclassMainActivityextendsAppCompatActivity{

privateImageViewmHead;//头部ImageView

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHead=(ImageView)findViewById(R.id.iv_head);
finalButtonbtn=(Button)findViewById(R.id.btn_usernamelogin_dologin);

finalEditTextet_pass=(EditText)findViewById(R.id.et_usernamelogin_password);
finalEditTextet_name=(EditText)findViewById(R.id.et_usernamelogin_username);


/**
*当输入被点击
*/
et_name.setOnTouchListener(newView.OnTouchListener(){
@Override
publicbooleanonTouch(Viewv,MotionEventevent){

start();

returnfalse;
}
});

btn.setEnabled(false);

btn.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){


}
});


}

privatevoidstart(){
AnimationSetanimationSet=newAnimationSet(true);
ScaleAnimationscaleAnimation=newScaleAnimation(
1,0.1f,1,0.1f,
Animation.RELATIVE_TO_SELF,0.5f,
Animation.RELATIVE_TO_SELF,0.5f);
scaleAnimation.setDuration(500);
animationSet.addAnimation(scaleAnimation);
animationSet.setFillAfter(true);
animationSet.setFillBefore(false);
animationSet.setRepeatCount(0);//设置重复次数
mHead.startAnimation(scaleAnimation);
newHandler().postDelayed(newRunnable(){
@Override
publicvoidrun(){
mHead.setVisibility(View.GONE);
}
},500);
}

/**
*菜单、返回键响应
*/
@Override
publicbooleanonKeyDown(intkeyCode,KeyEventevent){
//TODOAuto-generatedmethodstub
if(keyCode==KeyEvent.KEYCODE_BACK){
if(mHead.getVisibility()==View.GONE){
AnimationSetanimationSet=newAnimationSet(true);
ScaleAnimationscaleAnimation=newScaleAnimation(
0.1f,1f,0.1f,1f,
Animation.RELATIVE_TO_SELF,0.5f,
Animation.RELATIVE_TO_SELF,0.5f);
scaleAnimation.setDuration(500);
animationSet.addAnimation(scaleAnimation);
animationSet.setFillAfter(true);
animationSet.setFillBefore(false);
mHead.startAnimation(scaleAnimation);

mHead.setVisibility(View.VISIBLE);

}else{
finish();
}

}
returnfalse;
  }
}

效果呢：