Android实现登陆页logo随键盘收放动态伸缩（完美解决键盘弹出遮挡控件的问题）

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 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="@color/white" 
 tools:context=".login.LoginActivity" 
 android:orientation="vertical" 
 android:id="@+id/ll_login_root"> 
 <LinearLayout 
  android:orientation="vertical" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_marginTop="90dp" 
  android:id="@+id/ll_login_logobg" 
  android:layout_marginBottom="50dp"> 
  <ImageView 
   android:layout_width="160dp" 
   android:layout_height="160dp" 
   android:id="@+id/iv_login_logo" 
   android:background="@mipmap/login_logo" 
   android:layout_gravity="center_horizontal" /> 
 </LinearLayout> 
 <LinearLayout 
  android:orientation="vertical" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:layout_marginLeft="50dp" 
  android:layout_marginRight="50dp"> 
  <LinearLayout 
   android:orientation="horizontal" 
   android:layout_width="match_parent" 
   android:layout_height="50dp"> 
   <ImageView 
    android:layout_width="45dp" 
    android:layout_height="45dp" 
    android:background="@mipmap/login_phone" 
    android:id="@+id/imageView2" 
    android:layout_gravity="bottom" /> 
   <EditText 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:inputType="phone" 
    android:ems="10" 
    android:id="@+id/et_login_phone" 
    android:layout_gravity="center" 
    android:hint="请输入手机号" 
    android:background="@null" 
    android:maxLength="11"/> 
  </LinearLayout> 
  <LinearLayout 
   android:orientation="vertical" 
   android:layout_width="match_parent" 
   android:layout_height="1dp" 
   android:background="@color/text_gray"></LinearLayout> 
  <LinearLayout 
   android:orientation="horizontal" 
   android:layout_width="match_parent" 
   android:layout_height="50dp" > 
   <ImageView 
    android:layout_width="45dp" 
    android:layout_height="45dp" 
    android:background="@mipmap/login_password" 
    android:id="@+id/imageView3" 
    android:layout_gravity="bottom" /> 
   <EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="phone" 
    android:ems="10" 
    android:id="@+id/et_login_code" 
    android:layout_gravity="center" 
    android:layout_weight="1" 
    android:hint="请输入验证码" 
    android:background="@null" 
    android:maxLength="6"/> 
   <Button 
    android:layout_width="90dp" 
    android:layout_height="30dp" 
    android:text="获取验证码" 
    android:textColor="@color/white" 
    android:id="@+id/bt_login_getcode" 
    android:background="@mipmap/login_button_blue" 
    android:layout_gravity="center_vertical" 
    android:textSize="14dp" /> 
  </LinearLayout> 
  <LinearLayout 
   android:orientation="vertical" 
   android:layout_width="match_parent" 
   android:layout_height="1dp" 
   android:background="@color/text_gray" 
   android:layout_marginBottom="10dp" /> 
  <LinearLayout 
   android:orientation="horizontal" 
   android:layout_width="match_parent" 
   android:layout_height="20dp" 
   android:id="@+id/ll_login_warning" 
   android:visibility="gone"> 
   <ImageView 
    android:layout_width="25dp" 
    android:layout_height="25dp" 
    android:background="@mipmap/login_warning" 
    android:id="@+id/imageView" 
    android:layout_gravity="center_vertical" /> 
   <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:text="请输入验证码" 
    android:id="@+id/tv_login_wraning" 
    android:layout_gravity="center_vertical" 
    android:textColor="@color/text_red" 
    android:textSize="13dp" /> 
  </LinearLayout> 
  <Button 
   android:layout_width="match_parent" 
   android:layout_height="40dp" 
   android:textColor="@color/white" 
   android:id="@+id/bt_login_submit" 
   android:background="@mipmap/login_button_gray" 
   android:text="登 录" 
   android:textSize="18dp" 
   android:layout_marginTop="10dp" /> 
 </LinearLayout> 
</LinearLayout>

package com.millionideas.cm.login; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.Bundle; 
import android.os.Handler; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
import com.millionideas.cm.R; 
import com.millionideas.cm.home.HomeActivity; 
import com.millionideas.cm.main.BaseActivity; 
import com.millionideas.cm.tools.TimeCountUtils; 
import org.xutils.view.annotation.ContentView; 
import org.xutils.view.annotation.Event; 
import org.xutils.view.annotation.ViewInject; 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
@ContentView(R.layout.activity_login) 
public class LoginActivity extends BaseActivity implements View.OnLayoutChangeListener{ 
//用xUtils进行控件绑定 
 @ViewInject(R.id.iv_login_logo) 
 ImageView iv_login_logo; 
 @ViewInject(R.id.ll_login_logobg) 
 LinearLayout ll_login_logobg; 
 @ViewInject(R.id.et_login_phone) 
 EditText et_login_phone; 
 @ViewInject(R.id.et_login_code) 
 EditText et_login_code; 
 @ViewInject(R.id.ll_login_warning) 
 LinearLayout ll_login_warning; 
 @ViewInject(R.id.tv_login_wraning) 
 TextView tv_login_wraning; 
 @ViewInject(R.id.bt_login_getcode) 
 Button bt_login_getcode; 
 @ViewInject(R.id.bt_login_submit) 
 Button bt_login_submit; 
 @ViewInject(R.id.ll_login_root) 
 LinearLayout activityRootView;//需要操作的布局 
 private TimeCountUtils timeCountUtils; 
 private Matcher phone_num; 
 private Pattern phonenumber; 
 private ProgressDialog progressDialog; 
 private Handler handler; 
 private int screenHeight = 0;//屏幕高度 
 private int keyHeight = 0; //软件盘弹起后所占高度 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  screenHeight = this.getWindowManager().getDefaultDisplay().getHeight(); //获取屏幕高度 
  keyHeight = screenHeight / 3;//弹起高度为屏幕高度的1/3 
  timeCountUtils = new TimeCountUtils(LoginActivity.this, 60000, 1000, bt_login_getcode);//时间工具类用以实现倒计时 
  progressDialog=new ProgressDialog(this);//对话框 
  handler=new Handler(); 
  bt_login_submit.setClickable(false); 
  et_login_phone.addTextChangedListener(new TextWatcher() {//为edittext添加文本改变监听，根据是否有文本输入更改确认按钮的背景颜色 
   @Override 
   public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { 
   } 
   @Override 
   public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { 
   } 
   @Override 
   public void afterTextChanged(Editable editable) { 
    if (!et_login_phone.getText().toString().equals("")){ 
     bt_login_submit.setClickable(true); 
     bt_login_submit.setBackgroundResource(R.drawable.login_button); 
    }else { 
     bt_login_submit.setClickable(false); 
     bt_login_submit.setBackgroundResource(R.mipmap.login_button_gray); 
    } 
   } 
  }); 
 } 
 //xUtils的事件处理 
 @Event(value = {R.id.bt_login_submit, R.id.bt_login_getcode}, type = View.OnClickListener.class) 
 private void onClick(View view) { 
  switch (view.getId()) { 
   case R.id.bt_login_submit://确认按钮事件 
    if (!CheckPhone(et_login_phone).matches()) {//判断手机号格式 
     ll_login_warning.setVisibility(View.VISIBLE); 
     tv_login_wraning.setText("手机号码格式不正确"); 
    } else if (!et_login_code.getText().toString().equals("000")) {//验证码判断，为方便测试设置了默认值 
     ll_login_warning.setVisibility(View.VISIBLE); 
     tv_login_wraning.setText("验证码不正确"); 
    } else {//条件全部满足，开始登陆 
     ll_login_warning.setVisibility(View.GONE); 
     progressDialog.setMessage("正在登录…"); 
     progressDialog.show();//弹出加载对话框 
     handler.postDelayed(new Runnable() {//设置一个1s的延时操作模拟登陆的过程 
      @Override 
      public void run() {//登陆成功关掉对话框，跳转页面，关掉本页 
       progressDialog.dismiss();//不能用hide 
       Intent intent=new Intent(LoginActivity.this, HomeActivity.class); 
       startActivity(intent); 
       LoginActivity.this.finish(); 
      } 
     },1000); 
    } 
    break; 
   case R.id.bt_login_getcode: 
    if (CheckPhone(et_login_phone).matches()) {//手机号正确则获取验证码，开启倒计时 
     ll_login_warning.setVisibility(View.GONE); 
     bt_login_getcode.setBackgroundResource(R.mipmap.login_button_gray); 
     timeCountUtils.start(); 
    } else { 
     ll_login_warning.setVisibility(View.VISIBLE); 
     tv_login_wraning.setText("手机号码格式不正确"); 
    } 
    break; 
  } 
 } 
 public Matcher CheckPhone(EditText editText) {//判断手机号格式 
  phonenumber = Pattern 
    .compile("^[1][3-8][0-9]{9}$"); 
  phone_num = phonenumber.matcher(editText.getText() 
    .toString()); 
  return phone_num; 
 } 
 @Override 
 protected void onResume() { 
  super.onResume(); 
  activityRootView.addOnLayoutChangeListener(this);//给需要操作的布局设置监听 
 } 
 @Override 
 public void onLayoutChange(View v, int left, int top, int right, 
        int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { 
  /* old是改变前的左上右下坐标点值，没有old的是改变后的左上右下坐标点值 
  现在认为只要控件将Activity向上推的高度超过了1/3屏幕高，就认为软键盘弹起*/ 
  if (oldBottom != 0 && bottom != 0 && (oldBottom - bottom > keyHeight)) { 
   ViewGroup.LayoutParams params = iv_login_logo.getLayoutParams();//获取布局，设置键盘弹起后logo的宽高 
   params.height = 300; 
   params.width = 300; 
   iv_login_logo.setLayoutParams(params); 
   LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(ll_login_logobg.getLayoutParams()); 
   lp.setMargins(0, 90, 0, 50);//设置包含logo的布局的位置 
   ll_login_logobg.setLayoutParams(lp); 
  } else if (oldBottom != 0 && bottom != 0 && (bottom - oldBottom > keyHeight)) {//键盘收回后，logo恢复原来大小，位置同样回到初始位置 
   ViewGroup.LayoutParams params = iv_login_logo.getLayoutParams(); 
   params.height = 480; 
   params.width = 480; 
   iv_login_logo.setLayoutParams(params); 
   LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(ll_login_logobg.getLayoutParams()); 
   lp.setMargins(0, 270, 0, 150); 
   ll_login_logobg.setLayoutParams(lp); 
  } 
 } 
}