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);   }  } }