Android仿QQ登陆窗口实现原理

今天根据腾讯qq，我们做一个练习，来学习如何制作一个漂亮的布局。首先看一下官方图片

还是一个启动画面，之后进入登录页面，导航页面就不介绍了，大家可以参考微信的导航页面。首先程序进入SplashActivity，就是启动页面，Activity代码如下：

package com.example.imitateqq; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.os.Handler; 

public class SplashActivity extends Activity { 

private Intent intent; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.splash); 
startMainAvtivity(); 
} 

private void startMainAvtivity() { 
new Handler().postDelayed(new Runnable() { 
public void run() { 
intent=new Intent(SplashActivity.this,QQ.class); 
startActivity(intent); 
SplashActivity.this.finish();//结束本Activity 
} 
}, 1000);//设置执行时间 
} 
}

xml布局文件就是一个全屏的图片，要注意的是设置android:scaleType ="matrix"这个属性。不然不会全屏

复制代码代码如下:

<? 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= "match_parent" 
android:orientation= "vertical" > 
< ImageView 
android:layout_width ="match_parent" 
android:layout_height ="match_parent" 
android:scaleType ="matrix" 
android:src ="@drawable/splash" /> 
</ LinearLayout>

过1秒之后转入登陆页面，从图片我们可以看出，腾讯的UI做的还是相当美观漂亮的，既简洁又不失美观。先分析一下这个登录界面，从整体可以看出，根布局的背景色是蓝色的，而那个QQ 2012 Android其实是一个图片背景色和根布局的背景色一样，这样就不会有视觉偏差。下面就是两个文本框EditText了，注意这里和官方给的不一样，因为后面有一个小箭头，当点击这个箭头时，会在第一个文本框的下面显示已经输入的qq号码，在qq号码的后面还有删除qq信息的按钮。这个地方需要注意一下。再往下就是登陆Button以及那连个“记住密码”和“注册新账号”比较简单，注意位置的安排即可。最后就是最下面的“更多登陆选项”，当点击的时候会向上弹出一些内容，其实就是一个隐藏的布局，当点击上面的时候，使下面隐藏的布局显示。当然也可以使用滑动抽屉来做，但是相对来说比较麻烦。下面看一下xml代码，相信大家就会一路了然。

复制代码代码如下:

< 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= "@drawable/login_bg" > 

< ImageView 
android:id ="@+id/loginbutton" 
android:layout_width ="wrap_content" 
android:layout_height ="wrap_content" 
android:layout_centerHorizontal ="true" 
android:layout_marginTop ="50dp" 
android:src ="@drawable/login_pic" /> 

<LinearLayout 
android:id ="@+id/input" 
android:layout_width ="fill_parent" 
android:layout_height ="wrap_content" 
android:layout_below ="@id/loginbutton" 
android:layout_marginLeft ="28.0dip" 
android:layout_marginRight ="28.0dip" 
android:background ="@drawable/login_input" 
android:orientation ="vertical" > 

< LinearLayout 
android:layout_width ="fill_parent" 
android:layout_height ="44.0dip" 
android:background ="@drawable/login_input" 
android:gravity ="center_vertical" 
android:orientation ="horizontal" > 

< EditText 
android:id ="@+id/searchEditText" 
android:layout_width ="0dp" 
android:layout_height ="fill_parent" 
android:layout_weight ="1" 
android:background ="@null" 
android:ems ="10" 
android:imeOptions ="actionDone" 
android:singleLine ="true" 
android:textSize ="16sp" > 

< requestFocus /> 
</ EditText> 

< Button 
android:id ="@+id/button_clear" 
android:layout_width ="20dip" 
android:layout_height ="20dip" 
android:layout_marginRight ="8dip" 
android:background ="@drawable/login_input_arrow" 
android:visibility ="visible" /> 
</ LinearLayout> 

< View 
android:layout_width ="fill_parent" 
android:layout_height ="1.0px" 
android:layout_marginLeft ="1.0px" 
android:layout_marginRight ="1.0px" 
android:background ="#ffc0c3c4" /> 

< EditText 
android:id ="@+id/password" 
android:layout_width ="fill_parent" 
android:layout_height ="44.0dip" 
android:background ="#00ffffff" 
android:gravity ="center_vertical" 
android:inputType ="textPassword" 
android:maxLength ="16" 
android:maxLines ="1" 
android:textColor ="#ff1d1d1d" 
android:textColorHint ="#ff666666" 
android:textSize ="16.0sp" /> 
</LinearLayout > 

<Button 
android:id ="@+id/buton1" 
android:layout_width ="270dp" 
android:background ="@drawable/chat_send_button_bg" 
android:paddingTop ="5.0dip" 
android:layout_height ="50dp" 
android:layout_marginLeft ="28.0dip" 
android:layout_marginRight ="28.0dip" 
android:layout_marginTop ="12.0dip" 
android:layout_below ="@+id/input" 
android:gravity ="center" 
android:textSize ="20dp" 
android:text = "登录" /> 

<RelativeLayout 
android:id ="@+id/relative" 
android:layout_width ="fill_parent" 
android:layout_height ="wrap_content" 
android:layout_alignLeft ="@+id/input" 
android:layout_alignRight ="@+id/input" 
android:layout_below ="@id/buton1" > 

< CheckBox 
android:id ="@+id/auto_save_password" 
android:layout_width ="wrap_content" 
android:layout_height ="wrap_content" 
android:layout_alignParentLeft ="true" 
android:background ="@null" 
android:button ="@null" 
android:checked ="true" 
android:drawableLeft ="@drawable/checkbox_bg1" 
android:drawablePadding ="4.0dip" 
android:text = "记住密码" 
android:textColor ="#ffffffff" 
android:textSize ="12.0sp" /> 

< Button 
android:id ="@+id/regist" 
android:layout_width ="wrap_content" 
android:layout_height ="wrap_content" 
android:layout_alignParentRight ="true" 
android:background ="@drawable/login_reg_normal" 
android:clickable ="true" 
android:gravity ="left|center" 
android:paddingLeft ="8.0dip" 
android:paddingRight ="18.0dip" 
android:text = "注册新账号" 
android:textColor ="#ffffffff" 
android:textSize ="12.0sp" /> 
</RelativeLayout > 

<LinearLayout 
android:id ="@+id/more_bottom" 
android:layout_width ="fill_parent" 
android:layout_height ="wrap_content" 
android:layout_alignParentBottom ="true" 
android:background ="@drawable/login_moremenu_back" 
android:orientation ="vertical" > 

<RelativeLayout 
android:id ="@+id/input2" 
android:layout_width ="fill_parent" 
android:layout_height ="40dp" 
android:background ="@drawable/login_moremenu_back" 
android:orientation ="vertical" > 

< ImageView 
android:id ="@+id/more_image" 
android:layout_width ="wrap_content" 
android:layout_height ="wrap_content" 
android:layout_centerVertical ="true" 
android:layout_marginRight ="5.0dip" 
android:layout_toLeftOf ="@+id/more_text" 
android:clickable ="false" 
android:src ="@drawable/login_more_up" /> 

< TextView 
android:id ="@+id/more_text" 
android:layout_width ="wrap_content" 
android:layout_height ="wrap_content" 
android:layout_centerInParent ="true" 
android:background ="@null" 
android:gravity ="center" 
android:maxLines ="1" 
android:text = "更多登陆选项" 
android:textColor ="#ffc6e6f9" 
android:textSize ="14.0sp" /> 
</RelativeLayout > 
<LinearLayout 
android:id ="@+id/morehidebottom" 
android:layout_width ="fill_parent" 
android:layout_height ="wrap_content" 
android:orientation ="vertical" 
android:visibility ="gone" > 

< View 
android:layout_width ="fill_parent" 
android:layout_height ="1.0px" 
android:background ="#ff005484" /> 

< View 
android:layout_width ="fill_parent" 
android:layout_height ="1.0px" 
android:background ="#ff0883cb" /> 

< LinearLayout 
android:layout_width ="fill_parent" 
android:layout_height ="wrap_content" 
android:layout_marginLeft ="30.0dip" 
android:layout_marginRight ="30.0dip" 
android:layout_marginTop ="12.0dip" 
android:orientation ="horizontal" > 

< CheckBox 
android:id ="@+id/hide_login" 
android:layout_width ="1.0px" 
android:layout_height ="wrap_content" 
android:layout_weight ="2.0" 
android:background ="@null" 
android:button ="@null" 
android:checked ="false" 
android:drawableLeft ="@drawable/checkbox_bg1" 
android:drawablePadding ="4.0dip" 
android:text = "隐身登陆" 
android:textColor ="#ffc6e6f9" 
android:textSize ="12.0sp" /> 

< CheckBox 
android:id ="@+id/silence_login" 
android:layout_width ="1.0px" 
android:layout_height ="wrap_content" 
android:layout_weight ="1.0" 
android:background ="@null" 
android:button ="@null" 
android:checked ="false" 
android:drawableLeft ="@drawable/checkbox_bg1" 
android:drawablePadding ="4.0dip" 
android:text = "静音登录" 
android:textColor ="#ffc6e6f9" 
android:textSize ="12.0sp" /> 
</ LinearLayout> 

< LinearLayout 
android:layout_width ="fill_parent" 
android:layout_height ="wrap_content" 
android:layout_marginBottom ="18.0dip" 
android:layout_marginLeft ="30.0dip" 
android:layout_marginRight ="30.0dip" 
android:layout_marginTop ="18.0dip" 
android:orientation ="horizontal" > 

< CheckBox 
android:id ="@+id/accept_accounts" 
android:layout_width ="1.0px" 
android:layout_height ="wrap_content" 
android:layout_weight ="2.0" 
android:background ="@null" 
android:button ="@null" 
android:checked ="true" 
android:drawableLeft ="@drawable/checkbox_bg1" 
android:drawablePadding ="4.0dip" 
android:singleLine ="true" 
android:text = "允许手机/电脑同时在心线" 
android:textColor ="#ffc6e6f9" 
android:textSize ="12.0sp" /> 

< CheckBox 
android:id ="@+id/accept_troopmsg" 
android:layout_width ="1.0px" 
android:layout_height ="wrap_content" 
android:layout_weight ="1.0" 
android:background ="@null" 
android:button ="@null" 
android:checked ="true" 
android:drawableLeft ="@drawable/checkbox_bg1" 
android:drawablePadding ="4.0dip" 
android:text = "接受群消息" 
android:textColor ="#ffc6e6f9" 
android:textSize ="12.0sp" /> 
</ LinearLayout> 
</ LinearLayout> 

</LinearLayout > 

</ RelativeLayout>

各个组件的使用没有问题，关键是如何设置他们的属性，来获得一个比较美观的效果，大家可以参考这个例子，来做一下练习，来强化UI的设计。从这个例子中就可以学到很多东西，比如ViwGroup的使用（如何枪套），background的设置，例如同时使用两个Edittext,设置android:background ="@null"设置为空的时候就不会产生间隔了。这个要自己多做设计，时间长了就会有感悟了。最后看一下MainActivity的代码，布局简单

复制代码代码如下:

package com.example.imitateqq; 

import android.os.Bundle; 
import android.app.Activity; 
import android.app.Dialog; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ImageView; 

public class QQ extends Activity implements OnClickListener{ 

private Button login_Button; 
private View moreHideBottomView,input2; 
private ImageView more_imageView; 
private boolean mShowBottom = false; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_qq); 
initView(); 
} 

private void initView() { 
login_Button=(Button) findViewById(R.id.buton1); 
login_Button.setOnClickListener(this); 

moreHideBottomView=findViewById(R.id.morehidebottom); 
more_imageView=(ImageView) findViewById(R.id.more_image); 

input2=findViewById(R.id.input2); 
input2.setOnClickListener( this); 
} 

public void showBottom(boolean bShow){ 
if(bShow){ 
moreHideBottomView.setVisibility(View.GONE); 
more_imageView.setImageResource(R.drawable.login_more_up); 
mShowBottom = true; 
}else{ 
moreHideBottomView.setVisibility(View.VISIBLE); 
more_imageView.setImageResource(R.drawable.login_more); 
mShowBottom = false; 
} 
} 

public void onClick(View v) { 
switch(v.getId()) 
{ 
case R.id.input2: 
showBottom(!mShowBottom); 
break; 
case R.id.buton1: 
showRequestDialog(); 
break; 
default: 
break; 
} 
} 

private Dialog mDialog = null; 
private void showRequestDialog() 
{ 
if (mDialog != null) 
{ 
mDialog.dismiss(); 
mDialog = null; 
} 
mDialog = DialogFactory.creatRequestDialog(this, "正在验证账号..."); 
mDialog.show(); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
getMenuInflater().inflate(R.menu.activity_qq, menu); 
return true; 
} 
}

最后效果如下：

总结：本文可以作为一个UI练习Demo，大家可以自己独立去写，有问题的可以留下邮箱我给你发一下源码作为参考。下一篇将写主页面的实现，欢迎大家关注。