android 布局之RelativeLayout(相对布局)

android 布局分为LinearLayout TableLayout RelativeLayout FreamLayout AbsoluteLayout.

 常用的有LinearLayout,TableLayout,RelativeLayout ，这几个布局不会应该手机屏幕大小而有变化。通常我们使用HVGA 大小的屏幕(320*480).

接下来我们学习RelativeLayout.

原文引入找不到了。这里记录一下。

看一下效果图吧。

还有两个常用组件的图片。

main.xml代码如果

<?xml version="1.0" encoding="utf-8"?>  
<!-- 相对布局  一个控件相对于另一个控件或者容器的位置。 -->  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
    <TextView    
        android:id="@+id/describe_view"   
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="@string/hello"  
        android:textColor="#556055"  
        />  
     <!-- 这个TextView相对于上一个TextView 在 它的下方所以设置属性为layout_below-->  
     <TextView  
        android:id="@+id/username_view"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginTop="12dp"  
        android:text="@string/username"  
        android:textColor="#556055"  
        android:layout_below="@id/describe_view"  
     />  
     <EditText  
        android:id="@+id/username_edit"  
        android:layout_width="90dp"  
        android:layout_height="40dp"  
        android:layout_marginTop="4dp"  
        android:layout_toRightOf="@id/username_view"  
        android:layout_below="@id/describe_view"  
     />  
     <TextView  
        android:id="@+id/sex_view"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginTop="12dp"  
        android:text="@string/sex"  
        android:textColor="#556055"  
        android:layout_below="@id/describe_view"  
        android:layout_toRightOf="@id/username_edit"  
     />  
     <RadioGroup  
        android:id="@+id/sex_radiogroup"  
        android:orientation="horizontal"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_toRightOf="@id/sex_view"  
        android:layout_below="@id/describe_view"  
        >  
        <!--第一个RadioButton -->  
        <RadioButton  
          android:id="@+id/male_radiobutton"  
          android:layout_width="wrap_content"  
          android:layout_height="wrap_content"  
          android:text="男" 
          android:checked="true" 
        />  
        <!--第二个RadioButton -->  
        <RadioButton  
          android:id="@+id/woman_radiobutton"  
          android:layout_width="wrap_content"  
          android:layout_height="wrap_content"  
          android:text="女"  
        />  
     </RadioGroup>  
     <TextView  
        android:id="@+id/age_view"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:paddingTop="25dp"  
        android:text="@string/age"  
        android:textColor="#556055"  
        android:layout_below="@id/username_view"  
     />  
     
       <EditText  
        android:id="@+id/brithday_edit"  
        android:layout_width="90dp"  
        android:layout_height="40dp"  
        android:layout_marginTop="4dp"  
        android:hint="@string/selectdate"  
        android:textSize="13sp"  
        android:gravity="center"  
        android:editable="false"  
        android:layout_toRightOf="@id/age_view"  
        android:layout_below="@id/username_edit"  
     />
      <TextView  
        android:id="@+id/education_view"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:paddingTop="25dp"  
        android:text="@string/education"  
        android:textColor="#556055"  
        android:layout_below="@id/sex_view"  
        android:layout_toRightOf="@id/brithday_edit"  
     />  
     <!-- 下拉列表控件 -->  
     <Spinner  
        android:id="@+id/edu_spinner"  
        android:layout_width="108dp"  
        android:layout_height="38dp"
        android:prompt="@string/prompt"  
        android:entries="@array/entries"
        android:layout_below="@id/sex_radiogroup"  
        android:layout_toRightOf="@id/education_view"  
     />  
     <TextView  
        android:id="@+id/interest_view"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:paddingTop="25dp"  
        android:text="@string/interest"  
        android:textColor="#556055"  
        android:layout_below="@id/age_view"  
     />  
     <!-- 复选框控件 -->  
     <CheckBox  
        android:id="@+id/car_check"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="@string/car"  
        android:textColor="#566156"  
        android:layout_toRightOf="@id/interest_view"  
        android:layout_below="@id/brithday_edit"  
     />  
     <CheckBox  
        android:id="@+id/sing_check"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="11dp"  
        android:text="@string/sing"  
        android:textColor="#566156"  
        android:layout_toRightOf="@id/car_check"  
        android:layout_below="@id/brithday_edit"  
     />  
     <CheckBox  
        android:id="@+id/movie_check"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="11dp"  
        android:text="@string/movie"  
        android:textColor="#566156"  
        android:layout_toRightOf="@id/sing_check"  
        android:layout_below="@id/brithday_edit"  
     />  
      <Button 
        android:layout_width="100dp"  
        android:layout_height="40dp"  
        android:text="@string/notify"
        android:id="@+id/notity"
        android:layout_marginLeft="20dp"  
        android:layout_marginTop="15dp"  
        android:layout_below="@+id/sing_check"
     />
     <Button  
        android:id="@+id/submit_button"  
        android:layout_width="100dp"  
        android:layout_height="40dp"  
        android:text="@string/submit"  
        android:gravity="center"  
        android:layout_below="@id/movie_check"  
        android:layout_marginLeft="210dp"  
        android:layout_marginTop="15dp"  
     />  
  
</RelativeLayout> 

string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, LayoutDemoActivity!</string>
    <string name="app_name">LayoutDemo</string>
    <string name="username">用	户：</string>
    <string name="sex">性别：</string>
    <string name="selectdate">出生日期</string>
    <string name="education">学历：</string>
    <string name="interest">爱	好：</string>
    <string name="age">年	龄：</string>
    <string name="car">汽车</string>
    <string name="sing">唱歌</string>
    <string name="movie">电影</string>
    <string name="submit">提交</string>
    <string name="prompt">学历</string>
    <string-array name="entries">
    <item>本科</item>
    <item>专科</item>
    <item>研究生</item>
    <item>硕士</item>
    <item>博士</item>
    </string-array>
    <string name="notify">通知</string>
    <string name="content">
     Android是一种以Linux为基础的开放源码操作系统，主要使用于便携设备。目前尚未有统一中文名称，中国大陆地区较多人使用安卓（非官方）或安致（官方）。Android操作系统最初由Andy Rubin开发，最初主要支持手机。2005年由Google收购注资，并拉拢多家制造商组成开放手机联盟开发改良，逐渐扩展到到平板电脑及其他领域上。 2010年末数据显示，仅正式推出两年的操作系统的Android已经超越称霸十年的诺基亚Symbian系统，跃居全球最受欢迎的智能手机平台。Android的主要竞争对手是苹果的IOS，微软的WP7以及RIM的Blackberry OS。
    </string>
</resources>

又下主要代码的实现，有一个通知的代码。

package com.hkrt.action;

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.Spinner;
import android.widget.Toast;

public class LayoutDemoActivity extends Activity {
	 private  EditText brithdayEditText   = null;   
	 EditText userName;
	 RadioButton male;
	 RadioButton woman;
	 Spinner  sEducation;
	 String sex=null;
	 CheckBox car,sing,movie;//爱好
	 StringBuffer hobby = new StringBuffer();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        brithdayEditText =(EditText) this.findViewById(R.id.brithday_edit);
        brithdayEditText.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Calendar c = Calendar.getInstance();
				new DatePickerDialog(LayoutDemoActivity.this,new DatePickerDialog.OnDateSetListener()
				{
					@Override
					public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) {
						brithdayEditText.setText(year+"-"+(monthOfYear+1)+"-"+dayOfMonth);
					}
				},c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH)).show();
				
			}
		});
          userName =(EditText)this.findViewById(R.id.username_edit);
          male =(RadioButton)this.findViewById(R.id.male_radiobutton);
		  woman =(RadioButton)this.findViewById(R.id.woman_radiobutton); 
		  sEducation =(Spinner)this.findViewById(R.id.edu_spinner);
		  car = (CheckBox)this.findViewById(R.id.car_check);
		  sing =(CheckBox) this.findViewById(R.id.sing_check);
		  movie = (CheckBox)this.findViewById(R.id.movie_check);
		  
		 
	
		
		  Button buttonSub = (Button)this.findViewById(R.id.submit_button);
		  buttonSub.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				if(userName.getText().toString().trim().length()==0){
				Toast toast =	Toast.makeText(getApplicationContext(), "用户名不能为空", 0);
				toast.setGravity(Gravity.CENTER, 0, 0);
				View toastView = toast.getView();
				ImageView image = new ImageView(LayoutDemoActivity.this);
				image.setImageResource(R.drawable.icon1);
				LinearLayout ll = new LinearLayout(LayoutDemoActivity.this);
				ll.addView(image);
				ll.addView(toastView);
				toast.setView(ll);
				toast.show();
				}else{
					  if(male!=null){
						  sex=male.getText().toString();
					  }else{
						  sex=woman.getText().toString();
					  }
					 
					  if(car.isChecked()){
						  hobby.append(car.getText()).append("|");
					  }  if(sing.isChecked()){
						  hobby.append(sing.getText()).append("|");
					  }  if(movie.isChecked()){
						  hobby.append(movie.getText());
					  }
					Toast.makeText(getApplicationContext(), userName.getText() +""+ sex+""+ brithdayEditText.getText()+""+sEducation.getSelectedItem().toString()+""+hobby.toString(), 0).show();
					System.out.println("结果"+userName.getText() +""+ sex+""+ brithdayEditText.getText()+""+sEducation.getSelectedItem().toString()+""+hobby.toString());
				}
			}
		});
		  /**通知的demo示例*/
		  Button notityBut = (Button)this.findViewById(R.id.notity);
		  notityBut.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(LayoutDemoActivity.this,OtherActivity.class);
				PendingIntent contentIntent = PendingIntent.getActivity(LayoutDemoActivity.this, 0, intent, 0);
				Notification notify = new Notification();
				notify.icon=R.drawable.icon1;
				//notify.sound=Uri.parse("file:///sdcard/Crazy.mp3");
				notify.tickerText="启动otherActivity通知";
				notify.when=System.currentTimeMillis();
				notify.defaults=Notification.DEFAULT_SOUND;
				notify.defaults=Notification.DEFAULT_ALL;
				notify.setLatestEventInfo(LayoutDemoActivity.this, "普通通知", "点击查看", contentIntent);
				NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
				manager.notify(0, notify);
			}
		});
    }
}

注:通知是打开另一个activity,