关注微信号：javalearns?? 随时随地学Java
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随时随地学Java
前面的文章已经讲述了”随手拍”项目图像处理的技术部分,该篇文章主要是主界面的布局及屏幕滑动切换,并结合鸿洋大神的视频和郭神的第一行代码(强推两人Android博客),完成了下面的内容:
(1).学习使用Include布局XML
(2).通过添加适配器加载fragment
(3).实现滑动触摸切换屏幕ViewPager
(4).改变图标及背景,并响应fragment中控件及传递参数
一. 运行效果
如下图所示,滑动屏幕可以切换布局”空间”、”相册”、”关注”.同时会有图标颜色变蓝,背景颜色加深的效果.
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同时添加了按钮事件,在fragment1中点击按钮显示内容,在fragment3中点击按钮获取第二个布局内容并显示.
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二. 项目工程结构
三. Include布局XML文件
首先添加头部布局top_layout.xml,采用相对布局,右边两图标：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="50dp" android:paddingLeft="12dp" android:paddingRight="12dp" android:background="@drawable/image_toolbar_bg" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_gravity="center" android:orientation="horizontal" > <ImageView android:layout_width="30dp" android:layout_height="30dp" android:src="@drawable/icon_suishoupai" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="12dp" android:text="随手拍" android:textSize="15sp" android:layout_gravity="center" android:textColor="#ffffff" /> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_gravity="center" android:layout_alignParentRight="true" android:orientation="horizontal" > <ImageView android:layout_width="30dp" android:layout_height="30dp" android:src="@drawable/image_top_watch" /> <ImageView android:layout_width="30dp" android:layout_height="30dp" android:src="@drawable/image_top_add" /> </LinearLayout></RelativeLayout>
然后添加底部布局bottom_layout.xml,由3个LinearLayout水平布局组成,其中每个LinearLayout有ImageView和TextView组成：
<?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="40dp" android:background="@drawable/image_toolbar_bg" android:orientation="horizontal" > <LinearLayout android:id="@+id/bottomLayout1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:background="@drawable/image_toolbar_bg_sel" android:orientation="vertical" > <ImageView android:id="@+id/image1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="1dp" android:src="@drawable/image_bottom_effect" /> <TextView android:layout_width="wrap_content" android:layout_height="15dp" android:text="空间" android:textColor="#ffffff" android:textSize="10dp" /> </LinearLayout> <LinearLayout android:id="@+id/bottomLayout2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:orientation="vertical" > <ImageView android:id="@+id/image2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="1dp" android:src="@drawable/image_bottom_frame_no" /> <TextView android:layout_width="wrap_content" android:layout_height="15dp" android:text="相册" android:textColor="#ffffff" android:textSize="10dp" /> </LinearLayout> <LinearLayout android:id="@+id/bottomLayout3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:orientation="vertical" > <ImageView android:id="@+id/image3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="1dp" android:src="@drawable/image_bottom_person_no" /> <TextView android:layout_width="wrap_content" android:layout_height="15dp" android:text="关注" android:textColor="#ffffff" android:textSize="10dp" /> </LinearLayout> </LinearLayout>
最后在activity_main.xml中调用Include布局,ViewPager用于加载不同的fragment,并实现触屏切换在该控件上：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <include layout="@layout/top_layout"/> <android.support.v4.view.ViewPager android:id="@+id/viewpager1" android:layout_width="match_parent" android:layout_height="0dp" android:background="#ccffff" android:layout_weight="1" /> <include layout="@layout/bottom_layout"/></LinearLayout>
在MainActivity.java中onCreate函数设置无标题requestWindowFeature(Window.FEATURE_NO_TITLE),在xml文件中可设置Frame预览效果无标题,显示布局如下图所示：
四. 实现触屏切换fragment
首先设置Fragment的布局XML文件,fragment_layout1.xml如下,其他类似：
<?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" > <TextView android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="25sp" android:gravity="center" android:text="The First Fragment" /> <Button android:id="@+id/button1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Button1" /></LinearLayout>
然后添加FragmentFirst.java、FragmentSecond.java和FragmentThird,其中FragmentSecond.java如下,其他类似：
package com.example.layouttest;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class FragmentSecond extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_layout2, container, false); } }PS:由于刚学习Android一个月,所以文章很基础,在新建类中可以点击”浏览”自定义添加继承超类或点击”添加”增加接口,此处继承Fragment.注意”import android.support.v4.app.Fragment;”所有的需要一致.
然后设置MainActivity.java,代码如下：
package com.example.layouttest;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.view.Window;public class MainActivity extends FragmentActivity { //注意:导入时均为support.v4.app/view 保持一致 private ViewPager viewPager1; private FragmentPagerAdapter fpAdapter; private List<Fragment> listData; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //注意:设置无标题需要在setContentView前调用 否则会崩溃 requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); //初始化设置ViewPager setViewPager(); } private void setViewPager() { //初始化数据 viewPager1 = (ViewPager) findViewById(R.id.viewpager1); listData = new ArrayList<Fragment>(); FragmentFirst fragmentFirst = new FragmentFirst(); FragmentSecond fragmentSecond = new FragmentSecond(); FragmentThird fragmentThird = new FragmentThird(); //三个布局加入列表 listData.add(fragmentFirst); listData.add(fragmentSecond); listData.add(fragmentThird); //ViewPager相当于一组件容器 实现页面切换 fpAdapter =new FragmentPagerAdapter(getSupportFragmentManager()) { @Override public int getCount() { return listData.size(); } @Override public Fragment getItem(int arg0) { return listData.get(arg0); } }; //设置适配器 viewPager1.setAdapter(fpAdapter); }}此时即可实现触屏切换效果,但同时需要注意：
(1).需要把MainActivity继承从Activity改为FragmentActivity.
(2).可能会遇到错误”类型对于参数(FragmentFirst)不适用”,你需要把导入修改”import android.support.v4.app.Fragment;”同时注意support.v4.app/view 保持一致.
五. 实现滑屏变换图标
此时设置底部滑动切换的图标时需要添加自定义变量：
//底部图标private ImageView image1;private ImageView image2;private ImageView image3;private LinearLayout layout1;private LinearLayout layout2;private LinearLayout layout3;
然后,在setViewPager()函数中”viewPager1.setAdapter(fpAdapter)”后添加如下代码即可实现,其中switch中0、1、2对应listData中装入的三个布局：
//初始化图标image1 = (ImageView) findViewById(R.id.image1);image2 = (ImageView) findViewById(R.id.image2);image3 = (ImageView) findViewById(R.id.image3);layout1 = (LinearLayout) findViewById(R.id.bottomLayout1);layout2 = (LinearLayout) findViewById(R.id.bottomLayout2);layout3 = (LinearLayout) findViewById(R.id.bottomLayout3);//滑屏变换图标viewPager1.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int arg0) { switch(arg0) { case 0: //图片切换 image1.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_effect)); image2.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_frame_no)); image3.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_person_no)); //背景加深 layout1.setBackgroundResource(R.drawable.image_toolbar_bg_sel); layout2.setBackgroundResource(R.drawable.image_toolbar_bg); layout3.setBackgroundResource(R.drawable.image_toolbar_bg); break; case 1: //图片切换 image1.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_effect_no)); image2.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_frame)); image3.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_person_no)); //背景加深 layout1.setBackgroundResource(R.drawable.image_toolbar_bg); layout2.setBackgroundResource(R.drawable.image_toolbar_bg_sel); layout3.setBackgroundResource(R.drawable.image_toolbar_bg); break; case 2: //图片切换 image1.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_effect_no)); image2.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_frame_no)); image3.setImageDrawable(getResources().getDrawable(R.drawable.image_bottom_person)); //背景加深 layout1.setBackgroundResource(R.drawable.image_toolbar_bg); layout2.setBackgroundResource(R.drawable.image_toolbar_bg); layout3.setBackgroundResource(R.drawable.image_toolbar_bg_sel); break; } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageScrollStateChanged(int arg0) { }});六. 调用Fragment中按钮及传递参数
设置FragmentFirst.java文件,通过onActivityCreated函数实现点击按钮事件：
public class FragmentFirst extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_layout1, container, false); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); //添加Fragment1的响应事件 Button button1 = (Button) getActivity().findViewById(R.id.button1); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { TextView textView1 = (TextView) getActivity().findViewById(R.id.textView1); textView1.setText("在fragment1中点击按钮"); } }); }}FragmentThird.java实现点击Fragment3中按钮获取Fragment2中数据：
public class FragmentThird extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_layout3, container, false); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); //添加Fragment3的响应事件 Button button3 = (Button) getActivity().findViewById(R.id.button3); button3.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { TextView textView1 = (TextView) getActivity().findViewById(R.id.textView2); TextView textView3 = (TextView) getActivity().findViewById(R.id.textView3); textView3.setText("点击按钮获取fragment2信息:\n"+textView1.getText()); } }); }}PS:是否Fragment的XML文件TextView需要设置不同的id,如果Fragment1与Fragment2设置相同的textView1程序没有响应.
关注微信号：javalearns?? 随时随地学Java
或扫一扫
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随时随地学Java