編輯:Android資訊
前面的文章已經講述了”隨手拍”項目圖像處理的技術部分,該篇文章主要是主界面的布局及屏幕滑動切換,並結合鴻洋大神的視頻和郭神的第一行代碼(強推兩人Android博客),完成了下面的內容:
(1).學習使用Include布局XML
(2).通過添加適配器加載fragment
(3).實現滑動觸摸切換屏幕ViewPager
(4).改變圖標及背景,並響應fragment中控件及傳遞參數
如下圖所示,滑動屏幕可以切換布局”空間”、”相冊”、”關注”.同時會有圖標顏色變藍,背景顏色加深的效果.
同時添加了按鈕事件,在fragment1中點擊按鈕顯示內容,在fragment3中點擊按鈕獲取第二個布局內容並顯示.
首先添加頭部布局top_layout.xml,采用相對布局,右邊兩圖標:
<?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="隨手拍" 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>
然後添加底部布局bottom_layout.xml,由3個LinearLayout水平布局組成,其中每個LinearLayout有ImageView和TextView組成:
<?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="空間" 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="相冊" 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="關注" android:textColor="#ffffff" android:textSize="10dp" /> </LinearLayout> </LinearLayout>
最後在activity_main.xml中調用Include布局,ViewPager用於加載不同的fragment,並實現觸屏切換在該控件上:
<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函數設置無標題requestWindowFeature(Window.FEATURE_NO_TITLE),在xml文件中可設置Frame預覽效果無標題,顯示布局如下圖所示:
<?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>
然後添加FragmentFirst.java、FragmentSecond.java和FragmentThird,其中FragmentSecond.java如下,其他類似:
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:由於剛學習Android一個月,所以文章很基礎,在新建類中可以點擊”浏覽”自定義添加繼承超類或點擊”添加”增加接口,此處繼承Fragment.注意”import android.support.v4.app.Fragment;”所有的需要一致.
然後設置MainActivity.java,代碼如下:
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:導入時均為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:設置無標題需要在setContentView前調用 否則會崩潰 requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); //初始化設置ViewPager setViewPager(); } private void setViewPager() { //初始化數據 viewPager1 = (ViewPager) findViewById(R.id.viewpager1); listData = new ArrayList<Fragment>(); FragmentFirst fragmentFirst = new FragmentFirst(); FragmentSecond fragmentSecond = new FragmentSecond(); FragmentThird fragmentThird = new FragmentThird(); //三個布局加入列表 listData.add(fragmentFirst); listData.add(fragmentSecond); listData.add(fragmentThird); //ViewPager相當於一組件容器 實現頁面切換 fpAdapter =new FragmentPagerAdapter(getSupportFragmentManager()) { @Override public int getCount() { return listData.size(); } @Override public Fragment getItem(int arg0) { return listData.get(arg0); } }; //設置適配器 viewPager1.setAdapter(fpAdapter); } }
此時即可實現觸屏切換效果,但同時需要注意:
(1).需要把MainActivity繼承從Activity改為FragmentActivity.
(2).可能會遇到錯誤”類型對於參數(FragmentFirst)不適用”,你需要把導入修改”import android.support.v4.app.Fragment;”同時注意support.v4.app/view 保持一致.
此時設置底部滑動切換的圖標時需要添加自定義變量:
//底部圖標 private ImageView image1; private ImageView image2; private ImageView image3; private LinearLayout layout1; private LinearLayout layout2; private LinearLayout layout3;
然後,在setViewPager()函數中”viewPager1.setAdapter(fpAdapter)”後添加如下代碼即可實現,其中switch中0、1、2對應listData中裝入的三個布局:
//初始化圖標 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); //滑屏變換圖標 viewPager1.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int arg0) { switch(arg0) { case 0: //圖片切換 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: //圖片切換 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: //圖片切換 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) { } });
設置FragmentFirst.java文件,通過onActivityCreated函數實現點擊按鈕事件:
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的響應事件 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中點擊按鈕"); } }); } }
FragmentThird.java實現點擊Fragment3中按鈕獲取Fragment2中數據:
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的響應事件 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("點擊按鈕獲取fragment2信息:\n"+textView1.getText()); } }); } }
PS:是否Fragment的XML文件TextView需要設置不同的id,如果Fragment1與Fragment2設置相同的textView1程序沒有響應.
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