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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