android中viewPager实现的屏幕左右切换(入门篇)
大多数的APP都可以实现几个屏幕来回的切换,
首先新建两个Activity,内容随意,布局随意。接下来在MainActivity.xml:
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 tools:context=".MainActivity" > 6 7 <android.support.v4.view.ViewPager 8 android:id="@+id/viewpager" 9 android:layout_width="wrap_content" 10 android:layout_height="wrap_content" > 11 </android.support.v4.view.ViewPager> 12 13 </RelativeLayou
不要忘记android-support-v4包,目前4.0以上版本都自带
接下来是java中的方法:
1 protected void onCreate(Bundle savedInstanceState) { 2 super.onCreate(savedInstanceState); 3 setContentView(R.layout.activity_main); 4 viewPager = (ViewPager) findViewById(R.id.viewpager); 5 View view1 = LayoutInflater.from(MainActivity.this).inflate(R.layout.a, 6 null); 7 View view2 = LayoutInflater.from(MainActivity.this).inflate(R.layout.b, 8 null); 9 list = new ArrayList<View>(); 10 list.add(view1); 11 list.add(view2); 12 viewPager.setAdapter(new MyAdapter()); 13 }
1 class MyAdapter extends PagerAdapter { 2 3 @Override 4 public int getCount() { 5 return list.size(); 6 } 7 8 @Override 9 public boolean isViewFromObject(View arg0, Object arg1) { 10 return arg0 == arg1; 11 } 12 13 @Override 14 public CharSequence getPageTitle(int position) { 15 return titlelist.get(position); 16 17 } 18 19 @Override 20 public Object instantiateItem(View container, int position) { 21 ((ViewPager) container).addView(list.get(position)); 22 return list.get(position); 23 } 24 25 @Override 26 public void destroyItem(View container, int position, Object object) { 27 super.destroyItem(container, position, object); 28 ((ViewPager) container).removeView(list.get(position)); 29 } 30 }
至此就可以实现两个屏幕的切换
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