編輯:關於android開發
1 在ViewPager的適配器中的getCount()長度設置無限大Integer.MAX_VALUE
2 明白當前currentIten 為position % images.length;
3 設置一開始ViewPager的位置 viewPager.setCurrentItem((images.length) * 1000);這樣剛開始就可以向左滑動了
4 在OnPageChangeListener ViewPager的滑動監聽中設置小點的位置
5 設置Handler 定時滑動開啟滑動
6 在onResume中發送空消息,在onPause中移除消息將所有的Callbacks和Messages全部清除掉,避免內存洩露。
如下是主代碼 圖片是本地的
1 package com.demo.sb.main; 2 3 import java.util.ArrayList; 4 import com.demo.sb.utils.DensityUtil; 5 import com.demo.suibian.R; 6 import android.annotation.SuppressLint; 7 import android.app.Activity; 8 import android.os.Bundle; 9 import android.os.Handler; 10 import android.support.v4.view.PagerAdapter; 11 import android.support.v4.view.ViewPager; 12 import android.support.v4.view.ViewPager.OnPageChangeListener; 13 import android.view.MotionEvent; 14 import android.view.View; 15 import android.view.View.OnClickListener; 16 import android.view.View.OnTouchListener; 17 import android.view.ViewGroup; 18 import android.widget.ImageView; 19 import android.widget.LinearLayout; 20 21 public class MActivity_Luenbo extends Activity { 22 23 private ViewPager viewPager; 24 private LinearLayout group; 25 private int[] images = { R.drawable.a, R.drawable.c, R.drawable.d, 26 R.drawable.guide_1, R.drawable.guide_2 }; 27 private ArrayList<ImageView> mImageViewList; 28 private ImageView[] diandian;// ViewPager上的點點 29 private int selectedItem = 0; 30 31 @Override 32 protected void onCreate(Bundle savedInstanceState) { 33 // TODO Auto-generated method stub 34 super.onCreate(savedInstanceState); 35 setContentView(R.layout.mactivity_luenbo); 36 viewPager = (ViewPager) findViewById(R.id.vp_viewPager); 37 group = (LinearLayout) findViewById(R.id.ll_viewGroup); 38 init(); 39 40 } 41 42 @SuppressLint("HandlerLeak") 43 private Handler mHandler = new Handler() { 44 public void handleMessage(android.os.Message msg) { 45 viewPager.setCurrentItem(selectedItem + 1); 46 mHandler.sendEmptyMessageDelayed(0, 3000); 47 }; 48 }; 49 50 private void init() { 51 // TODO Auto-generated method stub 52 // 引導3個ViewPager 53 mImageViewList = new ArrayList<ImageView>(); 54 for (int i = 0; i < images.length; i++) { 55 ImageView imageView = new ImageView(this); 56 imageView.setBackgroundResource(images[i]); 57 mImageViewList.add(imageView); 58 } 59 60 // 將點點加入到ViewGroup中 61 diandian = new ImageView[images.length]; 62 for (int i = 0; i < images.length; i++) { 63 // 循環加入點點圖片組 64 diandian[i] = new ImageView(this); 65 if (i == 0) { 66 diandian[i].setImageResource(R.drawable.page_indicator_focused); 67 } else { 68 diandian[i] 69 .setImageResource(R.drawable.page_indicator_unfocused); 70 } 71 diandian[i].setPadding(8, 8, 8, 8); 72 group.addView(diandian[i]); 73 } 74 viewPager.setAdapter(new GuideAdapter()); 75 // 設置監聽,主要是設置點點的背景 76 viewPager.setOnPageChangeListener(new GuidePagerListener()); 77 // 設置ViewPager的默認項,設置為長度的1000倍,這樣開始就能向左滑動了 78 viewPager.setCurrentItem((images.length) * 1000); 79 } 80 81 /** 82 * 每次當onResume有焦點時發送個空消息開始輪播 83 */ 84 @Override 85 protected void onResume() { 86 // TODO Auto-generated method stub 87 super.onResume(); 88 mHandler.sendEmptyMessageDelayed(0, 2000); 89 } 90 91 /** 92 * 當暫停時停止輪播 93 */ 94 @Override 95 protected void onPause() { 96 // TODO Auto-generated method stub 97 super.onPause(); 98 mHandler.removeCallbacksAndMessages(null); 99 } 100 101 /** 102 * ViewPager的適配器 103 * 104 */ 105 private class GuideAdapter extends PagerAdapter { 106 107 @Override 108 public int getCount() { 109 // TODO Auto-generated method stub 110 return Integer.MAX_VALUE; 111 } 112 113 @Override 114 public boolean isViewFromObject(View arg0, Object arg1) { 115 // TODO Auto-generated method stub 116 return arg0 == arg1; 117 } 118 119 // @Override 120 // public void destroyItem(View container, int position, Object object) 121 // { 122 // // TODO Auto-generated method stub 123 // ((ViewGroup) container).removeView(images[position 124 // % images.length]); 125 // } 126 @Override 127 public void destroyItem(ViewGroup container, int position, Object object) { 128 // TODO Auto-generated method stub 129 container.removeView((View) object); 130 } 131 132 /** 133 * 加載圖片進去,用當前的position除以圖片數組長度取余數是關鍵 134 */ 135 @Override 136 public Object instantiateItem(ViewGroup container, int position) { 137 // TODO Auto-generated method stub 138 final int currentIten = position % images.length; 139 ImageView iView = mImageViewList.get(currentIten); 140 try { 141 142 if (iView.getParent() == null) { 143 container.addView(iView); 144 } 145 iView.setOnClickListener(new OnClickListener() { 146 147 @Override 148 public void onClick(View arg0) { 149 // TODO Auto-generated method stub 150 DensityUtil.showToast(MActivity_Luenbo.this, 151 currentIten + ""); 152 } 153 }); 154 iView.setOnTouchListener(new NewTouchListener()); 155 } catch (Exception e) { 156 // TODO: handle exception 157 } 158 159 return iView; 160 } 161 162 } 163 164 /** 165 * ViewPager 的滑動監聽 166 * 167 * @author Administrator 168 * 169 */ 170 private class GuidePagerListener implements OnPageChangeListener { 171 172 @Override 173 public void onPageScrollStateChanged(int arg0) { 174 // TODO Auto-generated method stub 175 176 } 177 178 @Override 179 public void onPageScrolled(int arg0, float arg1, int arg2) { 180 // TODO Auto-generated method stub 181 System.out.println(arg0 + " dd " + arg1 + " dddd " + arg2); 182 } 183 184 @Override 185 public void onPageSelected(int position) { 186 // TODO Auto-generated method stub 187 selectedItem = position; 188 System.out.println("第幾個頁面" + position + " " + position 189 % mImageViewList.size()); 190 for (int i = 0; i < diandian.length; i++) { 191 if (i == position % images.length) { 192 diandian[i] 193 .setImageResource(R.drawable.page_indicator_focused); 194 } else { 195 diandian[i] 196 .setImageResource(R.drawable.page_indicator_unfocused); 197 } 198 } 199 } 200 201 } 202 203 /** 204 * ViewPager的觸摸事件當按下圖片停止輪播 205 * 206 * @author Administrator 207 * 208 */ 209 private class NewTouchListener implements OnTouchListener { 210 211 @Override 212 public boolean onTouch(View arg0, MotionEvent arg1) { 213 // TODO Auto-generated method stub 214 switch (arg1.getAction()) { 215 case MotionEvent.ACTION_DOWN: 216 mHandler.removeCallbacksAndMessages(null); 217 break; 218 case MotionEvent.ACTION_CANCEL: 219 mHandler.sendEmptyMessageDelayed(0, 3000); 220 break; 221 case MotionEvent.ACTION_UP: 222 mHandler.sendEmptyMessageDelayed(0, 3000); 223 break; 224 default: 225 break; 226 } 227 return true; 228 } 229 230 } 231 232 }
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:orientation="vertical" > 6 7 <TextView 8 android:layout_width="match_parent" 9 android:layout_height="wrap_content" 10 android:padding="10dp" 11 android:text="@string/luenbo" 12 android:textColor="#f00" /> 13 14 <FrameLayout 15 android:layout_width="match_parent" 16 android:layout_height="200dp" > 17 18 <android.support.v4.view.ViewPager 19 android:id="@+id/vp_viewPager" 20 android:layout_width="match_parent" 21 android:layout_height="match_parent" /> 22 23 <RelativeLayout 24 android:layout_width="wrap_content" 25 android:layout_height="wrap_content" 26 android:layout_gravity="bottom|center" 27 android:layout_marginBottom="20dp" > 28 29 <LinearLayout 30 android:id="@+id/ll_viewGroup" 31 android:layout_width="wrap_content" 32 android:layout_height="wrap_content" 33 android:orientation="horizontal" /> 34 </RelativeLayout> 35 36 </FrameLayout> 37 38 </LinearLayout>
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