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今天就跟大家聊聊有關Android中怎么實現一個圖片輪播列表,可能很多人都不太了解,為了讓大家更加了解,小編給大家總結了以下內容,希望大家根據這篇文章可以有所收獲。
布局文件代碼:
<?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"> <include layout="@layout/title_bar"/><ScrollView android:layout_width="match_parent" android:id="@+id/sv" android:layout_height="0dp" android:layout_weight="1"><LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <android.support.v4.view.ViewPager android:id="@+id/vp" android:layout_width="match_parent" android:layout_height="200dp"/> <LinearLayout android:id="@+id/ivs" android:layout_width="match_parent" android:layout_height="60dp" android:layout_margin="10dp" android:orientation="horizontal"> <ImageView android:id="@+id/iv1" android:layout_weight="1" android:layout_marginStart="30dp" android:layout_width="60dp" android:layout_height="60dp" android:src="@drawable/index_icon"/> <ImageView android:id="@+id/iv2" android:layout_weight="1" android:layout_width="60dp" android:layout_height="60dp" android:src="@drawable/index_icon"/> <ImageView android:id="@+id/iv3" android:layout_weight="1" android:layout_width="60dp" android:layout_height="60dp" android:src="@drawable/index_icon"/> <ImageView android:id="@+id/iv4" android:layout_weight="1" android:layout_marginEnd="30dp" android:layout_width="60dp" android:layout_height="60dp" android:src="@drawable/index_icon"/> </LinearLayout> <com.oridway.www.uiframe.utils.ListViewForScrollView android:id="@+id/lvfsv" android:layout_width="match_parent" android:layout_height="wrap_content"/></LinearLayout></ScrollView> <LinearLayout android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:orientation="horizontal"> <TextView android:id="@+id/index" android:layout_width="60dp" android:layout_height="wrap_content" android:drawableTop="@drawable/ic_home_black_24dp" android:gravity="center" android:text="首頁" android:textColor="@color/black" /> <TextView android:id="@+id/message" android:layout_width="60dp" android:layout_height="wrap_content" android:drawableTop="@drawable/ic_message_black_24dp" android:gravity="center" android:text="消息" android:textColor="@color/black" /> <TextView android:id="@+id/community" android:layout_width="60dp" android:layout_height="wrap_content" android:drawableTop="@drawable/ic_people_black_24dp" android:gravity="center" android:text="社區" android:textColor="@color/black" /> <TextView android:id="@+id/self" android:layout_width="60dp" android:layout_height="wrap_content" android:drawableTop="@drawable/ic_person_black_24dp" android:gravity="center" android:text="我" android:textColor="@color/black" /> </LinearLayout></LinearLayout>
主窗口代碼:
public class IndexActivity extends AppCompatActivity implements View.OnClickListener{ private Context mContext; private List<Integer> mImageList; private List<Candidate> mCandidateList; private ViewPagerAdapter mPagerAdapter; private CandidateListAdapter mListAdapter; @SuppressLint("HandlerLeak") private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { //每次將當前的位置加1,也就是向右滑動一次 vp.setCurrentItem(vp.getCurrentItem() + 1); //遞歸無限循環調用 handler.sendEmptyMessageDelayed(0x123, 2000); } }; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_index); ButterKnife.bind(this); initData(); initView(); intListener(); } //初始化數據源,固定寫法 1.實例化容器 2.實例化適配器 3.設置適配器 private void initData() { mContext = this; mImageList = new ArrayList<>(); mCandidateList = new ArrayList<>(); mListAdapter = new CandidateListAdapter(mCandidateList); mPagerAdapter = new ViewPagerAdapter(mImageList); lvfsv.setAdapter(mListAdapter); vp.setAdapter(mPagerAdapter); getListData(10); getPagerData(); //間隔2秒發送一次信息 handler.sendEmptyMessageDelayed(0x123, 2000); } //生成ViewPager數據源 private void getPagerData() { mImageList.add(R.drawable.bm1); mImageList.add(R.drawable.bm2); mImageList.add(R.drawable.bm3); mImageList.add(R.drawable.bm4); mImageList.add(R.drawable.bm5); mImageList.add(R.drawable.bm6); mPagerAdapter.notifyDataSetChanged(); //初始的位置在正中間 vp.setCurrentItem(mPagerAdapter.getCount() / 2); } //生成ListView數據源 private void getListData(int num) { for (int i = 0; i < num; i++) { Candidate candidate = new Candidate(); candidate.setName("姓名:尼爾斯·亨利克·戴維·玻爾"); candidate.setInfo("職業:學者,物理學家,足球運動員"); candidate.setTrait("成就:哥本哈根學派的創始人,1922年獲得諾貝爾物理學獎"); mCandidateList.add(candidate); } mListAdapter.notifyDataSetChanged(); } private void initView() { tvTitleMiddle.setText("輪播列表"); //手動設置ScrollView的位置 scrollView.smoothScrollTo(0, 0); } //初始化監聽 private void intListener() { mPagerAdapter.setmCallback((v, position) -> { Toast.makeText(mContext, "position: " + position, Toast.LENGTH_SHORT).show(); }); lvfsv.setOnItemClickListener((parent, view, position, id) -> { Toast.makeText(mContext, "position: " + position, Toast.LENGTH_SHORT).show(); }); for (int i = 0; i < 4; i++) { ivs.getChildAt(i).setOnClickListener(this); } } @Override public void onClick(View v) { switch (v.getId()){ case R.id.iv1: case R.id.iv2: case R.id.iv3: case R.id.iv4: Toast.makeText(mContext, "此處跳轉", Toast.LENGTH_SHORT).show(); } }}
ListView需要覆蓋onMeasure方法,代碼如下:
public class ListViewForScrollView extends ListView { public ListViewForScrollView(Context context) { super(context); } public ListViewForScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public ListViewForScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override /** * 重寫該方法,達到使ListView適應ScrollView的效果 */ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); }}
ViewPager適配器代碼:
public class ViewPagerAdapter extends PagerAdapter implements View.OnClickListener { //圖片的資源id列表 private List<Integer> mList; private Callback mCallback; public ViewPagerAdapter(List<Integer> mList) { this.mList = mList; } public void setmCallback(Callback mCallback) { this.mCallback = mCallback; } public interface Callback { void onClick(View v, int position); } @Override //將適配器中的數據設為無窮大 public int getCount() { return Integer.MAX_VALUE; } @Override //固定寫法,不覆蓋會報錯 public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) { container.removeView((View) object); } @Override //固定寫法 public boolean isViewFromObject(@NonNull View view, @NonNull Object object) { return view == object; } @NonNull @Override public Object instantiateItem(@NonNull ViewGroup container, int position) { LayoutInflater inflater = LayoutInflater.from(container.getContext()); ImageView imageView = (ImageView) inflater.inflate(R.layout.item_image_pager, null); //將position轉換成余數 int realPosition = position % mList.size(); imageView.setImageResource(mList.get(realPosition)); imageView.setOnClickListener(this); //tag放跳轉需要的數據 imageView.setTag(realPosition); //將實例加入父控件 container.addView(imageView); return imageView; } @Override //使用接口將position回傳 public void onClick(View v) { mCallback.onClick(v, (int) v.getTag()); }}
看完上述內容,你們對Android中怎么實現一個圖片輪播列表有進一步的了解嗎?如果還想了解更多知識或者相關內容,請關注億速云行業資訊頻道,感謝大家的支持。
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