Android仿微信通讯录滑动快速定位功能

概述先给大家展示下效果图：实现代码如下：下面简单说下实现原理。publicclassIndexBarextendsLinearLayoutimplementsView.OnTouchListener{

先给大家展示下效果图：

实现代码如下：

下面简单说下实现原理。

public class Indexbar extends linearLayout implements VIEw.OntouchListener {  private static final String[] INDEXES = new String[]{"#","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};  private static final int touchED_BACKGROUND_color = 0x40000000;  private OnIndexChangedListener mListener;  public voID setonIndexChangedListener(OnIndexChangedListener Listener) {    mListener = Listener;  }  public Indexbar(Context context) {    this(context,null);  }  public Indexbar(Context context,AttributeSet attrs) {    this(context,attrs,0);  }  public Indexbar(Context context,AttributeSet attrs,int defStyleAttr) {    super(context,defStyleAttr);    init(attrs);  }  private voID init(AttributeSet attrs) {    TypedArray ta = getContext().obtainStyledAttributes(attrs,R.styleable.Indexbar);    float indexTextSize = ta.getDimension(R.styleable.Indexbar_indexTextSize,Utils.sp2px(getContext(),12));    int indexTextcolor = ta.getcolor(R.styleable.Indexbar_indexTextcolor,0xFF616161);    ta.recycle();    setorIEntation(VERTICAL);    setontouchListener(this);    for (String index : INDEXES) {      TextVIEw text = new TextVIEw(getContext());      text.setText(index);      text.setTextSize(TypedValue.COMPLEX_UNIT_PX,indexTextSize);      text.setTextcolor(indexTextcolor);      text.setGravity(Gravity.CENTER);      linearLayout.LayoutParams params = new linearLayout.LayoutParams(VIEwGroup.LayoutParams.MATCH_PARENT,1);      text.setLayoutParams(params);      addVIEw(text);    }  }  @OverrIDe  public boolean ontouch(VIEw v,MotionEvent event) {    switch (event.getAction()) {      case MotionEvent.ACTION_DOWN:        setBackgroundcolor(touchED_BACKGROUND_color);        handle(v,event);        return true;      case MotionEvent.ACTION_MOVE:        handle(v,event);        return true;      case MotionEvent.ACTION_UP:        setBackgroundcolor(color.transparent);        handle(v,event);        return true;    }    return super.ontouchEvent(event);  }  private voID handle(VIEw v,MotionEvent event) {    int y = (int) event.getY();    int height = v.getHeight();    int position = INDEXES.length * y / height;    if (position < 0) {      position = 0;    } else if (position >= INDEXES.length) {      position = INDEXES.length - 1;    }    String index = INDEXES[position];    boolean showIndicator = event.getAction() != MotionEvent.ACTION_UP;    if (mListener != null) {      mListener.onIndexChanged(index,showIndicator);    }  }  public interface OnIndexChangedListener {    voID onIndexChanged(String index,boolean showIndicator);  }}

使用

public class CompanyActivity extends BaseActivity implements Indexbar.OnIndexChangedListener {  @Bind(R.ID.lv_company)  ListVIEw lvCompany;  @Bind(R.ID.ib_indicator)  Indexbar ibIndicator;  @Bind(R.ID.tv_indicator)  TextVIEw tvIndicator;  private List<CompanyEntity> mCompanyList = new ArrayList<>();  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_company);    // ...  }  @OverrIDe  public voID onIndexChanged(String index,boolean showIndicator) {    int position = -1;    for (CompanyEntity company : mCompanyList) {      if (TextUtils.equals(company.getname(),index)) {        position = mCompanyList.indexOf(company);        break;      }    }    if (position != -1) {      lvCompany.setSelection(position);    }    tvIndicator.setText(index);    tvIndicator.setVisibility(showIndicator ? VIEw.VISIBLE : VIEw.GONE);  }}

继承自linearLayout，添加了26个字母索引TextVIEw，当手指滑动时通知Activity更新界面。

核心是OntouchListener，手指滑动的时候根据当前Y坐标计算出手指所在的索引位置，要注意临界值。

以上所述是小编给大家介绍的AndroID仿微信通讯录滑动快速定位功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对编程小技巧网站的支持！

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