Android实现登录邮箱的自动补全功能

public class AutoComplete extends AutoCompleteTextView {  private static final String[] emailSuffix = {    "@qq.com", "@163.com", "@126.com", "@gmail.com", "@sina.com", "@hotmail.com",    "@yahoo.cn", "@sohu.com", "@foxmail.com", "@139.com", "@yeah.net", "@vip.qq.com",    "@vip.sina.com"};  ......省略号......  //构造函数原型要正确，留给系统调用  public AutoComplete(Context context) {    super(context);    mContext = context;  }  public AutoComplete(Context context, AttributeSet attrs) {    super(context, attrs);    mContext = context;  }  public void init(ImageView imageView) {    mImageView = imageView;    final MyAdatper adapter = new MyAdatper(mContext);    setAdapter(adapter);    addTextChangedListener(new TextWatcher() {      @Override      public void afterTextChanged(Editable s) {        if (isTextWatch) {          String input = s.toString();          ......省略号......          adapter.clearList(); //注意要清空数据，根据输入的变化，自动生成数据          if (input.length() > 0) {            for (int i = 0; i < emailSuffix.length; ++i) {              adapter.addListData(input + emailSuffix[i]);            }          }          adapter.notifyDataSetChanged();          showDropDown();//该行代码会造成崩溃        }      }    });    //当输入一个字符的时候就开始检测    setThreshold(1);  }  private class ViewHolder {    TextView tv_Text;  }  class MyAdatper extends BaseAdapter implements Filterable {    private List<String> mList;    private Context mContext;    private MyFilter mFilter;    ......省略号......    public void clearList() {      mList.clear();    }    public void addListData(String strData) {      mList.add(strData);    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {      View view;      ViewHolder viewHolder;      if (convertView == null) {        view = LayoutInflater.from(mContext).inflate(R.layout.activity_autocomplete_item, null);        viewHolder = new ViewHolder();        viewHolder.tv_Text = (TextView) view.findViewById(R.id.tv_autocomplete);        view.setTag(viewHolder);      } else {        view = convertView;        viewHolder = (ViewHolder) view.getTag();      }      viewHolder.tv_Text.setText(mList.get(position));      return view;    }    ......省略号......  }

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:background="@color/White"  android:layout_height="wrap_content">  <TextView    android:id="@+id/tv_autocomplete"    android:padding="15dp"    android:textSize="20sp"    android:singleLine="true"    android:textColor="@color/Black"    android:layout_width="match_parent"    android:layout_height="wrap_content" /></LinearLayout>

public class AdvancedAutoCompleteTextView extends RelativeLayout {  private Context mContext;  private AutoComplete mAutoComplete; //上面的自定义控件  private ImageView mImageView;    //右侧的图标控件  ......省略号......  @Override  protected void onFinishInflate() {    super.onFinishInflate();    initViews();  }  //代码方式，初始化布局  private void initViews() {    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);    params.addRule(RelativeLayout.ALIGN_PARENT_LEFT);    params.addRule(RelativeLayout.CENTER_VERTICAL);    mAutoComplete = new AutoComplete(mContext);    mAutoComplete.setLayoutParams(params);    mAutoComplete.setPadding(0, 0, 40, 0);    mAutoComplete.setSingleLine(true);    mAutoComplete.setInputType(InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS);    mAutoComplete.setFitsSystemWindows(true);    mAutoComplete.setEms(10);    mAutoComplete.setHint("URS账号");    mAutoComplete.setImeOptions(EditorInfo.IME_ACTION_NEXT                | EditorInfo.IME_FLAG_NO_EXTRACT_UI | EditorInfo.IME_FLAG_NO_FULLSCREEN);    mAutoComplete.setDropDownHorizontalOffset(0);    mAutoComplete.setDropDownVerticalOffset(2);    mAutoComplete.setBackgroundResource(R.drawable.edit_text_background);    RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT);    p.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);    p.addRule(RelativeLayout.CENTER_VERTICAL);    p.rightMargin = 10;    mImageView = new ImageView(mContext);    mImageView.setLayoutParams(p);    mImageView.setScaleType(ImageView.ScaleType.FIT_CENTER);    mImageView.setImageResource(R.drawable.unselect);    mImageView.setClickable(true);    mImageView.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        setText("");      }    });    this.addView(mAutoComplete);    this.addView(mImageView);    //监听获取焦点事件，目的：输入帐号时，右侧图标的显示    mAutoComplete.setOnFocusChangeListener(new OnFocusChangeListener() {      @Override      public void onFocusChange(View v, boolean hasFocus) {        if (hasFocus && !mAutoComplete.getText().toString().isEmpty()) {          mAutoComplete.setShow(false); //如果获取首次获取焦点，此时文本不为空，则显示，并禁止文本改变监听里的设置          mImageView.setImageResource(R.drawable.item_delete);        } else if (hasFocus) {          mAutoComplete.setShow(true);//如果获取首次获取焦点，此时文本为空，则不改变，并开启文本改变监听里的设置        } else {          mAutoComplete.setShow(false);          mImageView.setImageResource(R.drawable.unselect);        }      }    });         //对AutoComplete自定义控件初始化，一定要放到最后.否则，会由于AutoComplete初始化未完成,就弹窗，而崩溃    mAutoComplete.init(mImageView);   }}