本文實例為大家分享了Android登錄郵箱自動補全功能的實現方法，供大家參考，具體內容如下
效果：
實現原理：
1、繼承重寫簡單控件AutoCompleteTextView
2、編寫自定義數據適配器和布局文件，并實現文字變化監聽器
3、通過組合方式，實現右側的刪除圖標。并根據焦點和文字的變化，動態顯示右側刪除圖標。
1、通過繼承自簡單控件AutoCompleteTextView實現帳號自動補全
關鍵代碼：
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"}; ......省略號...... //構造函數原型要正確，留給系統調用 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(); ......省略號...... adapter.clearList(); //注意要清空數據，根據輸入的變化，自動生成數據 if (input.length() > 0) { for (int i = 0; i < emailSuffix.length; ++i) { adapter.addListData(input + emailSuffix[i]); } } adapter.notifyDataSetChanged(); showDropDown();//該行代碼會造成崩潰 } } }); //當輸入一個字符的時候就開始檢測 setThreshold(1); } private class ViewHolder { TextView tv_Text; } class MyAdatper extends BaseAdapter implements Filterable { private List<String> mList; private Context mContext; private MyFilter mFilter; ......省略號...... 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; } ......省略號...... }activity_autocomplete_item 下拉列表布局文件
<?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>
上面自動補全的效果圖：
2、通過組合方式實現帳號自動補全復雜控件
關鍵代碼：
public class AdvancedAutoCompleteTextView extends RelativeLayout { private Context mContext; private AutoComplete mAutoComplete; //上面的自定義控件 private ImageView mImageView; //右側的圖標控件 ......省略號...... @Override protected void onFinishInflate() { super.onFinishInflate(); initViews(); } //代碼方式，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賬號"); 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); //監聽獲取焦點事件，目的：輸入帳號時，右側圖標的顯示 mAutoComplete.setOnFocusChangeListener(new OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if (hasFocus && !mAutoComplete.getText().toString().isEmpty()) { mAutoComplete.setShow(false); //如果獲取首次獲取焦點，此時文本不為空，則顯示，并禁止文本改變監聽里的設置 mImageView.setImageResource(R.drawable.item_delete); } else if (hasFocus) { mAutoComplete.setShow(true);//如果獲取首次獲取焦點，此時文本為空，則不改變，并開啟文本改變監聽里的設置 } else { mAutoComplete.setShow(false); mImageView.setImageResource(R.drawable.unselect); } } }); //對AutoComplete自定義控件初始化，一定要放到最后.否則，會由于AutoComplete初始化未完成,就彈窗，而崩潰 mAutoComplete.init(mImageView); }}以上就是本文的全部內容，希望對大家的學習有所幫助。
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