自定义带提示的文本输入框

Android自带AutoCompleteTextView，功能是在输入的是否完成提示功能，需要根据输入内容进行提示，空内容没有提示。

在项目中不满足需求，要求需要类似于可输入内容的下拉框。根据AutoCompleteTextView源码进行自定义实现功能。

代码：

/** * 带自动提示功能的EditText */public class MyEditText extends EditText{    public ListPopupWindow mPopupWindow;//提示框    private ArrayAdapter arrayAdapter;//适配器    public MyEditText(Context context) {        super(context);        initView(context);    }    public MyEditText(Context context, AttributeSet attrs) {        super(context, attrs);        initView(context);    }    private void initView(final Context context){        mPopupWindow=new ListPopupWindow(context);        mPopupWindow.setAnchorView(this); //附着的View        mPopupWindow.setVerticalOffset((int) getResources().getDimension(R.dimen.DIMEN_30PX)); //相对于父控件的垂直位置        mPopupWindow.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                if(arrayAdapter!=null) {                    MyEditText.this.setText(arrayAdapter.getItem(position));                }                mPopupWindow.dismiss();            }        });        mPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                clearFocusable(MyEditText.this);            }        });        this.addTextChangedListener(new TextWatcher() {            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {                    if (start + after > MyEditText.this.getMaxEms()) {                        ToastUtil.showToast(context, "最多可输入"+MyEditText.this.getMaxEms()+"个字符");                    }                }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override            public void afterTextChanged(Editable s) {                if(TextUtils.isEmpty(s)) {                    mPopupWindow.show();                }else{                    mPopupWindow.dismiss();                    getFocusable(MyEditText.this);                }            }        });        this.setOnFocusChangeListener(new OnFocusChangeListener() {            @Override            public void onFocusChange(View v, boolean hasFocus) {                EditText view = (EditText) v;                if (hasFocus&&TextUtils.isEmpty(view.getText())) {                    mPopupWindow.show();                }            }        });    }    //设置适配器    public void setArrayAdapter(ArrayAdapter arrayAdapter){        this.arrayAdapter=arrayAdapter;        mPopupWindow.setAdapter(arrayAdapter);    }    //清除控件焦点    private void clearFocusable(View view){        view.setFocusableInTouchMode(false);        view.clearFocus();        view.setFocusableInTouchMode(true);    }    //设置控件获取焦点    private void getFocusable(EditText view){        view.setFocusable(true);        view.setFocusableInTouchMode(true);        view.requestFocus();        view.setSelection(view.getText().length());    }}

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