Android 自定义View添加回调

来源：互联网发布：历史虚无主义表现知乎编辑：程序博客网时间：2024/06/01 08:00
Android中回调的应用场景很多，自定义View中监听Edittext输入字符便是其中一种。闲话少叙，直接上代码：
1、自定义View
public class SearchLayout extends FrameLayout {    private TextView search_close_btn;    private EditText search_text;    // 回调接口    private ICallBack mCallBack;// 搜索按键回调接口    public SearchLayout(Context context) {        this(context,null);    }    public SearchLayout(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public SearchLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        LayoutInflater inflater = LayoutInflater.from(context);        View view = inflater.inflate(R.layout.search_view_layout, this);        search_close_btn = (TextView) view.findViewById(R.id.search_close_btn);        search_close_btn.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                search_text.setText("");                KeybordUtil.closeKeybord(search_text,getContext());                if(search_close_btn.getVisibility()==VISIBLE){                    search_close_btn.setVisibility(GONE);                }            }        });        search_text = (EditText) view.findViewById(R.id.search_text);        search_text.setImeOptions(EditorInfo.IME_ACTION_SEARCH);        search_text.setInputType(EditorInfo.TYPE_CLASS_TEXT);        search_text.setOnEditorActionListener(new TextView.OnEditorActionListener() {            @Override            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {                if (actionId== EditorInfo.IME_ACTION_SEND ||(event!=null&&event.getKeyCode()== KeyEvent.KEYCODE_ENTER)) {                    ToastUtil.makeText(getContext(),"搜索："+search_text.getText());                    KeybordUtil.closeKeybord(search_text,getContext());                    return true;                }                return false;            }        });        search_text.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {                if(!TextUtils.isEmpty(search_text.getText())&&search_close_btn.getVisibility()==GONE){                    search_close_btn.setVisibility(VISIBLE);                }            }            @Override            public void afterTextChanged(Editable s) {                if (!(mCallBack == null)){                    mCallBack.SearchAciton(search_text.getText().toString());                }                if(TextUtils.isEmpty(search_text.getText())){                    search_close_btn.setVisibility(GONE);                }            }        });    }    /**     * 点击键盘中搜索键后的操作，用于接口回调     */    public void setOnClickSearch(ICallBack mCallBack){        this.mCallBack = mCallBack;    }    public interface ICallBack {        void SearchAciton(String string);    }}2、布局中引入自定义View：<com.humorboy.view.SearchLayout    android:id="@+id/searchView"    android:layout_below="@+id/custom_actionbar"    android:layout_width="match_parent"    android:layout_height="wrap_content"/>

3、在Activity中监听：

searchView = (SearchLayout) findViewById(R.id.searchView);searchView.setOnClickSearch(new SearchLayout.ICallBack() {    @Override    public void SearchAciton(String string) {        ToastUtil.makeText(AutoComeActivity.this,""+string);    }});
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