ButterKnife你需要知道的点

ButterKnife&＃xff0c;这个方便findViewById而使用的库&＃xff0c;无数的应用在使用它&＃xff0c;以注解来实现的他&＃xff0c;对应用的性能影响几乎可以忽略&＃xff0c;可以放心使用。

使用&＃xff1a;

compile &＃39;com.jakewharton:butterknife:7.0.1&＃39;

我们常用的无非就是&＃xff1a;

&＃64;Bind(R.id.name) View name&＃64;OnClick(R.id.name) public void click(){}

其实他的功能远不仅仅如此&＃xff0c;常用的还有下面点是你需要知道的。

1.对多个view的点击事件监听&＃xff1a;

&＃64;OnClick({ R.id.button1, R.id.button2, R.id.button2 }) public void buttonClicks(View view) {switch(view.getId()) {case R.id.button1:Toast.makeText(this, "Button1 clicked!", LENGTH_SHORT).show();break;case R.id.button1:Toast.makeText(this, "Button2 Clicked!", LENGTH_SHORT).show(); break;case R.id.button1:Toast.makeText(this, "Button3 clicked!", LENGTH_SHORT).show();break;} }

2.长按以及选中Item等的监听&＃xff1a;

&＃64;OnLongClick(R.id.hello) boolean sayGetOffMe() {Toast.makeText(this, "Let go of me!", LENGTH_SHORT).show();return true;}&＃64;OnItemClick(R.id.list_of_things) void onItemClick(int position) {Toast.makeText(this, "You clicked: " &＃43; adapter.getItem(position), LENGTH_SHORT).show();}&＃64;OnItemSelected({R.id.spinnerCountry}) void onItemSelected(Spinner spinner, int position) { } &＃64;OnItemSelected(value&＃61;R.id.spinnerCountry, callback &＃61; OnItemSelected.Callback.NOTHING_SELECTED) void onNothingSelected() { } ***** &＃64;OnLongClick &＃64;OnPageChange OnPageChange.Callback &＃64;OnTextChanged &＃64;OnTextChanged.Callback &＃64;OnTouch &＃64;OnItemLongClick &＃64;OnCheckedChanged

3.绑定资源文件&＃xff0c;也可以这样玩&＃xff1a;

&＃64;BindColor(R.color.red) int red; &＃64;BindString(R.string.activity_title) String activityTitle;&＃64;BindDimen(R.dimen.btn_horizontal_margin_common) Float btnHorizontalMarginCommon;&＃64;BindDrawable(R.drawable.ic_instructions) Drawable iconInstructions;

4.绑定多个view到List:

Bind({ R.id.first_name, R.id.middle_name, R.id.last_name }) List nameViews;

ButterKnife.apply(nameViews, DISABLE); ButterKnife.apply(nameViews, ENABLED, false);static final ButterKnife.Action DISABLE &＃61; new ButterKnife.Action() {&＃64;Override public void apply(View view, int index) {view.setEnabled(false);} };static final ButterKnife.Setter ENABLED &＃61; new ButterKnife.Setter() {&＃64;Override public void set(View view, Boolean value, int index) {view.setEnabled(value);} };

5.设置View的属性&＃xff1a;

ButterKnife.apply(nameViews, View.ALPHA, 0.0f);

6.如果对findViewById怀念&＃xff0c;你也可以这样玩&＃xff1a;

View view &＃61; LayoutInflater.from(context).inflate(R.layout.thing, null); TextView firstName &＃61; ButterKnife.findById(view, R.id.first_name); TextView lastName &＃61; ButterKnife.findById(view, R.id.last_name); ImageView photo &＃61; ButterKnife.findById(view, R.id.photo);

7.非空判断&＃xff0c;如果view为空会抛出异常&＃xff0c;但是你可以这样玩呀&＃xff1a;

&＃64;Nullable &＃64;Bind(R.id.edUserName) EditText edUserName;