2023學(xué)年完整公開課版單擊事件OnClick

《通信業(yè)務(wù)開發(fā)》課程單擊OnClick單擊事件OnClick事件特性監(jiān)聽接口PART18-2實(shí)例演示事件特性示例View控件最常見事件接口：View.OnClickListener.OnClick()屬性標(biāo)簽：OnClick實(shí)現(xiàn)步驟：獲取監(jiān)聽對(duì)象（ButtonEditText...）創(chuàng)建監(jiān)聽器類,實(shí)現(xiàn)OnClickListener注冊(cè)監(jiān)聽器：setOnClickListener()規(guī)則監(jiān)聽接口publicstaticinterfaceView.OnClickListener{ publicvoidonClick(Viewv);}voidsetOnClickListener(View.OnClickListener

l)實(shí)例演示publicclassMainAcextendsActivity{EditTextedit1,edit2,edit3;Buttonbtn1;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);

edit1=(EditText)findViewById(R.id.editText1);edit2=(EditText)findViewById(R.id.editText2);edit3=(EditText)findViewById(R.id.editText3);btn1=(Button)findViewById(R.id.button1);

OnBtn1ClickbtnListener=newOnBtn1Click();OnBtn1btn1.setOnClickListener(btnListener);

}

//內(nèi)部監(jiān)聽類classOnBtn1ClickimplementsOnClickListener{@OverridepublicvoidonClick(Viewv){intnum1=Integer.parseInt(edit1.getText().toString());intnum2=Integer.parseInt(edit2.getText().toString());

intresult=num1+num2;edit3.setText(Integer.toString(result));}}}點(diǎn)擊監(jiān)聽實(shí)現(xiàn)1內(nèi)部監(jiān)聽類publicclassMainAcextendsActivity{EditTextedit1,edit2,edit3;Buttonbtn1;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);

edit1=(EditText)findViewById(R.id.editText1);edit2=(EditText)findViewById(R.id.editText2);edit3=(EditText)findViewById(R.id.editText3);btn1=(Button)findViewById(R.id.button1);

//匿名內(nèi)部類OnBtn1btn1.setOnClickListener(newOnClickListener(){@OverridepublicvoidonClick(Viewv){

intnum1=Integer.parseInt(edit1.getText().toString());intnum2=Integer.parseInt(edit2.getText().toString());

intresult=num1+num2;edit3.setText(Integer.toString(result));}});

}}點(diǎn)擊監(jiān)聽實(shí)現(xiàn)2匿名內(nèi)部類實(shí)例演示publicclassMainAcextendsActivityimplementsOnClickListener{EditTextedit1,edit2,edit3;Buttonbtn1;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);

edit1=(EditText)findViewById(R.id.editText1);edit2=(EditText)findViewById(R.id.editText2);edit3=(EditText)findViewById(R.id.editText3);btn1=(Button)findViewById(R.id.button1);

OnBtn1btn1.setOnClickListener(this);

}

//Activity實(shí)現(xiàn)OnClickListener接口，成為監(jiān)聽器

@Override

publicvoidonClick(Viewv){if(v.getId()==R.id.button1){intnum1=Integer.parseInt(edit1.getText().toString());intnum2=Integer.parseInt(edit2.getText().toString());intresult=num1+num2;edit3.setText(Integer.toString(result));}}}點(diǎn)擊監(jiān)聽實(shí)現(xiàn)3Activity監(jiān)聽實(shí)例演示<EditTextandroid:id="@+id/editText1"android:layout_width="wrap_content"android:layout_height="wrap_content”/><TextViewandroid:id="@+id/textView1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="+”/><EditTextandroid:id="@+id/editText2"android:layout_width="wrap_content"android:layout_height="wrap_content“/><Buttonandroid:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="="

android:onClick="OnbtnCalculate“/><EditTextandroid:id="@+id/editText3"android:layout_height="wrap_content"android:layout_width="wrap_content"android:editable="false“/>XML布局main.xmlpublicclassMainAcextendsActivity{EditTextedit1,edit2,edit3;Buttonbtn1;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);

edit1=(EditText)findViewById(R.id.editText1);edit2=(EditText)findViewById(R.id.editText2);edit3=(EditText)findViewById(R.id.editText3);btn1=(Button)findViewById(R.id.button1);

}

publicvoidOnbtnCalculate(Viewview)