XML文件

<EditText  
    android:layout_width="match_parent"  
    android:layout_height="wrap_content"  
    android:inputType="phone"  
    android:ems="10"  
    android:id="@+id/et_number"  
    android:layout_alignParentTop="true"  
    android:layout_alignParentLeft="true"  
    android:layout_alignParentStart
 
="true" />  
  
<Button  
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"  
    android:text="@string/dial_number"  
    android:id="@+id/bt_dial"  
    android:layout_below="@id/et_number"  
    android:layout_alignRight="@id/et_number"  
    android:layout_alignEnd
 
="@id/et_number" />  

第一種、匿名內部類：

protected void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.activity_main);  
    Button bt_dial = (Button) findViewById(R.id.bt_dial);  
    bt_dial.setOnClickListener(new View.OnClickListener() {  
        @Override  
        public void onClick(View view) {  
            dialPhone();  
        }  
    });  
}  

　　第二種、自定義單擊事件監聽類：

protected void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        et_number = (EditText) MainActivity.this.findViewById(R.id.et_number);  
                      
        Button bt_dial = (Button) findViewById(R.id.bt_dial);  
        bt_dial.setOnClickListener(new MyListener());  
    }  
  
    private class MyListener implements View.OnClickListener {  
    @Override  
    public void onClick(View view) {  
        dialPhone();  
    }  
}  

　　第三種、Activity繼承View.OnClickListener，由Activity實現OnClick(View view)方法，在OnClick(View view)方法中用switch-case對不同id代表的button進行相應的處理：

public class MainActivity extends Activity implements View.OnClickListener {  
    EditText et_number;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        et_number = (EditText) MainActivity.this.findViewById(R.id.et_number);  
          
    Button bt_dial = (Button) findViewById(R.id.bt_dial);  
        bt_dial.setOnClickListener(this);  
  
    }  
  
    public void onClick(View view) {  
  
        switch (view.getId()){  
            case R.id.bt_dial:  
                dialPhone();  
                break;  
            default:  
                break;  
        }  
    }  
}  

　　第四種、在XML文件中顯示指定按鈕的onClick屬性，這樣點擊按鈕時會利用反射的方式調用對應Activity中的click()方法：

<Button  
        android:onClick="dialPhoneMethod"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="@string/dial_number"  
        android:id="@+id/bt_dial"  
        android:layout_below="@id/et_number"  
        android:layout_alignRight="@id/et_number"  
        android:layout_alignEnd="@id/et_number" />  

public void dialPhoneMethod(View view){  
    dialPhone();  
}  
  
private void dialPhone() {  
    String number = et_number.getText().toString().trim();  
  
    if (TextUtils.isEmpty(number)){  
        Toast.makeText(this, "電話號碼不能為空", Toast.LENGTH_LONG).show();  
        return;  
    }  
    Intent intent = new Intent();  
    intent.setAction(Intent.ACTION_CALL);  
    intent.setData(Uri.parse("tel:" + number));  
    startActivity(intent);  
}  

Android onClick 按鈕單擊事件 四種常用寫法