Android实现按钮单击的五种类方式

一）：匿名内部类

Button btnConfirm = (Button) findViewById(R.id.btnConfirm);
    btnConfirm.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Toast.makeText(MainActivity.this, "Hello world", 0).show();
    }  

二）：内部类

class ConfirmOnClickListener implements OnClickListener{

    @Override
    public void onClick(View v) {
        Toast.makeText(MainActivity.this, "Hello world", 0).show();
    }
}  
btnConfirm.setOnClickListener(new ConfirmOnClickListener());  

三）：Activity类实现OnclickListener接口

public class MainActivity extends Activity implements OnclickListener{
    @Override   
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button btnConfirm = (Button) findViewById(R.id.btnConfirm);
    btnConfirm.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Toast.makeText(MainActivity.this, "Hello World", 0).show();
    }
} 

当多个按钮的时候， 可以用switch来确定点击的按钮

public class MainActivity extends Activity implements OnclickListener{
    @Override   
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button btnConfirm = (Button) findViewById(R.id.btnConfirm);
    Button btnCancel = (Button) findViewById(R.id.btnConfirm);
    btnConfirm.setOnClickListener(this);
    btnCancel.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
    		case R.id.btnConfirm:
                Toast.makeText(this, "点击了确定按钮", 0).show();
    			break;
    		case R.id.btnCancel:
                Toast.makeText(this, "点击了取消按钮", 0).show();
    			break;		 
    		default:
    			break;
		}
    }
} 

四）：控件onClick属性设置单击事件

<Button 
    android:id="@+id/btnConfirm"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:onClick="confirmClick"
    android:text="@string/CONFIRM"/>  

MainAcvitity类添加:

public void confirmClick(View v){
       Toast.makeText(this, "点击了确定按钮", 0).show();
    }  

五）：外部类的实现