一、按钮触发事件写法一

  1. public class A extends AppCompatActivity {
  2.     @Override
  3.     protected void onCreate (Bundle saveInstanceState) {
  4.         super.onCreate(saveInstanceState);
  6.         Button button = findViewById(R.id.button);
  7.         button.setOnClickListener(new View.OnClickListener () {
  8.             @Override
  9.             public void onClick (View v) {
  10.                 // ....
  11.             }
  12.         });
  13.     }
  14. }

二、按钮触发事件写法二

  1. public class A extends AppCompatActivity implementes View.OnClickListener{
  2.     @Override
  3.     protected void onCreate (Bundle saveInstanceState) {
  4.         super.onCreate(saveInstanceState);
  6.         Button button = findViewById(R.id.button);
  7.         button.setOnClickListener(this);
  8.     }
  10.     @Override
  11.     public void onClick (View v) {
  12.         switch (v.getId()) {
  13.             case R.id.button:
  14.                 // ...
  15.                 break;
  16.             case R.id.button_2:
  17.                 // ...
  18.                 break;
  19.             default:
  20.         }
  21.     }
  22. }

三、设置按钮不可点击

  1. Button btn = findViewById(R.id.btn);
  2. btn.setEnabled(false);        // false 不可点击，默认 true 可点击