Android按钮单击事件的五种实现方式
匿名内部类作为事件监听器
public class MainActivity extends Activity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) findViewById(R.id.button1); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { System.out.println("匿名内部类作为事件监听器"); } }); } }
内部类作为事件监听器
public class MainActivity extends Activity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) findViewById(R.id.button1); button.setOnClickListener(new ButtonOnClickListener()); } class ButtonOnClickListener implements OnClickListener{ @Override public void onClick(View v) { System.out.println("内部类作为事件监听器"); } } }
Activity本身作为事件监听器
public class MainActivity extends Activity implements OnClickListener{ private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) findViewById(R.id.button1); button.setOnClickListener(this); } @Override public void onClick(View v) { System.out.println("Activity本身作为事件监听器"); } }
外部类作为事件监听器
public class MainActivity extends Activity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) findViewById(R.id.button1); button.setOnClickListener(new ButtonOnClickListener()); } } class ButtonOnClickListener implements OnClickListener { @Override public void onClick(View v) { System.out.println("外部类作为事件监听器"); } }
将事件处理方法直接绑定到标签
<Button android:id="@ id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="点击事件" android:onClick="onClick" />
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void onClick(View v){ System.out.println("将事件处理方法直接绑定到标签"); } }
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