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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");
}
});
}
}
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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");
}
}
}
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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");
}
}
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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");
}
}
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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");
}
}