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android基于监听的事件处理
android利用监听器来实现事件处理，有多种方法：
//以下下import 包部分省略，复制时请自行导入
Activity本身作为事件监听器
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.testevent.MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:text="Button" /> </RelativeLayout>
MainActivity.java
public class MainActivity extends Activity implements OnClickListener{
TextView textView;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView1);
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(this);
}
@Override
public void onClick(View v) {
textView.setText("我被点击了");
}
}
2.匿名内部类作为事件监听器
xml文件同上
MainActivity.java
public class MainActivity extends Activity {
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) {
TextView textView = (TextView) findViewById(R.id.textView1);
textView.setText("我被点击了");
}
});
}
}
3.定义外部类作为事件监听器
xml文件同上
MainActivity.java
public class MainActivity extends Activity {
TextView textView;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView)findViewById(R.id.textView1);
button = (Button) findViewById(R.id.button1);
button.setOnLongClickListener(new TextChangeListener(this, textView));
}
}
TextChangeListener.java
public class TextChangeListener implements OnLongClickListener {
TextView textView;
public TextChangeListener(Activity ac, TextView textView) {
this.textView = textView;
}
@Override
public boolean onLongClick(View v) {
textView.setText("我被长时间点击了");
return true;
}
}
4.将事件监听器直接绑定到标签
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.testevent.MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:onClick="buttonClickHandle" android:text="Button" /> </RelativeLayout>
MainActivity.java
public class MainActivity extends Activity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
//此处必须是public
public void buttonClickHandle(View v){
textView = (TextView)findViewById(R.id.textView1);
textView.setText("我被点击了");
}
}
android基于监听的事件处理
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