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//Mybutton.java
package com.home.lemon.callbackhandler;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Button;
import android.widget.TextView;
import org.w3c.dom.Text;
/**
* Created by think on 2017/8/29.
*/
public class MyButton extends android.support.v7.widget.AppCompatButton {
public MyButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
super.onKeyDown(keyCode,event);
Log.v("com.home.lemon","the onKeyDown in MyButton");
return false;
}
}
//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!--使用自定义的View时应使用全限定类名-->
<com.home.lemon.callbackhandler.MyButton
android:id="@+id/bn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Click me"/>
</LinearLayout>
//MainActivity.java
package com.home.lemon.callbackhandler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.v("com.home.lemon","MyButton onCreate");
}
}