Onkeydown in Android custom view does not respond

I wrote a custom view, which uses handler for a loop. in the loop process, how can I click the Left or Right key to make a response?
The result I want is: Print begin and handler cyclically. When the left and right keys are pressed, print: left and right.
I have attached my project.
Ask the brothers to point out the cause and give a solution
The following is my code:

Testhandler is an activity.

package cn.com.android;import android.app.Activity;import android.os.Bundle;public class TestHandler extends Activity {private ManTest test;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                test = (ManTest) findViewById(R.id.manTest);        test.begin();    }}

This is a custom view.

package cn.com.android;import android.content.Context;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.KeyEvent;import android.view.View;public class ManTest extends View{public ManTest(Context context, AttributeSet attrs) {super(context, attrs);}public ManTest(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if(keyCode ==KeyEvent.KEYCODE_DPAD_LEFT){System.out.println("KEY------>   Left");}if(keyCode ==KeyEvent.KEYCODE_DPAD_RIGHT){System.out.println("KEY------>   Right");}return super.onKeyDown(keyCode, event);}private RefreshHandler handler = new RefreshHandler();class RefreshHandler extends Handler {        @Override        public void handleMessage(Message msg) {        System.out.println("Handler");            begin();            ManTest.this.invalidate();        }        public void sleep(long delayMillis) {        this.removeMessages(0);            sendMessageDelayed(obtainMessage(0), delayMillis);        }    };public void begin(){System.out.println("Begin");handler.sleep(1000);}}

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="fill_parent"    android:layout_height="fill_parent"    ><cn.com.android.ManTest android:id="@+id/manTest" android:layout_width="fill_parent"     android:layout_height="wrap_content" /><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /></LinearLayout>

Now there is a solution, but it doesn't feel like this !! Java code
 

1. @ Override
2. Public Boolean onkeydown (INT keycode, keyevent event ){
3. Test. onkeydown (keycode, event );
4. Return super. onkeydown (keycode, event );
5. }
6. The latest code has been added !!

@ Overridepublic Boolean onkeydown (INT keycode, keyevent event) {test. onkeydown (keycode, event); return Super. onkeydown (keycode, event);} has added the latest code !!

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