Button 有按下效果 - 续

上次讲过 如何使得Button有按下的效果 但是最后也提过 如果要求几个Button都有这种效果 分别为每一个Button定义一个 *.xml 是不方便的 今天就演示一下简便一点的做法

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[代码 步骤]

1. 准备这2个ImageButton 所需的 *.ico 如：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" ><ImageButton android:id="@+id/play" android:layout_width="wrap_content" android:layout_height="wrap_content" /><ImageButton android:id="@+id/pause" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>

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3. 分别为View 定义名称 便于引用

public void initialView(){    play = (ImageButton) findViewById(R.id.play);    pause = (ImageButton) findViewById(R.id.pause);    }

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4. 为ImageButton play,pause 指定默认背景

public void specifyBackground(){    play.setBackgroundResource(R.drawable.play);    pause.setBackgroundResource(R.drawable.pause);    }

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5. 为ImageButton play,pause 注册 onTouch() 事件 并根据其ID 与 状态 指定具体的背景图

@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubswitch(v.getId()){case R.id.play:if(event.getAction() == MotionEvent.ACTION_DOWN){v.setBackgroundResource(R.drawable.play_down);}else if(event.getAction() == MotionEvent.ACTION_UP){v.setBackgroundResource(R.drawable.play);}break;case R.id.pause:if(event.getAction() == MotionEvent.ACTION_DOWN){v.setBackgroundResource(R.drawable.pause_down);}else if(event.getAction() == MotionEvent.ACTION_UP){v.setBackgroundResource(R.drawable.pause);}break;}return false;}                };                play.setOnTouchListener(listener);        pause.setOnTouchListener(listener);

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6. 所有程序为：

public class ButtonStyle3Usage extends Activity {ImageButton play,pause;OnTouchListener listener;/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                initialView();        specifyBackground();                listener = new OnTouchListener(){@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubswitch(v.getId()){case R.id.play:if(event.getAction() == MotionEvent.ACTION_DOWN){v.setBackgroundResource(R.drawable.play_down);}else if(event.getAction() == MotionEvent.ACTION_UP){v.setBackgroundResource(R.drawable.play);}break;case R.id.pause:if(event.getAction() == MotionEvent.ACTION_DOWN){v.setBackgroundResource(R.drawable.pause_down);}else if(event.getAction() == MotionEvent.ACTION_UP){v.setBackgroundResource(R.drawable.pause);}break;}return false;}                };                play.setOnTouchListener(listener);        pause.setOnTouchListener(listener);    }            public void initialView(){    play = (ImageButton) findViewById(R.id.play);    pause = (ImageButton) findViewById(R.id.pause);    }        public void specifyBackground(){    play.setBackgroundResource(R.drawable.play);    pause.setBackgroundResource(R.drawable.pause);    }}

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7. emulator 运行截图： 静态

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