今天记录一下滑动按钮功能，效果图如下：
分别建立三个文件，第一个是main.class，第二个是SlipButton.class，第三个是 onchangeListener.class。
main.class
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
public class Main extends Activity implements OnChangedListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SlipButton myBtn = (SlipButton) findViewById(R.id.slipBtn);// 获得指定控件
myBtn.SetOnChangedListener(this);// 为控件设置监听器
}
@Override
public void OnChanged(boolean CheckState) {// 当按钮状态被改变时
// TODO Auto-generated method stub
if (CheckState)
Toast.makeText(this, "打开了...", Toast.LENGTH_SHORT).show();
else
Toast.makeText(this, "关闭了...", Toast.LENGTH_SHORT).show();
}
}
SlipButton.class
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
public class SlipButton extends View implements OnTouchListener {
private boolean NowChoose = false;// 记录当前按钮是否打开,true为打开,flase为关闭
private boolean OnSlip = false;// 记录用户是否在滑动的变量
private float DownX, NowX;// 按下时的x,当前的x,
private Rect Btn_On, Btn_Off;// 打开和关闭状态下,游标的Rect
private boolean isChgLsnOn = false;
private OnChangedListener ChgLsn;
private Bitmap bg_on, bg_off, slip_btn;
public SlipButton(Context context) {
super(context);
// TODO Auto-generated constructor stub
init();
}
public SlipButton(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init();
}
private void init() {// 初始化
// 载入图片资源
bg_on = BitmapFactory.decodeResource(getResources(),
R.drawable.slip_bg_on);
bg_off = BitmapFactory.decodeResource(getResources(),
R.drawable.slip_bg_off);
slip_btn = BitmapFactory.decodeResource(getResources(),
R.drawable.slip_btn);
// 获得需要的Rect数据
Btn_On = new Rect(0, 0, slip_btn.getWidth(), slip_btn.getHeight());
Btn_Off = new Rect(bg_off.getWidth() - slip_btn.getWidth(), 0,
bg_off.getWidth(), slip_btn.getHeight());
setOnTouchListener(this);// 设置监听器,也可以直接复写OnTouchEvent
}
@Override
protected void onDraw(Canvas canvas) {// 绘图函数
// TODO Auto-generated method stub
super.onDraw(canvas);
Matrix matrix = new Matrix();
Paint paint = new Paint();
float x;
{
if (NowX < (bg_on.getWidth() / 2))// 滑动到前半段与后半段的背景不同,在此做判断
canvas.drawBitmap(bg_off, matrix, paint);// 画出关闭时的背景
else
canvas.drawBitmap(bg_on, matrix, paint);// 画出打开时的背景
if (OnSlip)// 是否是在滑动状态,
{
if (NowX >= bg_on.getWidth())// 是否划出指定范围,不能让游标跑到外头,必须做这个判断
x = bg_on.getWidth() - slip_btn.getWidth() / 2;// 减去游标1/2的长度...
else
x = NowX - slip_btn.getWidth() / 2;
} else {// 非滑动状态
if (NowChoose)// 根据现在的开关状态设置画游标的位置
x = Btn_Off.left;
else
x = Btn_On.left;
}
if (x < 0)// 对游标位置进行异常判断...
x = 0;
else if (x > bg_on.getWidth() - slip_btn.getWidth())
x = bg_on.getWidth() - slip_btn.getWidth();
canvas.drawBitmap(slip_btn, x, 0, paint);// 画出游标.
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch (event.getAction())// 根据动作来执行代码
{
case MotionEvent.ACTION_MOVE:// 滑动
NowX = event.getX();
break;
case MotionEvent.ACTION_DOWN:// 按下
if (event.getX() > bg_on.getWidth()
|| event.getY() > bg_on.getHeight())
return false;
OnSlip = true;
DownX = event.getX();
NowX = DownX;
break;
case MotionEvent.ACTION_UP:// 松开
OnSlip = false;
boolean LastChoose = NowChoose;
if (event.getX() >= (bg_on.getWidth() / 2))
NowChoose = true;
else
NowChoose = false;
if (isChgLsnOn && (LastChoose != NowChoose))// 如果设置了监听器,就调用其方法..
ChgLsn.OnChanged(NowChoose);
break;
default:
}
invalidate();// 重画控件
return true;
}
public void SetOnChangedListener(OnChangedListener l) {// 设置监听器,当状态修改的时候
isChgLsnOn = true;
ChgLsn = l;
}
}
onchangeListener.class
package CMD100.demo.slipButton;
public interface OnChangedListener {
abstract void OnChanged(boolean CheckState);
}
main.xml代码
<?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">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/hello" />
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent"android:layout_height="wrap_content"
android:background="#ff0000">
<TextView android:text="测试:" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<CMD100.demo.slipButton.SlipButton
android:id="@+id/slipBtn" android:layout_width="wrap_content"
android:layout_height="wrap_content"android:layout_marginLeft="10sp" />
</LinearLayout>
</LinearLayout>
注意：在xml里头要放置的位置
<[包名].SlipButton
android:id = "@+id/slipBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
然后可以像其他控件一样使用了...
SlipButton myBtn =(SlipButton) findViewById(R.id.slipBtn);
myBtn.SetOnChangedListener(...);
代码到这里就全部完成了。
原创作者是：zcmmwbd
