Android编程之滑动按钮事件实例详解

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();  }}

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;  }}

package CMD100.demo.slipButton;public interface OnChangedListener {  abstract void OnChanged(boolean CheckState);}

<?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>

<[包名].SlipButton    android:id = "@+id/slipBtn"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    />

SlipButton myBtn =(SlipButton) findViewById(R.id.slipBtn);myBtn.SetOnChangedListener(...);