android自定義開關控件-SlideSwitch的實例

iphone上有開關控件，很漂亮，其實android4.0以後也有switch控件，但是只能用在4.0以後的系統中，這就失去了其使用價值，而且我覺得它的界面也不是很好看。最近看到了百度魔拍上面的一個控件，覺得很漂亮啊，然後反編譯了下，盡管沒有混淆過，但是還是不好讀，然後就按照自己的想法寫了個，功能和百度魔拍類似。

下面是百度魔拍的效果和SlideSwitch的效果

一、原理

繼承自view類，override其onDraw函數，把兩個背景圖（一個灰的一個紅的）和一個開關圖（圓開關）通過canvas畫出來；同時override其onTouchEvent函數，實現滑動效果；最後開啟一個線程做動畫，實現緩慢滑動的效果。

二、代碼

SlideSwitch.java

package com.example.hellojni; 
 
import android.content.Context; 
import android.content.res.Resources; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Rect; 
import android.graphics.Typeface; 
import android.util.AttributeSet; 
import android.util.Log; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
 
/** 
 * SlideSwitch 仿iphone滑動開關組件，仿百度魔圖滑動開關組件 
 * 組件分為三種狀態：打開、關閉、正在滑動<br/> 
 * 使用方法：     
 * <pre>SlideSwitch slideSwitch = new SlideSwitch(this); 
 *slideSwitch.setOnSwitchChangedListener(onSwitchChangedListener); 
 *linearLayout.addView(slideSwitch); 
</pre> 
注：也可以加載在xml裡面使用 
 * @author scott 
 * 
 */ 
public class SlideSwitch extends View 
{ 
  public static final String TAG = "SlideSwitch"; 
  public static final int SWITCH_OFF = 0;//關閉狀態 
  public static final int SWITCH_ON = 1;//打開狀態 
  public static final int SWITCH_SCROLING = 2;//滾動狀態 
   
  //用於顯示的文本 
  private String mOnText = "打開"; 
  private String mOffText = "關閉"; 
 
  private int mSwitchStatus = SWITCH_OFF; 
 
  private boolean mHasScrolled = false;//表示是否發生過滾動 
 
  private int mSrcX = 0, mDstX = 0; 
   
  private int mBmpWidth = 0; 
  private int mBmpHeight = 0; 
  private int mThumbWidth = 0; 
 
  private   Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
   
  private OnSwitchChangedListener mOnSwitchChangedListener = null; 
 
  //開關狀態圖 
  Bitmap mSwitch_off, mSwitch_on, mSwitch_thumb; 
 
  public SlideSwitch(Context context)  
  { 
    this(context, null); 
  } 
 
  public SlideSwitch(Context context, AttributeSet attrs)  
  { 
    super(context, attrs); 
    init(); 
  } 
 
  public SlideSwitch(Context context, AttributeSet attrs, int defStyle) 
  { 
    super(context, attrs, defStyle); 
    init(); 
  } 
 
  //初始化三幅圖片 
  private void init() 
  { 
    Resources res = getResources(); 
    mSwitch_off = BitmapFactory.decodeResource(res, R.drawable.bg_switch_off); 
    mSwitch_on = BitmapFactory.decodeResource(res, R.drawable.bg_switch_on); 
    mSwitch_thumb = BitmapFactory.decodeResource(res, R.drawable.switch_thumb); 
    mBmpWidth = mSwitch_on.getWidth(); 
    mBmpHeight = mSwitch_on.getHeight(); 
    mThumbWidth = mSwitch_thumb.getWidth(); 
  } 
 
  @Override 
  public void setLayoutParams(LayoutParams params)  
  { 
    params.width = mBmpWidth; 
    params.height = mBmpHeight; 
    super.setLayoutParams(params); 
  } 
   
  /** 
   * 為開關控件設置狀態改變監聽函數 
   * @param onSwitchChangedListener 參見 {@link OnSwitchChangedListener} 
   */ 
  public void setOnSwitchChangedListener(OnSwitchChangedListener onSwitchChangedListener) 
  { 
    mOnSwitchChangedListener = onSwitchChangedListener; 
  } 
   
  /** 
   * 設置開關上面的文本 
   * @param onText 控件打開時要顯示的文本 
   * @param offText 控件關閉時要顯示的文本 
   */ 
  public void setText(final String onText, final String offText) 
  { 
    mOnText = onText; 
    mOffText =offText; 
    invalidate(); 
  } 
   
  /** 
   * 設置開關的狀態 
   * @param on 是否打開開關 打開為true 關閉為false 
   */ 
  public void setStatus(boolean on) 
  { 
    mSwitchStatus = ( on ? SWITCH_ON : SWITCH_OFF); 
  } 
   
  @Override 
  public boolean onTouchEvent(MotionEvent event) 
  { 
    int action = event.getAction(); 
    Log.d(TAG, "onTouchEvent x=" + event.getX()); 
    switch (action) { 
    case MotionEvent.ACTION_DOWN: 
      mSrcX = (int) event.getX(); 
      break; 
    case MotionEvent.ACTION_MOVE: 
      mDstX = Math.max( (int) event.getX(), 10); 
      mDstX = Math.min( mDstX, 62); 
      if(mSrcX == mDstX) 
        return true; 
      mHasScrolled = true; 
      AnimationTransRunnable aTransRunnable = new AnimationTransRunnable(mSrcX, mDstX, 0); 
      new Thread(aTransRunnable).start(); 
      mSrcX = mDstX; 
      break; 
    case MotionEvent.ACTION_UP: 
      if(mHasScrolled == false)//如果沒有發生過滑動，就意味著這是一次單擊過程 
      { 
        mSwitchStatus = Math.abs(mSwitchStatus-1); 
        int xFrom = 10, xTo = 62; 
        if(mSwitchStatus == SWITCH_OFF) 
        { 
          xFrom = 62; 
          xTo = 10; 
        } 
        AnimationTransRunnable runnable = new AnimationTransRunnable(xFrom, xTo, 1); 
        new Thread(runnable).start(); 
      } 
      else 
      { 
        invalidate(); 
        mHasScrolled = false; 
      } 
      //狀態改變的時候 回調事件函數 
      if(mOnSwitchChangedListener != null) 
      { 
        mOnSwitchChangedListener.onSwitchChanged(this, mSwitchStatus); 
      } 
      break; 
 
    default: 
      break; 
    } 
    return true; 
  } 
 
  @Override 
  protected void onSizeChanged(int w, int h, int oldw, int oldh) 
  { 
    super.onSizeChanged(w, h, oldw, oldh); 
  } 
 
  @Override 
  protected void onDraw(Canvas canvas) 
  { 
    super.onDraw(canvas); 
    //繪圖的時候 內部用到了一些數值的硬編碼，其實不太好， 
    //主要是考慮到圖片的原因，圖片周圍有透明邊界，所以要有一定的偏移 
    //硬編碼的數值只要看懂了代碼，其實可以理解其含義，可以做相應改進。 
    mPaint.setTextSize(14); 
    mPaint.setTypeface(Typeface.DEFAULT_BOLD); 
     
    if(mSwitchStatus == SWITCH_OFF) 
    { 
      drawBitmap(canvas, null, null, mSwitch_off); 
      drawBitmap(canvas, null, null, mSwitch_thumb); 
      mPaint.setColor(Color.rgb(105, 105, 105)); 
      canvas.translate(mSwitch_thumb.getWidth(), 0); 
      canvas.drawText(mOffText, 0, 20, mPaint); 
    } 
    else if(mSwitchStatus == SWITCH_ON) 
    { 
      drawBitmap(canvas, null, null, mSwitch_on); 
      int count = canvas.save(); 
      canvas.translate(mSwitch_on.getWidth() - mSwitch_thumb.getWidth(), 0); 
      drawBitmap(canvas, null, null, mSwitch_thumb); 
      mPaint.setColor(Color.WHITE); 
      canvas.restoreToCount(count); 
      canvas.drawText(mOnText, 17, 20, mPaint); 
    } 
    else //SWITCH_SCROLING 
    { 
      mSwitchStatus = mDstX > 35 ? SWITCH_ON : SWITCH_OFF; 
      drawBitmap(canvas, new Rect(0, 0, mDstX, mBmpHeight), new Rect(0, 0, (int)mDstX, mBmpHeight), mSwitch_on); 
      mPaint.setColor(Color.WHITE); 
      canvas.drawText(mOnText, 17, 20, mPaint); 
 
      int count = canvas.save(); 
      canvas.translate(mDstX, 0); 
      drawBitmap(canvas, new Rect(mDstX, 0, mBmpWidth, mBmpHeight), 
             new Rect(0, 0, mBmpWidth - mDstX, mBmpHeight), mSwitch_off); 
      canvas.restoreToCount(count); 
 
      count = canvas.save(); 
      canvas.clipRect(mDstX, 0, mBmpWidth, mBmpHeight); 
      canvas.translate(mThumbWidth, 0); 
      mPaint.setColor(Color.rgb(105, 105, 105)); 
      canvas.drawText(mOffText, 0, 20, mPaint); 
      canvas.restoreToCount(count); 
 
      count = canvas.save(); 
      canvas.translate(mDstX - mThumbWidth / 2, 0); 
      drawBitmap(canvas, null, null, mSwitch_thumb); 
      canvas.restoreToCount(count); 
    } 
 
  } 
 
  public void drawBitmap(Canvas canvas, Rect src, Rect dst, Bitmap bitmap) 
  { 
    dst = (dst == null ? new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()) : dst); 
    Paint paint = new Paint(); 
    canvas.drawBitmap(bitmap, src, dst, paint); 
  } 
 
  /** 
   * AnimationTransRunnable 做滑動動畫所使用的線程 
   */ 
  private class AnimationTransRunnable implements Runnable 
  { 
    private int srcX, dstX; 
    private int duration; 
 
    /** 
     * 滑動動畫 
     * @param srcX 滑動起始點 
     * @param dstX 滑動終止點 
     * @param duration 是否采用動畫，1采用，0不采用 
     */ 
    public AnimationTransRunnable(float srcX, float dstX, final int duration) 
    { 
      this.srcX = (int)srcX; 
      this.dstX = (int)dstX; 
      this.duration = duration; 
    } 
 
    @Override 
    public void run()  
    { 
      final int patch = (dstX > srcX ? 5 : -5); 
      if(duration == 0) 
      { 
        SlideSwitch.this.mSwitchStatus = SWITCH_SCROLING; 
        SlideSwitch.this.postInvalidate(); 
      } 
      else 
      { 
        Log.d(TAG, "start Animation: [ " + srcX + " , " + dstX + " ]"); 
        int x = srcX + patch; 
        while (Math.abs(x-dstX) > 5)  
        { 
          mDstX = x; 
          SlideSwitch.this.mSwitchStatus = SWITCH_SCROLING; 
          SlideSwitch.this.postInvalidate(); 
          x += patch; 
          try  
          { 
            Thread.sleep(10); 
          }  
          catch (InterruptedException e) 
          { 
            e.printStackTrace(); 
          } 
        } 
        mDstX = dstX; 
        SlideSwitch.this.mSwitchStatus = mDstX > 35 ? SWITCH_ON : SWITCH_OFF; 
        SlideSwitch.this.postInvalidate(); 
      } 
    } 
 
  } 
 
  public static interface OnSwitchChangedListener 
  { 
    /** 
     * 狀態改變 回調函數 
     * @param status SWITCH_ON表示打開 SWITCH_OFF表示關閉 
     */ 
    public abstract void onSwitchChanged(SlideSwitch obj, int status); 
  } 
 
} 

layout xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:background="#fdfdfd" 
  android:orientation="vertical" 
  android:paddingLeft="10dip" 
  android:paddingRight="10dip" > 
 
  <ImageView 
    android:id="@+id/imageView1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:src="@drawable/top" /> 
 
  <RelativeLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" > 
 
    <TextView 
      android:id="@+id/textView1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_centerVertical="true" 
      android:text="網絡構圖" 
      android:textSize="15sp" /> 
 
    <com.example.hellojni.SlideSwitch 
      android:id="@+id/slideSwitch1" 
      android:layout_width="116dip" 
      android:layout_height="46dip" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true" /> 
  </RelativeLayout> 
 
  <RelativeLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" > 
 
    <TextView 
      android:id="@+id/textView2" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_centerVertical="true" 
      android:text="保留原圖" 
      android:textSize="15sp" /> 
 
    <com.example.hellojni.SlideSwitch 
      android:id="@+id/slideSwitch2" 
      android:layout_width="116dip" 
      android:layout_height="46dip" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true" /> 
  </RelativeLayout> 
 
  <RelativeLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" > 
 
    <TextView 
      android:id="@+id/textView3" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_centerVertical="true" 
      android:text="拍照聲音" 
      android:textSize="15sp" /> 
 
    <com.example.hellojni.SlideSwitch 
      android:id="@+id/slideSwitch3" 
      android:layout_width="116px" 
      android:layout_height="46px" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true" /> 
  </RelativeLayout> 
 
  <TextView 
    android:id="@+id/textViewTip" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:gravity="center" 
    android:text="TextView" /> 
 
</LinearLayout> 

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