1.新建一個類，類名就是SwitchButton

import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener;public class SwitchButton extends View implements OnClickListener {private Bitmap mSwitchBottom, mSwitchThumb, mSwitchFrame, mSwitchMask;private float mCurrentX = 0;private boolean mSwitchOn = true;//開關默認是開著的private int mMoveLength;//最大移動距離private float mLastX = 0;//第一次按下的有效區域private Rect mDest = null;//繪制的目標區域大小private Rect mSrc = null;//截取源圖片的大小private int mDeltX = 0;//移動的偏移量private Paint mPaint = null;private OnChangeListener mListener = null;private boolean mFlag = false;public SwitchButton(Context context) {this(context, null);// TODO Auto-generated constructor stub}public SwitchButton(Context context, AttributeSet attrs) {this(context, attrs, 0);// TODO Auto-generated constructor stub}public SwitchButton(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stubinit();}/*** 初始化相關資源*/public void init() {mSwitchBottom = BitmapFactory.decodeResource(getResources(),R.drawable.switch_bottom);mSwitchThumb = BitmapFactory.decodeResource(getResources(),R.drawable.switch_btn_pressed);mSwitchFrame = BitmapFactory.decodeResource(getResources(),R.drawable.switch_frame);mSwitchMask = BitmapFactory.decodeResource(getResources(),R.drawable.switch_mask);setOnClickListener(this);setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubreturn false;}});mMoveLength = mSwitchBottom.getWidth() - mSwitchFrame.getWidth();mDest = new Rect(0, 0, mSwitchFrame.getWidth(), mSwitchFrame.getHeight());mSrc = new Rect();mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setAlpha(255);mPaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// TODO Auto-generated method stubsetMeasuredDimension(mSwitchFrame.getWidth(), mSwitchFrame.getHeight());}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);if (mDeltX > 0 || mDeltX == 0 && mSwitchOn) {if(mSrc != null) {mSrc.set(mMoveLength - mDeltX, 0, mSwitchBottom.getWidth()- mDeltX, mSwitchFrame.getHeight());}} else if(mDeltX < 0 || mDeltX == 0 && !mSwitchOn){if(mSrc != null) {mSrc.set(-mDeltX, 0, mSwitchFrame.getWidth() - mDeltX,mSwitchFrame.getHeight());}}//這兒是離屏緩沖，自己感覺類似雙緩沖機制吧int count = canvas.saveLayer(new RectF(mDest), null, Canvas.MATRIX_SAVE_FLAG| Canvas.CLIP_SAVE_FLAG | Canvas.HAS_ALPHA_LAYER_SAVE_FLAG| Canvas.FULL_COLOR_LAYER_SAVE_FLAG| Canvas.CLIP_TO_LAYER_SAVE_FLAG);canvas.drawBitmap(mSwitchBottom, mSrc, mDest, null);canvas.drawBitmap(mSwitchThumb, mSrc, mDest, null);canvas.drawBitmap(mSwitchFrame, 0, 0, null);canvas.drawBitmap(mSwitchMask, 0, 0, mPaint);canvas.restoreToCount(count);}@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubswitch (event.getAction()) {case MotionEvent.ACTION_DOWN:mLastX = event.getX();break;case MotionEvent.ACTION_MOVE:mCurrentX = event.getX();mDeltX = (int) (mCurrentX - mLastX);// 如果開關開著向左滑動，或者開關關著向右滑動（這時候是不需要處理的）if ((mSwitchOn && mDeltX < 0) || (!mSwitchOn && mDeltX > 0)) {mFlag = true;mDeltX = 0;}if (Math.abs(mDeltX) > mMoveLength) {mDeltX = mDeltX > 0 ? mMoveLength : - mMoveLength;}invalidate();return true;case MotionEvent.ACTION_UP:if (Math.abs(mDeltX) > 0 && Math.abs(mDeltX) < mMoveLength / 2) {mDeltX = 0;invalidate();return true;} else if (Math.abs(mDeltX) > mMoveLength / 2 && Math.abs(mDeltX) <= mMoveLength) {mDeltX = mDeltX > 0 ? mMoveLength : -mMoveLength;mSwitchOn = !mSwitchOn;if(mListener != null) {mListener.onChange(this, mSwitchOn);}invalidate();mDeltX = 0;return true;} else if(mDeltX == 0 && mFlag) {//這時候得到的是不需要進行處理的，因為已經move過了mDeltX = 0;mFlag = false;return true;}return super.onTouchEvent(event);default:break;}invalidate();return super.onTouchEvent(event);}public void setOnChangeListener(OnChangeListener listener) {mListener = listener;}public interface OnChangeListener {public void onChange(SwitchButton sb, boolean state);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmDeltX = mSwitchOn ? mMoveLength : -mMoveLength;mSwitchOn = !mSwitchOn;if(mListener != null) {mListener.onChange(this, mSwitchOn);}invalidate();mDeltX = 0;} }

2.測試是否好用

import com.example.switchbutton.SwitchButton.OnChangeListener;import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);SwitchButton sb = (SwitchButton) findViewById(R.id.wiperSwitch1);sb.setOnChangeListener(new OnChangeListener() {@Overridepublic void onChange(SwitchButton sb, boolean state) {// TODO Auto-generated method stubLog.d("switchButton", state ? "開":"關");Toast.makeText(MainActivity.this, state ? "開":"關", Toast.LENGTH_SHORT).show();}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;} <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin" ><ImageView android:id="@+id/imageView"android:layout_width="wrap_content"android:layout_height="wrap_content" /><com.example.switchbutton.SwitchButton android:id="@+id/wiperSwitch1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="100dip" /> </LinearLayout>

本文轉載自csdn
原作者swust_chenpeng

原文地址：http://blog.csdn.net/swust_chenpeng/article/details/19967501

注：
白色圓點:switch_btn_pressed;
左白右紅的長條:switch_bottom;
無色長條:switch_frame;
黑色長條:switch_mask.

總結

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