<com.example.test.SwitchButton android:id="@+id/wiperSwitch1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="100dip" />
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); SwitchButton sb = (SwitchButton) findViewById(R.id.wiperSwitch1); sb.setOnChangeListener(new OnChangeListener() { @Override public void onChange(SwitchButton sb, boolean state) { // TODO Auto-generated method stub Log.d("switchButton", state ? "开":"关"); Toast.makeText(MainActivity.this, state ? "开":"关", Toast.LENGTH_SHORT).show(); } }); } }
switch 自定义SwitchButton.java
package com.example.test; 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; public class SwitchButton extends View implements android.view.View.OnClickListener{ private Bitmap mSwitchBottom, mSwitchThumb, mSwitchFrame, mSwitchMask; private float mCurrentX = 0; private boolean mSwitchOn = true;//开关默认是开着的 private int mMoveLength;//最大移动距离 private float mLastX = 0;//第一次按下的有效区域 private Rect mDest = null;//绘制的目标区域大小 private Rect mSrc = null;//截取源图片的大小 private int mDeltX = 0;//移动的偏移量 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 stub init(); } /** * 初始化相关资源 */ 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() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub return 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)); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub setMeasuredDimension(mSwitchFrame.getWidth(), mSwitchFrame.getHeight()); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.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()); } } //这儿是离屏缓冲,自己感觉类似双缓冲机制吧 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); } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mLastX = event.getX(); break; case MotionEvent.ACTION_MOVE: mCurrentX = event.getX(); mDeltX = (int) (mCurrentX - mLastX); // 如果开关开着向左滑动,或者开关关着向右滑动(这时候是不需要处理的) 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) { //这时候得到的是不需要进行处理的,因为已经move过了 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); } @Override public void onClick(View v) { // TODO Auto-generated method stub mDeltX = mSwitchOn ? mMoveLength : -mMoveLength; mSwitchOn = !mSwitchOn; if(mListener != null) { mListener.onChange(this, mSwitchOn); } invalidate(); mDeltX = 0; } }