Android仿iphone开关按钮
16lz
2021-01-26
import android.annotation.SuppressLint;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;/** * 仿iphone 开关按钮 * * @author sunyoujun */public class SwitchButton extends View implements OnTouchListener { private boolean isChoose = false;// 记录当前按钮是否打开,true为打开,flase为关闭 private boolean isChecked; private boolean onSlip = false;// 记录用户是否在滑动的变量 private float down_x, now_x;// 按下时的x,当前的x private Rect btn_off, btn_on;// 打开和关闭状态下,游标的Rect . private boolean isChangeOn = false; private boolean isInterceptOn = false; private OnChangedListener onChangedListener; private Bitmap bg_on, bg_off, slip_btn; public SwitchButton(Context context) { super(context); init(); } public SwitchButton(Context context, AttributeSet attrs) { super(context, attrs); init(); } public SwitchButton(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } private void init() {// 初始化 bg_on = BitmapFactory.decodeResource(getResources(), R.drawable.nim_slide_toggle_on); bg_off = BitmapFactory.decodeResource(getResources(), R.drawable.nim_slide_toggle_off); slip_btn = BitmapFactory.decodeResource(getResources(), R.drawable.nim_slide_toggle); btn_off = new Rect(0, 0, slip_btn.getWidth(), slip_btn.getHeight()); btn_on = 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 } @SuppressLint("DrawAllocation") @Override protected void onDraw(Canvas canvas) {// 绘图函数 super.onDraw(canvas); Matrix matrix = new Matrix(); Paint paint = new Paint(); float x; // 滑动到前半段与后半段的背景不同,在此做判断 if (now_x < (bg_on.getWidth() / 2)) { x = now_x - slip_btn.getWidth() / 2; canvas.drawBitmap(bg_off, matrix, paint);// 画出关闭时的背景 } else { x = bg_on.getWidth() - slip_btn.getWidth() / 2; canvas.drawBitmap(bg_on, matrix, paint);// 画出打开时的背景 } // 是否是在滑动状态 if (onSlip) { if (now_x >= 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 if (now_x < 0) { x = 0; } else { x = now_x - slip_btn.getWidth() / 2; } } else {// 非滑动状态 if (isChoose) {// 根据现在的开关状态设置画游标的位置 x = btn_on.left; canvas.drawBitmap(bg_on, matrix, paint);// 初始状态为true时应该画出打开状态图片 } else { x = btn_off.left; } } if (isChecked) { canvas.drawBitmap(bg_on, matrix, paint); x = btn_on.left; isChecked = !isChecked; } // 对游标位置进行异常判断... if (x < 0) { 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. } public boolean onTouch(View v, MotionEvent event) { boolean old = isChoose; switch (event.getAction()) { case MotionEvent.ACTION_MOVE:// 滑动 now_x = event.getX(); break; case MotionEvent.ACTION_DOWN:// 按下 if (event.getX() > bg_on.getWidth() || event.getY() > bg_on.getHeight()) { return false; } onSlip = true; down_x = event.getX(); now_x = down_x; break; case MotionEvent.ACTION_CANCEL: // 移到控件外部 onSlip = false; boolean choose = isChoose; if (now_x >= (bg_on.getWidth() / 2)) { now_x = bg_on.getWidth() - slip_btn.getWidth() / 2; isChoose = true; } else { now_x = now_x - slip_btn.getWidth() / 2; isChoose = false; } if (isChangeOn && (choose != isChoose)) { // 如果设置了监听器,就调用其方法.. onChangedListener.OnChanged(this, isChoose); } break; case MotionEvent.ACTION_UP:// 松开 onSlip = false; boolean lastChoose = isChoose; if (event.getX() >= (bg_on.getWidth() / 2)) { now_x = bg_on.getWidth() - slip_btn.getWidth() / 2; isChoose = true; } else { now_x = now_x - slip_btn.getWidth() / 2; isChoose = false; } if (lastChoose == isChoose) {// 相等表示点击状态未切换，之后切换状态 if (event.getX() >= (bg_on.getWidth() / 2)) { now_x = 0; isChoose = false; } else { now_x = bg_on.getWidth() - slip_btn.getWidth() / 2; isChoose = true; } } // 如果设置了监听器,就调用其方法.. if (isChangeOn) { onChangedListener.OnChanged(this, isChoose); } break; default: } if (!old && isInterceptOn) { isChoose = false; } else { invalidate();// 重画控件 } return true; } public void setOnChangedListener(OnChangedListener listener) {// 设置监听器,当状态修改的时候 isChangeOn = true; onChangedListener = listener; } public interface OnChangedListener { abstract void OnChanged(View v, boolean checkState); } public void setCheck(boolean isChecked) { this.isChecked = isChecked; isChoose = isChecked; if (isChecked == false) { now_x = 0; } invalidate(); } public boolean isChoose() { return this.isChoose; } public boolean getCheck() { return this.isChecked; } public void setInterceptState(boolean isIntercept) {// 设置监听器,是否在重画前拦截事件,状态由false变true时 拦截事件 isInterceptOn = isIntercept; // onInterceptListener = listener; }}更多相关文章
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