iphone上有开关控件,很漂亮,其实android4.0以后也有switch控件,但是只能用在4.0以后的系统中,这就失去了其使用价值,而且我觉得它的界面也不是很好看。最近看到了百度魔拍上面的一个控件,觉得很漂亮啊,然后反编译了下,尽管没有混淆过,但是还是不好读,然后就按照自己的想法写了个,功能和百度魔拍类似。
下面是百度魔拍的效果和SlideSwitch的效果
apk下载地址:http://home.ustc.edu.cn/~voa/res/HelloJni.apk
2.原理
继承自view类,override其onDraw函数,把两个背景图(一个灰的一个红的)和一个开关图(圆开关)通过canvas画出来;同时override其onTouchEvent函数,实现滑动效果;最后开启一个线程做动画,实现缓慢滑动的效果。
3. 代码
//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滑动开关组件,仿百度魔图滑动开关组件
- * 组件分为三种状态:打开、关闭、正在滑动<br/>
- * 使用方法:
- *
SlideSwitch slideSwitch = new SlideSwitch(this);
- *slideSwitch.setOnSwitchChangedListener(onSwitchChangedListener);
- *linearLayout.addView(slideSwitch);
- 注:也可以加载在xml里面使用
- * @author scott
- *
- */
- public class SlideSwitch extends View
- {
- public static final String TAG = “SlideSwitch”;
- public static final int SWITCH_OFF = 0;//关闭状态
- public static final int SWITCH_ON = 1;//打开状态
- public static final int SWITCH_SCROLING = 2;//滚动状态
- //用于显示的文本
- private String mOnText = “打开”;
- private String mOffText = “关闭”;
- private int mSwitchStatus = SWITCH_OFF;
- private boolean mHasScrolled = false;//表示是否发生过滚动
- 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;
- //开关状态图
- 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();
- }
- //初始化三幅图片
- 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);
- }
- /**
- * 为开关控件设置状态改变监听函数
- * @param onSwitchChangedListener 参见 [email protected] OnSwitchChangedListener}
- */
- public void setOnSwitchChangedListener(OnSwitchChangedListener onSwitchChangedListener)
- {
- mOnSwitchChangedListener = onSwitchChangedListener;
- }
- /**
- * 设置开关上面的文本
- * @param onText 控件打开时要显示的文本
- * @param offText 控件关闭时要显示的文本
- */
- public void setText(final String onText, final String offText)
- {
- mOnText = onText;
- mOffText =offText;
- invalidate();
- }
- /**
- * 设置开关的状态
- * @param on 是否打开开关 打开为true 关闭为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)//如果没有发生过滑动,就意味着这是一次单击过程
- {
- 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;
- }
- //状态改变的时候 回调事件函数
- 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);
- //绘图的时候 内部用到了一些数值的硬编码,其实不太好,
- //主要是考虑到图片的原因,图片周围有透明边界,所以要有一定的偏移
- //硬编码的数值只要看懂了代码,其实可以理解其含义,可以做相应改进。
- 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 做滑动动画所使用的线程
- */
- private class AnimationTransRunnable implements Runnable
- {
- private int srcX, dstX;
- private int duration;
- /**
- * 滑动动画
- * @param srcX 滑动起始点
- * @param dstX 滑动终止点
- * @param duration 是否采用动画,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
- {
- /**
- * 状态改变 回调函数
- * @param status SWITCH_ON表示打开 SWITCH_OFF表示关闭
- */
- 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=“网络构图”
- 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=“保留原图”
- 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=“拍照声音”
- 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” />
原创文章,作者:奋斗,如若转载,请注明出处:https://blog.ytso.com/5616.html