自定义View,
1. 自定义一个Runnable线程TouchEventCountThread , 用来统计500ms内的点击次数
2. 在MyView中的 onTouchEvent 中调用 上面的线程
3. 自定义一个Handler, 在TouchEventHandler 中 处理 统计到的点击事件, 单击, 双击, 三击, 都可以处理
核心代码如下：
public class MyView extends View { ...... // 统计500ms内的点击次数 TouchEventCountThread mInTouchEventCount = new TouchEventCountThread(); // 根据TouchEventCountThread统计到的点击次数, perform单击还是双击事件 TouchEventHandler mTouchEventHandler = new TouchEventHandler(); @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (0 == mInTouchEventCount.touchCount) // 第一次按下时,开始统计 postDelayed(mInTouchEventCount, 500); break; case MotionEvent.ACTION_UP: // 一次点击事件要有按下和抬起, 有抬起必有按下, 所以只需要在ACTION_UP中处理 mInTouchEventCount.touchCount++; // 如果是长按操作, 则Handler的消息,不能将touchCount置0, 需要特殊处理 if(mInTouchEventCount.isLongClick) { mInTouchEventCount.touchCount = 0; mInTouchEventCount.isLongClick = false; } break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_CANCEL: break; default: break; } return super.onTouchEvent(event); } public class TouchEventCountThread implements Runnable { public int touchCount = 0; public boolean isLongClick = false; @Override public void run() { Message msg = new Message(); if(0 == touchCount){ // long click isLongClick = true; } else { msg.arg1 = touchCount; mTouchEventHandler.sendMessage(msg); touchCount = 0; } } } public class TouchEventHandler extends Handler { @Override public void handleMessage(Message msg) { Toast.makeText(mContext, "touch " + msg.arg1 + " time.", Toast.LENGTH_SHORT).show(); } } ...... }
包装以后如下, 这样就能在别的地方调用了：
public interface OnDoubleClickListener{ void onDoubleClick(View v); } private OnDoubleClickListener mOnDoubleClickListener; public void setOnDoubleClickListener(MyView.OnDoubleClickListener l) { mOnDoubleClickListener = l; } public boolean performDoubleClick() { boolean result = false; if(mOnDoubleClickListener != null) { mOnDoubleClickListener.onDoubleClick(this); result = true; } return result; } public class TouchEventHandler extends Handler { @Override public void handleMessage(Message msg) { if(2 == msg.arg1) performDoubleClick(); } }
在Activity中使用：
myView1.setOnDoubleClickListener(new MyView.OnDoubleClickListener() { @Override public void onDoubleClick(View v) { Toast.makeText(mContext,"double click", Toast.LENGTH_SHORT).show(); } });
全部代码
MyView.java
package com.carloz.test.myapplication.view; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.widget.Toast; import com.carloz.test.myapplication.R; /** * Created by root on 15-11-9. */ public class MyView extends View { private Paint mPaint = new Paint(); private boolean mNotDestroy = true; private int mCount = 0; private MyThread myThread; Bitmap bitmap; // attrs private String mText; private boolean mStartChange; Context mContext; public MyView(Context context) { super(context); init(); } public MyView(Context context, AttributeSet attrs) { super(context, attrs); TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.MyView); mText = ta.getString(R.styleable.MyView_text); mStartChange = ta.getBoolean(R.styleable.MyView_startChange, false); // Log.d("ASDF", "mText=" + mText + ", mStartChange=" + mStartChange); ta.recycle(); init(); } @Override protected void onFinishInflate() { super.onFinishInflate(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mPaint.setTextSize(50); canvas.drawText(mText + mCount++, 20f, 100f, mPaint); canvas.save(); canvas.rotate(60, getWidth() / 2, getHeight() / 2); canvas.drawBitmap(bitmap, 20f, 50f, mPaint); canvas.restore(); if (null == myThread) { myThread = new MyThread(); myThread.start(); } } @Override public boolean dispatchTouchEvent(MotionEvent ev) { return super.dispatchTouchEvent(ev); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); mNotDestroy = true; } @Override protected void onDetachedFromWindow() { mNotDestroy = false; super.onDetachedFromWindow(); } // 统计500ms内的点击次数 TouchEventCountThread mInTouchEventCount = new TouchEventCountThread(); // 根据TouchEventCountThread统计到的点击次数, perform单击还是双击事件 TouchEventHandler mTouchEventHandler = new TouchEventHandler(); @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (0 == mInTouchEventCount.touchCount) // 第一次按下时,开始统计 postDelayed(mInTouchEventCount, 500); break; case MotionEvent.ACTION_UP: // 一次点击事件要有按下和抬起, 有抬起必有按下, 所以只需要在ACTION_UP中处理 mInTouchEventCount.touchCount++; // 如果是长按操作, 则Handler的消息,不能将touchCount置0, 需要特殊处理 if(mInTouchEventCount.isLongClick) { mInTouchEventCount.touchCount = 0; mInTouchEventCount.isLongClick = false; } break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_CANCEL: break; default: break; } return super.onTouchEvent(event); } public class TouchEventCountThread implements Runnable { public int touchCount = 0; public boolean isLongClick = false; @Override public void run() { Message msg = new Message(); if(0 == touchCount){ // long click isLongClick = true; } else { msg.arg1 = touchCount; mTouchEventHandler.sendMessage(msg); touchCount = 0; } } } public class TouchEventHandler extends Handler { @Override public void handleMessage(Message msg) { Toast.makeText(mContext, "touch " + msg.arg1 + " time.", Toast.LENGTH_SHORT).show(); } } class MyThread extends Thread { @Override public void run() { super.run(); while (mNotDestroy) { if (mStartChange) { postInvalidate(); try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } } } } } public void init() { mContext = getContext(); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); } public void setText(String mText) { this.mText = mText; } public void setStartChange(boolean mStartChange) { this.mStartChange = mStartChange; } public boolean getStartChange() { return this.mStartChange; } }
attrs.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MyView"> <attr name="text" format="string"/> <attr name="startChange" format="boolean"/> </declare-styleable> </resources>
postDelayed方法最终是靠 Handler 的 postDelayed 方法 实现原理如下
public final boolean postDelayed(Runnable r, long delayMillis) { return sendMessageDelayed(getPostMessage(r), delayMillis); } public final boolean sendMessageDelayed(Message msg, long delayMillis) { if (delayMillis < 0) { delayMillis = 0; } return sendMessageAtTime(msg, SystemClock.uptimeMillis() + delayMillis); } public boolean sendMessageAtTime(Message msg, long uptimeMillis) { MessageQueue queue = mQueue; if (queue == null) { RuntimeException e = new RuntimeException( this + " sendMessageAtTime() called with no mQueue"); Log.w("Looper", e.getMessage(), e); return false; } return enqueueMessage(queue, msg, uptimeMillis); // 然后在MessageQueue中会比较时间顺序 }
以上就是小编为大家带来的Android 自定义View实现单击和双击事件的方法的全部内容了，希望对大家有所帮助，多多支持脚本之家~