Andoird实现类似iphone AssistiveTouch的控件的demo

类似Iphone Assistive Touch的控件的实现

　　网上也有些这方面的控件，不过貌似不怎么好用，或者是论坛需要积分下载，恰好自己在项目中有用到这种控件，就打算自己写一个，也成功实现了这种功能。今天就打算把这个小控件分享到博客上，供大家参考学习。

　　下面贴出控件的代码：

package com.example.com.sus;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.widget.RelativeLayout;
import android.widget.Scroller;

/**
 * file.test4.WSuspensionButton
 *
 * <p>as iphone AssistiveTouch</p>
 * @author b
 * @version 1.0
 *
 */
public class WSuspensionButton extends View {

	private static final int SIZE = 50;
	private int size;
	private int sizeHalf;
	private int stateHeight;
	private Scroller mScroller;
	private int screenWidth;
	private int screenWidthHalf;
	private int screenHeight;
	private int screenHeightHalf;

	private int topLine;
	private int leftLine;
	private int rightLine;
	private int bottomLine;

	public WSuspensionButton(Context context) {
		this(context, null);
	}

	public WSuspensionButton(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	private void init() {

		recordX = 0;
		recordY = 0;
		stateHeight = 0;
		mScroller = new Scroller(getContext());
		DisplayMetrics dm = getContext().getResources().getDisplayMetrics();
		size = (int)(SIZE * dm.density);
		sizeHalf = size / 2;
		screenWidth = dm.widthPixels;// 屏幕宽
		screenHeight = dm.heightPixels - getStatusBarHeight();
		screenWidthHalf = screenWidth / 2;
		screenHeightHalf = screenHeight / 2 + stateHeight;

		// 紧紧只会左右飞
		topLine = 0;
		bottomLine =  screenHeight -  topLine;
	}

	/**
	 * state bar height
	 * @return
	 */
	public int getStatusBarHeight() {// 状态栏高度
		int result = 0;
		int resourceId = getContext().getResources().getIdentifier("status_bar_height",
				"dimen", "android");
		if (resourceId > 0) {
			result = getContext().getResources().getDimensionPixelSize(resourceId);
		}
		return result;
	}

	public int getSize() {
		return size;
	}

	float recordX;
	float recordY;
	float tempX;
	float tempY;
	int recordLeft;
	int recordTop;
	int recordRight;
	int recordBottom;
	int state;
	boolean isMoved;
	@SuppressLint("ClickableViewAccessibility")
	public boolean onTouchEvent(MotionEvent event) {

		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			state = 0;
			isMoved = false;
			recordX = event.getRawX();
			recordY = event.getRawY();
			tempX = recordX;
			tempY = recordY;
			break;
		case MotionEvent.ACTION_MOVE:
			int intx = (int)(event.getRawX() - tempX);
			int inty = (int)(event.getRawY() - tempY);
			tempX = event.getRawX();
			tempY = event.getRawY();
			if(Math.abs(tempX - recordX) < 5 && Math.abs(tempY - recordY) < 5) {
				if(state == 0) {
					state = 1;
					return true;
				}
			} else {
				isMoved = true;
			}
			if(isMoved && state != 2)
				state = 2;
			if(state != 2) return true;
			int left = getLeft() + intx;
			int top = getTop() + inty;
			int right = getRight() + intx;
			int bottom = getBottom() + inty;
			if(left < 0) {
				left = 0;
				right = getWidth();
			}
			if(right > screenWidth) {
				left = screenWidth - getWidth();
				right = screenWidth;
			}
			if(top < stateHeight) {
				top = stateHeight;
				bottom = stateHeight + getHeight();
			}
			if(bottom > screenHeight) {
				top = screenHeight - getHeight();
				bottom = screenHeight;
			}
			layout(left, top, right, bottom);
			break;
		case MotionEvent.ACTION_UP:
			if(state != 2) {
				if(clickedlistener != null)
					clickedlistener.onClick(this);
				return true;
			}
			recordLeft = getLeft();
			recordTop = getTop();
			recordRight = getRight();
			recordBottom = getBottom();
			Log.v("AC", "left:"+recordLeft+"\nright:"+recordRight+"\ntop:"+recordTop+"\nbottom:"+recordBottom);
			if(getLeft() <= 0 || getTop() <= stateHeight ||
					getRight() >= screenWidth || getBottom() >= screenHeight) {
				RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)getLayoutParams();
				int leftX = getLeft();
				int topX = getTop();
				params.setMargins(getLeft(), getTop(), 0, 0);
				setLayoutParams(params);
				if(completeMoveListener != null) completeMoveListener.onCompleteMove(this, leftX, topX);
			} else {
				// 控件中心y，小于topline，向上飞
				// 控件中心y，大于bottomLine，向下飞
				// 控件中心x，小于屏幕可视中心x，向左飞
				// 控件中心x，大于屏幕可视中心x，向右飞
				if((getTop() + sizeHalf) <= topLine) {
					scrollToTop();
				} else if((getBottom() + sizeHalf) >= bottomLine) {
					scrollToBottom();
				} else if((getLeft() + sizeHalf) < screenWidthHalf) {
					scrollToLeft();
				} else {
					scrollToRight();
				}
			}
			break;
		default:
			break;
		}

		return true;
	}

	public void computeScroll() {
		if(mScroller.computeScrollOffset()) {
			layout(recordLeft + mScroller.getCurrX(),
					recordTop + mScroller.getCurrY(),
					recordRight + mScroller.getCurrX(),
					recordBottom + mScroller.getCurrY());
			postInvalidate();
			if(mScroller.isFinished()) {
				RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)getLayoutParams();
				int left = recordLeft + mScroller.getCurrX();
				int top = recordTop + mScroller.getCurrY();
				params.setMargins(left, top, 0, 0);
				setLayoutParams(params);
				if(completeMoveListener != null) completeMoveListener.onCompleteMove(this, left, top);
			}
		}

	}

	private void scrollToLeft() {
		mScroller.startScroll(0, 0, -recordLeft, 0);
		postInvalidate();
	}

	private void scrollToTop() {
		mScroller.startScroll(0, 0, 0, -recordTop + stateHeight);
		postInvalidate();
	}

	private void scrollToRight() {
		mScroller.startScroll(0, 0, screenWidth - recordRight, 0);
		postInvalidate();
	}

	private void scrollToBottom() {
		mScroller.startScroll(0, 0, 0, screenHeight - recordBottom);
		postInvalidate();
	}

	//-------------------
	// 监听
	//-------------------
	private ClickListener clickedlistener;
	public void setClickListener(ClickListener clickedlistener) {
		this.clickedlistener = clickedlistener;
	}
	public interface ClickListener {
		public void onClick(View v);
	}

	private CompleteMoveListener completeMoveListener;
	public void setCompleteMoveListener(CompleteMoveListener completeMoveListener) {
		this.completeMoveListener = completeMoveListener;
	}
	public interface CompleteMoveListener {
		public void onCompleteMove(View v, int left, int top);
	}
}

　　原则上可以向上，向下，向左，向有飞，但实现的时候感觉阉割一下下比较清爽，就只实现了左右飞，判断控件移动方向是根据控件空心位置和限制条件决定的：

private int topLine;
private int bottomLine;
private int leftLine;
private int rightLine

　　限制条件是1、topLine=0，2、bottomLine=screenHeight-状态栏高度，3、screenHeight=屏幕高-状态栏高，4、屏幕中心x坐标。

　　下面是main.xml布局文件：

<RelativeLayout 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"
    tools:context="com.example.com.sus.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <com.example.com.sus.WSuspensionButton
        android:id="@+id/btnSus"
        android:layout_width="50dp"
        android:layout_height="50dp"
        />

</RelativeLayout>

　　下面是在Activity中的初始化设置：

WSuspensionButton suspensionButton = (WSuspensionButton)findViewById(R.id.btnSus);
int size = suspensionButton.getSize();
suspensionButton.setBackground(new ColorDrawable(Color.BLUE));
RelativeLayout.LayoutParams wmParams = new RelativeLayout.LayoutParams(
				size, size);
wmParams.leftMargin = preferences.getInt("suspend_btn_x", dm.widthPixels
				- size);
wmParams.topMargin = preferences.getInt("suspend_btn_y",
				(dm.heightPixels - size) / 2);
suspensionButton.setLayoutParams(wmParams);// 取本地存入的位置信息，并从新设定控件的坐标
suspensionButton
				.setClickListener(new WSuspensionButton.ClickListener() {

					public void onClick(View v) {
						showToast();
					}

					private void showToast() {
						Toast.makeText(mActivity,
								"You clicked speaker button!",
								Toast.LENGTH_SHORT).show();
					}
				});
suspensionButton
				.setCompleteMoveListener(new WSuspensionButton.CompleteMoveListener() {

					public void onCompleteMove(View v, int left, int top) {
						saveInLocal(left, top);
					}

					private void saveInLocal(int left, int top) {
						SharedPreferences.Editor editor = preferences.edit();
						editor.putInt("suspend_btn_x", left);
						editor.putInt("suspend_btn_y", top);
						editor.commit();
					}
				});

　　在初始化该控件的时候，对该控件的大小以及屏幕中显示的位置进行了从新设置，让其显示在靠屏幕右侧的中心位置。

　　好了，以上就是今天的干货。分享愉快

　　转载请标明转载地址：http://www.cnblogs.com/swalka/p/5078109.html