仿SlidingMenu

看資料仿照做了一個

MainActivity.java:

package com.example.sildingmenudemo;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		LinearLayout leftViewGroup = createLeftView();

		LinearLayout rightViewGroup = createRightView();

		final MySildingMenu mSlidingMenu = new MySildingMenu(this);
		mSlidingMenu.addLeftView(leftViewGroup);

		mSlidingMenu.addRightView(rightViewGroup);
		setContentView(mSlidingMenu);

	}

	private LinearLayout createRightView() {
		LinearLayout rightViewGroup = new LinearLayout(this);
		rightViewGroup.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
				LayoutParams.FILL_PARENT));
		rightViewGroup.setBackgroundColor(Color.BLUE);
		TextView rightView = new TextView(this);
		rightView.setText("點擊當前藍色區域");
		rightViewGroup.addView(rightView);
		return rightViewGroup;
	}

	private LinearLayout createLeftView() {
		LinearLayout leftViewGroup = new LinearLayout(this);
		leftViewGroup.setLayoutParams(new LayoutParams(300, LayoutParams.FILL_PARENT));
		leftViewGroup.setBackgroundColor(Color.GREEN);
		TextView leftView = new TextView(this);
		leftView.setText("Left View");
		leftViewGroup.addView(leftView);
		return leftViewGroup;
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

以上注意：

leftViewGroup 和 rightViewGroup 其實相當於rightViewGroup 蓋在了leftViewGroup之上 

MySildingMenu:

package com.example.sildingmenudemo;

import android.content.Context;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Scroller;

public class MySildingMenu extends ViewGroup {
	private View mRightView;
	private View mLeftView;

	private int mLastX;

	private int mMotionX;

	private ScrollRunnable mScrollRunnable;

	public MySildingMenu(Context context) {
		super(context);
	}

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

	public MySildingMenu(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public void addLeftView(View leftView) {
		mLeftView = leftView;
		addView(leftView);
	}

	/**
	 * 提供右側顯示視圖
	 * 
	 * @param rightView
	 */
	public void addRightView(View rightView) {
		mRightView = rightView;
		addView(rightView);

	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		measureChildren(widthMeasureSpec, heightMeasureSpec);
		int widthSize = MeasureSpec.getSize(widthMeasureSpec);
		int heightSize = MeasureSpec.getSize(heightMeasureSpec);

		setMeasuredDimension(widthSize, heightSize);

	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		int childCount = getChildCount();

		for (int i = 0; i < childCount; i++) {
			View childView = getChildAt(i);

			int measureWidth = childView.getMeasuredWidth();
			int measureHeight = childView.getMeasuredHeight();

			childView.layout(l, 0, l + measureWidth, measureHeight);
		}
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		final int x = (int) event.getX();
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			mLastX = x;
			mMotionX = x;

			if (mScrollRunnable != null) {
				mScrollRunnable.endScroll();
				mScrollRunnable = null;
			}
			boolean inRegion = canSliding(event);
			return inRegion;
		case MotionEvent.ACTION_MOVE:
			scrollIfNeed(x);
			return true;
		case MotionEvent.ACTION_UP:
			autoScrollifNeed(x);
			break;
		default:
			break;
		}

		return super.onTouchEvent(event);
	}

	private boolean canSliding(MotionEvent event) {
		int[] location = new int[2];
		mRightView.getLocationOnScreen(location);
		RectF region = new RectF();
		region.set(location[0], location[1], location[0] + mRightView.getWidth(), location[1]
				+ mRightView.getHeight());

		boolean isRegion = region.contains(event.getRawX(), event.getRawY());
		return isRegion;
	}

	private void scrollIfNeed(final int x) {
		int deltaX = x - mLastX;

		if (x != mLastX) {
			int l = mRightView.getLeft();
			int t = mRightView.getTop();
			int b = mRightView.getBottom();

			int rightViewleft = Math.max(mLeftView.getLeft(), l + deltaX);
			rightViewleft = Math.min(mLeftView.getRight(), rightViewleft);
			mRightView.layout(rightViewleft, t, rightViewleft + mRightView.getWidth(), b);

		}
		mLastX = x;
	}

	private void autoScrollifNeed(final int x) {
		mScrollRunnable = new ScrollRunnable();
		final int deltaX = x - mMotionX;
		boolean moveLeft = deltaX <= 0;

		final int distance = Math.abs(deltaX);

		if (distance < mLeftView.getWidth() / 2) {
			moveLeft = !moveLeft;
		}
		mScrollRunnable.startScroll(moveLeft);
	}

	private class ScrollRunnable implements Runnable {
		private Scroller mScroller = new Scroller(getContext());

		@Override
		public void run() {
			// TODO Auto-generated method stub
			final Scroller scroller = mScroller;

			boolean more = scroller.computeScrollOffset();
			final int x = scroller.getCurrX();
			if (more) {
				scrollIfNeed(x);
				post(this);
			} else {
				endScroll();
			}
		}

		private void startScroll(boolean moveLeft) {
			mLastX = mRightView.getLeft();

			int dx = 0;

			if (moveLeft) {
				dx = mLeftView.getLeft() - mRightView.getLeft();
			} else {
				dx = mLeftView.getRight() - mRightView.getLeft();
			}
			mScroller.startScroll(mRightView.getLeft(), 0, dx, 0, 300);
			post(this);
		}

		private void endScroll() {
			removeCallbacks(this);
		}
	}

}