XListViewHeader.java

package com.bigdo.controls;

import com.bigdo.app.R;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class XListViewHeader extends LinearLayout {
	private LinearLayout mContainer;
	private RelativeLayout mExtension;
	private ImageView mArrowImageView;
	private ProgressBar mProgressBar;
	private TextView mHintTextView;
	private int mState = STATE_NORMAL;

	private Animation mRotateUpAnim;
	private Animation mRotateDownAnim;

	private final int ROTATE_ANIM_DURATION = 180;

	public final static int STATE_NORMAL = 0;
	public final static int STATE_READY = 1;
	public final static int STATE_REFRESHING = 2;

	public XListViewHeader(Context context) {
		super(context);
		initView(context);
	}

	/**
	 * @param context
	 * @param attrs
	 */
	public XListViewHeader(Context context, AttributeSet attrs) {
		super(context, attrs);
		initView(context);
	}

	private void initView(Context context) {
		setFocusable(true);
		// setFocusableInTouchMode(true);
		// setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
		try {
			mContainer = (LinearLayout) LayoutInflater.from(context).inflate(
					R.layout.xlistview_header, null);
			LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
					LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
			addView(mContainer, lp);
			mContainer = (LinearLayout) findViewById(R.id.xlistview_header_content_host);
			mExtension = (RelativeLayout) findViewById(R.id.xlistview_header_extension_content_host);
			LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(
					LayoutParams.FILL_PARENT, 0);
			mContainer.setLayoutParams(lp1);
			setGravity(Gravity.BOTTOM);
			mArrowImageView = (ImageView) findViewById(R.id.xlistview_header_arrow);
			mHintTextView = (TextView) findViewById(R.id.xlistview_header_hint_textview);
			mProgressBar = (ProgressBar) findViewById(R.id.xlistview_header_progressbar);

			mRotateUpAnim = new RotateAnimation(0.0f, -180.0f,
					Animation.RELATIVE_TO_SELF, 0.5f,
					Animation.RELATIVE_TO_SELF, 0.5f);
			mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION);
			mRotateUpAnim.setFillAfter(true);
			mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f,
					Animation.RELATIVE_TO_SELF, 0.5f,
					Animation.RELATIVE_TO_SELF, 0.5f);
			mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION);
			mRotateDownAnim.setFillAfter(true);
		} catch (Exception e) {
		}
	}

	public void setState(int state) {
		if (state == mState) {
			return;
		}
		if (state == STATE_REFRESHING) {
			mArrowImageView.clearAnimation();
			mArrowImageView.setVisibility(View.GONE);
			mProgressBar.setVisibility(View.VISIBLE);
		} else {
			mArrowImageView.setVisibility(View.VISIBLE);
			mProgressBar.setVisibility(View.GONE);
		}

		switch (state) {
		case STATE_NORMAL:
			if (mState == STATE_READY) {
				mArrowImageView.startAnimation(mRotateDownAnim);
			}
			if (mState == STATE_REFRESHING) {
				mArrowImageView.clearAnimation();
			}
			mHintTextView.setText(R.string.xlistview_header_hint_normal);
			break;
		case STATE_READY:
			if (mState != STATE_READY) {
				mArrowImageView.clearAnimation();
				mArrowImageView.startAnimation(mRotateUpAnim);
				mHintTextView.setText(R.string.xlistview_header_hint_ready);
			}
			break;
		case STATE_REFRESHING:
			mHintTextView.setText(R.string.xlistview_header_hint_refreshing);
			break;
		default:
		}

		mState = state;
	}

	public void setVisiableHeight(int height) {
		if (height < 0) {
			height = 0;
		}
		LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContainer
				.getLayoutParams();
		lp.height = height;
		mContainer.setLayoutParams(lp);

	}

	public int getVisiableHeight() {
		return mContainer.getHeight();
	}

	public int getWindowTop() {
		int[] location = { 0, 0 };
		mContainer.getLocationInWindow(location);
		return location[1];
	}

	public void addExtensionView(View v) {
		if (v == null) {
			mExtension.removeAllViews();
		} else {
			mExtension.removeAllViews();
			mExtension.addView(v);
		}

	}

}