自定义ProgressBar---跟随进度的 Popwindow

项目需求的一个效果请看图

这种效果实现的方式基本思路 seekbar+popwindow，当更新进度的时候同时更新popwindow的位置即可，废话不多说直接上代码

主Activity

package com.seekbar.demo;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;

public class SeekBarDemoActivity extends Activity {
	
	private ManaMySeekBar mSeekBar;
	private int mProgress;
	private LinearLayout mLlMain;

	@SuppressLint("HandlerLeak")
	private Handler handler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			mProgress += 1;
			if (mProgress <= 100) {
				mSeekBar.setProgress(mProgress);
				mSeekBar.setSeekBarText(mProgress + "%");
			}

		};
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		initView();
		setEventListener();
		initData();

	}

	/**
	 * 初始化控件
	 */
	private void initView() {
		mLlMain = (LinearLayout) findViewById(R.id.ll_main);

	}

	/**
	 * 设置监听
	 */
	private void setEventListener() {

	}

	/**
	 * 填充数据
	 */
	private void initData() {
		//1.创建seekbar
		//2.并给seekbar添加项目需求的样式属性等等，最后别忘了设置属性方法setLayout(params)
		//3.隐藏seekbar的Thumb并设置max的最大值
		//4.塞进父布局中
		mSeekBar = new ManaMySeekBar(this);
		LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
				LayoutParams.MATCH_PARENT, 30);
		params.leftMargin = 70;
		params.rightMargin = 70;
		mSeekBar.setLayoutParams(params);
		mSeekBar.setThumb(getResources().getDrawable(android.R.color.transparent));
		mSeekBar.setMax(100);
		mLlMain.addView(mSeekBar);
		
		mProgress = 0;
		
		//这里在子线程中睡200毫秒是为了防止seekbar加载前，布局还没有加载完成，导致找不到Activity工程崩溃
		new Thread() {
			public void run() {
				SystemClock.sleep(200);
				startThread();
			};
		}.start();

	}

	/**
	 * 模拟下载数据
	 */
	private void startThread() {
		new Thread() {
			@Override
			public void run() {
				super.run();
				while (mProgress <= 100) {
					SystemClock.sleep(200);
					handler.sendEmptyMessage(0);
				}

			}
		}.start();

	}
}

自定义的SeekBar

package com.seekbar.demo;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.TextView;

public class CusSeekBar extends SeekBar {
	private PopupWindow mPopupWindow;

	private LayoutInflater mInflater;
	private View mView;
	private int[] mPosition;

	private Context mContext;

	private final int mThumbWidth = 25;
	private TextView mTvProgress;

	private int mWidth;
	private int mHeight;
	int mProgress;
	int mViewWidth;
	int mDX;
	int mOneStep;
	int mStartX;

	public CusSeekBar(Context context) {
		super(context);
		init(context);
	}

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

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

	private void init(Context context) {
		mContext = context;
		mInflater = LayoutInflater.from(context);
		mView = mInflater.inflate(R.layout.popwindow_layout, null);
		mTvProgress = (TextView) mView.findViewById(R.id.tvPop);
		mPopupWindow = new PopupWindow(mView, mView.getWidth(),
				mView.getHeight(), true);
		mPosition = new int[2];
		WindowManager wm = (WindowManager) mContext
				.getSystemService(Context.WINDOW_SERVICE);

		mWidth = wm.getDefaultDisplay().getWidth();
		mHeight = wm.getDefaultDisplay().getHeight();

		mViewWidth = getWidth();
		mDX = mWidth - mViewWidth;
		mOneStep = mViewWidth / getMax();
		mStartX = mWidth - mDX / 2;
	}

	public void setSeekBarText(String str) {
		mTvProgress.setText(str);
		mProgress = getProgress();
		mPopupWindow.showAsDropDown(this, mStartX + mOneStep * mProgress, mHeight - 30);
	}

	private int getViewWidth(View v) {
		int w = View.MeasureSpec.makeMeasureSpec(0,
				View.MeasureSpec.UNSPECIFIED);
		int h = View.MeasureSpec.makeMeasureSpec(0,
				View.MeasureSpec.UNSPECIFIED);
		v.measure(w, h);
		return v.getMeasuredWidth();
	}

	private int getViewHeight(View v) {
		int w = View.MeasureSpec.makeMeasureSpec(0,
				View.MeasureSpec.UNSPECIFIED);
		int h = View.MeasureSpec.makeMeasureSpec(0,
				View.MeasureSpec.UNSPECIFIED);
		v.measure(w, h);
		return v.getMeasuredHeight();
	}

	@Override
	protected synchronized void onDraw(Canvas canvas) {
		int thumb_x = this.getProgress() * (this.getWidth() - mThumbWidth)
				/ this.getMax();
		int middle = mHeight / 2 - 70;//这里控制pop的Y轴位置
		super.onDraw(canvas);

		if (mPopupWindow != null) {
			try {
				this.getLocationOnScreen(mPosition);
				mPopupWindow.update(thumb_x + mPosition[0]
						- getViewWidth(mView) / 2 + mThumbWidth / 2, middle,
						getViewWidth(mView), getViewHeight(mView));

			} catch (Exception e) {
				
			}
		}

	}

}

源码下载：

http://pan.baidu.com/s/1i3L00SX