ShareActivity.java

package com.zhong.activity;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;

/**
 * 分享页
 * 
 * @author 仲丛旭
 * 
 */
public class ShareActivity extends Activity {
	/** 一个假的背景图片，我看那个原版的也没做这功能。 */
	private ImageView imageView_share_bg;
	/** 判断是否是双击 */
	private boolean isExit = false;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_share);
		imageView_share_bg = (ImageView) findViewById(R.id.imageView_share_bg);
		imageView_share_bg.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				onKeyDown(4, null);

			}
		});
	}

	/*
	 * 菜单、返回键响应(non-Javadoc)
	 * 
	 * @see android.app.Activity#onKeyDown(int, android.view.KeyEvent)
	 */
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			Timer tExit = null;
			if (isExit == false) {
				isExit = true; // 准备退出
				Toast.makeText(this, "功能暂位开通，再按一次返回上一页", Toast.LENGTH_SHORT)
						.show();
				tExit = new Timer();
				tExit.schedule(new TimerTask() {
					@Override
					public void run() {
						isExit = false; // 取消退出
					}
				}, 2000); // 如果2秒钟内没有按下返回键，则启动定时器取消掉刚才执行的任务

			} else {
				this.finish();
				overridePendingTransition(R.anim.push_down_in,
						R.anim.push_down_out);// 上往下推出效果
			}
		}
		return false;
	}
}