package com.mars.mp3player;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class ActivityMain extends TabActivity {
  private TabSpec tabSpec;
  private TabHost tabHost;
  private Intent intent;
  private static final int SWIPE_MIN_DISTANCE = 120;
  private static final int SWIPE_MAX_OFF_PATH = 250;
  private static final int SWIPE_THRESHOLD_VELOCITY = 200;
  private GestureDetector gestureDetector;
  View.OnTouchListener gestureListener;

  int currentView = 0;
  private static int maxTabIndex = 2;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.setContentView(R.layout.activity_main);
    UtilVar.activities.add(ActivityMain.this);
    this.initTableHost();

    gestureDetector = new GestureDetector(new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
      public boolean onTouch(View v, MotionEvent event) {
        if (gestureDetector.onTouchEvent(event)) {
          return true;
        }
        return false;
      }
    };

  }

  /**
   * tablehost的初始化，代码完成
   */
  private void initTableHost() {
    tabHost = super.getTabHost();
    // 歌曲列表
    intent = new Intent(ActivityMain.this, ActivityList.class);
    tabSpec = tabHost
        .newTabSpec("歌曲列表")
        .setIndicator("歌曲列表",
            getResources().getDrawable(R.drawable.ic_launcher))
        .setContent(intent);
    tabHost.addTab(tabSpec);
    // 正在播放
    intent = new Intent(ActivityMain.this, ActivityPlaying.class);
    tabSpec = tabHost
        .newTabSpec("正在播放")
        .setIndicator("正在播放",
            getResources().getDrawable(R.drawable.ic_launcher))
        .setContent(intent);
    tabHost.addTab(tabSpec);
    // 专辑列表
    intent = new Intent(ActivityMain.this, ActivityLyric.class);
    tabSpec = tabHost
        .newTabSpec("歌词显示")
        .setIndicator("歌词显示",
            getResources().getDrawable(R.drawable.ic_launcher))
        .setContent(intent);
    tabHost.addTab(tabSpec);
    // 设置当前tab
    tabHost.setCurrentTab(1);
  }

  // 左右滑动刚好页面也有滑动效果
  class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {
      TabHost tabHost = getTabHost();
      try {
        if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
          return false;
        // right to left swipe
        if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
          Log.i("test", "right");
          if (currentView == maxTabIndex) {
            currentView = 0;
          } else {
            currentView++;
          }
          tabHost.setCurrentTab(currentView);
        } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
          Log.i("test", "left");
          if (currentView == 0) {
            currentView = maxTabIndex;
          } else {
            currentView--;
          }
          tabHost.setCurrentTab(currentView);
        }
      } catch (Exception e) {
      }
      return false;
    }
  }

  @Override
  public boolean dispatchTouchEvent(MotionEvent event) {
    if (gestureDetector.onTouchEvent(event)) {
      event.setAction(MotionEvent.ACTION_CANCEL);
    }
    return super.dispatchTouchEvent(event);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
  }

}
// 主要代码就这样吧，以后就不必到处找手势跳转activity的例子了。