fragment实现隐藏及界面切换效果

package com.crazy.gemi;
 
import android.app.SearchManager;
import android.content.Intent;
import android.graphics.Color;
import android.provider.SearchRecentSuggestions;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.TextView;
 
import com.crazy.gemi.ui.cheaper.CheaperFragment;
import com.crazy.gemi.ui.cheaper.SearchSuggestionSampleProvider;
import com.crazy.gemi.ui.favor.FavorFragment;
import com.crazy.gemi.ui.more.MoreFragment;
import com.crazy.gemi.ui.near.NearFragment;
import com.crazy.gemi.ui.pocket.PocketFragment;
 
public class MainActivity extends FragmentActivity
    implements View.OnClickListener, CheaperFragment.SearchResult{
 
  private TextView[] textView = new TextView[5];
  private View[] views = new View[5];
  // 其中的 firstFragment 相当于是个中间变量
  private Fragment firstFragment, nearFragment, cheaperFragment, favorFragment, pocketFragmnet, moreFragment;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 
    init();
    initFragment();
  }
 
  private void init() {
 
    textView[0] = (TextView)findViewById(R.id.near);
    textView[1] = (TextView)findViewById(R.id.search_cheaper);
    textView[2] = (TextView)findViewById(R.id.favor);
    textView[3] = (TextView)findViewById(R.id.pocket);
    textView[4] = (TextView)findViewById(R.id.more);
 
    views[0] = findViewById(R.id.near_top_line);
    views[1] = findViewById(R.id.cheaper_top_line);
    views[2] = findViewById(R.id.favor_top_line);
    views[3] = findViewById(R.id.pocket_top_line);
    views[4] = findViewById(R.id.more_top_line);
 
    textView[0].setOnClickListener(this);
    textView[1].setOnClickListener(this);
    textView[2].setOnClickListener(this);
    textView[3].setOnClickListener(this);
    textView[4].setOnClickListener(this);
 
  }
 
  private void initFragment() {
    firstFragment = FavorFragment.newInstance();
    favorFragment = firstFragment;
    // 最先加载的 fragment
    getSupportFragmentManager().beginTransaction().
        add(R.id.frame_layout, favorFragment).commit();
    textView[2].setTextColor(Color.BLACK);
    views[2].setBackgroundColor(Color.parseColor("#FF6600"));
  }
 
  @Override
  public void onClick(View v) {
    switch (v.getId()) {
      case R.id.near:
//        getSupportFragmentManager().beginTransaction().
//            replace(R.id.frame_layout, NearFragment.newInstance()).commit();
 
        if(nearFragment==null){
          nearFragment= NearFragment.newInstance();
        }
        switchContent(firstFragment, nearFragment, getSupportFragmentManager().beginTransaction());
        firstFragment = nearFragment;
 
        selectStringAndBackgroundColor(0);
        break;
      case R.id.search_cheaper:
        if(cheaperFragment==null){
          cheaperFragment= CheaperFragment.newInstance();
        }
        switchContent(firstFragment, cheaperFragment, getSupportFragmentManager().beginTransaction());
        firstFragment = cheaperFragment;
 
        selectStringAndBackgroundColor(1);
        break;
      case R.id.favor:
        if(favorFragment==null){
          favorFragment= FavorFragment.newInstance();
        }
        switchContent(firstFragment, favorFragment, getSupportFragmentManager().beginTransaction());
        firstFragment = favorFragment;
 
        selectStringAndBackgroundColor(2);
        break;
      case R.id.pocket:
        if(pocketFragmnet==null){
          pocketFragmnet= PocketFragment.newInstance();
        }
        switchContent(firstFragment, pocketFragmnet, getSupportFragmentManager().beginTransaction());
        firstFragment = pocketFragmnet;
 
        selectStringAndBackgroundColor(3);
        break;
      case R.id.more:
        if(moreFragment==null){
          moreFragment= MoreFragment.newInstance();
        }
        switchContent(firstFragment, moreFragment, getSupportFragmentManager().beginTransaction());
        firstFragment = moreFragment;
 
        selectStringAndBackgroundColor(4);
        break;
    }
  }
 
  /**
   * 通过 position 的位置改变文字和 View 的颜色
   * @param position
   */
  private void selectStringAndBackgroundColor(int position){
    int sum = textView.length;
    for (int i = 0; i < sum; i++) {
      if (position == i) {
        textView[i].setTextColor(Color.BLACK);
        views[i].setBackgroundColor(Color.parseColor("#FF6600"));
      } else {
        textView[i].setTextColor(Color.GRAY);
        views[i].setBackgroundColor(Color.parseColor("#f0f0f0"));
      }
    }
  }
 
  /**
   * 判断是否添加了界面，以保存当前状态
   */
  public void switchContent(Fragment from, Fragment to,
               FragmentTransaction transaction) {
 
    if (!to.isAdded()) { // 先判断是否被add过
 
      transaction.hide(from).add(R.id.frame_layout, to)
          .commit(); // 隐藏当前的fragment，add下一个到Activity中
    } else {
      transaction.hide(from).show(to).commit(); // 隐藏当前的fragment，显示下一个
    }
 
  }
 
  
}