Fragment

轉載時請記得標明源地址：http://my.oschina.net/lijindou/blog/718799

本人博客地址：  http://my.oschina.net/lijindou/blog

下面 是我的效果圖

這個 就是效果圖

下面的  mainactivity 的 代碼

import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.content.ContextCompat;
import android.widget.RadioButton;
import android.widget.RadioGroup;



import java.util.ArrayList;
import java.util.List;

public class MainActivity extends FragmentActivity implements RadioGroup.OnCheckedChangeListener {


    /**
     * 按鈕的沒選中顯示的圖標
     * <p>
     */
    private int[] unselectedIconIds = {R.mipmap.zimo,
            R.mipmap.ziyue,
            R.mipmap.luyin,
            R.mipmap.zhibo,
            R.mipmap.me};
    /**
     * 按鈕的選中顯示的圖標
     */
    private int[] selectedIconIds = {R.mipmap.zimo1,
            R.mipmap.ziyue1,
            R.mipmap.luyin1,
            R.mipmap.zhibo1,
            R.mipmap.me1};
//存放fragment的集合
    private List<Fragment> fragments = new ArrayList<Fragment>();
    private RadioGroup rg_main;
    private Main_zimo_fragment zimoFragment;
    private Main_me_fragment meFragment;
    private RadioButton rb_main_zimo;
    private RadioButton rb_main_me;
//    用來存放RadioButton的集合
    private List<RadioButton> radioButtons = new ArrayList<>();
    private RadioButton rb_main_ziyue;
    private RadioButton rb_main_translate;
    private RadioButton rb_main_channel;
    private Main_ziyue_fragment ziyueFragment;
    private Main_translate_fragment translateFragment;
    private Main_channel_fragment channelFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rg_main = (RadioGroup) findViewById(R.id.rg_main);
//        Android單選鈕的點擊事件
        rg_main.setOnCheckedChangeListener(this);

        rb_main_zimo = (RadioButton) findViewById(R.id.rb_main_zimo);
        rb_main_ziyue = (RadioButton) findViewById(R.id.rb_main_ziyue);
        rb_main_translate = (RadioButton) findViewById(R.id.rb_main_translate);
        rb_main_channel = (RadioButton) findViewById(R.id.rb_main_channel);
        rb_main_me = (RadioButton) findViewById(R.id.rb_main_me);

        initData();
        initFragment();

    }

    private void initData() {
//        將按鈕添加到集合中去
        radioButtons.add(rb_main_zimo);
        radioButtons.add(rb_main_ziyue);
        radioButtons.add(rb_main_translate);
        radioButtons.add(rb_main_channel);
        radioButtons.add(rb_main_me);

    }

    private void initFragment() {
//        new出各個Fragment
        zimoFragment = new Main_zimo_fragment();
        ziyueFragment = new Main_ziyue_fragment();
        translateFragment = new Main_translate_fragment();
        channelFragment = new Main_channel_fragment();
        meFragment = new Main_me_fragment();
//        將其添加到一個list集合中
        fragments.add(zimoFragment);
        fragments.add(ziyueFragment);
        fragments.add(translateFragment);
        fragments.add(channelFragment);
        fragments.add(meFragment);

        // 設置默認顯示的碎片
        // 創建一個碎片管理器
        FragmentManager manager = getSupportFragmentManager();
        // 創建一個事物
        FragmentTransaction transaction = manager.beginTransaction();
        // 將我們的碎片添加到佈局上（參數1：要顯示碎片的控件ID,參數2：要顯示的碎片）
        RadioButton radioButton;
        for (int i = 0; i < radioButtons.size(); i++) {
            radioButton = radioButtons.get(i);
            Drawable yellow = null;
            if (i == 0) {
                yellow = ContextCompat.getDrawable(MainActivity.this, selectedIconIds[i]);
            } else {
                yellow = ContextCompat.getDrawable(MainActivity.this, unselectedIconIds[i]);
            }
            yellow.setBounds(0, 0, yellow.getMinimumWidth(), yellow.getMinimumHeight());
            radioButton.setCompoundDrawables(null, yellow, null, null);
            if (i == 0) {
                radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_on));
            } else {
                radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_off));
            }
        }

        transaction.replace(R.id.fl_main_show, fragments.get(0));
        transaction.commit();

    }


    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // 創建一個碎片管理器
        FragmentManager manager = getSupportFragmentManager();
        // 創建一個事物
        FragmentTransaction transaction = manager.beginTransaction();
        Drawable yellow = null;
        RadioButton radioButton = null;
        switch (checkedId) {
            case R.id.rb_main_zimo:// 子墨
                // 將我們的碎片添加到佈局上（參數1：要顯示碎片的控件ID,參數2：要顯示的碎片）
                transaction.replace(R.id.fl_main_show, fragments.get(0));
                for (int i = 0; i < radioButtons.size(); i++) {
                    radioButton = radioButtons.get(i);
                    if (i == 0) {
                        yellow = ContextCompat.getDrawable(MainActivity.this, selectedIconIds[i]);
                    } else {
                        yellow = ContextCompat.getDrawable(MainActivity.this, unselectedIconIds[i]);
                    }
                    yellow.setBounds(0, 0, yellow.getMinimumWidth(), yellow.getMinimumHeight());
                    radioButton.setCompoundDrawables(null, yellow, null, null);
                    if (i == 0) {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_on));
                    } else {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_off));
                    }
                }
                break;
            case R.id.rb_main_ziyue:// 子曰
                for (int i = 0; i < radioButtons.size(); i++) {
                    radioButton = radioButtons.get(i);
                    if (i == 1) {
                        yellow = ContextCompat.getDrawable(MainActivity.this, selectedIconIds[i]);
                    } else {
                        yellow = ContextCompat.getDrawable(MainActivity.this, unselectedIconIds[i]);
                    }
                    yellow.setBounds(0, 0, yellow.getMinimumWidth(), yellow.getMinimumHeight());
                    radioButton.setCompoundDrawables(null, yellow, null, null);
                    if (i == 1) {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_on));
                    } else {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_off));
                    }
                }

                transaction.replace(R.id.fl_main_show, fragments.get(1));
                break;
            case R.id.rb_main_translate:// 翻譯
                for (int i = 0; i < radioButtons.size(); i++) {
                    radioButton = radioButtons.get(i);
                    if (i == 2) {
                        yellow = ContextCompat.getDrawable(MainActivity.this, selectedIconIds[i]);
                    } else {
                        yellow = ContextCompat.getDrawable(MainActivity.this, unselectedIconIds[i]);
                    }
                    yellow.setBounds(0, 0, yellow.getMinimumWidth(), yellow.getMinimumHeight());
                    radioButton.setCompoundDrawables(null, yellow, null, null);
                    if (i == 2) {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_on));
                    } else {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_off));
                    }
                }
                transaction.replace(R.id.fl_main_show, fragments.get(2));
                break;
            case R.id.rb_main_channel:// 頻道
                for (int i = 0; i < radioButtons.size(); i++) {
                    radioButton = radioButtons.get(i);
                    if (i == 3) {
                        yellow = ContextCompat.getDrawable(MainActivity.this, selectedIconIds[i]);
                    } else {
                        yellow = ContextCompat.getDrawable(MainActivity.this, unselectedIconIds[i]);
                    }
                    yellow.setBounds(0, 0, yellow.getMinimumWidth(), yellow.getMinimumHeight());
                    radioButton.setCompoundDrawables(null, yellow, null, null);
                    if (i == 3) {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_on));
                    } else {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_off));
                    }
                }
                transaction.replace(R.id.fl_main_show, fragments.get(3));
                break;
            case R.id.rb_main_me:// 我
                for (int i = 0; i < radioButtons.size(); i++) {
                    radioButton = radioButtons.get(i);
                    if (i == 4) {
                        yellow = ContextCompat.getDrawable(MainActivity.this, selectedIconIds[i]);
                    } else {
                        yellow = ContextCompat.getDrawable(MainActivity.this, unselectedIconIds[i]);
                    }
                    yellow.setBounds(0, 0, yellow.getMinimumWidth(), yellow.getMinimumHeight());
                    radioButton.setCompoundDrawables(null, yellow, null, null);
                    if (i == 4) {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_on));
                    } else {
                        radioButton.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.main_text_off));
                    }
                }
                transaction.replace(R.id.fl_main_show, fragments.get(4));
                break;
            default:
                break;
        }
        transaction.commit();
    }
}

大家看看 ，我的想法 很簡單  ，就是每次 點擊 下面的選項 的時候，放一次 圖片，自己感覺 這個好 浪費 資源 的  就像問下，有沒有什麼可以優化的！！！

這是 這個 fragment 的源碼：http://pan.baidu.com/s/1i4MlZLF

補充 20160904 

這個我上面的代碼在切換Fragment 的時候  是 用replace()切換的 ， 切一次就new  一個 Fragment  不得不說這是一個婁的方式，這樣不僅在每次切換的時候就要new一個，很是浪費資源，並且，如果你的Fragment中有網絡請求，那麼，每切一次就要訪問網絡一次，那麼，對於用戶是一個很不好的體驗，我再網上找了這方面的資料，發現其實Fragment提供了這方面的方法 

add()   如果你的  Fragment 沒有new，那麼用這個 添加

hide()  用於隱藏Fragment 

show() 用於顯示

代碼沒有在現在的電腦上，在公司，等到了公司了，有時間  ，就給大家貼上！！！

20160905  補充

今天從公司將代碼考回來了，寫的DEMO  沒有找到，這個是從我的項目中扣得代碼

主要的代碼 是：

// 將我們的碎片添加到佈局上（參數1：要顯示碎片的控件ID,參數2：要顯示的碎片）
if (!fragments.get(0).isAdded()) {    // 先判斷是否被add過
    Log.e(TAG, "onCheckedChanged:0+ ");
    transaction.hide(fragments.get(1)).hide(fragments.get(2)).hide(fragments.get(3)).hide(fragments.get(4)).add(R.id.fl_main_show, fragments.get(0)).show(fragments.get(0)).commit(); // 隱藏當前的fragment，add下一個到Activity中
} else {
    Log.e(TAG, "onCheckedChanged:0 -");
    transaction.hide(fragments.get(1)).hide(fragments.get(2)).hide(fragments.get(3)).hide(fragments.get(4)).show(fragments.get(0)).commit(); // 隱藏當前的fragment，顯示下一個
}

主要 實現的  方法就是我上面說的  那三個方法