【IMOOC学习笔记】多种多样的App主界面Tab实现方法(二)

Fragment实现Tab

首先把activity_main.xml 文件中的ViewPager标签改成Fragment标签

     <FrameLayout
         android:id="@+id/id_content"
         android:layout_width="fill_parent"
         android:layout_height="0dp"
         android:layout_weight="1" >
     </FrameLayout>

其他的xml文件都跟上一篇中一样，就不重复了。

与之前的ViewPager不同的是，我们还要为每个tab新建一个相应的Fragment类，并且在Fragment类中填充视图

如下：

package com.imooc.tab02;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class WeixinFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.tab01, container, false);
    }
}

最后看看MainActivity类

package com.imooc.tab02;

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.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends FragmentActivity implements OnClickListener {
    private LinearLayout mTabWeixin;
    private LinearLayout mTabFrd;
    private LinearLayout mTabAddress;
    private LinearLayout mTabSettings;

    private ImageButton mImgWeixin;
    private ImageButton mImgFrd;
    private ImageButton mImgAddress;
    private ImageButton mImgSettings;

    private Fragment mTab01;
    private Fragment mTab02;
    private Fragment mTab03;
    private Fragment mTab04;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        initView();
        initEvent();
        setSelect(0);
    }

    private void initEvent() {
        mTabWeixin.setOnClickListener(this);
        mTabFrd.setOnClickListener(this);
        mTabAddress.setOnClickListener(this);
        mTabSettings.setOnClickListener(this);
    }

    private void initView() {
        mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
        mTabFrd = (LinearLayout) findViewById(R.id.id_tab_frd);
        mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
        mTabSettings = (LinearLayout) findViewById(R.id.id_tab_settings);

        mImgWeixin = (ImageButton) findViewById(R.id.id_tab_weixin_img);
        mImgFrd = (ImageButton) findViewById(R.id.id_tab_frd_img);
        mImgAddress = (ImageButton) findViewById(R.id.id_tab_address_img);
        mImgSettings = (ImageButton) findViewById(R.id.id_tab_settings_img);
    }

    private void setSelect(int i) {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();
        hideFragment(transaction);
        switch (i) {
        case 0:
            if (mTab01 == null) {
                mTab01 = new WeixinFragment();
                transaction.add(R.id.id_content, mTab01);
            } else {
                transaction.show(mTab01);
            }
            mImgWeixin.setImageResource(R.drawable.tab_weixin_pressed);
            break;
        case 1:
            if (mTab02 == null) {
                mTab02 = new FrdFragment();
                transaction.add(R.id.id_content, mTab02);
            } else {
                transaction.show(mTab02);

            }
            mImgFrd.setImageResource(R.drawable.tab_find_frd_pressed);
            break;
        case 2:
            if (mTab03 == null) {
                mTab03 = new AddressFragment();
                transaction.add(R.id.id_content, mTab03);
            } else {
                transaction.show(mTab03);
            }
            mImgAddress.setImageResource(R.drawable.tab_address_pressed);
            break;
        case 3:
            if (mTab04 == null) {
                mTab04 = new SettingFragment();
                transaction.add(R.id.id_content, mTab04);
            } else {
                transaction.show(mTab04);
            }
            mImgSettings.setImageResource(R.drawable.tab_settings_pressed);
            break;

        default:
            break;
        }

        transaction.commit();
    }

    private void hideFragment(FragmentTransaction transaction) {
        if (mTab01 != null) {
            transaction.hide(mTab01);
        }
        if (mTab02 != null) {
            transaction.hide(mTab02);
        }
        if (mTab03 != null) {
            transaction.hide(mTab03);
        }
        if (mTab04 != null) {
            transaction.hide(mTab04);
        }
    }

    @Override
    public void onClick(View v) {
        resetImgs();
        switch (v.getId()) {
        case R.id.id_tab_weixin:
            setSelect(0);
            break;
        case R.id.id_tab_frd:
            setSelect(1);
            break;
        case R.id.id_tab_address:
            setSelect(2);
            break;
        case R.id.id_tab_settings:
            setSelect(3);
            break;

        default:
            break;
        }
    }

    private void resetImgs() {
        mImgWeixin.setImageResource(R.drawable.tab_weixin_normal);
        mImgFrd.setImageResource(R.drawable.tab_find_frd_normal);
        mImgAddress.setImageResource(R.drawable.tab_address_normal);
        mImgSettings.setImageResource(R.drawable.tab_settings_normal);
    }

}