【IMOOC学习笔记】多种多样的App主界面Tab实现方法(二)

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);
}

}