android主界面tab切换方式
16lz
2021-01-23
原文（很不错的三种tab界面切换）：https://www.cnblogs.com/caobotao/p/5103673.html
我用的是第三种方式：使用 ViewPager + Fragment
BaseActivity
package com.dream;import android.support.v7.app.AppCompatActivity;import android.view.KeyEvent;import android.widget.Toast;public class BaseActivity extends AppCompatActivity { private long exitTime = 0; /** * 拦截返回键 * @param keyCode * @param event * @return */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){ if((System.currentTimeMillis()-exitTime) > 2000){ Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show(); exitTime = System.currentTimeMillis(); } else { finish();// JActivityManager.getInstance().closeAllActivity(); System.exit(0); } return true; } return super.onKeyDown(keyCode, event); }}HomeActivity
package com.dream;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.Window;import android.widget.LinearLayout;import android.widget.TextView;import com.dream.home.Tab1Fragment;import com.dream.home.Tab2Fragment;import com.dream.home.Tab3Fragment;import java.util.ArrayList;import java.util.List;public class HomeActivity extends BaseActivity implements View.OnClickListener { //声明ViewPager private ViewPager mViewPager; //适配器 private FragmentPagerAdapter mAdapter; //装载Fragment的集合 private List mFragments; //3个Tab对应的布局 private LinearLayout mTab1; private LinearLayout mTab2; private LinearLayout mTab3; //3个Tab对应的ImageButton private TextView mImg1; private TextView mImg2; private TextView mImg3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); // 指定布局界面 setContentView(R.layout.activity_home); // 隐藏操作栏 getSupportActionBar().hide(); initViews();//初始化控件 initEvents();//初始化事件 initDatas();//初始化数据 } private void initDatas() { mFragments = new ArrayList<>(); //将3个Fragment加入集合中 mFragments.add(new Tab1Fragment()); mFragments.add(new Tab2Fragment()); mFragments.add(new Tab3Fragment()); //初始化适配器 mAdapter = new FragmentPagerAdapter(getSupportFragmentManager()) { @Override public Fragment getItem(int position) {//从集合中获取对应位置的Fragment return mFragments.get(position); } @Override public int getCount() {//获取集合中Fragment的总数 return mFragments.size(); } }; //不要忘记设置ViewPager的适配器 mViewPager.setAdapter(mAdapter); //设置ViewPager的切换监听 mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override //页面滚动事件 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } //页面选中事件 @Override public void onPageSelected(int position) { //设置position对应的集合中的Fragment mViewPager.setCurrentItem(position); resetImgs(); selectTab(position); } @Override //页面滚动状态改变事件 public void onPageScrollStateChanged(int state) { } }); } private void initEvents() { //设置三个Tab的点击事件 mTab1.setOnClickListener(this); mTab2.setOnClickListener(this); mTab3.setOnClickListener(this); } //初始化控件 private void initViews() { mViewPager = (ViewPager) findViewById(R.id.id_viewpager); mTab1 = (LinearLayout) findViewById(R.id.linear_tab1); mTab2 = (LinearLayout) findViewById(R.id.linear_tab2); mTab3 = (LinearLayout) findViewById(R.id.linear_tab3); mImg1 = (TextView) findViewById(R.id.tab_1); mImg2 = (TextView) findViewById(R.id.tab_2); mImg3 = (TextView) findViewById(R.id.tab_3); } @Override public void onClick(View v) { //先将四个ImageButton置为灰色 resetImgs(); //根据点击的Tab切换不同的页面及设置对应的ImageButton为绿色 switch (v.getId()) { case R.id.linear_tab1: selectTab(0); break; case R.id.linear_tab2: selectTab(1); break; case R.id.linear_tab3: selectTab(2); break; } } private void selectTab(int i) { //根据点击的Tab设置对应的ImageButton为绿色 TextView title = (TextView)findViewById(R.id.top_title); switch (i) { case 0: title.setText("tab1"); mImg1.setTextColor(this.getResources().getColor(R.color.green)); break; case 1: title.setText("tab2"); mImg2.setTextColor(this.getResources().getColor(R.color.green)); break; case 2: title.setText("tab3"); mImg3.setTextColor(this.getResources().getColor(R.color.green)); break; } //设置当前点击的Tab所对应的页面 mViewPager.setCurrentItem(i); } //将四个ImageButton设置为灰色 private void resetImgs() { mImg1.setTextColor(this.getResources().getColor(R.color.gray)); mImg2.setTextColor(this.getResources().getColor(R.color.gray)); mImg3.setTextColor(this.getResources().getColor(R.color.gray)); }} 各个tab对应的Fragment
Tab1Fragment
public class Tab1Fragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.home_tab1, container, false); return view; }}Tab2Fragment
public class Tab2Fragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.home_tab2, container, false); return view; }}Tab3Fragment
public class Tab3Fragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.home_tab3, container, false); return view; }}界面布局文件 activity_home.xml
<?xml version="1.0" encoding="utf-8"?>
顶部布局文件 home_top.xml
<?xml version="1.0" encoding="utf-8"?> 底部布局文件 home_bottom.xml
<?xml version="1.0" encoding="utf-8"?> 三个tab对应的布局文件
home_tab1.xml
<?xml version="1.0" encoding="utf-8"?>home_tab2.xml
<?xml version="1.0" encoding="utf-8"?> home_tab3.xml
<?xml version="1.0" encoding="utf-8"?>
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