Fragment 页面切换不能滑动 所以对于listview 能够加入的左右滑动事件 。不会有冲突比如(QQ的好友列表的删除)
Fragment 和viewpager 的差别Viewpager 的事件都须要写在 MainActivity 使得 MainActivity 类很冗余
Fragment 内部的事件则能够由其内部去处理分成多个类。
便于维护和管理 MainActivity 仅仅起到一个调度的作用
这里先用Fragment实现非滑动页面切换,了解原理后我会在还有一篇文章使用Fragment+viewPager加上滑动效果
第一步:创建AndroidprojectFragmentPage
这时会自己主动生成一个MainActivity.java
和一个相应的activity_main.xml文件
在layout目录下创建四个xml文件:
tab1.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/imag1" android:orientation="vertical" > </LinearLayout>
tab2.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/image2" android:orientation="vertical" > </LinearLayout>
tab3.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/image3" android:orientation="vertical" > </LinearLayout>
bottom.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="45dp" android:orientation="horizontal" > <TextView android:id="@+id/text1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1.0" android:gravity="center" android:text="标题1" android:textColor="#000000" android:textSize="18.0dip" /> <TextView android:id="@+id/text2" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1.0" android:gravity="center" android:text="标题2" android:textColor="#000000" android:textSize="18.0dip" /> <TextView android:id="@+id/text3" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1.0" android:gravity="center" android:text="标题3" android:textColor="#000000" android:textSize="18.0dip" /> </LinearLayout>
在src下的自己主动生成的包下创建三个java文件:
Fragment1
注意:导入包时一定要导入:import android.support.v4.app.FragmentActivity;
这个包。
这是Android4.0之后才支持的版本号
4.0之前不支持这个包(有另外一个专门的包)
package com.example.fragmentpage; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment1 extends Fragment { private View tab1view; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub tab1view=inflater.inflate(R.layout.tab1, container, false); return tab1view; } }
Fragment2
package com.example.fragmentpage; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment2 extends Fragment { private View tabview1; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub tabview1 = inflater.inflate(R.layout.tab2, container,false); return tabview1; } }
Fragment3
package com.example.fragmentpage; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment3 extends Fragment{ private View tab3view ; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub tab3view = inflater.inflate(R.layout.tab3, container, false); return tab3view; } }
第四步:
在MainActivity中写入
package com.example.fragmentpage; import android.os.Bundle; import android.app.Activity; 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.text.method.HideReturnsTransformationMethod; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.TextView; public class MainActivity extends FragmentActivity implements OnClickListener{ private TextView t1; private TextView t2; private TextView t3; private Fragment tab1; private Fragment tab2; private Fragment tab3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); initView();//依据Id索引组件 initEvent();//加入监听 setSelect(0);// } private void initEvent() { t1.setOnClickListener(this); t2.setOnClickListener(this); t3.setOnClickListener(this); } private void initView() { t1 = (TextView) findViewById(R.id.text1); t2 = (TextView) findViewById(R.id.text2); t3 = (TextView) findViewById(R.id.text3); } /* * 重置textView的内容 * */ private void reset() { t1.setText("标题1"); t2.setText("标题2"); t3.setText("标题3"); } private void setSelect(int i) { // TODO Auto-generated method stub FragmentManager fm=getSupportFragmentManager(); FragmentTransaction trs = fm.beginTransaction(); //隐藏Fragment hideFragment(trs);//使所有隐藏 switch(i){ case 0: if(tab1 == null){ tab1 = new Fragment1();//创建Fragment1的对象(一个页面) trs.add(R.id.id_content,tab1); } else { trs.show(tab1);//使当前Activity显示tab1即Fragment1页面 } t1.setText("选中"); break; case 1: if(tab2 == null){ tab2 = new Fragment2(); trs.add(R.id.id_content, tab2); }else{ trs.show(tab2); } t2.setText("选中"); break; case 2: if(tab3 == null){ tab3 = new Fragment3(); trs.add(R.id.id_content, tab3); }else { trs.show(tab3); } t3.setText("选中"); break; default: break; } trs.commit(); } @Override public void onClick(View v) {//监听事件 // TODO Auto-generated method stub reset(); switch(v.getId()){ case R.id.text1: setSelect(0); break; case R.id.text2: setSelect(1); break; case R.id.text3: setSelect(2); break; default: break; } } private void hideFragment(FragmentTransaction trs) { // TODO Auto-generated method stub if(tab1!=null){ trs.hide(tab1); } if(tab2!=null) { trs.hide(tab2); } if(tab3!=null) { trs.hide(tab3); } } }