Android Fragment实例2 _fragment

非淡泊无以明志，非宁静无以致远。这篇文章主要讲述Android Fragment实例2相关的知识，希望能为你提供帮助。
由于看客的要求，我就把读者所要的写出来。
由于上一篇是每一个Fragment 实例了同一个layout.xml ，造成了读者的困惑，这篇我就让每一个Fragment 加载一个不同的layout.xml.
首先我们要准备四个layout.xml ，用来给每个点击跳转页面。
第一个fg_contnet.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="@color/cornsilk" android:orientation="vertical" > < TextView android:id="@+id/txt_content" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="第一个" android:textColor="@android:color/holo_green_light" android:textSize="20sp"/> < /LinearLayout>

第二个fg_contnet2.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="@color/cornsilk" android:gravity="center_vertical" android:orientation="vertical" > < TextView android:id="@+id/txt_content" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="第二个" android:textColor="@android:color/holo_green_light" android:textSize="20sp"/> < Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Load。。。。" /> < /LinearLayout>

第三个 fg_content3.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="@color/cornsilk" android:orientation="vertical" > < ImageView android:layout_width="match_parent" android:layout_height="wrap_content" android:src="https://www.songbingjia.com/android/@drawable/ic_launcher" /> < /LinearLayout>

第四个 fg_content4.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="@color/cornsilk" android:orientation="vertical" > < TimePicker android:id="@+id/timePicker1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> < /LinearLayout>

因为要每个Fragemnt 加载一个layout.xml ，所以MyFragment 也要修改：
【Android Fragment实例2】我们在构造器中传入一个content_layout.xml ,动态改变FragmentLayout.

import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class MyFragment extends Fragment{ private int content_layout; public MyFragment(int content) { this.content_layout = content; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(content_layout,container,false); return view; } }

最后在MainActivity 中：

import android.app.Activity; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.View; import android.view.Window; import android.widget.TextView; public class MainActivity extends Activity implements View.OnClickListener{//UI Object private TextView txt_channel; private TextView txt_message; private TextView txt_better; private TextView txt_setting; //Fragment Object private MyFragment fg1,fg2,fg3,fg4; private FragmentManager fManager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); fManager = getFragmentManager(); bindViews(); txt_channel.performClick(); //模拟一次点击，既进去后选择第一项 }//UI组件初始化与事件绑定 private void bindViews() { txt_channel = (TextView) findViewById(R.id.txt_channel); txt_message = (TextView) findViewById(R.id.txt_message); txt_better = (TextView) findViewById(R.id.txt_better); txt_setting = (TextView) findViewById(R.id.txt_setting); txt_channel.setOnClickListener(this); txt_message.setOnClickListener(this); txt_better.setOnClickListener(this); txt_setting.setOnClickListener(this); }//重置所有文本的选中状态 private void setSelected(){ txt_channel.setSelected(false); txt_message.setSelected(false); txt_better.setSelected(false); txt_setting.setSelected(false); }//隐藏所有Fragment private void hideAllFragment(FragmentTransaction fragmentTransaction){ if(fg1 != null)fragmentTransaction.hide(fg1); if(fg2 != null)fragmentTransaction.hide(fg2); if(fg3 != null)fragmentTransaction.hide(fg3); if(fg4 != null)fragmentTransaction.hide(fg4); }@Override public void onClick(View v) { FragmentTransaction fTransaction = fManager.beginTransaction(); hideAllFragment(fTransaction); switch (v.getId()){ case R.id.txt_channel: setSelected(); txt_channel.setSelected(true); if(fg1 == null){ fg1 = new MyFragment(R.layout.fg_content); fTransaction.add(R.id.ly_content,fg1); }else{ fTransaction.show(fg1); } break; case R.id.txt_message: setSelected(); txt_message.setSelected(true); if(fg2 == null){ fg2 = new MyFragment(R.layout.fg_content2); fTransaction.add(R.id.ly_content,fg2); }else{ fTransaction.show(fg2); } break; case R.id.txt_better: setSelected(); txt_better.setSelected(true); if(fg3 == null){ fg3 = new MyFragment(R.layout.fg_content3); fTransaction.add(R.id.ly_content,fg3); }else{ fTransaction.show(fg3); } break; case R.id.txt_setting: setSelected(); txt_setting.setSelected(true); if(fg4 == null){ fg4 = new MyFragment(R.layout.fg_content4); fTransaction.add(R.id.ly_content,fg4); }else{ fTransaction.show(fg4); } break; } fTransaction.commit(); } }

最后看一下效果：