fragment入門

MainActivity.java

public class MainActivity extends Activity implements OnClickListener {
    private Button bt_news1, bt_news2, bt_news3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt_news1 = (Button) findViewById(R.id.bt_news1);
        bt_news2 = (Button) findViewById(R.id.bt_news2);
        bt_news3 = (Button) findViewById(R.id.bt_news3);

        bt_news1.setOnClickListener(this);
        bt_news2.setOnClickListener(this);
        bt_news3.setOnClickListener(this);
        
        FragmentManager fm = getFragmentManager();
                    //FragmentManager fm = getSupportFragmentManager();//向下兼容
                    //Fragment需要使用android.support.v4.app.Fragment
        FragmentTransaction ft = fm.beginTransaction(); //開啟事務(wù) 
        ft.replace(R.id.fl_container, new News1Fragment());
        ft.commit();
    }

    @Override
    public void onClick(View v) {
        FragmentManager fm = getFragmentManager();
        FragmentTransaction ft = fm.beginTransaction(); //開啟事務(wù) 
        switch (v.getId()) {
        case R.id.bt_news1:
            Toast.makeText(this, "點(diǎn)擊了社會(huì)新聞", 0).show();
            ft.replace(R.id.fl_container, new News1Fragment());
            break;
        case R.id.bt_news2:
            Toast.makeText(this, "點(diǎn)擊了娛樂新聞", 0).show();
            ft.replace(R.id.fl_container, new News2Fragment());
            break;
        case R.id.bt_news3:
            Toast.makeText(this, "點(diǎn)擊了國(guó)際新聞", 0).show();
            ft.replace(R.id.fl_container, new News3Fragment());
            break;
        }
        ft.commit();
    }
}

News1Fragment.java

//1.不需要在清單文件中配置
//2.擁有與activities一模一樣的生命周期
public class News1Fragment extends Fragment { 
    //返回當(dāng)前fragment顯示的內(nèi)容
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return View.inflate(getActivity(), R.layout.fragment01, null);
    }
}

News2Fragment.java

//1.不需要在清單文件中配置
//2.擁有與activities一模一樣的生命周期
public class News1Fragment extends Fragment { 
    //返回當(dāng)前fragment顯示的內(nèi)容
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return View.inflate(getActivity(), R.layout.fragment02, null);
    }
}

News3Fragment.java

//1.不需要在清單文件中配置
//2.擁有與activities一模一樣的生命周期
public class News1Fragment extends Fragment { 
    //返回當(dāng)前fragment顯示的內(nèi)容
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return View.inflate(getActivity(), R.layout.fragment01, null);
    }
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <FrameLayout
        android:id="@+id/fl_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/bt_news1"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="社會(huì)新聞" />

        <Button
             android:id="@+id/bt_news2"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="娛樂新聞" />

        <Button
             android:id="@+id/bt_news3"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="國(guó)際新聞" />
    </LinearLayout>

</RelativeLayout>

fragment01.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:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是社會(huì)新聞。"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="隔壁鄰居的人咬了狗"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="隔壁鄰居的人咬了黃狗"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="隔壁鄰居的人咬了大白狗"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="隔壁鄰居的人咬了黑狗"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

fragment02.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:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是娛樂新聞。"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="文章干了一個(gè)奇葩的事情"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="且行且珍惜"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="汪峰有新專輯"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="章子怡干了什么事情"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

fragment03.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:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是國(guó)際新聞。"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="奧巴馬喜歡普京"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="奧巴馬覺得。。。"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="xxxx"
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="阿凡達(dá)發(fā)"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
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