Question

我有2个片段：ls_fragment和pm_fragment。我试图在纵向模式下显示pm_fragment，在横向模式下显示两个片段，但我的代码不起作用。在纵向模式下它可以工作，但在横向模式下它只显示一个片段。

MainActivity代码：

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Configuration config = getResources().getConfiguration();

    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction =
            fragmentManager.beginTransaction();

    LM_Fragment lm_fragment = new LM_Fragment();
    PM_Fragment pm_fragment = new PM_Fragment();

    /**
     * Check the device orientation and act accordingly
     */
    if (config.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        /**
         * Landscape mode of the device
         */
        fragmentTransaction.replace(android.R.id.content, lm_fragment);
        fragmentTransaction.add(android.R.id.content, pm_fragment);
    }else{
        /**
         * Portrait mode of the device
         */
        fragmentTransaction.replace(android.R.id.content, pm_fragment);
    }
    fragmentTransaction.commit();
}
}

和LM_Fragment类（PM_Fragment类也一样）：

public class LM_Fragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    /**
     * Inflate the layout for this fragment
     */
    return inflater.inflate(R.layout.lm_fragment, container, false);
} 
}

activity_main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">

<framelayout
    android:name="com.example.myfragments.LM_Fragment"
    android:id="@+id/lm_fragment"
    android:layout_weight="1"
    android:layout_width="0dp"
    android:layout_height="match_parent" />

<framelayout
    android:name="com.example.myfragments.PM_Fragment"
    android:id="@+id/pm_fragment"
    android:layout_weight="2"
    android:layout_width="0dp"
    android:layout_height="match_parent" />

</LinearLayout>

lm_fragment.xml（pm_fragment.xml也一样）;

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#7bae16">

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/landscape_message"
android:textColor="#000000"
android:textSize="20px" />

<!-- More GUI components go here  -->

</LinearLayout>

Answer 1

这可能会对你有帮助。

我刚刚更新了你的代码并且它有效。

import android.content.res.Configuration;
import android.support.v4.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
/**
 * Created by Ravi on 09/07/16.
 */
public class Test12 extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test123);

        Configuration config = getResources().getConfiguration();

        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction =
                fragmentManager.beginTransaction();

        MyFrag1 ls_fragment = new Myfrag1();
        Myfrag2 pm_fragment = new Myfrag2();

        /**
         * Check the device orientation and act accordingly
         */
        if (config.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            /**
             * Landscape mode of the device
             */
            fragmentTransaction.replace(R.id.containerView1, ls_fragment);
            fragmentTransaction.replace(R.id.containerView2, pm_fragment);
        }else{
            /**
             * Portrait mode of the device
             */
            fragmentTransaction.replace(R.id.containerView1, pm_fragment);
        }
        fragmentTransaction.commit();
    }
}

xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/containerView1"
        android:layout_width="210dp"
        android:layout_height="wrap_content"
        android:orientation="vertical"/>

    <FrameLayout
        android:id="@+id/containerView2"
        android:layout_width="210dp"
        android:layout_height="wrap_content"
        android:orientation="vertical"/>

</LinearLayout>

Answer 2

您只需要在MainActivity代码的下方删除。

fragmentTransaction.add(android.R.id.content, pm_fragment)

我猜您在活动类中放错了这段代码，因为当您检查设备的方向是横向时，您正在用android.R.id.content替换lm_fragment。

如何在一个活动中包含2个片段

2 个答案: