android - 在android中使用简单的片段

Question

我正在研究android中的简单片段

---

片段_1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/Yellow" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="This is the fragment part"
        android:textSize="25dp" />

</RelativeLayout>

片段1.java

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{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        View view=inflater.inflate(R.layout.fragment_1, container, false);


        return view;
    }



}

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.simplestfragment.Fragment1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

}

我得到的输出为::

• 如我们所见，片段的左右和顶部有空格

• 如何删除它们以获得如下输出

Answer 1

从布局中删除填充。

<RelativeLayout 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"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.simplestfragment.Fragment1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

</RelativeLayout>

Answer 2

删除此行..

android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"

Answer 3

**activity_main.xml**

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mukundwn.fragments.MainActivity">


    <ListView
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:id="@+id/listview"/>

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="190dp"/>



</RelativeLayout>


**MainActivity.java**

public class MainActivity extends AppCompatActivity {
    ListView lv;
    String days[]={"Modi","Rajnikanth","BinLaden","Mukund"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       lv=(ListView)findViewById(R.id.listview);
        ArrayAdapter<String> ada=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,days);
        lv.setAdapter(ada);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                TextView txt = (TextView) view;


               // Toast.makeText(getApplicationContext(), "u have selected " + txt.getText(), Toast.LENGTH_SHORT).show();
                if( ((TextView) view).getText().toString().equals("Modi"))
                    loadFragment(new BlankFragment());
                if(txt.getText().toString().equals("Rajnikanth"))
                    loadFragment(new BlankFragment2());
                if(txt.getText().toString().equals("BinLaden"))
                    loadFragment(new BlankFragment3());
                else if(txt.getText().toString().equals("Mukund"))
                    loadFragment(new BlankFragment4());
            }
        });

    }

//    private void loadFragment(Fragment fragment)
//    {
//        android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
//        FragmentTransaction fragmentTransaction = fm.beginTransaction();
//        fragmentTransaction.replace(R.id.frameLayout, fragment);
//        fragmentTransaction.commit();
//    }

    public void loadFragment(Fragment fragment)
    {
        FragmentManager fm=getSupportFragmentManager();
        FragmentTransaction fragmentTransaction=fm.beginTransaction();
        fragmentTransaction.replace(R.id.frameLayout,fragment);
        fragmentTransaction.commit();
    }

}