Android 如何从我的主要活动中调用 Fragment [英] Android How to call Fragment from my Main Activity

问题描述

我对安卓开发很陌生.

就我而言，我创建了一个主要活动和一个片段.主要活动作为两个按钮.

in my case i have one main activity and one fragment created.Main activity as two buttons.

当我点击按钮时，我的片段应该加载.我该如何实现?

when i click on button, my fragment should load .how can i achieve that?

主要活动.XML

<Button
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
    android:text="Fragment 2"
    android:id="@+id/fragment_button_2"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Fragment 1"
    android:id="@+id/fragment_button_1"
    android:layout_above="@+id/fragment_button_2"
    android:layout_alignLeft="@+id/fragment_button_2"
    android:layout_alignStart="@+id/fragment_button_2"
    android:layout_marginBottom="33dp" />
</RelativeLayout>

主要活动.java

package com.bentgeorge.fragment;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements    View.OnClickListener{
private Button fragment_btn_1;
private Button fragment_btn_2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    fragment_btn_1 = (Button) findViewById(R.id.fragment_button_1);
    fragment_btn_2 = (Button) findViewById(R.id.fragment_button_2);


}

@Override
public void onClick(View v) {

Fragment1 frag = new Fragment1();
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.mainlayout,frag,"Test Fragment");
transaction.commit();

}
}

fragment_fragment1.xml

fragment_fragment1.xml

<FrameLayout 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="com.bentgeorge.fragment.Fragment1">

<!-- TODO: Update blank fragment layout -->
<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="@string/hello_blank_fragment" />

</FrameLayout>

Fragment1.java

Fragment1.java

package com.bentgeorge.fragment;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


/**
* A simple {@link Fragment} subclass.
*/
public class Fragment1 extends Fragment {


public Fragment1() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_fragment1, container,  false);
}

}

没有做太多代码，因为我对互联网上可用的教程感到困惑.

Not done much codes as i am confused with internet available tutorials.

请帮我解决这个问题

谢谢&问候，

更新:

我做了一些更改，我的片段现在正在加载.ut 按钮仍然可见.如何隐藏按钮

i have done some changes and my fragment is getting loaded now. ut the buttons are still visible . How can i hide the buttons

推荐答案

更新:请像这样更改您的 MainActivity:

Updated: Please change your MainActivity as like this:

  public class MainActivity extends AppCompatActivity  {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Fragment fragment = new MainFragment();
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.fragment_frame, fragment, fragment.getClass().getSimpleName()).addToBackStack(null).commit();

        }
    }

像这样改变你的activity_main.xml:

Change your activity_main.xml as like this:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"                
android:id="@+id/fragment_frame"            
android:layout_width="match_parent"
            android:layout_height="match_parent" />

请创建一个xml fragment_main.xml:

Please create an xml fragment_main.xml:

  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"                
                android:layout_width="match_parent"
                android:layout_height="match_parent" >
    <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
        android:text="Fragment 2"
        android:id="@+id/fragment_button_2"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Fragment 1"
        android:id="@+id/fragment_button_1"
        android:layout_above="@+id/fragment_button_2"
        android:layout_alignLeft="@+id/fragment_button_2"
        android:layout_alignStart="@+id/fragment_button_2"
        android:layout_marginBottom="33dp" />
    </RelativeLayout>

同时创建一个片段作为 MainFragment:

Also create a fragment as MainFragment:

public class MainFragment extends Fragment implements View.OnClickListener{
     private Button fragment_btn_1;
        private Button fragment_btn_2;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_main, container, false);
        fragment_btn_1 = (Button) view.findViewById(R.id.fragment_button_1);
            fragment_btn_2 = (Button) view.findViewById(R.id.fragment_button_2);
            fragment_btn_1.setOnClickListener(this);
            fragment_btn_2.setOnClickListener(this);
        return view;
    }
@Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.fragment_button_1:
                    Fragment fragment1 = new Fragment1();
                    moveToFragment(fragment1);
                    break;
                case R.id.fragment_button_2:
                    Fragment fragment2 = new Fragment2();
                    moveToFragment(fragment2);
                    break;
            }
        }

        private void moveToFragment(Fragment fragment) {
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.fragment_frame, fragment, fragment.getClass().getSimpleName()).addToBackStack(null).commit();

        }
}

希望对你有帮助.如果您有任何疑问，请告诉我.

Hope this will helps you. If you had any queries, let me know.

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