Fragment的使用

FragmeLayout的使用

xml布局

Activity内展示fragment

 

public class MainActivity extends FragmentActivity {

 

 

    private FrameLayout zhan;

    private RadioGroup gr;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //找控件

        initView();

        //设置初始fragment页面

        getSupportFragmentManager().beginTransaction().

                replace(R.id.zhan,new Fragment1()).commit();

 

        gr.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override

            public void onCheckedChanged(RadioGroup radioGroup, int i) {

                switch (i){

                    case R.id.shouye:

                        getSupportFragmentManager().beginTransaction().

                                replace(R.id.zhan,new Fragment1()).commit();

                        break;

                    case R.id.xigua:

                        getSupportFragmentManager().beginTransaction().

                                replace(R.id.zhan,new Fragment2()).commit();

                        break;

                    case R.id.wei:

                        getSupportFragmentManager().beginTransaction().

                                replace(R.id.zhan,new Fragment3()).commit();

                        break;

                    case R.id.wode:

                        getSupportFragmentManager().beginTransaction().

                                replace(R.id.zhan,new Fragment4()).commit();

                        break;

                }

            }

        });

    }

 

    private void initView() {

        zhan = findViewById(R.id.zhan);

        gr = findViewById(R.id.gr);

    }

 

}

fragment的显示与隐藏

public class MainActivity extends FragmentActivity {

 

    private Fragment2 fragment2;

    private Fragment1 fragment1;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        fragment2 = new Fragment2();

        fragment1 = new Fragment1();

        // 如果想要做显示和隐藏的操作,,,必须在Fragment的栈里面添加Fragment

        getSupportFragmentManager().beginTransaction()

                .add(R.id.framelayout, fragment1).commit();

        getSupportFragmentManager().beginTransaction()

                .add(R.id.framelayout, fragment2).commit();

    }

 

    /**

     * 显示Fragment1

     */

    public void show(View view) {

        // 创建Fragment管理者,,,并开启事务

        FragmentTransaction transaction = getSupportFragmentManager()

                .beginTransaction();

        transaction.show(fragment1);

        transaction.hide(fragment2);

        transaction.commit();

    }

 

    /**

     * 隐藏Fragment1

     */

    public void hide(View view) {

        // 创建Fragment管理者,,,并开启事务

        FragmentTransaction transaction = getSupportFragmentManager()

                .beginTransaction();

        transaction.hide(fragment1);

        transaction.show(fragment2);

        transaction.commit();

    }

 

}

fragment传值

            Bundle b=new Bundle();

            String urls = myTabs.get(position).getUrls();

            b.putString("key",urls);

            b.putString("pageIndex","1");

            v_fragment v_fragment=new v_fragment();

            v_fragment.setArguments(b);

 

fragment接收值

Bundle  bundle = getArguments();

        if (bundle !=null){

              key_url = bundle.getString("key");

           

        }

<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.wangwenda20171201_week1.MainActivity">       <FrameLayout         android:id="@+id/zhan"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_alignParentLeft="true"         android:layout_alignParentStart="true"         android:layout_above="@id/gr">       </FrameLayout>       <RadioGroup         android:id="@+id/gr"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_alignParentBottom="true"         android:orientation="horizontal">           <RadioButton             android:id="@+id/shouye"             android:layout_width="0dp"             android:layout_height="match_parent"             android:layout_weight="1"             android:button="@null"             android:gravity="center"             android:padding="10dp"             android:text="URLconnection" />           <RadioButton             android:id="@+id/xigua"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:layout_weight="1"             android:button="@null"             android:gravity="center"             android:padding="10dp"             android:text="HttpClient" />           <RadioButton             android:id="@+id/wei"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:layout_weight="1"             android:button="@null"             android:gravity="center"             android:padding="10dp"             android:text="WIFI状态" />           <RadioButton             android:id="@+id/wode"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:layout_weight="1"             android:button="@null"             android:gravity="center"             android:padding="10dp"             android:text="蓝牙状态" />       </RadioGroup>   </RelativeLayout>

            Bundle b=new Bundle();

            String urls = myTabs.get(position).getUrls();

            b.putString("key",urls);

            b.putString("pageIndex","1");

            v_fragment v_fragment=new v_fragment();

            v_fragment.setArguments(b);