RadioButton点击切换,默认显示页面

public class MainActivityextends AppCompatActivityimplements View.OnClickListener {

private RadioButtonrb;

private RadioButtonrb1;

private BFragmentbFragment;

private FragmentManagermanager;

private AFragmentaFragment;

private final StringSHOUYETAG ="f1";

private FrameLayouttv_fragment;

private FragmentTransactiontransaction;

@Override

    protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

}

private void initView() {

tv_fragment = (FrameLayout) findViewById(R.id.tv_fragment);

tv_fragment.setOnClickListener(this);

rb = (RadioButton) findViewById(R.id.rb);

rb1 = (RadioButton) findViewById(R.id.rb1);

rb.setOnClickListener(this);

rb1.setOnClickListener(this);

manager = getSupportFragmentManager();

aFragment = (AFragment)manager.findFragmentByTag(SHOUYETAG);

FragmentTransaction fragmentTransaction =manager.beginTransaction();

if (aFragment ==null) {

AFragment aFragment =new AFragment();

fragmentTransaction.add(R.id.tv_fragment, aFragment,SHOUYETAG);

fragmentTransaction.commit();

}

}

private void initFragment(Fragment fragment) {

FragmentManager supportFragmentManager = getSupportFragmentManager();

transaction = supportFragmentManager.beginTransaction();

transaction.replace(R.id.tv_fragment, fragment);

transaction.commit();

}

@Override

    public void onClick(View view) {

switch (view.getId()) {

case R.id.rb:

aFragment =new AFragment();

initFragment(aFragment);

break;

case R.id.rb1:

bFragment =new BFragment();

initFragment(bFragment);

break;

}

}

}

奇迹布局

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="@color/white">

        android:id="@+id/content"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_above="@id/fg" />

        android:id="@+id/fg"

        android:layout_width="match_parent"

        android:layout_height="0.1dp"

        android:layout_above="@id/rg"

        android:background="#E3E3E3" />

        android:id="@+id/rg"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_margin="@dimen/dp_5"

        android:orientation="horizontal">

            android:id="@+id/rb1"

            android:layout_width="@dimen/dp_0"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:background="@color/white"

            android:button="@null"

            android:drawableTop="@drawable/button_shouye"

            android:gravity="center"

            android:text="首页" />

            android:id="@+id/rb2"

            android:layout_width="@dimen/dp_0"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:background="#ffffff"

            android:button="@null"

            android:drawableTop="@drawable/button_souke"

            android:gravity="center"

            android:text="搜课" />

            android:id="@+id/rb3"

            android:layout_width="@dimen/dp_0"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:background="#ffffff"

            android:button="@null"

            android:gravity="center"

            android:text="今日直播" />

            android:id="@+id/rb4"

            android:layout_width="@dimen/dp_0"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:background="#ffffff"

            android:button="@null"

            android:drawableTop="@drawable/button_cache"

            android:gravity="center"

            android:text="缓存" />

            android:id="@+id/rb5"

            android:layout_width="@dimen/dp_0"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:background="#ffffff"

            android:button="@null"

            android:drawableTop="@drawable/button_my"

            android:gravity="center"

            android:text="我的" />

        android:id="@+id/cb"

        android:layout_width="wrap_content"

        android:layout_height="48dp"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true"

        android:layout_marginBottom="24dp"

        android:button="@null"

        android:drawableTop="@drawable/button_live" />

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