Fragment 使用

Fragment感觉有点像VUE的组件，今天研究了一下。成果如下

新建两个 Fragment 文件 并设置对应的布局

public class BlankFragment1 extends Fragment { 

    private String TAG = BlankFragment1.class.getSimpleName();

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_blank1, container, false);
        TextView f1_id = view.findViewById(R.id.f1_id);
        Bundle bundle = getArguments();
        String Id = "";
        if(bundle!=null)
        {
            Id = bundle.getString("Id");
        }
        f1_id.setText(Id);
        return view;
    }
}

布局文件

<LinearLayout 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"
    android:orientation="horizontal"
    tools:context="com.yysoft.Frames.BlankFragment1">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textSize="18sp"
        android:id="@+id/f1_id"
        android:text="farm1" />
</LinearLayout>

新建一个Activity文件，做为启动界面

布局文件

<?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=".MainActivity2">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/top1"
        android:orientation="horizontal"
        >
        <TextView
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:textStyle="bold"
            android:text="第一个页面11"
            android:gravity="center"
            android:id="@+id/tv1"
            >

        </TextView>
        <View android:layout_width="1dp"
            android:layout_height="match_parent"
            android:background="@color/black"
            ></View>
        <TextView
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:textStyle="bold"
            android:text="第二个页面22"
            android:gravity="center"
            android:id="@+id/tv2"
            >
        </TextView>

    </LinearLayout>
    <View android:layout_width="match_parent"
        android:layout_height="1dp"
        android:id="@+id/vv1"
        android:layout_below="@id/top1"
        android:background="@color/black"
        ></View>
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fv1"
        android:layout_below="@id/vv1"></FrameLayout>

</RelativeLayout>

主文件

private TextView tv1;
    private TextView tv2;
    private Fragment curFrageMent;
    private String TAG = MainActivity2.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        tv1 = findViewById(R.id.tv1);
        tv2 = findViewById(R.id.tv2);

        tv1.setOnClickListener(this);
        tv2.setOnClickListener(this);
        showFm(1);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.tv1:
                showFm(1);
                break;
            case R.id.tv2:
                showFm(2);
                break;
            default:break;
        }
    }

    private void showFm(int i){
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
　　　　 //传值用的
        Bundle bundle = new Bundle();
        switch (i)
        {
            case 1:
                curFrageMent = new BlankFragment1();
                bundle.putString("Id","123456");
                break;
            case 2:
                curFrageMent = new BlankFragment2();
                bundle.putString("Id","654321");
                break;
        }
        Log.i(TAG, "showFm: "+curFrageMent.getClass().getSimpleName());
        if(curFrageMent!=null) {
            curFrageMent.setArguments(bundle); //传值
            transaction.replace(R.id.fv1, curFrageMent);
            transaction.commit();
        }
    }

另外，组件之间传值时，可以通过activity传，比如在第二个碎片化里面写上方法，在第一个中调用时可以使用。

 private void setContent(String title, String content) {
        ContentFragment contentFragment = (ContentFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.fra_content);
        contentFragment.setData(title,content);
    }