如何在Android Studio中从一个活动导航到另一个活动的片段？

Question

我有个错误

 public void on_Image_Button_9_Clicked(View view)
    {
        Intent click 5=new Intent(home.this,category 2.class);
        start Activity(click 5);
    }

//类别2是片段

Answer 1

你的方法是错误的。要访问片段，需要创建FragmentTransaction。

我邀请您阅读这篇关于片段如何工作以防止使用它的任何坏习惯的指南。

因此，要么调用包含所需片段的活动，要么将片段加载到当前容器中。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment android:name="com.example.news.ArticleListFragment"
        android:id="@+id/list"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="match_parent" />
<fragment android:name="com.example.news.ArticleReaderFragment"
        android:id="@+id/viewer"
        android:layout_weight="2"
        android:layout_width="0dp"
        android:layout_height="match_parent" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout android:id="@+id/myContainer"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

 public class MyActivity extends AppCompatActivity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.myActivity_layout);
            setFragment()
        }


        public void setFragment() {
            // Create new fragment and transaction
            Fragment newFragment = new ExampleFragment();
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

            // Replace whatever is in the fragment_container view with this fragment, and add the transaction to the back stack
            transaction.replace(R.id.myContainer, newFragment);
            transaction.addToBackStack(null);

            // Commit the transaction
            transaction.commit();
        }
    }