Jetpack Navigation - 在 Fragment 中跳转到 Activity（4 种方式） - 详解

一、使用 startActivity 跳转

1、Fragment Layout

• fragment_test.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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=".fragment.TestFragment"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="TestFragment"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/btn_jump"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="跳转"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

2、Activity Code

• TestFragment.xml

public class TestFragment
extends Fragment {
public static final String TAG = TestFragment.class.
getSimpleName();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_test, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Button btnJump = view.findViewById(R.id.btn_jump);
btnJump.setOnClickListener(v ->
{
Intent intent = new Intent(getActivity(), Test2Activity.class)
;
startActivity(intent);
});
}
}

3、Activity Layout

• activity_test1.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".Test1Activity"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Test1Activity"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><fragmentandroid:name="com.my.navigation.fragment.TestFragment"android:layout_width="match_parent"android:layout_height="300dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

• activity_test2.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".Test1Activity"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Test2Activity"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/btn_back"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="返回"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

4、Activity Code

• Test1Activity.java

public class Test1Activity
extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_test1);
ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) ->
{
Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
return insets;
});
}
}

• Test2Activity.java

public class Test2Activity
extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_test2);
ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) ->
{
Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
return insets;
});
Button btnBack = findViewById(R.id.btn_back);
btnBack.setOnClickListener(v ->
{
finish();
});
}
}

---

二、使用 Activity Result API 跳转

1、Fragment Code

• TestFragment.java

ActivityResultLauncher<
Intent> activityResultLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
result ->
{
if (result.getResultCode() == Activity.RESULT_OK) {
Intent data = result.getData();
int num = data.getIntExtra("num", 0);
Log.i(TAG, "num: " + num);
}
}
);
Button btnJump = view.findViewById(R.id.btn_jump);
btnJump.setOnClickListener(v ->
{
Intent intent = new Intent(getActivity(), Test2Activity.class)
;
activityResultLauncher.launch(intent);
});

2、Activity Code

• Test2Activity.java

Button btnBack = findViewById(R.id.btn_back);
btnBack.setOnClickListener(v ->
{
Intent intent = new Intent();
intent.putExtra("num", 100);
setResult(RESULT_OK, intent);
finish();
});

---

三、使用 startActivityForResult 方法跳转

1、Fragment Code

• TestFragment.java

private static final int REQUEST_CODE = 100;

@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK) {
int num = data.getIntExtra("num", 0);
Log.i(TAG, "num: " + num);
}
}
}

Button btnJump = view.findViewById(R.id.btn_jump);
btnJump.setOnClickListener(v ->
{
Intent intent = new Intent(getActivity(), Test2Activity.class)
;
startActivityForResult(intent, REQUEST_CODE);
});

2、Activity Code

• Test2Activity.java

Button btnBack = findViewById(R.id.btn_back);
btnBack.setOnClickListener(v ->
{
Intent intent = new Intent();
intent.putExtra("num", 100);
setResult(RESULT_OK, intent);
finish();
});

---

四、使用 Navigation 跳转

1、Fragment Layout

• fragment_test.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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=".fragment.TestFragment"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="TestFragment"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/btn_jump"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="跳转"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

2、Fragment Code

• TestFragment.java

public class TestFragment
extends Fragment {
public static final String TAG = TestFragment.class.
getSimpleName();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_test, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
NavController navController = Navigation.findNavController(view);
Button btnJump = view.findViewById(R.id.btn_jump);
btnJump.setOnClickListener(v ->
{
navController.navigate(R.id.action_testFragment_to_test2Activity);
});
}
}

3、Navigation Graph

• test_graph_navigation.xml

<?xml version="1.0" encoding="utf-8"?><navigation 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:id="@+id/test_graph_navigation"app:startDestination="@id/testFragment"><fragmentandroid:id="@+id/testFragment"android:name="com.my.navigation.fragment.TestFragment"android:label="fragment_test"tools:layout="@layout/fragment_test"><actionandroid:id="@+id/action_testFragment_to_test2Activity"app:destination="@id/test2Activity" />
</fragment>
<activityandroid:id="@+id/test2Activity"android:name="com.my.navigation.Test2Activity"android:label="Test2Activity" />
</navigation>

4、Activity Layout

• activity_test1.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".Test1Activity"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Test1Activity"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><fragmentandroid:id="@+id/nhf"android:name="androidx.navigation.fragment.NavHostFragment"android:layout_width="match_parent"android:layout_height="300dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:navGraph="@navigation/test_graph_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>

• activity_test2.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".Test1Activity"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Test2Activity"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/btn_back"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="返回"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

5、Activity Code

• Test1Activity.java

public class Test1Activity
extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_test1);
ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) ->
{
Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
return insets;
});
}
}

• Test2Activity.java

public class Test2Activity
extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_test2);
ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) ->
{
Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
return insets;
});
Button btnBack = findViewById(R.id.btn_back);
btnBack.setOnClickListener(v ->
{
finish();
});
}
}