如何在Android中从一个Fragment向另一个Fragment传递数据?
此示例演示如何在Android中从一个Fragment向另一个Fragment传递数据。
步骤 1 − 在Android Studio中创建一个新项目,转到文件 ⇒ 新建项目,并填写所有必需的详细信息以创建新项目。
步骤 2 − 将以下代码添加到res/layout/activity_main.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:orientation = "vertical" android:layout_width = "match_parent" android:layout_height = "match_parent"> <LinearLayout android:id = "@+id/linearlayout01" android:layout_width = "fill_parent" android:layout_height = "fill_parent" android:background = "#ccc" android:layout_weight = "1" android:orientation = "vertical"> <fragment android:name = "com.example.myapplication.FirstFragment" android:id = "@+id/frag_1" android:layout_width = "fill_parent" android:layout_height = "fill_parent" /> </LinearLayout> <LinearLayout android:id = "@+id/linearlayout02" android:layout_width = "fill_parent" android:layout_height = "fill_parent" android:layout_weight = "1" android:background = "#eee" android:orientation = "vertical"> <fragment android:name = "com.example.myapplication.SecondFragment" android:id = "@+id/frag_2" android:layout_width = "fill_parent" android:layout_height = "fill_parent" /> </LinearLayout> </LinearLayout>
在上面的代码中,我们使用了Fragment来在两个Fragment之间传递数据。
步骤 3 − 将以下代码添加到src /MainActivity.java
<?xml version = "1.0" encoding = "utf-8"?> import android.os.Bundle; import android.support.v4.app.FragmentActivity; public class MainActivity extends FragmentActivity implements OnButtonPressListener { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public void onButtonPressed(String msg) { // TODO Auto-generated method stub SecondFragment Obj = (SecondFragment) getSupportFragmentManager().findFragmentById(R.id.frag_2); Obj.onFragmentInteraction(msg); } }
步骤 4 − 将以下代码添加到src / FirstFragment.java
<?xml version = "1.0" encoding = "utf-8"?> import android.annotation.SuppressLint; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class FirstFragment extends Fragment{ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment, null); init(root); return root; } OnButtonPressListener buttonListener; @Override public void onAttach(Activity activity) { super.onAttach(activity); try { buttonListener = (OnButtonPressListener) getActivity(); } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement onButtonPressed"); } } void init(ViewGroup root) { TextView but = (TextView)root.findViewById(R.id.text); but.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub buttonListener.onButtonPressed("Message From First Fragment"); } }); } }
步骤 5 − 将以下代码添加到src / SecondFragment.java
<?xml version = "1.0" encoding = "utf-8"?> import android.annotation.SuppressLint; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class SecondFragment extends Fragment { TextView textView; View view; @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { view = inflater.inflate(R.layout.fragment, container, false); return view; } public void onFragmentInteraction(String uri) { Log.d("sai",uri); textView = view.findViewById(R.id.text); textView.setText(uri); } }
步骤 6 − 将以下代码添加到res/layout/fragment.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:gravity = "center" android:layout_height = "match_parent"> <TextView android:id = "@+id/text" android:textSize = "30sp" android:text = "Click" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> </LinearLayout>
步骤 7 − 将以下代码添加到src/OnButtonPressListener.java。
<?xml version = "1.0" encoding = "utf-8"?> public interface OnButtonPressListener { public void onButtonPressed(String msg); }
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要在Android Studio中运行该应用程序,请打开您的项目中的一个活动文件,然后单击运行 工具栏中的图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕 –
现在点击第一个Fragment的TextView,它将显示如下所示的结果 –
点击这里下载项目代码
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