如何在Android中從一個Fragment向另一個Fragment傳遞資料?
此示例演示如何在Android中從一個Fragment向另一個Fragment傳遞資料。
步驟 1 − 在Android Studio中建立一個新專案,轉到檔案 ⇒ 新建專案,並填寫所有必需的詳細資訊以建立新專案。
步驟 2 − 將以下程式碼新增到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>
在上面的程式碼中,我們使用了Fragment來在兩個Fragment之間傳遞資料。
步驟 3 − 將以下程式碼新增到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);
}
}步驟 4 − 將以下程式碼新增到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");
}
});
}
}步驟 5 − 將以下程式碼新增到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);
}
}步驟 6 − 將以下程式碼新增到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>
步驟 7 − 將以下程式碼新增到src/OnButtonPressListener.java。
<?xml version = "1.0" encoding = "utf-8"?>
public interface OnButtonPressListener {
public void onButtonPressed(String msg);
}讓我們嘗試執行您的應用程式。我假設您已將您的實際Android移動裝置連線到您的計算機。要在Android Studio中執行該應用程式,請開啟您的專案中的一個活動檔案,然後單擊執行
工具欄中的圖示。選擇您的移動裝置作為選項,然後檢查您的移動裝置,它將顯示您的預設螢幕 –

現在點選第一個Fragment的TextView,它將顯示如下所示的結果 –

點選這裡下載專案程式碼
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