java - 在 fragment 之间传递数据

Question

我正在尝试将data从一个 fragment 的edittext传递到与其他 fragment 关联的textview

<小时/>

我正在遵循在 fragment 之间传递数据的静态方式

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <fragment
        android:id="@+id/fragment2"
        android:name="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="80dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="Click to send data to next Activity" />

</RelativeLayout>

fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="TextView"
        android:textSize="40dp" />

</RelativeLayout>

Fragment1.java

package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;

public class Fragment1 extends Fragment{

    Button button;
    EditText textedit;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        View view=inflater.inflate(R.layout.fragment_1, container, false);

        button=(Button) view.findViewById(R.id.button1);
        textedit=(EditText) view.findViewById(R.id.editText1);


        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                FragmentManager FM = getFragmentManager();
                Fragment2 f2=(Fragment2) FM.findFragmentById(R.id.fragment2);

                f2.setName(textedit.getText().toString());

            }
        });

        return view;
    }


}

Fragment2.java

package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment2 extends Fragment{

    View view;
    TextView txtview;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        view=inflater.inflate(R.layout.fragment_2, container, false);

        return view;
    }


    public void setName(String Name){

        txtview=(TextView) view.findViewById(R.id.textView1);
        txtview.setText("Hello:: " +Name);

    }


}

<小时/>

[编辑]

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <fragment
        android:id="@+id/fragment2"
        class="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <fragment
        android:id="@+id/fragment1"
        class="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Fragment1.java

package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;

public class Fragment1 extends Fragment{

    Button button;
    EditText textedit;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        View view=inflater.inflate(R.layout.fragment_1, container, false);

        button=(Button) view.findViewById(R.id.button1);
        textedit=(EditText) view.findViewById(R.id.editText1);


        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                FragmentManager FM = getActivity().getSupportFragmentManager();
                Fragment2 f2=(Fragment2) FM.findFragmentById(R.id.fragment2);

                f2.setName(textedit.getText().toString());

            }
        });

        return view;
    }


}

日志::

10-30 14:37:32.900: D/AndroidRuntime(460): Shutting down VM
10-30 14:37:32.900: W/dalvikvm(460): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
10-30 14:37:32.940: E/AndroidRuntime(460): FATAL EXCEPTION: main
10-30 14:37:32.940: E/AndroidRuntime(460): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.usingtwofragmentsfornavigatingbetweentwoactivities/com.example.usingtwofragmentsfornavigatingbetweentwoactivities.MainActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.os.Looper.loop(Looper.java:123)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.ActivityThread.main(ActivityThread.java:4627)
10-30 14:37:32.940: E/AndroidRuntime(460):  at java.lang.reflect.Method.invokeNative(Native Method)
10-30 14:37:32.940: E/AndroidRuntime(460):  at java.lang.reflect.Method.invoke(Method.java:521)
10-30 14:37:32.940: E/AndroidRuntime(460):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-30 14:37:32.940: E/AndroidRuntime(460):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-30 14:37:32.940: E/AndroidRuntime(460):  at dalvik.system.NativeStart.main(Native Method)
10-30 14:37:32.940: E/AndroidRuntime(460): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
10-30 14:37:32.940: E/AndroidRuntime(460):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.Activity.setContentView(Activity.java:1647)
10-30 14:37:32.940: E/AndroidRuntime(460):  at com.example.usingtwofragmentsfornavigatingbetweentwoactivities.MainActivity.onCreate(MainActivity.java:12)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
10-30 14:37:32.940: E/AndroidRuntime(460):  ... 11 more
10-30 14:37:32.940: E/AndroidRuntime(460): Caused by: java.lang.ClassNotFoundException: android.view.fragment in loader dalvik.system.PathClassLoader[/data/app/com.example.usingtwofragmentsfornavigatingbetweentwoactivities-2.apk]
10-30 14:37:32.940: E/AndroidRuntime(460):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
10-30 14:37:32.940: E/AndroidRuntime(460):  at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
10-30 14:37:32.940: E/AndroidRuntime(460):  at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.createView(LayoutInflater.java:466)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:544)
10-30 14:37:32.940: E/AndroidRuntime(460):  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
10-30 14:37:32.940: E/AndroidRuntime(460):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
10-30 14:37:32.940: E/AndroidRuntime(460):  ... 20 more

MainActivity.java

package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

如何解决这个问题？

Answer 1

java.lang.ClassNotFoundException: android.view.fragment 

您不是从支持库导入 fragment ，并且您的设备是 Android 3 之前的旧设备。它应该是

import android.support.v4.app.Fragment;

也在您的 xml 更改中

android:name

与

class