EDIT ::: Vui lòng tham khảo câu trả lời của tôi dưới đây ...Làm thế nào để sử dụng mảnh vỡ trong Android
Câu hỏi :::
Tôi rất mới để sử dụng mảnh vỡ trong Android và tôi hoàn toàn sai lầm.
Tôi chỉ đang cố xây dựng một ứng dụng mẫu đơn giản sử dụng Phân đoạn. Kịch bản của tôi là, tôi có hai mảnh trong hoạt động chính của mình. Đoạn đầu tiên có một văn bản và một nút. Đoạn thứ hai có một textview. Khi tôi nhập tên trong văn bản và nhấp vào nút, khung nhìn văn bản trong đoạn thứ hai sẽ hiển thị tên được nhập trong phần văn bản của đoạn đầu tiên.
Tôi đang sử dụng phân bổ tĩnh các đoạn (gán các đoạn trong XML).
Vui lòng tham khảo các tập tin XML và Mã dưới đây ...
activity_main.XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/fragment_content_1"
android:name="com.example.fragmentexample.fragment_fragment_1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</fragment>
<fragment
android:id="@+id/fragment_content_2"
android:name="com.example.fragmentexample.fragment_fragment_2"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<!-- Preview: [email protected]/fragment_basic -->
</fragment>
</LinearLayout>
fragment_fragment_1.XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/edtxtPersonName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
<Button
android:id="@+id/btnSayHi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Say Hi" />
</LinearLayout>
fragment_fragment_2.XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtViewResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I will say Hi" />
</LinearLayout>
Java tập tin :::
MainActivity.Java
package com.example.fragmentexample;
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.activity_main, menu);
return true;
}
}
Fragment_1.Java
package com.example.fragmentexample;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
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;
import android.widget.Toast;
public class Fragment_1 extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment_fragment_1, container, false);
final EditText edtxtPersonName_Fragment = (EditText) view.findViewById(R.id.edtxtPersonName);
Button btnSayHi_Fragment = (Button) view.findViewById(R.id.btnSayHi);
btnSayHi_Fragment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name = edtxtPersonName_Fragment.getText().toString();
FragmentManager fm = getFragmentManager();
Fragment_2 f2 = (Fragment_2) fm.findFragmentById(R.id.fragment_content_2);
if(f2 != null && f2.isInLayout())
{
f2.setName(name);
}
Activity activity = getActivity();
if(activity != null)
{
Toast.makeText(activity, "Say&ing Hi in Progress...", Toast.LENGTH_LONG).show();
}
}
});
return view;
}
}
Fragment_2.Java
package com.example.fragmentexample;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment_2 extends Fragment{
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view = inflater.inflate(R.layout.fragment_fragment_2, container, false);
return view;
}
public void setName(String name)
{
TextView txtName = (TextView) view.findViewById(R.id.txtViewResult);
txtName.setText("Hi " + name);
}
}
Khi tôi chạy các ứng dụng, có cả nhiều ngoại lệ .. Đây là dấu vết logcat ..
04-16 15:06:48.781: E/AndroidRuntime(420): FATAL EXCEPTION: main
04-16 15:06:48.781: E/AndroidRuntime(420): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentexample/com.example.fragmentexample.MainActivity}: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.access$500(ActivityThread.java:122)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.os.Looper.loop(Looper.java:132)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.main(ActivityThread.java:4123)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.reflect.Method.invokeNative(Native Method)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.reflect.Method.invoke(Method.java:491)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-16 15:06:48.781: E/AndroidRuntime(420): at dalvik.system.NativeStart.main(Native Method)
04-16 15:06:48.781: E/AndroidRuntime(420): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.inflate(LayoutInflater.java:391)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.inflate(LayoutInflater.java:347)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:223)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Activity.setContentView(Activity.java:1786)
04-16 15:06:48.781: E/AndroidRuntime(420): at com.example.fragmentexample.MainActivity.onCreate(MainActivity.java:12)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Activity.performCreate(Activity.java:4397)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
04-16 15:06:48.781: E/AndroidRuntime(420): ... 11 more
04-16 15:06:48.781: E/AndroidRuntime(420): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.fragmentexample.fragment_fragment_1: make sure class name exists, is public, and has an empty constructor that is public
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Fragment.instantiate(Fragment.java:567)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Fragment.instantiate(Fragment.java:535)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Activity.onCreateView(Activity.java:4168)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664)
04-16 15:06:48.781: E/AndroidRuntime(420): ... 21 more
04-16 15:06:48.781: E/AndroidRuntime(420): Caused by: java.lang.ClassNotFoundException: com.example.fragmentexample.fragment_fragment_1 in loader dalvik.system.PathClassLoader[/data/app/com.example.fragmentexample-1.apk]
04-16 15:06:48.781: E/AndroidRuntime(420): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.ClassLoader.loadClass(ClassLoader.java:540)
04-16 15:06:48.781: E/AndroidRuntime(420): at java.lang.ClassLoader.loadClass(ClassLoader.java:500)
04-16 15:06:48.781: E/AndroidRuntime(420): at android.app.Fragment.instantiate(Fragment.java:557)
04-16 15:06:48.781: E/AndroidRuntime(420): ... 24 more
Tôi đã xem các ví dụ về cách thực hiện, nhưng không thể hiểu được. Vui lòng chỉ các khu vực nơi tôi đang làm sai, và cũng xin vui lòng gửi đúng cách để làm điều đó.
Cảm ơn rất nhiều đã dành thời gian ...
EDIT :::
Tôi đã thay đổi MainActivity.java để mở rộng FragmentActivity thay vì hoạt động và cũng đã thay đổi android: giá trị tên trong activity_main. xml để trỏ đến file Java thay vì mảnh vỡ ...
tôi nhận được ngoại lệ sau :::
04-16 15:29:43.821: E/AndroidRuntime(563): FATAL EXCEPTION: main
04-16 15:29:43.821: E/AndroidRuntime(563): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentexample/com.example.fragmentexample.MainActivity}: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.access$500(ActivityThread.java:122)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.os.Looper.loop(Looper.java:132)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.main(ActivityThread.java:4123)
04-16 15:29:43.821: E/AndroidRuntime(563): at java.lang.reflect.Method.invokeNative(Native Method)
04-16 15:29:43.821: E/AndroidRuntime(563): at java.lang.reflect.Method.invoke(Method.java:491)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-16 15:29:43.821: E/AndroidRuntime(563): at dalvik.system.NativeStart.main(Native Method)
04-16 15:29:43.821: E/AndroidRuntime(563): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class fragment
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.inflate(LayoutInflater.java:391)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.inflate(LayoutInflater.java:347)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:223)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.Activity.setContentView(Activity.java:1786)
04-16 15:29:43.821: E/AndroidRuntime(563): at com.example.fragmentexample.MainActivity.onCreate(MainActivity.java:13)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.Activity.performCreate(Activity.java:4397)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
04-16 15:29:43.821: E/AndroidRuntime(563): ... 11 more
04-16 15:29:43.821: E/AndroidRuntime(563): Caused by: java.lang.ClassCastException: com.example.fragmentexample.Fragment_1 cannot be cast to android.support.v4.app.Fragment
04-16 15:29:43.821: E/AndroidRuntime(563): at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
04-16 15:29:43.821: E/AndroidRuntime(563): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:660)
04-16 15:29:43.821: E/AndroidRuntime(563): ... 21 more
đây là thay đổi XML Fil e của activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/fragment_content_1"
android:name="com.example.fragmentexample.Fragment_1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</fragment>
<fragment
android:id="@+id/fragment_content_2"
android:name="com.example.fragmentexample.Fragment_2"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<!-- Preview: [email protected]/fragment_basic -->
</fragment>
</LinearLayout>
http://www.vogella.com/articles /AndroidFragments/article.html http://developer.android.com/training/basics/fragments/creating.html – Triode
Tham khảo [tại đây] (http://v4all123.blogspot.com/2013/07/simple-fragments-tutorial.html). – Gunaseelan