I'm a beginner on Android programming and I'm having an error that I can not fix.
I'm doing a project that uses fragments. I have a small layout that works perfectly when I do not put the fragment component, but when I put it, the parameter savedInstanceState of onCreate() is null.
XML Main
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".Main"
android:background="#ff25947a">
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3">
<ListView
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:clickable="true" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:layout_weight="7"
android:id="@+id/layout_direito">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.br.estudar.Fragment1"
android:id="@+id/fragment"
android:layout_gravity="center_horizontal"
tools:layout="@layout/layout_fragment_1" />
</LinearLayout>
</LinearLayout>
XML fragment layout
<?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:background="#ff586abe">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/textView"
android:textColor="#ffffff"
android:textSize="30dp" />
</LinearLayout>
JAVA MAIN
package com.br.estudar;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Main extends FragmentActivity {
FragmentManager fm = this.getSupportFragmentManager();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String [] lista = new String[]{"Fragment 1", "Altera Texto", "Fragment 2", "Fragment 3"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, lista);
ListView lv = (ListView)findViewById(R.id.listView);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(position == 1)
{
Fragment1 frag = (Fragment1) fm.findFragmentById(R.id.fragment);
frag.setText("Frag1 - texto alterado");
}
}
});
}
}
JAVA Fragment1
package com.br.estudar;
import android.graphics.Color;
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 Fragment1 extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup conteiner, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.layout_fragment_1, null);
this.setText("Fragment 1");
return view;
}
public void setText(String texto)
{
TextView tv = (TextView) this.getView().findViewById(R.id.textView);
tv.setText(texto);
this.getView().setBackgroundColor(Color.rgb(25, 61, 36));
}
}
MANIFEST
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.br.estudar">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".Main">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
The error that occurs is as follows:
12-30 16:27:08.517 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.517 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.517 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.media.session.MediaController', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.517 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.widget.Toolbar', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.517 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.app.ActivityManager$TaskDescription', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.527 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.527 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.527 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.537 15362-15362/com.br.estudar E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.br.estudar.Main.access$super
12-30 16:27:08.577 15362-15362/com.br.estudar E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.br.estudar, PID: 15362
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.br.estudar/com.br.estudar.Main}: android.view.InflateException: Binary XML file line #34: Error inflating class Fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2318)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #34: Error inflating class Fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:707)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
at android.app.Activity.setContentView(Activity.java:2002)
at com.br.estudar.Main.onCreate(Main.java:18)
at android.app.Activity.performCreate(Activity.java:5411)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.Fragment" on path: DexPathList[[zip file "/data/app/com.br.estudar-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.br.estudar-2, /vendor/lib, /system/lib, /system/lib/arm]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.view.LayoutInflater.createView(LayoutInflater.java:559)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:652)
at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
at android.app.Activity.setContentView(Activity.java:2002)
at com.br.estudar.Main.onCreate(Main.java:18)
at android.app.Activity.performCreate(Activity.java:5411)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)
If you can help me please, Thank you in advance.