I create this post, because i am new at this, and i need a little help. I am doing a little exercise about a application you that put your name, and it returns "hello (the name you put)". But after i push the button i get the error "The specified child already has a parent. You must call removeView() on the child's parent first"
MainActivity.java
package com.example.holaamigos;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.*;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
public final static String EXTRA_SALUDO = "com.example.holaamigos.SALUDO";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText txtNombre = (EditText)findViewById(R.id.TxtNombre);
final Button btnHola = (Button)findViewById(R.id.BtnHola);
btnHola.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, ActivitySaludo.class);
String saludo = txtNombre.getText().toString();
intent.putExtra(EXTRA_SALUDO, saludo);
startActivity(intent);
}
});
}
@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;
}
}
ActivitySaludo.java
package com.example.holaamigos;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class ActivitySaludo extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_saludo);
Intent intent = getIntent();
String saludo = intent.getStringExtra(MainActivity.EXTRA_SALUDO);
//TextView txt = new TextView(this);
//txt.setText(20);
//txt.setText(saludo);
TextView txtCambiado = (TextView) findViewById(R.id.TxtSaludo);
txtCambiado.setText(saludo);
setContentView(txtCambiado);
}
}
activity_saludo.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/TxtSaludo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
</LinearLayout>
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/LblNombre"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/nombre" />
<EditText
android:id="@+id/TxtNombre"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="text" />
<Button
android:id="@+id/BtnHola"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hola_apy"
android:onClick="enviarSaludo"/>
</LinearLayout>
LogCat
10-10 16:12:18.470: D/AndroidRuntime(810): Shutting down VM
10-10 16:12:18.470: W/dalvikvm(810): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-10 16:12:18.586: E/AndroidRuntime(810): FATAL EXCEPTION: main
10-10 16:12:18.586: E/AndroidRuntime(810): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.holaamigos/com.example.holaamigos.ActivitySaludo}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.os.Handler.dispatchMessage(Handler.java:99)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.os.Looper.loop(Looper.java:137)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-10 16:12:18.586: E/AndroidRuntime(810): at java.lang.reflect.Method.invokeNative(Native Method)
10-10 16:12:18.586: E/AndroidRuntime(810): at java.lang.reflect.Method.invoke(Method.java:511)
10-10 16:12:18.586: E/AndroidRuntime(810): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-10 16:12:18.586: E/AndroidRuntime(810): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-10 16:12:18.586: E/AndroidRuntime(810): at dalvik.system.NativeStart.main(Native Method)
10-10 16:12:18.586: E/AndroidRuntime(810): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-10 16:12:18.586: E/AndroidRuntime(810): at android.view.ViewGroup.addViewInner(ViewGroup.java:3339)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.view.ViewGroup.addView(ViewGroup.java:3210)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.view.ViewGroup.addView(ViewGroup.java:3186)
10-10 16:12:18.586: E/AndroidRuntime(810): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:289)
10-10 16:12:18.586: E/AndroidRuntime(810): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:279)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.Activity.setContentView(Activity.java:1901)
10-10 16:12:18.586: E/AndroidRuntime(810): at com.example.holaamigos.ActivitySaludo.onCreate(ActivitySaludo.java:25)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.Activity.performCreate(Activity.java:5104)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
10-10 16:12:18.586: E/AndroidRuntime(810): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
10-10 16:12:18.586: E/AndroidRuntime(810): ... 11 more
10-10 16:12:18.856: D/dalvikvm(810): GC_CONCURRENT freed 134K, 10% free 2630K/2908K, paused 73ms+83ms, total 237ms
This question is related to
android
xml
android-layout
android-intent
in ActivitySaludo, this line,
setContentView(txtCambiado);
you must set the content view for the activity only once.
You dont need this line: setContentView(txtCambiado);
I encountered this error whenever I omitted a parameter while inflating the view for a fragment in the onCreateView() method like so:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_reject, container);
return view;
}
The solution is to change the view inflation line to:
View view=inflater.inflate(R.layout.fragment_reject, container,false);
The explanation can be found at the Android guide for fragments
Quoting from the guide, the final parameter in the view initialization statement is false because:
"the system is already inserting the inflated layout into the container—passing true would create a redundant view group in the final layout"
I’ve found a solution. I had to clear fragment’s parent from views before destroying and I’ve used the next peace of code for this:
in Java
public void onDestroyView() {
if (rootView != null){
ViewGroup viewGroup = (ViewGroup)rootView.getParent();
if (viewGroup != null){
viewGroup.removeAllViews();
}
}
super.onDestroyView();
}
in Kotlin
override fun onDestroyView() {
if (rootView != null) {
val viewGroup = rootView.parent as ViewGroup?
viewGroup?.removeAllViews();
}
super.onDestroyView()
}
I encountered this error while there is an invisible view in an activity xml layout. At that time it was not used in my case so I have removed it and the crash is not seen anymore.
In my case I was accidentally returning a child view from within Layout.onCreateView() as shown below:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_reject, container, false);
Button button = view.findViewById(R.id.some_button);
return button; // <-- Problem is this
}
The solution was to return the parent view instead of the child view.
frameLayout.addView(yourView); <----- if you are getting error on this line remove view from it's parent first
if (yourView.getParent() != null)
((ViewGroup) yourView.getParent()).removeView(yourView); frameLayout.addView(yourView); (Add view to layout)
You just need to initialize your view in onCreate() method and then in onCreateDialog() again before setView() and it should be work!
In my case i just pass the wrong view to the Method
In onCreate with activity or onCreateView with fragment
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null) {
parent.removeView(view);
}
}
try {
view = inflater.inflate(R.layout.fragment_main, container, false);
} catch (InflateException e) {
e.printStackTrace();
}
if you are adding the same view repeatedly in a for loop .. if this is the case then try creating the View object of the layout inside the for loop . and add the view in side the for loop
To avoid such issues
In my case the problem was I was trying to add same view multiple times to linear layout
View childView = LayoutInflater.from(context).inflate(R.layout.lay_progressheader, parentLayout,false);
for (int i = 1; i <= totalCount; i++) {
parentLayout.addView(childView);
}
just initialize view every time to fix the issue
for (int i = 1; i <= totalCount; i++) {
View childView = LayoutInflater.from(context).inflate(R.layout.lay_progressheader, parentLayout,false);
parentLayout.addView(childView);
}
Try this way,hope this will help you to solve your problem.
TextView textView = new TextView(this);
textView.setText("CustomTextView");
addContentView(textView,new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
Source: Stackoverflow.com