addView() 的 IllegalStateException

Question

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.utente.test_dimensions.MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/main"
        android:orientation="vertical">
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <EditText
                android:layout_width="160dp"
                android:layout_height="wrap_content"
                android:digits="123456789"
                android:hint="ID promemoria"/>
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="rimuovi prom." />
        </LinearLayout>
    </LinearLayout>
</RelativeLayout>

Java:

package com.example.utente.test_dimensions;

import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    LinearLayout main = (LinearLayout)findViewById(R.id.main);
    LinearLayout ll_eti = new LinearLayout(this);
    ll_eti.setOrientation(LinearLayout.VERTICAL);
    ll_eti.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    main.addView(ll_eti);

    TextView eti_txtv = new TextView(this);
    eti_txtv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    eti_txtv.setText("Etichetta:");
    ll_eti.addView(eti_txtv);

    TextView val_eti_txtv = new TextView(this);
    val_eti_txtv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    HorizontalScrollView eti_hsv = new HorizontalScrollView(this);
    eti_hsv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    eti_hsv.addView(val_eti_txtv);
    ll_eti.addView(eti_hsv);

    LinearLayout ll_info = new LinearLayout(this);
    ll_info.setOrientation(LinearLayout.VERTICAL);
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params.setMargins(0, 3, 0, 0);
    ll_info.setLayoutParams(params);
    main.addView(ll_info);

    LinearLayout ll_date = new LinearLayout(this);
    ll_date.setOrientation(LinearLayout.HORIZONTAL);
    ll_date.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    ll_info.addView(ll_date);

    TextView date = new TextView(this);
    date.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    date.setText("01/01/2000");
    ll_date.addView(date);

    TextView perm_not_y_or_n = new TextView(this);
    LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params1.setMargins(10, 0, 0, 0);
    perm_not_y_or_n.setText("without permanent notificationW");
    ll_date.addView(perm_not_y_or_n);

    LinearLayout ll_details = new LinearLayout(this);
    LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params2.setMargins(0, 3, 0, 0);
    ll_details.setOrientation(LinearLayout.HORIZONTAL);
    ll_details.setLayoutParams(params2);
    ll_info.addView(ll_details);

    TextView perm_val = new TextView(this);
    perm_val.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    perm_val.setText("Repetitive notification:");
    ll_details.addView(ll_info);

    TextView var_val = new TextView(this);
    LinearLayout.LayoutParams params3 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params3.setMargins(5, 0 , 0 , 0);
    var_val.setLayoutParams(params3);
    var_val.setText("every 100 minutes");
    ll_details.addView(var_val);

    LinearLayout ll_id = new LinearLayout(this);
    ll_id.setOrientation(LinearLayout.VERTICAL);
    ll_id.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    main.addView(ll_id);

    TextView ID_txtv = new TextView(this);
    LinearLayout.LayoutParams params4 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params4.setMargins(0, 5, 0, 0);
    ID_txtv.setLayoutParams(params4);
    ID_txtv.setText("ID:");
    ll_id.addView(ID_txtv);

    HorizontalScrollView horizontalScrollView = new HorizontalScrollView(this);
    horizontalScrollView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    ll_id.addView(horizontalScrollView);

    TextView id_txtv = new TextView(this);
    id_txtv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    id_txtv.setText("p");
    horizontalScrollView.addView(id_txtv);


}

}

这是 logcat：

07-10 14:50:13.023 27776-27776/com.example.utente.test_dimensions E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                Process: com.example.utente.test_dimensions, PID: 27776
                                                                                java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.utente.test_dimensions/com.example.utente.test_dimensions.MainActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
                                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2352)
                                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2414)
                                                                                    at android.app.ActivityThread.access0(ActivityThread.java:151)
                                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1318)
                                                                                    at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                    at android.os.Looper.loop(Looper.java:135)
                                                                                    at android.app.ActivityThread.main(ActivityThread.java:5282)
                                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                                    at java.lang.reflect.Method.invoke(Method.java:375)
                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
                                                                                 Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
                                                                                    at android.view.ViewGroup.addViewInner(ViewGroup.java:3937)
                                                                                    at android.view.ViewGroup.addView(ViewGroup.java:3787)
                                                                                    at android.view.ViewGroup.addView(ViewGroup.java:3728)
                                                                                    at android.view.ViewGroup.addView(ViewGroup.java:3701)
                                                                                    at com.example.utente.test_dimensions.MainActivity.onCreate(MainActivity.java:67)
                                                                                    at android.app.Activity.performCreate(Activity.java:6865)
                                                                                    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
                                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
                                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2414) 
                                                                                    at android.app.ActivityThread.access0(ActivityThread.java:151) 
                                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1318) 
                                                                                    at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                    at android.os.Looper.loop(Looper.java:135) 
                                                                                    at android.app.ActivityThread.main(ActivityThread.java:5282) 
                                                                                    at java.lang.reflect.Method.invoke(Native Method) 
                                                                                    at java.lang.reflect.Method.invoke(Method.java:375) 
                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) 
                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

我正在测试向 xml 文件添加视图（对于我的应用程序）；我不明白为什么这不起作用，你有什么建议吗？我看到每个人都使用 addView() 向布局添加视图，但为什么这对我不起作用？

Answer 1

您不能将相同的视图添加到两个不同的父级或将一个视图添加到父级两次。

您似乎正在尝试将 ll_info 视图添加到 main 视图和 ll_details 视图。

Answer 2

您的问题是您正在尝试将一个视图添加到另一个视图，但该视图已被添加到另一个视图。

第 67 行你正在做：

ll_details.addView(ll_info);

正在尝试将 ll_info 添加到 ll_details。但是在第 39 行，您已经将 ll_info 添加到您的主视图：

main.addView(ll_info);

您不能将相同的视图对象添加到两个不同的父级。

addView() 的 IllegalStateException

IllegalStateException for addView()

java

xml

android

view

illegalstateexception