![](/img/trans.png)
[英]In my simulation of the prototype of my android app the scroll view (linear layout) is not scrolling
[英]My app keeps stopping if i add a scroll view to my linear layout
嗨,我的应用程序在我向线性布局添加滚动视图时不断崩溃。 我需要根据我的列表制作一个动态按钮并调用 JASON web 服务。 在我添加滚动视图之前,这一切都完美无缺。 如何启用滚动到我的应用程序或添加滚动视图。 这个应用程序会崩溃。 编辑代码:我尝试了另一种方法,这也使我的应用程序崩溃
LinearLayout layout = (LinearLayout)findViewById(R.id.linearlayout);
tcodes = new String[] {"T32","T31","T30","T39","T40","T01","T02","T03","T04","T05","T05","T07","Q01"};
for (int i = 0; i < tcodes.length; i++) {
LinearLayout row = (LinearLayout)findViewById(R.id.linearlayout);
row.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
for(int j = 0; j<2;j++) {
Button btnTag = new Button(this);
btnTag.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
btnTag.setText(tcodes[i]);
Drawable top = getResources().getDrawable(R.drawable.aikitting);
btnTag.setCompoundDrawablesWithIntrinsicBounds(null,top,null,null);
btnTag.setId(i);
btnTag.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Button b = (Button)view;
String buttonText = b.getText().toString();
new UserNameToId().execute("http://172.16.206.195/aSSET_manager/ASSET_TABLE/hello_ikhsan?name=ikhsan&job=programmer");
}
});
row.addView(btnTag);
}
layout.addView(row);
}
setContentView(layout);
这是我的 xml 除了约束视图外,我在 XML 中没有添加太多内容
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollView"
android:textAlignment="center"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:id="@+id/linearlayout"
android:layout_height="wrap_content"
android:orientation="vertical" />
</ScrollView>
这是我的日志猫
2021-12-14 08:01:12.889 7169-7169/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 7169
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.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:3635)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3792)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2210)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
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:5247)
at android.view.ViewGroup.addView(ViewGroup.java:5076)
at android.view.ViewGroup.addView(ViewGroup.java:5016)
at android.view.ViewGroup.addView(ViewGroup.java:4988)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:697)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:201)
at com.example.myapplication.MainActivity.onCreate(MainActivity.java:92)
at android.app.Activity.performCreate(Activity.java:8051)
at android.app.Activity.performCreate(Activity.java:8031)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
如果没有 setContentView,您不能使用 xml 资源,您应该创建一个新的线性布局,如果孩子已经有,您不能添加到另一个父级。
在这里,您的解决方案
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
tcodes = new String[] {"T32","T31","T30","T39","T40","T01","T02","T03","T04","T05","T05","T07","Q01"};
for (int i = 0; i < tcodes.length; i++) {
LinearLayout row = new LinearLayout(this); //here you are making mistake
row.setOrientation(LinearLayout.VERTICAL);
row.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
for(int j = 0; j<2;j++) {
Button btnTag = new Button(this);
btnTag.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
btnTag.setText(tcodes[i]);
Drawable top = getResources().getDrawable(R.drawable.aikitting);
btnTag.setCompoundDrawablesWithIntrinsicBounds(null,top,null,null);
btnTag.setId(i);
btnTag.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Button b = (Button)view;
String buttonText = b.getText().toString();
new UserNameToId().execute("http://172.16.206.195/aSSET_manager/ASSET_TABLE/hello_ikhsan?name=ikhsan&job=programmer");
}
});
row.addView(btnTag);
}
layout.addView(row);
}
setContentView(layout);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.