Java 当用户向下滚动或添加新视图时,FloatingActionButton向下滚动

Java 当用户向下滚动或添加新视图时,FloatingActionButton向下滚动,java,android,xml,Java,Android,Xml,我目前正在开发一个大学应用程序,其中1个UI线程负责添加学期按钮。当应用程序旋转并单击FloatingAction按钮以添加视图时,在视图进入屏幕下方后,每次单击时按钮都会向下滚动。我试图调整我的XML,但不幸的是什么也没发生。我的问题是,当用户上下滚动时,如何使我的晶圆厂保持在屏幕上的相同位置 这是我的UI线程: public class MainActivity extends AppCompatActivity { int counter = 0; FloatingAc

我目前正在开发一个大学应用程序,其中1个UI线程负责添加学期按钮。当应用程序旋转并单击FloatingAction按钮以添加视图时,在视图进入屏幕下方后,每次单击时按钮都会向下滚动。我试图调整我的XML,但不幸的是什么也没发生。我的问题是,当用户上下滚动时,如何使我的晶圆厂保持在屏幕上的相同位置

这是我的UI线程:

public class MainActivity extends AppCompatActivity {

    int counter = 0;

    FloatingActionButton addingSemester;
    Button semesterButton;
    LinearLayout semesterLayout;
    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
            AppBarLayout.LayoutParams.MATCH_PARENT,
            AppBarLayout.LayoutParams.WRAP_CONTENT);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        addingSemester = (FloatingActionButton) findViewById(R.id.addActionButton);
        semesterLayout = (LinearLayout) findViewById(R.id.main_layout);
        semesterButton = new Button(MainActivity.this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.delete) {
            new AlertDialog.Builder(MainActivity.this)
            .setTitle("Delete entry")
                    .setMessage("Are you sure you want to delete everything?")
                    .setCancelable(true)
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            semesterLayout.removeAllViews();
                            counter = 0;
                        }
                    })
                    .setNegativeButton("No", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.cancel();
                        }
                    })
                    .show();
            return true;
        }

        return super.onOptionsItemSelected(item);

    }

    public void onFloatActionButtonClick(View view) {
        semesterButton = new Button(MainActivity.this);
        if (counter < 8) {
            semesterButton.setId(counter + 1);
            semesterButton.setText("Semester " + (counter + 1));
            semesterButton.setBackgroundColor(getColor(R.color.colorPrimary));
            semesterButton.setTextColor(Color.WHITE);
            lp.setMargins(24, 24, 24, 24);
            semesterButton.setLayoutParams(lp);
            semesterLayout.addView(semesterButton);
            counter++;
            semesterButton.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    final Button b = (Button) v;
                    b.setTag(b.getText().toString());
                    b.setBackgroundColor(Color.RED);
                    b.setText("Delete");

                    new AlertDialog.Builder(MainActivity.this)
                            .setTitle("Delete entry")
                            .setMessage("Are you sure you want to delete this entry?")
                            .setCancelable(true)
                            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int which) {
                                    semesterLayout.removeView(b);
                                    counter--;
                                    for (int i = 0; i < semesterLayout.getChildCount(); i++) {
                                        ((Button) semesterLayout.getChildAt(i)).setText("Semester " + (i + 1));
                                    }
                                }
                            })
                            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int which) {
                                    b.cancelLongPress();
                                    b.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.colorPrimary));
                                    b.setText(b.getTag().toString());
                                    dialog.cancel();

                                }
                            })
                            .show();
                    return true;
                }
            });

        } else if (counter == 8) {
            Toast.makeText(MainActivity.this, "You cannot add more than 8 semesters", Toast.LENGTH_SHORT).show();
        }
    }
}
public类MainActivity扩展了AppCompatActivity{
int计数器=0;
浮动操作按钮添加学期;
按钮-按钮;
线性布局;
RelativeLayout.LayoutParams lp=新的RelativeLayout.LayoutParams(
AppBarLayout.LayoutParams.MATCH_父级,
AppBarLayout.LayoutParams.WRAP_内容);
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AddingSerm=(FloatingActionButton)findViewById(R.id.addActionButton);
semesterLayout=(LinearLayout)findviewbyd(R.id.main\u布局);
semesterButton=新按钮(MainActivity.this);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
MenuInflater MenuInflater=getMenuInflater();
菜单充气器(右菜单主菜单);
返回super.onCreateOptions菜单(菜单);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
int id=item.getItemId();
if(id==R.id.delete){
新建AlertDialog.Builder(MainActivity.this)
.setTitle(“删除条目”)
.setMessage(“确实要删除所有内容吗?”)
.setCancelable(真)
.setPositiveButton(“是”,新的DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
semesterLayout.removeAllViews();
计数器=0;
}
})
.setNegativeButton(“否”,新的DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
dialog.cancel();
}
})
.show();
返回true;
}
返回super.onOptionsItemSelected(项目);
}
public void on floatAction按钮单击(查看){
semesterButton=新按钮(MainActivity.this);
如果(计数器<8){
设置ID(计数器+1);
setText(“学期”+(计数器+1));
setBackgroundColor(getColor(R.color.colorPrimary));
semesterButton.setTextColor(Color.WHITE);
lp.设定利润(24,24,24,24);
SeMeterButton.setLayoutParams(lp);
semesterLayout.addView(semesterButton);
计数器++;
semesterButton.setOnLongClickListener(新视图。OnLongClickListener(){
@凌驾
仅长按公共布尔值(视图v){
最终按钮b=(按钮)v;
b、 setTag(b.getText().toString());
b、 setBackgroundColor(颜色:红色);
b、 setText(“删除”);
新建AlertDialog.Builder(MainActivity.this)
.setTitle(“删除条目”)
.setMessage(“确实要删除此条目吗?”)
.setCancelable(真)
.setPositiveButton(“是”,新的DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
semesterLayout.removeView(b);
计数器--;
对于(int i=0;i
这是我的XML

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
    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="wrap_content"
    android:background="#FFFFFF"
    tools:context="myapp.onur.journeygpacalculator.MainActivity">

    <ScrollView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        >
        <LinearLayout
            android:id="@+id/main_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="6dp">
        </LinearLayout>
    </ScrollView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/addActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_margin="16dp"
        android:clickable="true"
        android:longClickable="true"
        android:onClick="onFloatActionButtonClick"
        android:src="@drawable/ic_add_black_48dp"
        android:tint="@color/colorWhite"
        app:backgroundTint="@color/colorPrimary"
        app:layout_behavior="com.myapp.onur.journeygpacalculator.ScrollingFABBehavior"
        android:elevation="6dp"
        app:borderWidth="0dp"/>
</RelativeLayout>


这里有问题吗?对不起。我刚刚编辑了它。