動態地將多個TextView添加到LinearLayout

Question

我在動態添加TextViews時遇到問題。 我想首先通過方法getRoomList()從列表中添加租用的房間，然后再添加帶有文本“：Free”的房間，這些房間位於existingRoomNames getRoomList()數組中但未被租用。

public void checkRoomsAndDate() {
    linearLayout = (LinearLayout) findViewById(R.id.linear1);
    linearLayout.removeAllViews();
    for (Room room : mCalendarModel.mList.getRoomList()) {
        addHiredRoomToLayout(room);
    }
    addNotHiredRoomsToLayout();
}

public void addHiredRoomToLayout(Room room) {
    textView = new TextView(this);
    textView.setText(room.getParameters());
    linearLayout.addView(textView);
}

public void addNotHiredRoomsToLayout() {
    textView2 = new TextView(this);
    for (String name : Constants.existingRoomNames) {
        boolean contains = false;
        for (Room room : mCalendarModel.mList.getRoomList()) {
            if (room.getName().equals(name)) {
                contains = true;
            }
        }
        if (!contains) {
            textView2.setText(name + ": Free");
            linearLayout.addView(textView2);
        }
    }
}

這是XML：

<LinearLayout
    android:orientation="vertical"
    android:layout_width="313dp"
    android:layout_height="150dp"
    android:id="@+id/linear1"
    android:layout_gravity="center"></LinearLayout>

在父級LinearLayout內部。

我得到這樣的異常：

`java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.`

在最后一行：

linearLayout.addView(textView2);

那里有什么問題？

Answer 1

您將再次向布局添加相同的視圖。 將功能更改為

public void addNotHiredRoomsToLayout() {

for (String name : Constants.existingRoomNames) {
    textView2 = new TextView(this);
    boolean contains = false;
    for (Room room : mCalendarModel.mList.getRoomList()) {
        if (room.getName().equals(name)) {
            contains = true;
        }
    }
    if (!contains) {
        textView2.setText(name + ": Free");
        linearLayout.addView(textView2);
    }
}
}

Answer 2

移動

linearLayout = (LinearLayout) findViewById(R.id.linear1);
linearLayout.removeAllViews(); 

內

public void addHiredRoomToLayout(Room room) {
    textView = new TextView(this);
    textView.setText(room.getParameters());
    linearLayout.addView(textView);
}

Answer 3

問題是您每次都使用相同的TextView。 如果要使用多個TextView，則將循環更改為

for (String name : Constants.existingRoomNames) {
    textView2 = new TextView(this); //create a new TextView that wasn't added to layout yet

    boolean contains = false;
    for (Room room : mCalendarModel.mList.getRoomList()) {
        if (room.getName().equals(name)) {
            contains = true;
        }
    }
    if (!contains) {
        textView2.setText(name + ": Free");
        linearLayout.addView(textView2);
    }
}

Answer 4

請嘗試->創建一個名為“ text_view”的xml布局文件：

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"/>

然后行來解決這個問題：

textView2 = (TextView) getLayoutInflater().inflate(R.layout.text_view, null);