android-如何将动画添加到线性布局？

我正在使用线性布局从.net服务器获取带有图像的消息.

当出现新消息时,将增加布局的位置,并将新消息一一添加到布局的顶部.

问题是新消息何时出现,新消息突然添加到布局中.

我想将动画应用于布局,并使我的应用程序像收到新消息时一样,将消息缓慢添加到布局中.意味着先前的消息缓慢向下移动,新消息被添加到布局顶部.

解决方法:

在LinearLayout上使用android：animateLayoutChanges来保存数据.添加新内容时,这将触发动画.首先,将旧数据向下移动,为更多内容腾出空间.然后进行第二步,新数据将淡入空闲空间.

范例程式码

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/baseLL"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
>

    <!-- button used to add data -->
    <Button
        android:layout_width="192dip"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Add Content"
        android:onClick="onAddContentClick" />

    <!-- button used to remove data -->
    <Button
        android:layout_width="192dip"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Remove Content"
        android:onClick="onRemoveContentClick" />

    <!-- data will be added to this LinearLayout at run time -->
    <LinearLayout
        android:id="@+id/dataLL"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:animateLayoutChanges="true"
    >

    </LinearLayout>

</LinearLayout>

basicanimation.java

package com.test.animation.basic;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class BasicAnimationActivity extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public void onAddContentClick(View v) {
        LinearLayout dataLL = (LinearLayout) findViewById(R.id.dataLL);
        int dataCount = dataLL.getChildCount();
        TextView newDataTV = generateData(dataCount);
        dataLL.addView(newDataTV, 0);
    }

    public void onRemoveContentClick(View v) {
        LinearLayout dataLL = (LinearLayout) findViewById(R.id.dataLL);
        if (dataLL.getChildCount() > 0) {
            dataLL.removeViewAt(0);
        }
    }

    private TextView generateData(int dataCount) {
        TextView TV = new TextView(this);
        TV.setText("Data " + dataCount);
        TV.setLayoutParams(new LayoutParams(android.view.ViewGroup.LayoutParams.FILL_PARENT,
                android.view.ViewGroup.LayoutParams.WRAP_CONTENT));
        return TV;
    }
}

标签：android-linearlayout,android
来源： https://codeday.me/bug/20191102/1992707.html