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

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"

>

android:layout_width="192dip"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:text="Add Content"

android:onClick="onAddContentClick" />

android:layout_width="192dip"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:text="Remove Content"

android:onClick="onRemoveContentClick" />

android:id="@+id/dataLL"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:animateLayoutChanges="true"

>

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