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android动画效果 translate,Android利用translate、scale、alpha、rotate实现动画效果

發布時間：2023/12/31 Android 36 豆豆

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Android利用translate、scale、alpha、rotate實現動畫效果

在Android中可以用animation實現動畫效果，Android中的animation由四種類型組成:

alpha 透明度的變換

scale 漸變尺寸伸縮動畫

translate view切換位置移動的效果

rotate 旋轉效果

這些xml我們需要定義在res/anim文件夾下面，如下圖所示：

image

scale標簽

android:fromXScale="float"

Float. Starting X size offset, where 1.0 is no change.

android:toXScale="float"

Float. Ending X size offset, where 1.0 is no change.

android:fromYScale="float"

Float. Starting Y size offset, where 1.0 is no change.

android:toYScale="float"

Float. Ending Y size offset, where 1.0 is no change.

android:pivotX="float"

Float. The X coordinate to remain fixed when the object is scaled.

android:pivotY="float"

Float. The Y coordinate to remain fixed when the object is scaled.

alpha

android:fromAlpha="float"

Float. Starting opacity offset, where 0.0 is transparent and 1.0 is opaque.

android:toAlpha="float"

Float. Ending opacity offset, where 0.0 is transparent and 1.0 is opaque.

translate

android:fromXDelta="float"

Float or percentage. Starting X offset. Expressed either: in pixels relative to the normal position (such as "5"), in percentage relative to the element width (such as "5%"), or in percentage relative to the parent width (such as "5%p").

android:toXDelta="float"

Float or percentage. Ending X offset. Expressed either: in pixels relative to the normal position (such as "5"), in percentage relative to the element width (such as "5%"), or in percentage relative to the parent width (such as "5%p").

android:fromYDelta="float"

Float or percentage. Starting Y offset. Expressed either: in pixels relative to the normal position (such as "5"), in percentage relative to the element height (such as "5%"), or in percentage relative to the parent height (such as "5%p").

android:toYDelta="float"

Float or percentage. Ending Y offset. Expressed either: in pixels relative to the normal position (such as "5"), in percentage relative to the element height (such as "5%"), or in percentage relative to the parent height (such as "5%p").

rotate

android:fromDegrees="float"

Float. Starting angular position, in degrees

android:toDegrees="float"

Float. Ending angular position, in degrees.

android:pivotX="float

Float or percentage. The X coordinate of the center of rotation. Expressed either: in pixels relative to the object's left edge (such as "5"), in percentage relative to the object's left edge (such as "5%"), or in percentage relative to the parent container's left edge (such as "5%p").

android:pivotY="float"

Float or percentage. The Y coordinate of the center of rotation. Expressed either: in pixels relative to the object's top edge (such as "5"), in percentage relative to the object's top edge (such as "5%"), or in percentage relative to the parent container's top edge (such as "5%p").

Animation類具有的xml屬性

android:detachWallpaper

Special option for window animations: if this window is on top of a wallpaper, don't animate the wallpaper with it.

android:duration

Amount of time (in milliseconds) for the animation to run.

android:fillAfter

When set to true, the animation transformation is applied after the animation is over.

android:fillBefore

When set to true or when fillEnabled is not set to true, the animation transformation is applied before the animation has started.

android:fillEnabled When set to true, the value of fillBefore is taken into account.

android:interpolator

Defines the interpolator used to smooth the animation movement in time.

android:repeatCount

Defines how many times the animation should repeat.

android:repeatMode

Defines the animation behavior when it reaches the end and the repeat count is greater than 0 or infinite.

android:startOffset

Delay in milliseconds before the animation runs, once start time is reached.

android:zAdjustment

Allows for an adjustment of the Z ordering of the content being animated for the duration of the animation.

具體實例

具體實例:

alpha.xml

android:fromAlpha="1.0"

android:toAlpha="0.1"

android:duration="3000"

android:fillBefore="true">

rotate.xml

android:fromDegrees="0"

android:toDegrees="-650"

android:pivotX="50%"

android:pivotY="50%"

android:duration="3000"

android:fillAfter="true">

scale.xml

android:fromXScale="0.0"

android:toXScale="1.4"

android:fromYScale="0.0"

android:toYScale="1.4"

android:pivotX="50%"

android:pivotY="50%"

android:duration="700" />

translate.xml

android:fromXDelta="0"

android:toXDelta="-80"

android:fromYDelta="0"

android:toYDelta="-80"

android:duration="2000"

android:fillBefore="true">

set_anim.xml

android:duration="3000"

android:fillAfter="true">

android:fromAlpha="0.0"

android:toAlpha="1.0" />

android:fromXScale="0.0"

android:fromYScale="0.0"

android:pivotX="50%"

android:pivotY="50%"

android:toXScale="1.4"

android:toYScale="1.4" />

android:fromDegrees="0"

android:pivotX="50%"

android:pivotY="50%"

android:toDegrees="720" />

java代碼:

package com.qf58.learncustomview;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView textView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

textView = (TextView) findViewById(R.id.text_view);

final Animation scaleAnimation = AnimationUtils.loadAnimation(this, R.anim.scale);

final Animation alphaAnimation = AnimationUtils.loadAnimation(this, R.anim.alpha);

final Animation translate = AnimationUtils.loadAnimation(this, R.anim.translate);

final Animation rotate = AnimationUtils.loadAnimation(this, R.anim.rotate);

final Animation set = AnimationUtils.loadAnimation(this,R.anim.set_anim);

findViewById(R.id.alpha).setOnClickListener(new View.OnClickListener() {

@Override