【移動(dòng)應(yīng)用開(kāi)發(fā)技術(shù)】Android中如何創(chuàng)建類(lèi)似Instagram的漸變背景效果

【移動(dòng)應(yīng)用開(kāi)發(fā)技術(shù)】Android中如何創(chuàng)建類(lèi)似Instagram的漸變背景效果

/upload/information/20200623/125/125066.gif1.在drawable文件夾創(chuàng)建一些漸變顏色的資源<?xml

version="1.0"

encoding="utf-8"?>

<shape

xmlns:android="/apk/res/android">

<gradient

android:startColor="#614385"

android:endColor="#516395"

android:angle="0"/>

</shape><?xml

version="1.0"

encoding="utf-8"?>

<shape

xmlns:android="/apk/res/android">

<gradient

android:startColor="#5f2c82"

android:endColor="#49a09d"

android:angle="45"/>

</shape><?xml

version="1.0"

encoding="utf-8"?>

<shape

xmlns:android="/apk/res/android">

<gradient

android:startColor="#4776E6"

android:endColor="#8E54E9"

android:angle="90"/>

</shape><?xml

version="1.0"

encoding="utf-8"?>

<shape

xmlns:android="/apk/res/android">

<gradient

android:startColor="#7141e2"

android:endColor="#d46cb3"

android:angle="135"/>

</shape><?xml

version="1.0"

encoding="utf-8"?>

<animation-list

xmlns:android="/apk/res/android">

<item

android:drawable="@drawable/color1"

android:duration="10000"

/>

<item

android:drawable="@drawable/color2"

android:duration="10000"

/>

<item

android:drawable="@drawable/color3"

android:duration="10000"

/>

<item

android:drawable="@drawable/color4"

android:duration="10000"

/>

</animation-list><?xml

version="1.0"

encoding="utf-8"?>

<LinearLayout

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:background="@drawable/animation_list"

android:id="@+id/container">

<!--

Child

Views

-->

</LinearLayout>LinearLayout

container

=

(LinearLayout)

findViewById(R.id.container);

AnimationDrawable

anim

=

(AnimationDrawable)

container.getBackground();

anim.setEnterFadeDuration(6000);

anim.setExitFadeDuration(2000);

//

開(kāi)始播放動(dòng)畫(huà)：在onResume方法中開(kāi)始播放漸變動(dòng)畫(huà)

@Override

protected

void

onResume()

{

super.onResume();

if

(anim

!=

null

&&

!anim.isRunning())

anim.start();

}

//

停止播放動(dòng)畫(huà)：在onPause方法中停止播放漸變動(dòng)畫(huà)

@Override

protected

void

onPause()

{

super.onPause();

if

(anim

!=

null

&&

anim.isRunning())

anim.stop();

}<resources>

<style

name="Theme.AppTheme.TranslucentStatusBar"

parent="Theme.AppCompat.Light.NoActionBar"

/>

</resources><resources>

<style

name="Theme.AppTheme.TranslucentStatusBar"

parent="Theme.AppCompat.Light.NoActionBar">

<item

name="android:windowTranslucentStatus">true</item>

</style>

</resources><resources>

<style

name="Theme.AppTheme.TranslucentStatusBar"

parent="Theme.AppCompat.Light.NoActionBar">

<item

name="android:statusBarColor">@android:color/transparent</item>

</style>

</resources><resources>

<style

name="Theme.AppTheme.TranslucentStatusBar"

parent="Theme.AppCompat.Light.NoActionBar">

<item

name="android:statusBarColor">@android:color/transparent</item>

<item

name="android:windowLightStatusBar">true</item>

</style>

</resources>public

class

MainActivity

extends

AppCompatActivity

{

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

//

加入下面的代碼

if

(Build.VERSION.SDK_INT

>=

Build.VERSION_CODES.LOLLIPOP)

{

findViewById(android.R.id.content).setSystemUiVisibility(

View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

|

View.SYSTEM_UI_FLAG_LAYOUT_STAB