当数据来自使用json的url时如何在android中使用loading lottie动画

Question

error

Attempt to invoke virtual method 'void com.airbnb.lottie.LottieAnimationView.setAnimation(java.lang.String)' on a null object reference

animationView.setAnimation("loading.json");
        animationView.playAnimation();

Answer 1

You should initialize the variable animationView

ie animationView = findViewById(R.id.animationView)

Answer 2

I do not know which version of Lottie you're using. So implementing it like this:

Use this for native files .json

 animationView.setAnimation ("loading.json")

Use this for Urls.json

 animationView.setAnimationFromUrl ("https://gist.githubusercontent.com/Allanksr/d36c8a66ea24ec7df1ea422782fa7ae0/raw/bf1a65fc57b1db102893c80f0f3356e100e10a51/proxsensor.json")

Take a look: https://github.com/Allanksr/LottieFiles

Answer 3

Use the Lottie Animation using the following steps:

Add the Gradle dependency to your app

dependencies {  
implementation 'com.airbnb.android:lottie:2.7.0'
}

Add the view to Your Layout XML :

<com.airbnb.lottie.LottieAnimationView
       android:layout_width="wrap_conten"
       android:layout_height="wrap_conten"
       app:lottie_fileName="no_connection.json" //this is the JSON animation stored in assets folder
       app:lottie_autoPlay="true"
       app:lottie_loop="true"/>

In your Activity or Fragment init the view:

private LottieAnimationView animationView;
animationView = (LottieAnimationView) findViewById(R.id.animation_view);

if use form url :

 animationView.setAnimationFromUrl ("https://assets10.lottiefiles.com/datafiles/c56b08b89932c090a0948b53fd58427d/data.json")

Play/Cancel the Animation using:

animationView.playAnimation();
animationView.cancelAnimation();