如何以编程方式在 Java 中添加 Lottie 动画

Question

I tried to add Lottie Animation to Java (Android) programmatically, but I keep failing. I will show my code below I need to change from drawable to Lottie.

This is the code for drawables:

if (status.equals("connect")) {

            vpnBtn.setBackgroundResource(R.drawable.but_connect_light);
            logTv.setTextColor(getResources().getColor(R.color.font_color));

        } else if (status.equals("connecting")) {

            vpnBtn.setBackgroundResource(R.drawable.but_connecting_dark);
            logTv.setTextColor(getResources().getColor(R.color.font_color));

        } else if (status.equals("connected")) {

            vpnBtn.setBackgroundResource(R.drawable.but_disconnect_dark);
            logTv.setTextColor(getResources().getColor(R.color.purple));

        } else if (status.equals("failed")) {

            vpnBtn.setBackgroundResource(R.drawable.but_connect_dark);

        }

This is the xml relating above

<ImageView
        android:id="@+id/vpnBtn"
        android:layout_alignParentBottom="true"
        android:layout_gravity="center_horizontal"
        android:tag="1"
        android:layout_width="140dp"
        android:layout_height="140dp"
        android:background="@drawable/but_connect_light"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="50dp"/>

Answer 1

First Use this dependency :

implementation 'com.airbnb.android:lottie:3.6.1'

Add LottieAnimationView in xml:

 <com.airbnb.lottie.LottieAnimationView       
        android:id="@+id/animation"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        android:layout_gravity="center"
        app:lottie_autoPlay="true"
        app:lottie_fileName="loading.json"
        app:lottie_loop="true"
        app:lottie_speed="1" />

Change animation according to your use:

animation.setAnimation("loading.json");

Note : Add your lottie animation json file in asset folder.

Answer 2

At last i achieved this with the below solution

String vpnsBtn;

if (check.equals("night")){

        switch (status) {
            case "connect":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("disconnected.json");
                logTv.setTextColor(getResources().getColor(R.color.font_color));

                break;
            case "connecting":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("connectingg.json");
                logTv.setTextColor(getResources().getColor(R.color.font_color));

                break;
            case "connected":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("connected.json");
                logTv.setTextColor(getResources().getColor(R.color.purple));

                break;
            case "failed":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("disconnected.json");

                break;
        }

    }else {

        switch (status) {
            case "connect":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("disconnected.json");
                logTv.setTextColor(getResources().getColor(R.color.font_color));

                break;
            case "connecting":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("connectingg.json");
                logTv.setTextColor(getResources().getColor(R.color.font_color));

                break;
            case "connected":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("connected.json");
                logTv.setTextColor(getResources().getColor(R.color.purple));

                break;
            case "failed":

                vpnBtn.setVisibility(View.VISIBLE);
                vpnsBtn = ("disconnected.json");

                break;
        }
    }

    LottieAnimationView animationView = findViewById(R.id.vpnBtn);
    animationView.setImageAssetsFolder("vpnconnect");
    animationView.setAnimation(vpnsBtn);
    animationView.loop(true);
    animationView.playAnimation();

Hope this will help other who want to use dynamic button with Lottie on Android.

Answer 3

For using Lottie I did these:

In build.gradle(:app) add this and sync:

implementation 'com.airbnb.android:lottie:$lottieVersion'

then, add assets file. Then, add the JSON files there. Then, go to activity_main.xml file, add:

<com.airbnb.lottie.LottieAnimationView
            android:id="@+id/lav_actionBar"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:layout_marginStart="0dp"
            android:layout_marginTop="0dp"
            android:layout_marginEnd="0dp"
            android:scaleType="centerCrop"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:lottie_autoPlay="true"
            app:lottie_fileName="circle-load.json" --> add your JSON file name 
            app:lottie_loop="true" />

Answer 4

The above solutions didn't work for me. It crashes the app.

try using this

animationView.setAnimation(R.raw.your_lottie_file)

or, adding it to the answer from Infinite

`String vpnsBtn;

if (check.equals("night")){

    switch (status) {
        case "connect":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.disconnected;
            logTv.setTextColor(getResources().getColor(R.color.font_color));

            break;
        case "connecting":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.connectingg;
            logTv.setTextColor(getResources().getColor(R.color.font_color));

            break;
        case "connected":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.connected
            logTv.setTextColor(getResources().getColor(R.color.purple));

            break;
        case "failed":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.disconnected;

            break;
    }

}else {

    switch (status) {
        case "connect":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.disconnected;
            logTv.setTextColor(getResources().getColor(R.color.font_color));

            break;
        case "connecting":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.connectingg;;
            logTv.setTextColor(getResources().getColor(R.color.font_color));

            break;
        case "connected":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.connected;;
            logTv.setTextColor(getResources().getColor(R.color.purple));

            break;
        case "failed":

            vpnBtn.setVisibility(View.VISIBLE);
            vpnsBtn = R.raw.disconnected;

            break;
    }
}

LottieAnimationView animationView = findViewById(R.id.vpnBtn);
animationView.setImageAssetsFolder("vpnconnect");
animationView.setAnimation(vpnsBtn);
animationView.loop(true);
animationView.playAnimation();`