Pravin Sonawane Pravin Sonawane - 4 months ago 9
Android Question

AnimatedVectorDrawable animation doesn't start

I'm trying to create a simple play to pause and reverse animation on click using AnimatedVectorDrawable. Somehow the animation doesn't start.

My code is as below:

MainActivity.java

public class MainActivity extends AppCompatActivity {

private static final String TAG = "MainActivity";

private ImageView playPauseImgVw;
private AnimatedVectorDrawable playToPauseAvDrwble;
private AnimatedVectorDrawable pauseToPlayAvDrwble;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

playPauseImgVw = (ImageView) findViewById(R.id.activity_main_play_pause_btn_imgVw_id);
playToPauseAvDrwble = (AnimatedVectorDrawable) getDrawable(R.drawable.animated_vector_play_to_pause);
pauseToPlayAvDrwble = (AnimatedVectorDrawable) getDrawable(R.drawable.animated_vector_pause_to_play);

playPauseImgVw.setImageDrawable(playToPauseAvDrwble);
playPauseImgVw.setOnClickListener(newOnClickListener());
}

private View.OnClickListener newOnClickListener() {
return new View.OnClickListener() {
@Override
public void onClick(View v) {
morph();
}
};
}

public void morph() {

Log.d(TAG, "start animation");
playToPauseAvDrwble.start();
}
}


transition_pause_to_play.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator android:duration="1000"
android:propertyName="pathData"
android:valueFrom="@string/path_pause_button"
android:valueTo="@string/path_play_button"
android:valueType="pathType"
android:interpolator="@android:interpolator/fast_out_slow_in" />

</set>


transition_play_to_pause.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator android:duration="1000"
android:propertyName="pathData"
android:valueFrom="@string/path_play_button"
android:valueTo="@string/path_pause_button"
android:valueType="pathType"
android:interpolator="@android:interpolator/fast_out_slow_in" />

</set>


animated_vector_pause_to_play.xml

<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/vector_pause_button">
<target
android:animation="@animator/transition_pause_to_play"
android:name="path_pause_button" />
</animated-vector>


animated_vector_play_to_pause.xml

<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/vector_play_button">
<target
android:animation="@animator/transition_play_to_pause"
android:name="path_play_button" />




vector_pause_button.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="128dp"
android:height="128dp"
android:viewportHeight="600"
android:viewportWidth="600">

<path
android:name="path_name_pause_button"
android:fillAlpha="1"
android:fillColor="@color/color_pause_button"
android:pathData="@string/path_pause_button"
android:strokeColor="@color/color_stroke_pause_button" />




vector_play_button.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="128dp"
android:height="128dp"
android:viewportHeight="600"
android:viewportWidth="600">

<path
android:name="path_name_play_button"
android:fillAlpha="1"
android:fillColor="@color/color_play_button"
android:pathData="@string/path_play_button"
android:strokeColor="@color/color_stroke_play_button" />




activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.merryapps.vectoranimationpoc.MainActivity">

<ImageView
android:id="@+id/activity_main_play_pause_btn_imgVw_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:scaleType="fitCenter"
android:layout_centerHorizontal="true"/>




strings.xml

<resources>
<string name="app_name">VectorAnimationPoc</string>
<string name="path_play_button">M300,70 l 0,-70 95,70 0,0 M300,70 l 95,0 -95,70 0,0 z</string>
<string name="path_pause_button">M365,140 l 30,0 0,-140, -30,0 M300,140 l 30,0 0,-140 -30,0 z</string>
</resources>


Am I missing something here?

Answer

From the code you've posted, this seems like it's mostly correct except for a couple of vital typos!

Your AnimatedVectorDrawable <target> tags are looking for targets named "path_play_button" and "path_pause_button" but in your VectorDrawables the paths are actually named "path_name_play_button" and "path_name_pause button".

You didn't post the actual pathData, but assuming the paths are compatible I think that making sure these names match up correctly should fix it.