How to create a looping animation by continuous tr

问题:

By using a repeating image like this,

is it possible to create animation like this?

回答1:

I figured it out


MainActivity.java:

public class MainActivity extends Activity {

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

        final int screenWidth = getScreenDimensions(this).x;
        final int waveImgWidth = getResources().getDrawable(R.drawable.wave).getIntrinsicWidth();
        int animatedViewWidth = 0;
        while (animatedViewWidth < screenWidth) {
            animatedViewWidth += waveImgWidth;
        }
        animatedViewWidth += waveImgWidth;


        View animatedView = findViewById(R.id.animated_view);
        FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) animatedView.getLayoutParams();
        layoutParams.width = animatedViewWidth;
        animatedView.setLayoutParams(layoutParams);


        Animation waveAnimation = new TranslateAnimation(0, -waveImgWidth, 0, 0);
        waveAnimation.setInterpolator(new LinearInterpolator());
        waveAnimation.setRepeatCount(Animation.INFINITE);
        waveAnimation.setDuration(2500);

        animatedView.startAnimation(waveAnimation);
    }

    public static Point getScreenDimensions(Context context) {
        int width = context.getResources().getDisplayMetrics().widthPixels;
        int height = context.getResources().getDisplayMetrics().heightPixels;
        return new Point(width, height);
    }

}

activity_main.xml:

<FrameLayout 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" >

    <View
        android:id="@+id/animated_view"
        android:layout_width="match_parent"
        android:layout_height="74dp"
        android:background="@drawable/wave_repeating_bg" />

</FrameLayout>

wave_repeating_bg.xml:

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/wave"
    android:tileMode="repeat" />

drawable-xxhdpi/wave.jpg:

回答2:

bottom to top infinite animation i implement this way. it's too easy just use two image and animated one after another.

Inside MainActivity.java

        imageView_background1 = (ImageView) findViewById(R.id.imageView_background1);
        imageView_background1.setVisibility(View.GONE);
        imageView_background1.setVisibility(View.VISIBLE);
        Animation mAnimation = new TranslateAnimation(
                TranslateAnimation.ABSOLUTE, 0f,
                TranslateAnimation.ABSOLUTE, 0f,
                TranslateAnimation.RELATIVE_TO_PARENT, 0f,
                TranslateAnimation.RELATIVE_TO_PARENT, -1f);
        mAnimation.setDuration(10000);
        mAnimation.setRepeatCount(-1);
        mAnimation.setRepeatMode(Animation.INFINITE);
        mAnimation.setInterpolator(new LinearInterpolator());
        imageView_background1.setAnimation(mAnimation);

        imageView_background2 = (ImageView) findViewById(R.id.imageView_background2);
        imageView_background2.setVisibility(View.VISIBLE);
        Animation mAnimation1 = new TranslateAnimation(
                TranslateAnimation.ABSOLUTE, 0f,
                TranslateAnimation.ABSOLUTE, 0f,
                TranslateAnimation.RELATIVE_TO_SELF, 1f,
                TranslateAnimation.RELATIVE_TO_SELF, 0f);
        mAnimation1.setDuration(10000);
        mAnimation1.setRepeatCount(-1);
        mAnimation1.setRepeatMode(Animation.INFINITE);
        mAnimation1.setInterpolator(new LinearInterpolator());
        imageView_background2.setAnimation(mAnimation1);

Inside activity_main.xml (use same image both imageview)

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/ic_splash_background">
    <ImageView
        android:id="@+id/imageView_background1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/ic_splash_categories" />
    <ImageView
        android:id="@+id/imageView_background2"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/ic_splash_categories" />
</FrameLayout>