How to create Custom Ratings bar in Android

2楼-- · 2018-12-31 08:50

For SVG RatingBar I used RatingBar custom Vector Drawables superimposing and the answer of erdomester here. This solution traverses all drawables inside SvgRatingBar view of your layout, so in RecyclerView it has an overhead.

SvgRatingBar.java:

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ClipDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.VectorDrawable;
import android.graphics.drawable.shapes.RoundRectShape;
import android.graphics.drawable.shapes.Shape;
import android.os.Build;
import android.support.v7.graphics.drawable.DrawableWrapper;
import android.support.v7.widget.AppCompatRatingBar;
import android.util.AttributeSet;
import android.view.Gravity;

public class SvgRatingBar extends AppCompatRatingBar {

    private Bitmap sampleTile;

    public SvgRatingBar(Context context) {
        this(context, null);
    }

    public SvgRatingBar(Context context, AttributeSet attrs) {
        this(context, attrs, android.support.v7.appcompat.R.attr.ratingBarStyle);
    }

    public SvgRatingBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        LayerDrawable drawable = (LayerDrawable) createTile(getProgressDrawable(), false);
        setProgressDrawable(drawable);
    }

    /**
     * Converts a drawable to a tiled version of itself. It will recursively
     * traverse layer and state list drawables.
     */
    @SuppressLint("RestrictedApi")
    private Drawable createTile(Drawable drawable, boolean clip) {
        if (drawable instanceof DrawableWrapper) {
            Drawable inner = ((DrawableWrapper) drawable).getWrappedDrawable();
            if (inner != null) {
                inner = createTile(inner, clip);
                ((DrawableWrapper) drawable).setWrappedDrawable(inner);
            }
        } else if (drawable instanceof LayerDrawable) {
            LayerDrawable background = (LayerDrawable) drawable;
            final int n = background.getNumberOfLayers();
            Drawable[] outDrawables = new Drawable[n];

            for (int i = 0; i < n; i++) {
                int id = background.getId(i);
                outDrawables[i] = createTile(background.getDrawable(i),
                        (id == android.R.id.progress || id == android.R.id.secondaryProgress));
            }
            LayerDrawable newBg = new LayerDrawable(outDrawables);

            for (int i = 0; i < n; i++) {
                newBg.setId(i, background.getId(i));
            }

            return newBg;

        } else if (drawable instanceof BitmapDrawable) {
            final BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
            final Bitmap tileBitmap = bitmapDrawable.getBitmap();
            if (sampleTile == null) {
                sampleTile = tileBitmap;
            }

            final ShapeDrawable shapeDrawable = new ShapeDrawable(getDrawableShape());
            final BitmapShader bitmapShader = new BitmapShader(tileBitmap,
                    Shader.TileMode.REPEAT, Shader.TileMode.CLAMP);
            shapeDrawable.getPaint().setShader(bitmapShader);
            shapeDrawable.getPaint().setColorFilter(bitmapDrawable.getPaint().getColorFilter());
            return (clip) ? new ClipDrawable(shapeDrawable, Gravity.START,
                    ClipDrawable.HORIZONTAL) : shapeDrawable;
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && drawable instanceof VectorDrawable) {
            return createTile(getBitmapDrawableFromVectorDrawable(drawable), clip);
        }
        return drawable;
    }

    private BitmapDrawable getBitmapDrawableFromVectorDrawable(Drawable drawable) {
        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return new BitmapDrawable(getResources(), bitmap);
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (sampleTile != null) {
            final int width = sampleTile.getWidth() * getNumStars();
            setMeasuredDimension(resolveSizeAndState(width, widthMeasureSpec, 0),
                    getMeasuredHeight());
        }
    }

    private Shape getDrawableShape() {
        final float[] roundedCorners = new float[]{5, 5, 5, 5, 5, 5, 5, 5};
        return new RoundRectShape(roundedCorners, null, null);
    }
}

In your layout:

<com.example.common.control.SvgRatingBar
    android:id="@+id/rate"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:minHeight="13dp"
    android:numStars="5"
    android:progressDrawable="@drawable/rating_bar"
    android:rating="3.5"
    android:stepSize="0.01"
    />

You also have to create rating_bar.xml with two SVG drawables:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@android:id/background"
        android:drawable="@drawable/ic_unfilled_star"
        />

    <item
        android:id="@android:id/secondaryProgress"
        android:drawable="@drawable/ic_unfilled_star"
        />

    <item
        android:id="@android:id/progress"
        android:drawable="@drawable/ic_filled_star"
        />

</layer-list>

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临风纵饮

3楼-- · 2018-12-31 08:51

You can try this rating bar with much better animations

SmileyRating

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梦寄多情

4楼-- · 2018-12-31 08:59

Edit

Have a look at custom rating in motorola http://community.developer.motorola.com/t5/Android-App-Development-for/custom-rating-bar-style-using-android-s-ratingBar-small-style/td-p/10462

Updated

styles.xml

This must be located in your values folder

 <?xml version="1.0" encoding="utf-8"?>
  <resources>
    <style name="foodRatingBar" parent="@android:style/Widget.RatingBar">
       <item name="android:progressDrawable">@drawable/food_rating_bar_full</item>
       <item name="android:minHeight">23dip</item>
       <item name="android:maxHeight">25dip</item>
   </style>
  </resources>

food_rating_bar_full.xml

This file must be in Drawable folder.

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/background"
    android:drawable="@drawable/food_ratingbar_full_empty" />
    <item android:id="@+id/secondaryProgress"
    android:drawable="@drawable/food_ratingbar_full_empty" />
    <item android:id="@+id/progress"
    android:drawable="@drawable/food_ratingbar_full_filled" />
</layer-list>

food_ratingbar_full_empty.xml

This file must be inside Drawable folder.

<?xml version="1.0" encoding="utf-8"?>

<!-- This is the rating bar drawable that is used to
 show a filled cookie. -->
<selector
xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="true"
      android:state_window_focused="true"
      android:drawable="@drawable/cookiee" />

<item android:state_focused="true"
      android:state_window_focused="true"
      android:drawable="@drawable/cookiee" />

<item android:state_selected="true"
      android:state_window_focused="true"
      android:drawable="@drawable/cookiee" />

<item android:drawable="@drawable/cookiee" />

</selector>

food_ratingbar_full_filled.xml

This file must be located in Drawable folder.

<?xml version="1.0" encoding="utf-8"?>

 <!-- This is the rating bar drawable that is used to
 show a unfilled cookie. -->
<selector
xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="true"
      android:state_window_focused="true"
      android:drawable="@drawable/cookie" />

<item android:state_focused="true"
      android:state_window_focused="true"
      android:drawable="@drawable/cookie" />

<item android:state_selected="true"
      android:state_window_focused="true"
      android:drawable="@drawable/cookie" />

<item android:drawable="@drawable/cookie" />

</selector>

main.xml file should look like :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <RatingBar android:id="@+id/ratingBar1"
        style="@style/foodRatingBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </RatingBar>
</LinearLayout>

MainActivity.class should look like :

import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.RatingBar.OnRatingBarChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {
/** Called when the activity is first created. */

RatingBar rb;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    rb=(RatingBar)findViewById(R.id.ratingBar1);

    rb.setOnRatingBarChangeListener(new OnRatingBarChangeListener(){

        @Override
        public void onRatingChanged(RatingBar ratingBar, float rating,
                boolean fromUser) {
            // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(),Float.toString(rating),Toast.LENGTH_LONG).show();

        }

    }); 
}
}

I have used two images:

cookie.jpg

cookiee.jpg

This two images are of same size one is used for identifying selected Rating Bar and other for identifying unselected RatingBar

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萌妹纸的霸气范

5楼-- · 2018-12-31 09:00

When creating a custom rating bar that displays a solid gradient line running on a SeekBar-like track, rather than stars, I also encountered a problem related to the vertical centering of the background (track drawable). This is the flawed drawable code I used originally (which generated the problem), as suggested by Android developer and other StackOverflow entries:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@android:id/background"
        android:drawable="@drawable/seekbar_track"/>
    <item android:id="@android:id/secondaryProgress">
        <scale
            android:drawable="@drawable/seekbar_progress2"
            android:scaleWidth="100%" />
    </item>

    <item android:id="@android:id/progress" >
        <clip android:clipOrientation="horizontal" android:gravity="left" >
            <shape>
                <gradient
                    android:startColor="@color/ratingbar_bg_start"
                    android:centerColor="@color/ratingbar_bg_center"
                    android:centerX="0.5"
                    android:endColor="@color/ratingbar_bg_end"
                    android:angle="0"
                    />
            </shape>
        </clip>
    </item>    

 </layer-list>

The problem here is the first item, which relates to the background of the custom RatingBar. Many entries will tell you to set the layout_minHeight feature to some large value to avoid a vertical spatial disconnect between the thumb and its track. This was not the solution for me - when viewed on a tablet, the background was still drawing to its smaller phone-based size - so the track was consistently positioned well above the center of the RatingBar track. The solution is to remove this entry in the RatingBar drawable, so it now looks like this:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@android:id/secondaryProgress">
        <scale
            android:drawable="@drawable/seekbar_progress2"
            android:scaleWidth="100%" />
    </item>

    <item android:id="@android:id/progress" >
        <clip android:clipOrientation="horizontal" android:gravity="left" >
            <shape>
                <gradient
                    android:startColor="@color/ratingbar_bg_start"
                    android:centerColor="@color/ratingbar_bg_center"
                    android:centerX="0.5"
                    android:endColor="@color/ratingbar_bg_end"
                    android:angle="0"
                    />
            </shape>
        </clip>
    </item>    

 </layer-list>

Then, in the style definition of the custom RatingBar, set the layout_background to the the track drawable. Mine looks like this:

<style name="styleRatingBar" parent="@android:style/Widget.RatingBar">
    <item name="android:indeterminateOnly">false</item>
    <item name="android:background">@drawable/seekbar_track</item>
    <item name="android:progressDrawable">@drawable/abratingbar</item>
    <item name="android:thumb">@drawable/abseekbar_thumb</item>
    <item name="android:minHeight">@dimen/base_29dp</item>
    <item name="android:maxHeight">@dimen/base_29dp</item>
    <item name="android:layout_marginLeft">@dimen/base_10dp</item>
    <item name="android:layout_marginRight">@dimen/base_10dp</item>
    <item name="android:layout_marginTop">@dimen/base_10dp</item>
    <item name="android:layout_marginBottom">@dimen/base_10dp</item>
    <item name="android:scaleType">fitXY</item>
</style>

(Previously, the background setting here was undefined.).

This is the entry in my layout, which uses both the style and the drawables:

<RatingBar
    android:id="@+id/ratingbar_vote"
    style="@style/styleRatingBar"
    android:hint="@string/ratingbar_vote"
    android:contentDescription="@string/ratingbar_vote"
    android:numStars="5"
    android:rating="5"
    android:stepSize="1"
    android:layout_width="match_parent"
    android:layout_height="@dimen/base_29dp"
    android:layout_marginLeft="@dimen/base_120dp"
    android:layout_gravity="bottom|right" />

So, to summarize, do not set the background (track) feature in your custom RatingBar drawable, set it in the layout_background feature of your custom RatingBar style. This ensures the track is always vertically centered in a horizontal RatingBar. (Remember, in this custom RatingBar, instead of using stars or other isolated images as the rating, I'm using a gradient line that "grows" or "shrinks" horizontally to display the rating - this rating line uses a SeekBar-like thumb running on a SeekBar-like "track".)

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爱死公子算了

6楼-- · 2018-12-31 09:01

Making the custom rating bar with layer list and selectors is complex, it is better to override the RatingBar class and create a custom RatingBar. createBackgroundDrawableShape() is the function where you should put your empty state png and createProgressDrawableShape() is the function where you should put your filled state png.

Note: This code will not work with svg for now.

public class CustomRatingBar extends RatingBar {

    @Nullable
    private Bitmap mSampleTile;

    public ShapeDrawableRatingBar(final Context context, final AttributeSet attrs) {
        super(context, attrs);
        setProgressDrawable(createProgressDrawable());
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        if (mSampleTile != null) {
            final int width = mSampleTile.getWidth() * getNumStars();
            setMeasuredDimension(resolveSizeAndState(width, widthMeasureSpec, 0), getMeasuredHeight());
        }
    }

    protected LayerDrawable createProgressDrawable() {
        final Drawable backgroundDrawable = createBackgroundDrawableShape();
        LayerDrawable layerDrawable = new LayerDrawable(new Drawable[]{
            backgroundDrawable,
            backgroundDrawable,
            createProgressDrawableShape()
        });

        layerDrawable.setId(0, android.R.id.background);
        layerDrawable.setId(1, android.R.id.secondaryProgress);
        layerDrawable.setId(2, android.R.id.progress);
        return layerDrawable;
    }

    protected Drawable createBackgroundDrawableShape() {
        final Bitmap tileBitmap = drawableToBitmap(getResources().getDrawable(R.drawable.ic_star_empty));
        if (mSampleTile == null) {
            mSampleTile = tileBitmap;
        }
        final ShapeDrawable shapeDrawable = new ShapeDrawable(getDrawableShape());
        final BitmapShader bitmapShader = new BitmapShader(tileBitmap, Shader.TileMode.REPEAT, Shader.TileMode.CLAMP);
        shapeDrawable.getPaint().setShader(bitmapShader);
        return shapeDrawable;
    }

    protected Drawable createProgressDrawableShape() {
        final Bitmap tileBitmap = drawableToBitmap(getResources().getDrawable(R.drawable.ic_star_full));
        final ShapeDrawable shapeDrawable = new ShapeDrawable(getDrawableShape());
        final BitmapShader bitmapShader = new BitmapShader(tileBitmap, Shader.TileMode.REPEAT, Shader.TileMode.CLAMP);
        shapeDrawable.getPaint().setShader(bitmapShader);
        return new ClipDrawable(shapeDrawable, Gravity.LEFT, ClipDrawable.HORIZONTAL);
    }

    Shape getDrawableShape() {
        final float[] roundedCorners = new float[]{5, 5, 5, 5, 5, 5, 5, 5};
        return new RoundRectShape(roundedCorners, null, null);
    }

    public static Bitmap drawableToBitmap(Drawable drawable) {
        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
        }

        int width = drawable.getIntrinsicWidth();
        width = width > 0 ? width : 1;
        int height = drawable.getIntrinsicHeight();
        height = height > 0 ? height : 1;

        final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        final Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        return bitmap;
    }
}

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余生无你

7楼-- · 2018-12-31 09:06

The following code works:

@Override
protected synchronized void onDraw(Canvas canvas)
{
    int stars = getNumStars();
    float rating = getRating();
    try
    {
        bitmapWidth = getWidth() / stars;
    }
    catch (Exception e)
    {
        bitmapWidth = getWidth();
    }
    float x = 0;

    for (int i = 0; i < stars; i++)
    {
        Bitmap bitmap;
        Resources res = getResources();
        Paint paint = new Paint();

        if ((int) rating > i)
        {
            bitmap = BitmapFactory.decodeResource(res, starColor);
        }
        else
        {
            bitmap = BitmapFactory.decodeResource(res, starDefault);
        }
        Bitmap scaled = Bitmap.createScaledBitmap(bitmap, getHeight(), getHeight(), true);
        canvas.drawBitmap(scaled, x, 0, paint);
        canvas.save();
        x += bitmapWidth;
    }

    super.onDraw(canvas);
}

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How to create Custom Ratings bar in Android

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