State progressbar android

2019-03-08 16:56发布

站内文章 / Android
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问题:

I'm looking for a smooth way to implement a "state" progressbar in Android like shown in the three examples below. As I'm not a fan of reinventing the wheel I'd like to ask if there is some library available I don't know about.

I looked it up and couldn't find any lib so I guess I need to implement it by myself. What would be the easiest solution to do so? Should I extend ProgressBar or should I do it from scratch? Do you have any suggestions or tutorials I could build up on?

回答1:

Update

Please see the this sample project, Also GIF is attached to give overview.

You can customize the following to your requirement. 

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.View;

public class NumberProgressBar extends View {

    private Context mContext;

    /**
     * The max progress, default is 100
     */
    private int mMax = 100;

    /**
     * current progress, can not exceed the max progress.
     */
    private int mProgress = 0;

    /**
     * the progress area bar color
     */
    private int mReachedBarColor;

    /**
     * the bar unreached area color.
     */
    private int mUnreachedBarColor;

    /**
     * the progress text color.
     */
    private int mTextColor;

    /**
     * the progress text size
     */
    private float mTextSize;

    /**
     * the height of the reached area
     */
    private float mReachedBarHeight;

    /**
     * the height of the unreached area
     */
    private float mUnreachedBarHeight;

    /**
     * the suffix of the number.
     */
    private String mSuffix = "%";

    /**
     * the prefix.
     */
    private String mPrefix = "";


    private final int default_text_color = Color.rgb(66, 145, 241);
    private final int default_reached_color = Color.rgb(66,145,241);
    private final int default_unreached_color = Color.rgb(204, 204, 204);
    private final float default_progress_text_offset;
    private final float default_text_size;
    private final float default_reached_bar_height;
    private final float default_unreached_bar_height;

    /**
     * for save and restore instance of progressbar.
     */
    private static final String INSTANCE_STATE = "saved_instance";
    private static final String INSTANCE_TEXT_COLOR = "text_color";
    private static final String INSTANCE_TEXT_SIZE = "text_size";
    private static final String INSTANCE_REACHED_BAR_HEIGHT = "reached_bar_height";
    private static final String INSTANCE_REACHED_BAR_COLOR = "reached_bar_color";
    private static final String INSTANCE_UNREACHED_BAR_HEIGHT = "unreached_bar_height";
    private static final String INSTANCE_UNREACHED_BAR_COLOR = "unreached_bar_color";
    private static final String INSTANCE_MAX = "max";
    private static final String INSTANCE_PROGRESS = "progress";
    private static final String INSTANCE_SUFFIX = "suffix";
    private static final String INSTANCE_PREFIX = "prefix";
    private static final String INSTANCE_TEXT_VISBILITY = "text_visibility";

    private static final int PROGRESS_TEXT_VISIBLE = 0;
    private static final int PROGRESS_TEXT_INVISIBLE = 1;



    /**
     * the width of the text that to be drawn
     */
    private float mDrawTextWidth;

    /**
     * the drawn text start
     */
    private float mDrawTextStart;

    /**
     *the drawn text end
     */
    private float mDrawTextEnd;

    /**
     * the text that to be drawn in onDraw()
     */
    private String mCurrentDrawText;

    /**
     * the Paint of the reached area.
     */
    private Paint mReachedBarPaint;
    /**
     * the Painter of the unreached area.
     */
    private Paint mUnreachedBarPaint;
    /**
     * the Painter of the progress text.
     */
    private Paint mTextPaint;

    /**
     * Unreached Bar area to draw rect.
     */
    private RectF mUnreachedRectF = new RectF(0,0,0,0);
    /**
     * reached bar area rect.
     */
    private RectF mReachedRectF = new RectF(0,0,0,0);

    /**
     * the progress text offset.
     */
    private float mOffset;

    /**
     * determine if need to draw unreached area
     */
    private boolean mDrawUnreachedBar = true;

    private boolean mDrawReachedBar = true;

    private boolean mIfDrawText = true;

    public enum ProgressTextVisibility{
        Visible,Invisible
    };



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

    public NumberProgressBar(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.numberProgressBarStyle);
    }

    public NumberProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        mContext = context;

        default_reached_bar_height = dp2px(1.5f);
        default_unreached_bar_height = dp2px(1.0f);
        default_text_size = sp2px(10);
        default_progress_text_offset = dp2px(3.0f);

        //load styled attributes.
        final TypedArray attributes = context.getTheme().obtainStyledAttributes(attrs, R.styleable.NumberProgressBar,
                defStyleAttr, 0);

        mReachedBarColor = attributes.getColor(R.styleable.NumberProgressBar_progress_reached_color, default_reached_color);
        mUnreachedBarColor = attributes.getColor(R.styleable.NumberProgressBar_progress_unreached_color,default_unreached_color);
        mTextColor = attributes.getColor(R.styleable.NumberProgressBar_progress_text_color,default_text_color);
        mTextSize = attributes.getDimension(R.styleable.NumberProgressBar_progress_text_size, default_text_size);

        mReachedBarHeight = attributes.getDimension(R.styleable.NumberProgressBar_progress_reached_bar_height,default_reached_bar_height);
        mUnreachedBarHeight = attributes.getDimension(R.styleable.NumberProgressBar_progress_unreached_bar_height,default_unreached_bar_height);
        mOffset = attributes.getDimension(R.styleable.NumberProgressBar_progress_text_offset,default_progress_text_offset);

        int textVisible = attributes.getInt(R.styleable.NumberProgressBar_progress_text_visibility,PROGRESS_TEXT_VISIBLE);
        if(textVisible != PROGRESS_TEXT_VISIBLE){
            mIfDrawText = false;
        }

        setProgress(attributes.getInt(R.styleable.NumberProgressBar_progress,0));
        setMax(attributes.getInt(R.styleable.NumberProgressBar_max, 100));
        //
        attributes.recycle();

        initializePainters();

    }

    @Override
    protected int getSuggestedMinimumWidth() {
        return (int)mTextSize;
    }

    @Override
    protected int getSuggestedMinimumHeight() {
        return Math.max((int)mTextSize,Math.max((int)mReachedBarHeight,(int)mUnreachedBarHeight));
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(measure(widthMeasureSpec,true), measure(heightMeasureSpec,false));
    }

    private int measure(int measureSpec,boolean isWidth){
        int result;
        int mode = MeasureSpec.getMode(measureSpec);
        int size = MeasureSpec.getSize(measureSpec);
        int padding = isWidth?getPaddingLeft()+getPaddingRight():getPaddingTop()+getPaddingBottom();
        if(mode == MeasureSpec.EXACTLY){
            result = size;
        }else{
            result = isWidth ? getSuggestedMinimumWidth() : getSuggestedMinimumHeight();
            result += padding;
            if(mode == MeasureSpec.AT_MOST){
                if(isWidth) {
                    result = Math.max(result, size);
                }
                else{
                    result = Math.min(result, size);
                }
            }
        }
        return result;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if(mIfDrawText){
            calculateDrawRectF();
        }else{
            calculateDrawRectFWithoutProgressText();
        }

        if(mDrawReachedBar){
            canvas.drawRect(mReachedRectF,mReachedBarPaint);
        }

        if(mDrawUnreachedBar) {
            canvas.drawRect(mUnreachedRectF, mUnreachedBarPaint);
        }

        if(mIfDrawText)
            canvas.drawText(mCurrentDrawText,mDrawTextStart,mDrawTextEnd,mTextPaint);
    }

    private void initializePainters(){
        mReachedBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mReachedBarPaint.setColor(mReachedBarColor);

        mUnreachedBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mUnreachedBarPaint.setColor(mUnreachedBarColor);

        mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mTextPaint.setColor(mTextColor);
        mTextPaint.setTextSize(mTextSize);
    }


    private void calculateDrawRectFWithoutProgressText(){
        mReachedRectF.left = getPaddingLeft();
        mReachedRectF.top = getHeight()/2.0f - mReachedBarHeight / 2.0f;
        mReachedRectF.right = (getWidth() - getPaddingLeft() - getPaddingRight() )/(getMax()*1.0f) * getProgress() + getPaddingLeft();
        mReachedRectF.bottom = getHeight()/2.0f + mReachedBarHeight / 2.0f;

        mUnreachedRectF.left = mReachedRectF.right;
        mUnreachedRectF.right = getWidth() - getPaddingRight();
        mUnreachedRectF.top = getHeight()/2.0f +  - mUnreachedBarHeight / 2.0f;
        mUnreachedRectF.bottom = getHeight()/2.0f  + mUnreachedBarHeight / 2.0f;
    }

    private void calculateDrawRectF(){

        mCurrentDrawText = String.format("%d" ,getProgress()*100/getMax());
        mCurrentDrawText = mPrefix + mCurrentDrawText + mSuffix;
        mDrawTextWidth = mTextPaint.measureText(mCurrentDrawText);

        if(getProgress() == 0){
            mDrawReachedBar = false;
            mDrawTextStart = getPaddingLeft();
        }else{
            mDrawReachedBar = true;
            mReachedRectF.left = getPaddingLeft();
            mReachedRectF.top = getHeight()/2.0f - mReachedBarHeight / 2.0f;
            mReachedRectF.right = (getWidth() - getPaddingLeft() - getPaddingRight() )/(getMax()*1.0f) * getProgress() - mOffset + getPaddingLeft();
            mReachedRectF.bottom = getHeight()/2.0f + mReachedBarHeight / 2.0f;
            mDrawTextStart = (mReachedRectF.right + mOffset);
        }

        mDrawTextEnd =  (int) ((getHeight() / 2.0f) - ((mTextPaint.descent() + mTextPaint.ascent()) / 2.0f)) ;

        if((mDrawTextStart + mDrawTextWidth )>= getWidth() - getPaddingRight()){
            mDrawTextStart = getWidth() - getPaddingRight() - mDrawTextWidth;
            mReachedRectF.right = mDrawTextStart - mOffset;
        }

        float unreachedBarStart = mDrawTextStart + mDrawTextWidth + mOffset;
        if(unreachedBarStart >= getWidth() - getPaddingRight()){
            mDrawUnreachedBar = false;
        }else{
            mDrawUnreachedBar = true;
            mUnreachedRectF.left = unreachedBarStart;
            mUnreachedRectF.right = getWidth() - getPaddingRight();
            mUnreachedRectF.top = getHeight()/2.0f +  - mUnreachedBarHeight / 2.0f;
            mUnreachedRectF.bottom = getHeight()/2.0f  + mUnreachedBarHeight / 2.0f;
        }
    }
    /**
     * get progress text color
     * @return progress text color
     */
    public int getTextColor() {
        return mTextColor;
    }

    /**
     * get progress text size
     * @return progress text size
     */
    public float getProgressTextSize() {
        return mTextSize;
    }

    public int getUnreachedBarColor() {
        return mUnreachedBarColor;
    }

    public int getReachedBarColor() {
        return mReachedBarColor;
    }

    public int getProgress() {
        return mProgress;
    }

    public int getMax() {
        return mMax;
    }

    public float getReachedBarHeight(){
        return mReachedBarHeight;
    }

    public float getUnreachedBarHeight(){
        return mUnreachedBarHeight;
    }

    public void setProgressTextSize(float TextSize) {
        this.mTextSize = TextSize;
        mTextPaint.setTextSize(mTextSize);
        invalidate();
    }

    public void setProgressTextColor(int TextColor) {
        this.mTextColor = TextColor;
        mTextPaint.setColor(mTextColor);
        invalidate();
    }

    public void setUnreachedBarColor(int BarColor) {
        this.mUnreachedBarColor = BarColor;
        mUnreachedBarPaint.setColor(mReachedBarColor);
        invalidate();
    }

    public void setReachedBarColor(int ProgressColor) {
        this.mReachedBarColor = ProgressColor;
        mReachedBarPaint.setColor(mReachedBarColor);
        invalidate();
    }

    public void setReachedBarHeight(float height){
        mReachedBarHeight = height;
    }

    public void setUnreachedBarHeight(float height){
        mUnreachedBarHeight = height;
    }

    public void setMax(int Max) {
        if(Max > 0){
            this.mMax = Max;
            invalidate();
        }
    }

    public void setSuffix(String suffix){
        if(suffix == null){
            mSuffix = "";
        }else{
            mSuffix = suffix;
        }
    }

    public String getSuffix(){
        return mSuffix;
    }

    public void setPrefix(String prefix){
        if(prefix == null)
            mPrefix = "";
        else{
            mPrefix = prefix;
        }
    }

    public String getPrefix(){
        return mPrefix;
    }

    public void incrementProgressBy(int by){
        if(by > 0){
            setProgress(getProgress() + by);
        }
    }

    public void setProgress(int Progress) {
        if(Progress <= getMax()  && Progress >= 0){
            this.mProgress = Progress;
            invalidate();
        }
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE_STATE,super.onSaveInstanceState());
        bundle.putInt(INSTANCE_TEXT_COLOR,getTextColor());
        bundle.putFloat(INSTANCE_TEXT_SIZE, getProgressTextSize());
        bundle.putFloat(INSTANCE_REACHED_BAR_HEIGHT,getReachedBarHeight());
        bundle.putFloat(INSTANCE_UNREACHED_BAR_HEIGHT,getUnreachedBarHeight());
        bundle.putInt(INSTANCE_REACHED_BAR_COLOR,getReachedBarColor());
        bundle.putInt(INSTANCE_UNREACHED_BAR_COLOR,getUnreachedBarColor());
        bundle.putInt(INSTANCE_MAX,getMax());
        bundle.putInt(INSTANCE_PROGRESS,getProgress());
        bundle.putString(INSTANCE_SUFFIX,getSuffix());
        bundle.putString(INSTANCE_PREFIX,getPrefix());
        bundle.putBoolean(INSTANCE_TEXT_VISBILITY, getProgressTextVisibility());
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if(state instanceof Bundle){
            final Bundle bundle = (Bundle)state;
            mTextColor = bundle.getInt(INSTANCE_TEXT_COLOR);
            mTextSize = bundle.getFloat(INSTANCE_TEXT_SIZE);
            mReachedBarHeight = bundle.getFloat(INSTANCE_REACHED_BAR_HEIGHT);
            mUnreachedBarHeight = bundle.getFloat(INSTANCE_UNREACHED_BAR_HEIGHT);
            mReachedBarColor = bundle.getInt(INSTANCE_REACHED_BAR_COLOR);
            mUnreachedBarColor = bundle.getInt(INSTANCE_UNREACHED_BAR_COLOR);
            initializePainters();
            setMax(bundle.getInt(INSTANCE_MAX));
            setProgress(bundle.getInt(INSTANCE_PROGRESS));
            setPrefix(bundle.getString(INSTANCE_PREFIX));
            setSuffix(bundle.getString(INSTANCE_SUFFIX));
            setProgressTextVisibility(bundle.getBoolean(INSTANCE_TEXT_VISBILITY) ? ProgressTextVisibility.Visible : ProgressTextVisibility.Invisible);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATE));
            return;
        }
        super.onRestoreInstanceState(state);
    }

    public float dp2px(float dp) {
        final float scale = getResources().getDisplayMetrics().density;
        return  dp * scale + 0.5f;
    }

    public float sp2px(float sp){
        final float scale = getResources().getDisplayMetrics().scaledDensity;
        return sp * scale;
    }

    public void setProgressTextVisibility(ProgressTextVisibility visibility){
        mIfDrawText = visibility == ProgressTextVisibility.Visible;
        invalidate();
    }

    public boolean getProgressTextVisibility() {
        return mIfDrawText;
    }

}

Link 1

Link 2

Link 3

Link 4

Link 5

Link 6

You can also do it with linear layout. I have done a simple example, just a simple example.

<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" >

    <LinearLayout
        android:id="@+id/ll_progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:background="@drawable/layout" >

        <ImageView
            android:id="@+id/ImageView01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="14dp"
            android:src="@drawable/bg_1" />

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="38dp"
            android:layout_marginTop="14dp"
            android:src="@drawable/bg_1" />


        <ImageView
            android:id="@+id/imageView12"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="35dp"
            android:layout_marginTop="14dp"
            android:src="@drawable/bg_1" />

    </LinearLayout>

</RelativeLayout>

MainActivity.java

import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

    LinearLayout llProgress;
    Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        llProgress = (LinearLayout) findViewById(R.id.ll_progress);
        handler = new Handler(getMainLooper());

        startTransition();
    }

    int prevChild = 0;

    private void startTransition() {
        // create the transition layers
        Drawable[] layers = new Drawable[2];
        layers[0] = new BitmapDrawable(getResources(), BitmapFactory.decodeResource(getResources(), R.drawable.bg));
        layers[1] = new BitmapDrawable(getResources(), BitmapFactory.decodeResource(getResources(), R.drawable.bg_1));

        final TransitionDrawable[] transitionDrawable = new TransitionDrawable[llProgress.getChildCount()];
        for (int i = 0; i < llProgress.getChildCount(); i++) {
            transitionDrawable[i] = new TransitionDrawable(layers);
            ((ImageView) llProgress.getChildAt(i)).setImageDrawable(transitionDrawable[i]);
        }

        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                transitionDrawable[prevChild++].startTransition(1000);
                if(prevChild > llProgress.getChildCount() - 1){
                    prevChild = 0;
                }
                handler.postDelayed(this, 1000 * 3);
            }
        }, 1000 * 3);

    }



回答2:

The ProgressBar widget delegates the drawing of it's progress to it's assigned progress Drawable by setting the appropriate level on it. The default* progress Drawable is a layer-list** that contains three layers: background, progress, and secondary progress. The last two are wrapped in clip or scale containers that are automatically clipped or scaled to their percentage based on their levels. They are also assigned special ids that ProgressBar searches for and handles specifically instead of the whole Drawable if the Drawable happens to be a layer-list.

In your case, since the progress increments aren't all equal, you can use a level-list drawable container as your progress layer, and provide assets for all your progress increments to it. Alternatively, if you wish to make it dynamic, you can create a custom Drawable subclass with the appropriate drawing logic based on it's level.

Here is a sample XML for the progress Drawable resource using a level-list:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background"
          android:drawable="@drawable/progress_bg" />
    <item android:id="@android:id/progress">
        <level-list>
            <item android:drawable="@android:color/transparent" />
            <item android:drawable="@drawable/progress_1" />
            <item android:drawable="@drawable/progress_2" />
            <item android:drawable="@drawable/progress_3" />
        </level-list>
    </item>
</layer-list>


* You can find the original non-Holo version here, and the Holo versions here and here.
** You can find a list of the standard framework Drawables that can be defined in XML here.



标签： android progress-bar android-custom-view
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