首先贴一张可爱的Google Doodle：
自定义ProgressBar显示百分比，效果图：
代码实现：
package com.demo.progressbarwithpercent.view;
import com.demo.progressbarwithpercent.R;
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 ProgressBarWithPercent extends View {
private int mMaxProgress = 100;
/** * Current progress, can not exceed the max progress. */
private int mCurrentProgress = 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_VISIBILITY = "text_visibility";
private static final int PROGRESS_TEXT_VISIBLE = 0;
/** * 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 Paint of the unreached area. */
private Paint mUnreachedBarPaint;
/** * The Paint 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;
/** * Listener */
private OnProgressBarListener mListener;
public enum ProgressTextVisibility {
Visible, Invisible
}
public ProgressBarWithPercent(Context context) {
this(context, null);
}
public ProgressBarWithPercent(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ProgressBarWithPercent(Context context, AttributeSet attrs,
int defStyleAttr) {
super(context, attrs, defStyleAttr);
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.ProgressBarWithPercent, defStyleAttr, 0);
mReachedBarColor = attributes.getColor(
R.styleable.ProgressBarWithPercent_progress_reached_color,
default_reached_color);
mUnreachedBarColor = attributes.getColor(
R.styleable.ProgressBarWithPercent_progress_unreached_color,
default_unreached_color);
mTextColor = attributes.getColor(
R.styleable.ProgressBarWithPercent_progress_text_color,
default_text_color);
mTextSize = attributes.getDimension(
R.styleable.ProgressBarWithPercent_progress_text_size,
default_text_size);
mReachedBarHeight = attributes.getDimension(
R.styleable.ProgressBarWithPercent_progress_reached_bar_height,
default_reached_bar_height);
mUnreachedBarHeight = attributes
.getDimension(
R.styleable.ProgressBarWithPercent_progress_unreached_bar_height,
default_unreached_bar_height);
mOffset = attributes.getDimension(
R.styleable.ProgressBarWithPercent_progress_text_offset,
default_progress_text_offset);
int textVisible = attributes.getInt(
R.styleable.ProgressBarWithPercent_progress_text_visibility,
PROGRESS_TEXT_VISIBLE);
if (textVisible != PROGRESS_TEXT_VISIBLE) {
mIfDrawText = false;
}
setProgress(attributes.getInt(
R.styleable.ProgressBarWithPercent_progress_current, 0));
setMax(attributes.getInt(
R.styleable.ProgressBarWithPercent_progress_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 mCurrentProgress;
}
public int getMax() {
return mMaxProgress;
}
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(mUnreachedBarColor);
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 maxProgress) {
if (maxProgress > 0) {
this.mMaxProgress = maxProgress;
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);
}
if (mListener != null) {
mListener.onProgressChange(getProgress(), getMax());
}
}
public void setProgress(int progress) {
if (progress <= getMax() && progress >= 0) {
this.mCurrentProgress = 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_VISIBILITY, 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_VISIBILITY) ? 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;
}
public void setOnProgressBarListener(OnProgressBarListener listener) {
mListener = listener;
}
}
代码正在上传，稍后更新。
源码下载：
ProgressBarWithPercent