打造炫酷進度條
阿新 • • 發佈：2019-02-19
如何自定義控制元件
1.自定義屬性的宣告與獲取
2.測量onMeasure
3.佈局onLayout（ViewGroup）
4.繪製onDraw
5.onTouchEvent
6.onInterceptTouchEvent（ViewGroup）
7.狀態的恢復與儲存
自定義屬性的宣告與獲取
1.分析需要的自定義屬性
2.在res/values/attrs.xml定義宣告
3.在layout檔案中進行使用
4.在View的構造方法中進行獲取
條形進度條
attrs.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <attr name="progress_unreach_color" format="color"></attr> <attr name="progress_unreach_height" format="dimension"></attr> <attr name="progress_reach_color" format="color"></attr> <attr name="progress_reach_height" format="dimension"></attr> <attr name="progress_text_color" format="color"></attr> <attr name="progress_text_size" format="dimension"></attr> <attr name="progress_text_offset" format="dimension"></attr> <declare-styleable name="HorizontalProgressBarWithProgress"> <attr name="progress_unreach_color"></attr> <attr name="progress_unreach_height"></attr> <attr name="progress_reach_color"></attr> <attr name="progress_reach_height"></attr> <attr name="progress_text_color"></attr> <attr name="progress_text_size"></attr> <attr name="progress_text_offset"></attr> </declare-styleable> </resources>
HorizontalProgressBarWithProgress.java
public class HorizontalProgressBarWithProgress extends ProgressBar { private static final int DEFAULT_TEXT_SIZE = 10; // sp private static final int DEFAULT_TEXT_COLOR = 0xFFFC00D1; private static final int DEFAULT_COLOR_UNREACH = 0xFFD3D6DA; private static final int DEFAULT_HEIGHT_UNREACH = 2; // dp private static final int DEFAULT_COLOR_REACH = DEFAULT_TEXT_COLOR; private static final int DEFAULT_HEIGHT_REACH = 2; // dp private static final int DEFAULT_TEXT_OFFSET = 10; // dp private int mTextSize = sp2px(DEFAULT_TEXT_SIZE); private int mTextColor = DEFAULT_TEXT_COLOR; private int mUnReachColor = DEFAULT_COLOR_UNREACH; private int mUnReachHeight = dp2px(DEFAULT_HEIGHT_UNREACH); private int mReachColor = DEFAULT_COLOR_REACH; private int mReachHeight = dp2px(DEFAULT_HEIGHT_REACH); private int mTextOffset = dp2px(DEFAULT_TEXT_OFFSET); private Paint mPaint = new Paint(); /** * 在onMeasure中初始化 * 在onDraw中使用 */ private int mRealWidth; public HorizontalProgressBarWithProgress(Context context) { this(context, null); } public HorizontalProgressBarWithProgress(Context context, AttributeSet attrs) { this(context, attrs, 0); } public HorizontalProgressBarWithProgress(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); //獲取自定義屬性 obtainStyledAttrs(attrs); } /** * 獲取自定義屬性 * * @param attrs */ private void obtainStyledAttrs(AttributeSet attrs) { TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.HorizontalProgressBarWithProgress); mTextSize = (int) ta.getDimension( R.styleable.HorizontalProgressBarWithProgress_progress_text_size, mTextSize); mTextColor = ta.getColor( R.styleable.HorizontalProgressBarWithProgress_progress_text_color, mTextColor); mTextOffset = (int) ta.getDimension( R.styleable.HorizontalProgressBarWithProgress_progress_text_offset, mTextOffset); mUnReachColor = ta.getColor( R.styleable.HorizontalProgressBarWithProgress_progress_unreach_color, mUnReachColor); mUnReachHeight = (int) ta.getDimension( R.styleable.HorizontalProgressBarWithProgress_progress_unreach_height, mUnReachHeight); mReachColor = ta.getColor( R.styleable.HorizontalProgressBarWithProgress_progress_reach_color, mReachColor); mReachHeight = (int) ta.getDimension( R.styleable.HorizontalProgressBarWithProgress_progress_reach_height, mReachHeight); ta.recycle(); mPaint.setTextSize(mTextSize); } @Override protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthVal = MeasureSpec.getSize(widthMeasureSpec); int height = measureHeight(heightMeasureSpec); //確定view的寬和高 setMeasuredDimension(widthVal, height); mRealWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight(); } private int measureHeight(int heightMeasureSpec) { int result = 0; int mode = MeasureSpec.getMode(heightMeasureSpec); int size = MeasureSpec.getSize(heightMeasureSpec); //精確值（如match_parent、200dp一類） if (mode == MeasureSpec.EXACTLY) { result = size; } else { //當前繪製底線（descent） 當前繪製頂線（ascent） ascent為負值 //結果為文字的高度 int textHeight = (int) (mPaint.descent() - mPaint.ascent()); result = getPaddingTop() + getPaddingBottom() + Math.max(Math.max(mReachHeight, mUnReachHeight), Math.abs(textHeight)); //測量值不能超過給定的size值 if (mode == MeasureSpec.AT_MOST) { return Math.min(result, size); } } return result; } @Override protected synchronized void onDraw(Canvas canvas) { canvas.save(); canvas.translate(getPaddingLeft(), getHeight() / 2); boolean noNeedUnReach = false; //draw reach bar String text = getProgress() + "%"; int textWidth = (int) mPaint.measureText(text); float radio = getProgress() * 1.0f / getMax(); float progressX = radio * mRealWidth; if (progressX + textWidth > mRealWidth) { progressX = mRealWidth - textWidth; noNeedUnReach = true; } float endX = progressX - mTextOffset / 2; if (endX > 0) { mPaint.setColor(mReachColor); mPaint.setStrokeWidth(mReachHeight); canvas.drawLine(0, 0, endX, 0, mPaint); } //draw text mPaint.setColor(mTextColor); int y = (int) (-(mPaint.descent() + mPaint.ascent()) / 2); canvas.drawText(text, progressX, y, mPaint); //draw unreach bar if (!noNeedUnReach) { float start = progressX + mTextOffset / 2 + textWidth; mPaint.setColor(mUnReachColor); mPaint.setStrokeWidth(mUnReachHeight); canvas.drawLine(start, 0, mRealWidth, 0, mPaint); } canvas.restore(); } private int dp2px(int dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, getResources().getDisplayMetrics()); } private int sp2px(int spVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, getResources().getDisplayMetrics()); } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:liu="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <com.example.view.HorizontalProgressBarWithProgress android:id="@+id/id_progress01" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:padding="15dp" android:progress="0" liu:progress_reach_color="#ffff0000" liu:progress_text_color="#ffff0000" liu:progress_unreach_color="#44ff0000" /> <com.example.view.HorizontalProgressBarWithProgress android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:padding="15dp" android:progress="100" liu:progress_text_color="#44ff0000" liu:progress_unreach_color="#ffff0000" /> <com.example.view.HorizontalProgressBarWithProgress android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:padding="15dp" android:progress="30" liu:progress_text_color="#44ff0000" liu:progress_unreach_color="#ffff0000" /> </LinearLayout> </ScrollView>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private final int MSG_UPDATE = 0x110;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
int progress = mHProgress.getProgress();
mHProgress.setProgress(++progress);
if (progress >= 100) {
mHandler.removeMessages(MSG_UPDATE);
}
mHandler.sendEmptyMessageDelayed(MSG_UPDATE, 100);
}
};
private HorizontalProgressBarWithProgress mHProgress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHProgress = (HorizontalProgressBarWithProgress) findViewById(R.id.id_progress01);
mHandler.sendEmptyMessage(MSG_UPDATE);
}
}
圓形進度條
attrs.xml
<declare-styleable name="RoundProgressBarWithProgress">
<attr name="radius" format="dimension"></attr>
</declare-styleable>activity_main.xml
<com.example.view.RoundProgressBarWithProgress
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:padding="15dp"
android:progress="30"
liu:radius="20dp"
liu:progress_text_color="#ff000000"
liu:progress_unreach_color="#ffff0000" />
<com.example.view.RoundProgressBarWithProgress
android:id="@+id/id_progress02"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:padding="15dp"
android:progress="0"
liu:radius="60dp"
liu:progress_text_color="#ff000000"
liu:progress_text_size="30sp"
liu:progress_unreach_color="#44ff0000" />RoundProgressBarWithProgress.java
public class RoundProgressBarWithProgress extends HorizontalProgressBarWithProgress {
private int mRadius = dp2px(30);
private int mMaxPaintWidth;
public RoundProgressBarWithProgress(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RoundProgressBarWithProgress(Context context) {
this(context, null);
}
public RoundProgressBarWithProgress(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mReachHeight = (int) (mUnReachHeight * 2.5f);
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBarWithProgress);
mRadius = (int) ta.getDimension(R.styleable.RoundProgressBarWithProgress_radius, mRadius);
ta.recycle();
//設定畫筆為空心
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setAntiAlias(true);
//防抖動
mPaint.setDither(true);
//設定畫筆的筆觸風格
//ROUND 圓角的筆觸
mPaint.setStrokeCap(Paint.Cap.ROUND);
}
@Override
protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mMaxPaintWidth = Math.max(mReachHeight, mUnReachHeight);
//預設四個padding一致
int expect = mRadius * 2 + mMaxPaintWidth + getPaddingLeft() + getPaddingRight();
int width = resolveSize(expect, widthMeasureSpec);
int height = resolveSize(expect, heightMeasureSpec);
int realWidth = Math.min(width, height);
mRadius = (realWidth - getPaddingLeft() - getPaddingRight() - mMaxPaintWidth) / 2;
setMeasuredDimension(realWidth, realWidth);
}
@Override
protected synchronized void onDraw(Canvas canvas) {
String text = getProgress() + "%";
float textWidth = mPaint.measureText(text);
float textHeight = (mPaint.descent() + mPaint.ascent()) / 2;
canvas.save();
canvas.translate(getPaddingLeft() + mMaxPaintWidth / 2, getPaddingTop() + mMaxPaintWidth / 2);
mPaint.setStyle(Paint.Style.STROKE);
//draw unreach bar
mPaint.setColor(mUnReachColor);
mPaint.setStrokeWidth(mUnReachHeight);
canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
//draw reach bar
mPaint.setColor(mReachColor);
mPaint.setStrokeWidth(mReachHeight);
//弧度
float sweepAngle = getProgress() * 1.0f / getMax() * 360;
canvas.drawArc(new RectF(0, 0, mRadius * 2, mRadius * 2), 0, sweepAngle, false, mPaint);
//draw text
mPaint.setColor(mTextColor);
mPaint.setStyle(Paint.Style.FILL);
canvas.drawText(text, mRadius - textWidth / 2, mRadius - textHeight, mPaint);
canvas.restore();
}
}