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怎么在Android中通過自定義View實現(xiàn)一個炫酷的進度條?相信很多沒有經(jīng)驗的人對此束手無策,為此本文總結(jié)了問題出現(xiàn)的原因和解決方法,通過這篇文章希望你能解決這個問題。
第一步:創(chuàng)建attrs文件夾,自定義屬性:
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MyProgress"> <attr name="out_color" format="color"/> <attr name="inner_color" format="color"/> <attr name="border_width" format="dimension"/> <attr name="text_color" format="color"/> <attr name="text_size" format="dimension"/> </declare-styleable> </resources>
第二步:自定義View:
/** * Created by Michael on 2019/11/1. */ public class MyProgress extends View { private int outColor; private int innerColor; private int textColor; private float borderWidth; private int textSize; private Paint mOutPaint; private Paint mInnerPaint; private Paint mTextPaint; private float percent; private int p; public MyProgress(Context context) { this(context,null); } public MyProgress(Context context, @Nullable AttributeSet attrs) { this(context, attrs,0); } public MyProgress(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.MyProgress); outColor = array.getColor(R.styleable.MyProgress_out_color, Color.GREEN); innerColor = array.getColor(R.styleable.MyProgress_inner_color, Color.BLUE); textColor = array.getColor(R.styleable.MyProgress_text_color, Color.BLACK); borderWidth = array.getDimension(R.styleable.MyProgress_border_width,10); textSize = array.getDimensionPixelSize(R.styleable.MyProgress_text_size,20); array.recycle(); init(); } private void init() { mOutPaint = new Paint(); mOutPaint.setAntiAlias(true); mOutPaint.setDither(true); mOutPaint.setStyle(Paint.Style.STROKE); mOutPaint.setStrokeWidth(borderWidth); mOutPaint.setColor(outColor); mInnerPaint = new Paint(); mInnerPaint.setAntiAlias(true); mInnerPaint.setDither(true); mInnerPaint.setStyle(Paint.Style.STROKE); mInnerPaint.setStrokeWidth(borderWidth); mInnerPaint.setColor(innerColor); mTextPaint = new Paint(); mTextPaint.setAntiAlias(true); mTextPaint.setDither(true); mTextPaint.setStyle(Paint.Style.FILL); mTextPaint.setTextSize(textSize); mTextPaint.setColor(textColor); percent = 0; p = 100; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int width = 0,height =0; if (widthMode == MeasureSpec.AT_MOST){ }else{ width = MeasureSpec.getSize(widthMeasureSpec); } if (heightMode == MeasureSpec.AT_MOST){ }else{ height = MeasureSpec.getSize(heightMeasureSpec); } setMeasuredDimension(width>height?height:width,width>height?height:width); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int rWidth = getWidth()>getHeight()?getHeight():getWidth(); int rHeight = getWidth()>getHeight()?getHeight():getWidth(); //int rWidth = getWidth(); //int rHeight = getHeight(); float radius = rWidth/2 - borderWidth/2; canvas.drawCircle(rWidth/2,rHeight/2,radius,mOutPaint); RectF r = new RectF(borderWidth/2,borderWidth/2, rWidth-borderWidth/2,rHeight-borderWidth/2); canvas.drawArc(r,0,360*percent,false,mInnerPaint); String s1 = (int)(percent*100) + "%"; Rect r2 = new Rect(); mTextPaint.getTextBounds(s1,0,s1.length(),r2); int tWidth = r2.width(); int tHeight = r2.height(); Paint.FontMetricsInt fontMetricsInt = new Paint.FontMetricsInt(); int dy = (fontMetricsInt.bottom-fontMetricsInt.top)/2-fontMetricsInt.bottom; int baseLine = tHeight/2+dy+rHeight/2-tHeight/2; int x0 = rWidth/2-tWidth/2; canvas.drawText(s1,x0,baseLine,mTextPaint); } public void setProgress(float percent,int value){ this.percent = percent; invalidate(); } }
然后在布局中使用:
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.michael.view_02.MainActivity"> <com.example.michael.view_02.MyProgress android:id="@+id/progress" android:layout_width="match_parent" android:layout_height="match_parent" app:out_color="@color/colorPrimary" app:inner_color="@color/colorAccent" app:text_color="@color/colorPrimaryDark" app:border_width="10dp" app:text_size="20sp" /> </android.support.constraint.ConstraintLayout>
在activity中使用屬性動畫完成效果:
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final MyProgress progress = findViewById(R.id.progress); ValueAnimator animator = ValueAnimator.ofInt(0,5000); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { float p = animation.getAnimatedFraction(); int value = (int)animation.getAnimatedValue(); progress.setProgress(p,value); } }); animator.setDuration(10000); animator.start(); } }
如果我們改動一下代碼:
//int rWidth = getWidth(); //int rHeight = getHeight();
看完上述內(nèi)容,你們掌握怎么在Android中通過自定義View實現(xiàn)一個炫酷的進度條的方法了嗎?如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容,歡迎關(guān)注億速云行業(yè)資訊頻道,感謝各位的閱讀!
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