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這篇文章給大家介紹怎么在Android中通過自定義控件實現一個折線圖，內容非常詳細，感興趣的小伙伴們可以參考借鑒，希望對大家能有所幫助。
Android是一種基于Linux內核的自由及開放源代碼的操作系統，主要使用于移動設備，如智能手機和平板電腦，由美國Google公司和開放手機聯盟領導及開發。
首先是控件繪圖區域的劃分，控件左邊取一小部分（控件總寬度的八分之一）繪制表頭，右邊剩余的部分繪制表格
確定表格的行列數，首先繪制一個三行八列的網格，設置好行列的坐標后開始繪制
/*繪制三條橫線*/
for(int i=0;i<3;i++){
canvas.drawLine(textWide, mLineYs[i], totalWidth, mLineYs[i], mPaintLine);
}
/*繪制八條豎線*/
for(int i=0;i<8;i++){
canvas.drawLine(mLineXs[i], 0, mLineXs[i], totalHeight, mPaintLine);
}網格繪制完成后，開始繪制折線圖
根據輸入的節點數據，分別繪制兩條折線
通過canvas的drawLine方法依次連接兩點即可
在每個數據節點處繪制一個小圓，突出顯示
/*繪制第一條折線的路徑*/
for (int i = 0; i < mPerformance_1.length - 1; i++) {
/*折線圖的折線的畫筆設置粗一點*/
mPaintLine.setStrokeWidth(5);
/*計算當前節點的坐標值*/
float prePointX =mLineXs[i];
float prePointY =mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i].type]) * animCurrentValue;
/*計算下一個節點的坐標值*/
float nextPointX=mLineXs[i + 1];
float nextPointY=mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i + 1].type]) * animCurrentValue;
/*連接當前坐標和下一個坐標，繪制線段*/
canvas.drawLine(prePointX, prePointY, nextPointX, nextPointY, mPaintLine1);
/*當前節點坐標處繪制小圓*/
canvas.drawCircle(prePointX, prePointY, mSmallDotRadius, mPointPaint);
}兩條折線重合的地方，需要特殊考慮，比如希望兩條折線重合的地方折線變為白色
設置下兩條折線的畫筆即可
mPaintLine2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN)); mPaintLine1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
測試代碼及效果;
final Random random=new Random();
final LineChartView myView=(LineChartView)findViewById(R.id.custom_view);
final LineChartView.Performance[] performances1=new LineChartView.Performance[8];
final LineChartView.Performance[] performances2=new LineChartView.Performance[8];
myView.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
for(int i=0;i<performances1.length;i++){
switch (random.nextInt(2016)%3){
case 0:
performances1[i]= LineChartView.Performance.WIN;
break;
case 1:
performances1[i]= LineChartView.Performance.DRAW;
break;
case 2:
performances1[i]= LineChartView.Performance.LOSE;
break;
default:
performances1[i]= LineChartView.Performance.LOSE;
break;
}
switch (random.nextInt(2016)%3){
case 0:
performances2[i]= LineChartView.Performance.WIN;
break;
case 1:
performances2[i]= LineChartView.Performance.DRAW;
break;
case 2:
performances2[i]= LineChartView.Performance.LOSE;
break;
default:
performances1[i]= LineChartView.Performance.LOSE;
break;
}
}
myView.setPerformances(performances1,performances2);
}
});
完整代碼如下：
public class LineChartView extends View {
private Context context;
/*動畫插值器*/
DecelerateInterpolator mDecelerateInterpolator = new DecelerateInterpolator();
/*動畫刷新的次數*/
private int mDuration = 10;
/*當前動畫進度值*/
private int mCurrentTime = 0;
private Performance[] mPerformance_1, mPerformance_2;
/*兩條折線的顏色*/
private int mLineColor1, mLineColor2;
/*繪制表頭文字畫筆*/
private Paint mPaintText = new Paint();
/*繪制表格的畫筆*/
private Paint mPaintLine = new Paint();
/*第一條折線的畫筆*/
private Paint mPaintLine1 =new Paint();
/*第二條折線的畫筆*/
private Paint mPaintLine2 =new Paint();
/*坐標點的小圓點畫筆*/
private Paint mPointPaint = new Paint();
private float mSmallDotRadius = 4;
private TypedValue typedValue;
private int mPaintClolor;
/*Handler刷新界面產生動畫效果*/
private Handler mHandler = new Handler();
private Runnable mAnimation = new Runnable() {
@Override
public void run() {
if (mCurrentTime < mDuration) {
mCurrentTime++;
LineChartView.this.invalidate();
}
}
};
public LineChartView(Context context) {
super(context);
this.context=context;
init();
}
public LineChartView(Context context, AttributeSet attrs) {
super(context, attrs);
this.context=context;
init();
}
public LineChartView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context=context;
init();
}
public enum Performance {
WIN(0),
DRAW(1),
LOSE(2);
public int type;
Performance(int type) {
this.type = type;
}
}
public void setPerformances(Performance[] performance1, Performance[] performance2) {
if (performance1 == null) {
performance1 = new Performance[0];
}
if (performance2 == null) {
performance2 = new Performance[0];
}
mPerformance_1 = Arrays.copyOf(performance1, performance1.length > 8 ? 8 : performance1.length);
mPerformance_2 = Arrays.copyOf(performance2, performance2.length > 8 ? 8 : performance2.length);
if (isShown()) {
mCurrentTime = 0;
this.invalidate();
}
}
/**
* 設置折線1的顏色
*
* @param mLineColor1
*/
public void setLineColor1(int mLineColor1) {
this.mLineColor1 = mLineColor1;
}
/**
* 設置折線2的顏色
*
* @param mLineColor2
*/
public void setLineColor2(int mLineColor2) {
this.mLineColor2 = mLineColor2;
}
private void init() {
mLineColor1=Color.BLUE;
mLineColor2 = Color.GREEN;
typedValue=new TypedValue();
context.getTheme().resolveAttribute(R.attr.title_bar,typedValue,true);
mPaintClolor =getResources().getColor(typedValue.resourceId);
final LineChartView.Performance[] performances1=new LineChartView.Performance[8];
final LineChartView.Performance[] performances2=new LineChartView.Performance[8];
final Random random=new Random();
for(int i=0;i<performances1.length;i++){
switch (random.nextInt(2016)%3){
case 0:
performances1[i]= LineChartView.Performance.WIN;
break;
case 1:
performances1[i]= LineChartView.Performance.DRAW;
break;
case 2:
performances1[i]= LineChartView.Performance.LOSE;
break;
default:
performances1[i]= LineChartView.Performance.LOSE;
break;
}
switch (random.nextInt(2016)%3){
case 0:
performances2[i]= LineChartView.Performance.WIN;
break;
case 1:
performances2[i]= LineChartView.Performance.DRAW;
break;
case 2:
performances2[i]= LineChartView.Performance.LOSE;
break;
default:
performances1[i]= LineChartView.Performance.LOSE;
break;
}
}
setPerformances(performances1,performances2);
}
/**
* @param canvas
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/*獲取控件總寬高*/
float totalWidth = getWidth();
float totalHeight = getHeight();
/*左邊取總寬度的八分之一繪制表格頭部*/
float textWide = totalWidth / 8;
/*左邊留一點空白*/
float left_offset = 10;
/*折線圖的總寬度等于控件的總寬度減去表頭和留白*/
float chartWide = totalWidth - textWide - left_offset;
/*一共三行，設置每一行的垂直坐標*/
float[] mLineYs = new float[]{totalHeight / 8, totalHeight / 2, totalHeight * 7 / 8};
/*一共八列，設置每一列的水平坐標*/
float[] mLineXs = new float[]{
textWide + left_offset + chartWide * 0 / 8,
textWide + left_offset + chartWide * 1 / 8,
textWide + left_offset + chartWide * 2 / 8,
textWide + left_offset + chartWide * 3 / 8,
textWide + left_offset + chartWide * 4 / 8,
textWide + left_offset + chartWide * 5 / 8,
textWide + left_offset + chartWide * 6 / 8,
textWide + left_offset + chartWide * 7 / 8,
};
/*繪制表頭文字*/
mPaintText.setStyle(Paint.Style.FILL);
mPaintText.setColor(mPaintClolor);
mPaintText.setAlpha(226);
mPaintText.setTextSize(28);
/*從中間開始繪制*/
mPaintText.setTextAlign(Paint.Align.CENTER);
/*測量文字大小，并計算偏移量*/
Paint.FontMetrics fontMetrics = mPaintText.getFontMetrics();
float textBaseLineOffset = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom;
canvas.drawText("勝場", textWide / 2, mLineYs[0] + textBaseLineOffset, mPaintText);
canvas.drawText("平局", textWide / 2, mLineYs[1] + textBaseLineOffset, mPaintText);
canvas.drawText("負場", textWide / 2, mLineYs[2] + textBaseLineOffset, mPaintText);
/*繪制表格畫筆設置*/
mPaintLine.setStyle(Paint.Style.STROKE);
mPaintLine.setAntiAlias(true);
mPaintLine.setColor(mPaintClolor);
mPaintLine.setAlpha(80);
mPaintLine.setStrokeWidth(1);
/*開始繪制表格*/
/*繪制三條橫線*/
for(int i=0;i<3;i++){
canvas.drawLine(textWide, mLineYs[i], totalWidth, mLineYs[i], mPaintLine);
}
/*繪制八條豎線*/
for(int i=0;i<8;i++){
canvas.drawLine(mLineXs[i], 0, mLineXs[i], totalHeight, mPaintLine);
}
/*折線圖畫筆設置*/
mPaintLine1.setStyle(Paint.Style.STROKE);
/*設置透明度，取值范圍為0~255，數值越小越透明，0表示完全透明*/
mPaintLine1.setAlpha(0);
mPaintLine1.setAntiAlias(true);
mPaintLine1.setColor(mLineColor1);
mPaintLine1.setStrokeWidth(5);
mPaintLine2.setStyle(Paint.Style.STROKE);
/*設置透明度，取值范圍為0~255，數值越小越透明，0表示完全透明*/
mPaintLine2.setAlpha(0);
mPaintLine2.setAntiAlias(true);
mPaintLine2.setColor(mLineColor2);
mPaintLine2.setStrokeWidth(5);
if (typedValue.resourceId==R.color.white){
/*PorterDuff.Mode.SCREEN 上下層都顯示。*/
mPaintLine2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
mPaintLine1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
}else {
/*PorterDuff.Mode.DARKEN 上下層都顯示。變暗*/
mPaintLine2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DARKEN));
mPaintLine1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DARKEN));
}
/*畫節點處的小圓點的畫筆設置*/
mPointPaint.setStyle(Paint.Style.STROKE);
mPointPaint.setAntiAlias(true);
mPointPaint.setColor(mPaintClolor);
/*計算當前動畫進度對應的數值*/
float animCurrentValue = mDecelerateInterpolator.getInterpolation(1.0f * mCurrentTime / mDuration);
mPaintLine.setColor(mLineColor1);
/*繪制第一條折線的路徑*/
for (int i = 0; i < mPerformance_1.length - 1; i++) {
/*折線圖的折線的畫筆設置粗一點*/
mPaintLine.setStrokeWidth(5);
/*計算當前節點的坐標值*/
float prePointX =mLineXs[i];
float prePointY =mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i].type]) * animCurrentValue;
/*計算下一個節點的坐標值*/
float nextPointX=mLineXs[i + 1];
float nextPointY=mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i + 1].type]) * animCurrentValue;
/*連接當前坐標和下一個坐標，繪制線段*/
canvas.drawLine(prePointX, prePointY, nextPointX, nextPointY, mPaintLine1);
/*當前節點坐標處繪制小圓*/
canvas.drawCircle(prePointX, prePointY, mSmallDotRadius, mPointPaint);
}
/*第一個折線圖的最后一個節點的坐標*/
float lastPointX=mLineXs[mPerformance_1.length - 1];
float lastPointY= mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[mPerformance_1.length - 1].type]) * animCurrentValue;
/*繪制最后一個節點的外圍小圓*/
canvas.drawCircle(lastPointX,lastPointY ,mSmallDotRadius, mPointPaint);
/*繪制第二條折線*/
mPaintLine.setColor(mLineColor2);
for (int i = 0; i < mPerformance_2.length - 1; i++) {
/*折線圖的折線的畫筆設置粗一點*/
mPaintLine.setStrokeWidth(5);
/*計算當前節點的坐標值*/
float prePointX =mLineXs[i];
float prePointY =mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_2[i].type]) * animCurrentValue;
/*計算下一個節點的坐標值*/
float nextPointX=mLineXs[i + 1];
float nextPointY=mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_2[i + 1].type]) * animCurrentValue;
/*連接當前坐標和下一個坐標，繪制線段*/
canvas.drawLine(prePointX, prePointY, nextPointX, nextPointY, mPaintLine2);
/*當前節點坐標處繪制小圓*/
canvas.drawCircle(prePointX, prePointY, mSmallDotRadius, mPointPaint);
}
/*第一個折線圖的最后一個節點的坐標*/
lastPointX=mLineXs[mPerformance_2.length - 1];
lastPointY= mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_2[mPerformance_2.length - 1].type]) * animCurrentValue;
/*繪制最后一個節點的外圍小圓*/
canvas.drawCircle(lastPointX,lastPointY ,mSmallDotRadius, mPointPaint);
mHandler.postDelayed(mAnimation, 20);
}
}關于怎么在Android中通過自定義控件實現一個折線圖就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。
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