我搜索了许多示例代码,但找不到任何实时运行图。我试图创建一个示例图,但是我的代码出现问题。在创建画布时,我只能绘制2个点,但是我需要绘制一个点数组。所以我创建了一个Points数组,但是代码无法正常工作。
这是我的视图类:
public class DemoView extends View {
private final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint paint1 = new Paint(Paint.ANTI_ALIAS_FLAG);
int x = getHeight() / 2;
int i = 0;
//graph point
int[] a = {20, 50, 40, 65, 56, 43, 22, 23, 55, 77, 76,
25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 150,
150, 150, 150, 150, 150, 150, 20, 20, 20, 20, 20,
20, 20, 150, 52, 52, 52, 52, 52, 52, 52, 52, 52,
52, 52, 52, 52, 52, 52, 30, 30, 30, 30, 30, 30,
30, 30, 30, 30, 30, 100, 100, 100, 100, 100, 100,
100, 100, 100, 22, 22, 22, 22, 50, 50, 50};
public DemoView(Context context) {
super(context);
init();
}
public DemoView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DemoView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
public void init() {
paint.setColor(Color.GREEN);
paint1.setColor(Color.RED);
}
@Override
protected synchronized void onDraw(Canvas canvas) {
super.onDraw(canvas);
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
//Identification the graph current position
canvas.drawRect(x, 0, x + 5, getHeight(), paint);
if (i != 0) {
//drawing the graph
canvas.drawLine(x, (getHeight() / 2) - a[i], x + 1, (getHeight() / 2) - a[i - 1], paint1);
}
i++;
// length of array value
if (i == 79) {
i = 0;
}
//repaint area
if (x > getWidth() - 25) {
if (x > getWidth() - 25) {
x = 35;
}
}
x += 2;
invalidate();
}}
活动
public class LineView extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_line_view);
}}
视图
<LinearLayout android:orientation="vertical"
android:layout_height="350dp"
android:layout_width="fill_parent">
<com.akasmedical.android.linedrawing.DemoView
android:layout_height="match_parent"
android:layout_width="wrap_content"/>
`
我的输出:
最佳答案
@Override
public synchronized void onDraw(final Canvas canvas) {
int n = 35;
int j = 1;
canvas.drawRect(0, 0, getWidth(), getHeight(), paint);
if (i != 0) {
for (j = 1; j <= i; j++) {
if (n > getWidth() - 25) {
n = 36;
k = n;
//drawPulseIterator=k;
} else {
n += 1;
}
canvas.drawRect(k++, 0, n + 5, getHeight(), paint);
canvas.drawLine(n, (getHeight() / 2) - a[j], n + 1, (getHeight() / 2) - a[j - 1], paint1);
}
}
i++;
if (j == a.length) {
i = 0;
}
invalidate();
}