Java 如何将自定义视图添加到布局?
我有一个自定义视图Java 如何将自定义视图添加到布局?,java,android,layout,view,Java,Android,Layout,View,我有一个自定义视图 public GraphView(Context context, float[] values, String title, String[]horlabels, String[] verlabels, boolean type, int color) { super(context); if (values == null) this.values = new float[0]; else this.value
public GraphView(Context context, float[] values, String title, String[]horlabels, String[] verlabels, boolean type, int color) {
super(context);
if (values == null)
this.values = new float[0];
else
this.values = values;
if (title == null)
title = "";
else
this.title = title;
if (horlabels == null)
this.horlabels = new String[0];
else
this.horlabels = horlabels;
if (verlabels == null)
this.verlabels = new String[0];
else
this.verlabels = verlabels;
this.type = type;
paint = new Paint();
this.color = color;
}
@Override
protected void onDraw(Canvas canvas) {
float border = 20;
float horstart = border * 2;
float height = getHeight();
float width = getWidth() - 1;
float max = getMax();
float min = getMin();
float diff = max - min;
float graphheight = height - (2 * border);
float graphwidth = width - (2 * border);
paint.setTextAlign(Align.LEFT);
int vers = verlabels.length - 1;
for (int i = 0; i < verlabels.length; i++) {
paint.setColor(Color.DKGRAY);
float y = ((graphheight / vers) * i) + border;
canvas.drawLine(horstart, y, width, y, paint);
paint.setColor(Color.BLACK);
canvas.drawText(verlabels[i], 0, y, paint);
}
int hors = horlabels.length - 1;
for (int i = 0; i < horlabels.length; i++) {
paint.setColor(Color.DKGRAY);
float x = ((graphwidth / hors) * i) + horstart;
canvas.drawLine(x, height - border, x, border, paint);
paint.setTextAlign(Align.CENTER);
if (i==horlabels.length-1)
paint.setTextAlign(Align.RIGHT);
if (i==0)
paint.setTextAlign(Align.LEFT);
paint.setColor(Color.BLACK);
canvas.drawText(horlabels[i], x, height - 4, paint);
}
paint.setTextAlign(Align.CENTER);
canvas.drawText(title, (graphwidth / 2) + horstart, border - 4, paint);
if (max != min) {
paint.setColor(color);
if (type == BAR) {
float datalength = values.length;
float colwidth = (width - (2 * border)) / datalength;
for (int i = 0; i < values.length; i++) {
float val = values[i] - min;
float rat = val / diff;
float h = graphheight * rat;
canvas.drawRect((i * colwidth) + horstart, (border - h) + graphheight, ((i * colwidth) + horstart) + (colwidth - 1), height - (border - 1), paint);
}
} else {
float datalength = values.length;
float colwidth = (width - (2 * border)) / datalength;
float halfcol = colwidth / 2;
float lasth = 0;
for (int i = 0; i < values.length; i++) {
float val = values[i] - min;
float rat = val / diff;
float h = graphheight * rat;
if (i > 0)
canvas.drawLine(((i - 1) * colwidth) + (horstart + 1) + halfcol, (border - lasth) + graphheight, (i * colwidth) + (horstart + 1) + halfcol, (border - h) + graphheight, paint);
lasth = h;
}
}
}
}
private float getMax() {
float largest = Integer.MIN_VALUE;
for (int i = 0; i < values.length; i++)
if (values[i] > largest)
largest = values[i];
return largest;
}
private float getMin() {
float smallest = Integer.MAX_VALUE;
for (int i = 0; i < values.length; i++)
if (values[i] < smallest)
smallest = values[i];
return smallest;
}
这是不可能的
Error:07-12 11:07:38.933: ERROR/AndroidRuntime(30488): java.lang.RuntimeException: Unable to resume activity {com.meters.src/com.meters.src.Main_Activity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
视图翻转器中包含的RelativeLayout
。如何将视图添加到此布局?您不必使用代码添加视图,您可以像任何android视图一样使用xml进行添加:
在您的情况下,只需在不需要查看的xml中添加以下代码
<com.your.package.GraphView android:id="@+id/myGraphView" />
视图只能有一个父视图。您正在添加的视图(我猜您正在使用ie.graphView)已经是另一个视图层次结构的一部分。如果您真的想重用它(我建议您可能不这样做),那么您必须将其从现有视图层次结构中的父视图中分离出来。添加如下代码行:
diagramRelativeLayout = (RelativeLayout)switcher.getChildAt(i).findViewById(R.id.diagramRelativeLayout);
diagramRelativeLayout.removeAllViewsInLayout(); // <-- Add this and try
diagramRelativeLayout.addView(graphView);
diagramRelativeLayout=(RelativeLayout)切换器.getChildAt(i).findViewById(R.id.diagramRelativeLayout);
diagramRelativeLayout.removeAllViewsInLayout();// 我做到了,我只是用一个布局创建了xml,并在diagramRelativeLayout中添加了对它的引用:
我的xml:
<RelativeLayout
android:id = "@+id/diagramRelativeLayout"
android:background="@layout/button_style"
android:layout_width="fill_parent"
android:layout_height = "fill_parent"
android:layout_marginTop = "10sp"
android:layout_marginLeft = "5sp"
android:layout_marginRight = "5sp"
android:layout_marginBottom = "10sp"
android:gravity="center">
<include android:id="@+id/graph" layout="@layout/graph"/>
</RelativeLayout>
graphLayout = (RelativeLayout)switcher.getChildAt(i).findViewById(R.id.graph);
graphLayout.addView(graphView);
07-12 15:15:59.133:ERROR/AndroidRuntime(31020):java.lang.RuntimeException:无法恢复活动{com.meters.src/com.meters.src.Main_activity}:android.view.InflateException:二进制XML文件行#136:错误膨胀类com.meters.src.graphView检查您已经在diagramRelativeLayout.addView(graphView)之外的其他地方添加了此graphView;我只在oncreate()graphView=newgraphview(上下文、值、“每周使用量(kW)”、horlabels、verlabels、graphView.BAR、Color.RED)中初始化它代码>此方法,返回ViewFlipper的子级。
<RelativeLayout
android:id = "@+id/diagramRelativeLayout"
android:background="@layout/button_style"
android:layout_width="fill_parent"
android:layout_height = "fill_parent"
android:layout_marginTop = "10sp"
android:layout_marginLeft = "5sp"
android:layout_marginRight = "5sp"
android:layout_marginBottom = "10sp"
android:gravity="center">
<include android:id="@+id/graph" layout="@layout/graph"/>
</RelativeLayout>
graphLayout = (RelativeLayout)switcher.getChildAt(i).findViewById(R.id.graph);
graphLayout.addView(graphView);