我在 android 开发场景中相当新,但是我已经完成了一些简单的应用程序来了解工作流程在环境中的样子。
我在运行名为 SimpleXYPlotExample 的示例程序时遇到了困难,这里分别是代码、清单、main.xml 和 activity.java。我知道这是某种用户错误,但如果有人能给我一些有用的指示,说明我做错了什么,那就太好了。
起初,所有代码都被破坏了,但我意识到我忘了导入库。现在我已经这样做了,我尝试在我的 nexus 上运行程序,它在进入它时就崩溃了。
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="6"
android:targetSdkVersion="16"/>
<application android:label="SimpleXYPlotExample"
android:icon="@drawable/icon"
android:debuggable="true"
android:hardwareAccelerated="false">
<activity android:name=".MyActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.androidplot.xy.XYPlot
android:id="@+id/mySimpleXYPlot"
android:layout_width="fill_parent"
android:layout_height="150px"
android:layout_marginTop="10px"
android:layout_marginLeft="10px"
android:layout_marginRight="10px"
andsroidplot.title="A Simple XYPlot Example"
androidplot.ticksPerRangeLabel="4"
androidplot.ticksPerDomainLabel="2"
androidplot.gridPadding="4dp|4dp|4dp|4dp"
/>
</LinearLayout>
package com.example;
import java.util.Arrays;
import android.app.Activity;
import android.os.Bundle;
import com.androidplot.series.XYSeries;
import com.androidplot.ui.AnchorPosition;
import com.androidplot.xy.LineAndPointFormatter;
import com.androidplot.xy.SimpleXYSeries;
import com.androidplot.xy.XLayoutStyle;
import com.androidplot.xy.XYPlot;
import com.androidplot.xy.YLayoutStyle;
public class MyActivity extends Activity
{
private XYPlot plot;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// initialize our XYPlot reference:
plot = (XYPlot) findViewById(R.id.mySimpleXYPlot);
// add a new series
XYSeries mySeries = new SimpleXYSeries(
Arrays.asList(0, 25, 55, 2, 80, 30, 99, 0, 44, 6),
SimpleXYSeries.ArrayFormat.Y_VALS_ONLY, "series1");
plot.addSeries(mySeries, new LineAndPointFormatter(
getApplicationContext(), R.xml.f1));
// reposition the domain label to look a little cleaner:
plot.position(plot.getDomainLabelWidget(), // the widget to position
45, // x position value, in this case 45 pixels
XLayoutStyle.ABSOLUTE_FROM_LEFT, // how the x position value is applied, in this case from the left
0, // y position value
YLayoutStyle.ABSOLUTE_FROM_BOTTOM, // how the y position is applied, in this case from the bottom
AnchorPosition.LEFT_BOTTOM); // point to use as the origin of the widget being positioned
plot.centerOnRangeOrigin(60);
plot.centerOnDomainOrigin(5);
}
}
这可能是由于绘图甚至没有出现在图形布局上。这就是这段代码的样子:
如您所见,我已经导入了 androidplot 库。请指教。