Android图表库MPAndroidChart(十四)——在ListView种使用相同的图表
各位好久不见，最近挺忙的，所有博客更新的比较少，这里今天说个比较简单的图表，那就是在ListView中使用相同的图标，因为我们在下篇会讲解使用不同的图表，相同的图表还是比较简单的，我们来看下效果图
![这里写图片描述]()
具体怎么去实现呢，这里我们先写点铺垫，比如我们需要一个基类的Activity
ViewPagerBaseActivity
package com.liuguilin.mpandroidchartsample.activity;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.liuguilin.mpandroidchartsample.R;
public abstract class ViewPagerBaseActivity extends FragmentActivity {
protected String[] mMonths = new String[] {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dec"
};
protected String[] mParties = new String[] {
"Party A", "Party B", "Party C", "Party D", "Party E", "Party F", "Party G", "Party H",
"Party I", "Party J", "Party K", "Party L", "Party M", "Party N", "Party O", "Party P",
"Party Q", "Party R", "Party S", "Party T", "Party U", "Party V", "Party W", "Party X",
"Party Y", "Party Z"
};
@Override
protected void onCreate( Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
protected float getRandom(float range, float startsfrom) {
return (float) (Math.random() * range) + startsfrom;
}
@Override
public void onBackPressed() {
super.onBackPressed();
overridePendingTransition(R.anim.move_left_in_activity, R.anim.move_right_out_activity);
}
}
这个基类只是作为我们使用很多重复的东西包括年月日的换算，可以不用理会，我们本篇就只需要用到一个方法就好了，这里写了两个动画
move_left_in_activity
<?xml version="1.0" encoding="utf-8"?>
<translate
xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="300"
android:fromXDelta="-100%p"
android:toXDelta="0%p">
</translate>
move_right_out_activity
<?xml version="1.0" encoding="utf-8"?>
<translate
xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="300"
android:fromXDelta="0%p"
android:toXDelta="100%p">
</translate>
就是简单的平移动画，好的，我们正式开始实现了，在我们的xml中，我们只需要实现一个ListView就行
activity_listview_char
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@+id/mListView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
正在的逻辑其实还是在适配器的getView里
ListViewBarChartActivity
package com.liuguilin.mpandroidchartsample.activity
import android.content.Context
import android.graphics.Color
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.ListView
import com.github.mikephil.charting.charts.BarChart
import com.github.mikephil.charting.components.XAxis
import com.github.mikephil.charting.components.YAxis
import com.github.mikephil.charting.data.BarData
import com.github.mikephil.charting.data.BarDataSet
import com.github.mikephil.charting.data.BarEntry
import com.github.mikephil.charting.interfaces.datasets.IBarDataSet
import com.github.mikephil.charting.utils.ColorTemplate
import com.liuguilin.mpandroidchartsample.R
import java.util.ArrayList
import java.util.List
public class ListViewBarChartActivity extends ViewPagerBaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_listview_char)
initView()
}
private void initView() {
ListView lv = (ListView) findViewById(R.id.mListView)
ArrayList<BarData> list = new ArrayList<BarData>()
// 20 items
for (int i = 0
list.add(generateData(i + 1))
}
ChartDataAdapter cda = new ChartDataAdapter(getApplicationContext(), list)
lv.setAdapter(cda)
}
private class ChartDataAdapter extends ArrayAdapter<BarData> {
public ChartDataAdapter(Context context, List<BarData> objects) {
super(context, 0, objects)
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
BarData data = getItem(position)
ViewHolder holder = null
if (convertView == null) {
holder = new ViewHolder()
convertView = LayoutInflater.from(getContext()).inflate(R.layout.list_item_barchart, null)
holder.chart = (BarChart) convertView.findViewById(R.id.chart)
convertView.setTag(holder)
} else {
holder = (ViewHolder) convertView.getTag()
}
data.setValueTextColor(Color.BLACK)
holder.chart.getDescription().setEnabled(false)
holder.chart.setDrawGridBackground(false)
XAxis xAxis = holder.chart.getXAxis()
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM)
xAxis.setDrawGridLines(false)
YAxis leftAxis = holder.chart.getAxisLeft()
leftAxis.setLabelCount(5, false)
leftAxis.setSpaceTop(15f)
YAxis rightAxis = holder.chart.getAxisRight()
rightAxis.setLabelCount(5, false)
rightAxis.setSpaceTop(15f)
holder.chart.setData(data)
holder.chart.setFitBars(true)
holder.chart.animateY(700)
return convertView
}
private class ViewHolder {
BarChart chart
}
}
private BarData generateData(int cnt) {
ArrayList<BarEntry> entries = new ArrayList<BarEntry>()
for (int i = 0
entries.add(new BarEntry(i, (float) (Math.random() * 70) + 30))
}
BarDataSet d = new BarDataSet(entries, "New DataSet " + cnt)
d.setColors(ColorTemplate.VORDIPLOM_COLORS)
d.setBarShadowColor(Color.rgb(203, 203, 203))
ArrayList<IBarDataSet> sets = new ArrayList<IBarDataSet>()
sets.add(d)
BarData cd = new BarData(sets)
cd.setBarWidth(0.9f)
return cd
}
}
可以看到，这里我们只是实现了一个listview，在适配器里面写上我数据的实现，然后随机20个item就OK了，还是相当的简单的，对吧，这只是一种思路，可以这样理解，为我们下篇做铺垫，我们下篇讲述的是不同的图表，这样才有搞头
![这里写图片描述]()
Sample:下篇提供
