【移動(dòng)應(yīng)用開發(fā)技術(shù)】Android 優(yōu)秀圖標(biāo)庫MPAndroidChart之柱狀圖（適應(yīng)百分之八十項(xiàng)目需求）

【移動(dòng)應(yīng)用開發(fā)技術(shù)】Android優(yōu)秀圖標(biāo)庫MPAndroidChart之柱狀圖（適應(yīng)百分之八十項(xiàng)目需求）

前言在項(xiàng)目當(dāng)中很多時(shí)候要對數(shù)據(jù)進(jìn)行分析就要用到圖表，在gitHub上有很多優(yōu)秀的圖表開源庫，今天給大家分享的就是MPAndroidChart中的柱狀圖。簡單介紹一下MPAndroidChart：他可以實(shí)現(xiàn)圖表的拖動(dòng)，3D，局部查看，數(shù)據(jù)動(dòng)態(tài)展示等功能。官方源碼地址：/PhilJay/MPA…廢話就不多說了，先給看大家看看效果圖操作步驟第一步：需要將依賴的庫添加到你的項(xiàng)目中implementation'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha'implementation'com.google.android.material:material:1.0.0'implementation'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha'implementation'com.google.android.material:material:1.0.0'第二步：xml中

<com.github.mikephil.charting.charts.BarChart

android:id="@+id/chart1"

android:layout_width="match_parent"

android:layout_height="300dp"

/>第三步：ValueFormatter.java

/**

*

Class

to

format

all

values

before

they

are

drawn

as

labels.

*/

public

abstract

class

ValueFormatter

implements

IAxisValueFormatter,

IValueFormatter

{/**

*

<b>DO

NOT

USE</b>,

only

for

backwards

compatibility

and

will

be

removed

in

future

versions.

*

*

@param

value

the

value

to

be

formatted

*

@param

axis

the

axis

the

value

belongs

to

*

@return

formatted

string

label

*/@Override@Deprecatedpublic

String

getFormattedValue(float

value,

AxisBase

axis)

{

return

getFormattedValue(value);

}/**

*

<b>DO

NOT

USE</b>,

only

for

backwards

compatibility

and

will

be

removed

in

future

versions.

*

@param

value

the

value

to

be

formatted

*

@param

entry

the

entry

the

value

belongs

to

-

in

e.g.

BarChart,

this

is

of

class

BarEntry

*

@param

dataSetIndex

the

index

of

the

DataSet

the

entry

in

focus

belongs

to

*

@param

viewPortHandler

provides

information

about

the

current

chart

state

(scale,

translation,

...)

*

@return

formatted

string

label

*/@Override@Deprecatedpublic

String

getFormattedValue(float

value,

Entry

entry,

int

dataSetIndex,

ViewPortHandler

viewPortHandler)

{

return

getFormattedValue(value);

}/**

*

Called

when

drawing

any

label,

used

to

change

numbers

into

formatted

strings.

*

*

@param

value

float

to

be

formatted

*

@return

formatted

string

label

*/public

String

getFormattedValue(float

value)

{

return

String.valueOf(value);

}/**

*

Used

to

draw

axis

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

value

float

to

be

formatted

*

@param

axis

axis

being

labeled

*

@return

formatted

string

label

*/public

String

getAxisLabel(float

value,

AxisBase

axis)

{

return

getFormattedValue(value);

}/**

*

Used

to

draw

bar

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

barEntry

bar

being

labeled

*

@return

formatted

string

label

*/public

String

getBarLabel(BarEntry

barEntry)

{

return

getFormattedValue(barEntry.getY());

}/**

*

Used

to

draw

stacked

bar

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

value

current

value

to

be

formatted

*

@param

stackedEntry

stacked

entry

being

labeled,

contains

all

Y

values

*

@return

formatted

string

label

*/public

String

getBarStackedLabel(float

value,

BarEntry

stackedEntry)

{

return

getFormattedValue(value);

}/**

*

Used

to

draw

line

and

scatter

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

entry

point

being

labeled,

contains

X

value

*

@return

formatted

string

label

*/public

String

getPointLabel(Entry

entry)

{

return

getFormattedValue(entry.getY());

}/**

*

Used

to

draw

pie

value

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

value

float

to

be

formatted,

may

have

been

converted

to

percentage

*

@param

pieEntry

slice

being

labeled,

contains

original,

non-percentage

Y

value

*

@return

formatted

string

label

*/public

String

getPieLabel(float

value,

PieEntry

pieEntry)

{

return

getFormattedValue(value);

}/**

*

Used

to

draw

radar

value

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

radarEntry

entry

being

labeled

*

@return

formatted

string

label

*/public

String

getRadarLabel(RadarEntry

radarEntry)

{

return

getFormattedValue(radarEntry.getY());

}/**

*

Used

to

draw

bubble

size

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

bubbleEntry

bubble

being

labeled,

also

contains

X

and

Y

values

*

@return

formatted

string

label

*/public

String

getBubbleLabel(BubbleEntry

bubbleEntry)

{

return

getFormattedValue(bubbleEntry.getSize());

}/**

*

Used

to

draw

high

labels,

calls

{@link

#getFormattedValue(float)}

by

default.

*

*

@param

candleEntry

candlestick

being

labeled

*

@return

formatted

string

label

*/public

String

getCandleLabel(CandleEntry

candleEntry)

{

return

getFormattedValue(candleEntry.getHigh());

}

}第四步：MyValueFormatter

public

class

MyValueFormatter

extends

ValueFormatter{private

final

DecimalFormat

mFormat;private

String

suffix;public

MyValueFormatter(String

suffix)

{

mFormat

=

new

DecimalFormat("0000");

this.suffix

=

suffix;

}@Overridepublic

String

getFormattedValue(float

value)

{

return

mFormat.format(value)

+

suffix;

}@Overridepublic

String

getAxisLabel(float

value,

AxisBase

axis)

{

if

(axis

instanceof

XAxis)

{

return

mFormat.format(value);

}

else

if

(value

>

0)

{

return

mFormat.format(value)

+

suffix;

}

else

{

return

mFormat.format(value);

}

}

}

復(fù)制代碼第五步：MainAcyivity

package

detongs.hbqianze.him.linechart;

import

android.os.Bundle;

import

android.util.Log;

import

android.view.WindowManager;

import

android.widget.TextView;

import

androidx.appcompat.app.AppCompatActivity;

import

com.github.mikephil.charting.charts.BarChart;

import

ponents.XAxis;

import

ponents.YAxis;

import

com.github.mikephil.charting.data.BarData;

import

com.github.mikephil.charting.data.BarDataSet;

import

com.github.mikephil.charting.data.BarEntry;

import

erfaces.datasets.IBarDataSet;

import

erfaces.datasets.IDataSet;

import

com.github.mikephil.charting.utils.ColorTemplate;

import

java.util.ArrayList;

import

detongs.hbqianze.him.linechart.chart.MyValueFormatter;

import

detongs.hbqianze.him.linechart.chart.ValueFormatter;

public

class

MainActivity

extends

AppCompatActivity

{private

BarChart

chart;private

TextView

te_cache;@Overrideprotected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.activity_main);

chart

=

findViewById(R.id.chart1);

te_cache

=

findViewById(R.id.te_cache);

chart.getDescription().setEnabled(false);

//設(shè)置最大值條目，超出之后不會(huì)有值

chart.setMaxVisibleValueCount(60);

//分別在x軸和y軸上進(jìn)行縮放

chart.setPinchZoom(true);

//設(shè)置剩余統(tǒng)計(jì)圖的陰影

chart.setDrawBarShadow(false);

//設(shè)置網(wǎng)格布局

chart.setDrawGridBackground(true);

//通過自定義一個(gè)x軸標(biāo)簽來實(shí)現(xiàn)2,015

有分割符符bug

ValueFormatter

custom

=

new

MyValueFormatter("

");

//獲取x軸線

XAxis

xAxis

=

chart.getXAxis();

//設(shè)置x軸的顯示位置

xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);

//設(shè)置網(wǎng)格布局

xAxis.setDrawGridLines(true);

//圖表將避免第一個(gè)和最后一個(gè)標(biāo)簽條目被減掉在圖表或屏幕的邊緣

xAxis.setAvoidFirstLastClipping(false);

//繪制標(biāo)簽

指x軸上的對應(yīng)數(shù)值

默認(rèn)true

xAxis.setDrawLabels(true);

xAxis.setValueFormatter(custom);

//縮放后x

軸數(shù)據(jù)重疊問題

xAxis.setGranularityEnabled(true);

//獲取右邊y標(biāo)簽

YAxis

axisRight

=

chart.getAxisRight();

axisRight.setStartAtZero(true);

//獲取左邊y軸的標(biāo)簽

YAxis

axisLeft

=

chart.getAxisLeft();

//設(shè)置Y軸數(shù)值

從零開始

axisLeft.setStartAtZero(true);

chart.getAxisLeft().setDrawGridLines(false);

//設(shè)置動(dòng)畫時(shí)間

chart.animateXY(600,600);

chart.getLegend().setEnabled(true);

getData();

//設(shè)置柱形統(tǒng)計(jì)圖上的值

chart.getData().setValueTextSize(10);

for

(IDataSet

set

:

chart.getData().getDataSets()){

set.setDrawValues(!set.isDrawValuesEnabled());

}

}public

void

getData(){

ArrayList<BarEntry>

values

=

new

ArrayList<>();

Float

aFloat

=

Float.valueOf("2015");

Log.v("xue","aFloat+++++"+aFloat);

BarEntry

barEntry

=

new

BarEntry(aFloat,Float.valueOf("100"));

BarEntry

barEntry1

=

new

BarEntry(Float.valueOf("2016"),Float.valueOf("210"));

BarEntry

barEntry2

=

new

BarEntry(Float.valueOf("2017"),Float.valueOf("300"));

BarEntry

barEntry3

=

new

BarEntry(Float.valueOf("2018"),Float.valueOf("450"));

BarEntry

barEntry4

=

new

BarEntry(Float.valueOf("2019"),Float.valueOf("300"));

BarEntry

barEntry5

=

new

BarEntry(Float.valueOf("2020"),Float.valueOf("650"));

BarEntry

bar