MarkerView
MPAndroidChart 系列:
MPAndroidChart之LineChart(2)MarkerView
MPAndroidChart之LinChart(3)scale縮放
對於MPAndroidChart的基本屬性和一些常見的設置前面的一篇博客MPAndroidChart之LineChart(1)大部分說到了,這篇將要實現MarkerView這個東西,我理解是提示覆蓋物,類似百度地圖的覆蓋物同一個意思,至於其他啥啥的,可以評論裏吐口水。
下面是官方demo裏LineChart圖表,那個99提示就是MarkerView
而我要實現自己的makerview,如下gif圖的左邊、右邊、底部隨着左右滑動顯示的提示:
我們先實現官方那種makerview,這個很簡單,這個其他博客也挺多都說了,我這裏還是說一下
1、首先定義好你要顯示的markerview的樣子是什麼樣的xml,比如
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tvContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="7dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:text=""
android:textSize="12dp"
android:textColor="@android:color/white"
android:ellipsize="end"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
想定義什麼樣的markview就在上面的xml裏面定義就好了
2、接下來是繼承markerview然後重寫refreshContent方法和getOffset方法
package com.mpandroidchartcsdn.mychart;
import android.content.Context;
import android.widget.TextView;
import com.github.mikephil.charting.components.MarkerView;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.utils.MPPointF;
import com.github.mikephil.charting.utils.Utils;
import com.mpandroidchartcsdn.R;
public class MyMarkerView extends MarkerView {
private TextView tvContent;
public MyMarkerView(Context context) {
super(context, R.layout.custom_marker_view);
tvContent = (TextView) findViewById(R.id.tvContent);
}
// callbacks everytime the MarkerView is redrawn, can be used to update the
// content (user-interface) 每次 MarkerView 重繪此方法都會被調用,併爲您提供更新它顯示的內容的機會
@Override
public void refreshContent(Entry e, Highlight highlight) {
//這裏就設置你想顯示到makerview上的數據,Entry可以得到X、Y軸座標,也可以e.getData()獲取其他你設置的數據
tvContent.setText("" + Utils.formatNumber(e.getY(), 0, true));
super.refreshContent(e, highlight);
}
/*
* offset 是以點到的那個點作為 (0,0) 中心然後往右下角畫出來 該方法是讓markerview現實到座標的上方
* 所以如果要顯示在點的上方
* X=寬度的一半,負數
* Y=高度的負數
*/
@Override
public MPPointF getOffset() {
// Log.e("ddd", "width:" + (-(getWidth() / 2)) + "height:" + (-getHeight()));
return new MPPointF(-(getWidth() / 2), -getHeight());
}
}
3、在使用你自己定義的MyMarkerView
MyMarkerView myMarkerView = new MyMarkerView(this);
myMarkerView.setChartView(mLineChart);
mLineChart.setMarker(myMarkerView);
OK,官方demo有,其他博客也很多如何定義MarkerView,這裏就不細說了。
接下來說上圖gif裏的左右和底部makerview的實現,繫好安全帶,拖拉機要啓動了....
上圖gif裏的實現是參考這篇博客“股票走勢圖”系列來實現的,但是這位兄弟博客的股票走勢圖系列使用的MPAndroidChart版本很老了,6月份寫的,現在我使用的最新版本3.0.2好多舊的api也不知道換成什麼了,而且也只是貼了下代碼。廢話結束,下面開始gif裏的markview的實現。
我們前面已經實現官方那種普通的markerview,它是顯示在LineChart裏面的,而我們下面要實現的是在軸的旁邊,比如:“我想實現左邊Y軸上顯示markerview,如gif的左邊一樣”,那我們肯定要找畫markerview的源碼了,Ok
順着我們繼承的MarKerView裏的方法refreshContent找到Chart類裏的drawMarkers方法,恩,一看方法名大概就是它了,我們來看看它裏面有些什麼
/**
* draws all MarkerViews on the highlighted positions
*/
protected void drawMarkers(Canvas canvas) {
// if there is no marker view or drawing marker is disabled
if (mMarker == null || !isDrawMarkersEnabled() || !valuesToHighlight())
return;
for (int i = 0; i < mIndicesToHighlight.length; i++) {
Highlight highlight = mIndicesToHighlight[i];
IDataSet set = mData.getDataSetByIndex(highlight.getDataSetIndex());
Entry e = mData.getEntryForHighlight(mIndicesToHighlight[i]);
int entryIndex = set.getEntryIndex(e);
// make sure entry not null
if (e == null || entryIndex > set.getEntryCount() * mAnimator.getPhaseX())
continue;
float[] pos = getMarkerPosition(highlight);
// check bounds
if (!mViewPortHandler.isInBounds(pos[0], pos[1]))
continue;
// callbacks to update the content
mMarker.refreshContent(e, highlight);
// draw the marker
mMarker.draw(canvas, pos[0], pos[1]);
}
}
如果MPAndroidChart基本的設置熟悉的話,應該看得懂得,不懂就把每個不知道的打印出來,多試幾次就懂了,這裏我們一眼看過去最引人注意的就是mMarker.refreshContent(e,highlight)和mMarker.draw(canvas,pos[0],pos[1])了,恩,沒錯,refreshContent(e,highlight)就是回調更新要顯示的內容,這個暫時不管它,那只剩下mMarker.draw(canvas,pos[0],pos[1])了,馬丹,就是你了,找了那麼久,之前我說不懂參數是什麼就打印多試試就明白了的。
canvas:畫筆,pos[0]:x軸座標,pos[1]:y軸座標,
上面有X軸和Y軸座標,那我想實現gif座標那樣的markerview,是不是把X軸設置0就可以了呢?OK,接下來我們試試把X軸換成0看看Y軸左邊顯示markerview的樣子。
左邊顯示markerview步驟:
1、MarkerView xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tvContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#a0a0a0"
android:paddingLeft="1dp"
android:paddingRight="1dp"
android:text=""
android:textColor="@android:color/white"
android:textSize="12sp" />
</RelativeLayout>
2、繼承MarkerView的類,和實現官方的那種markerview 一模一樣,什麼都沒有變
package com.mpandroidchartcsdn.mychart;
import android.content.Context;
import android.widget.TextView;
import com.github.mikephil.charting.components.MarkerView;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.utils.MPPointF;
import com.github.mikephil.charting.utils.Utils;
import com.mpandroidchartcsdn.R;
public class LeftMarkerView extends MarkerView {
private TextView tvContent;
public LeftMarkerView(Context context) {
super(context, R.layout.custom_marker_view);
tvContent = (TextView) findViewById(R.id.tvContent);
}
// callbacks everytime the MarkerView is redrawn, can be used to update the
// content (user-interface) 每次 MarkerView 重繪此方法都會被調用,併爲您提供更新它顯示的內容的機會
@Override
public void refreshContent(Entry e, Highlight highlight) {
//這裏就設置你想顯示到makerview上的數據,Entry可以得到X、Y軸座標,也可以e.getData()獲取其他你設置的數據
tvContent.setText("" + Utils.formatNumber(e.getY(), 0, true));
super.refreshContent(e, highlight);
}
}
3、這種需求我們最好不要去改源碼,畢竟不是bug之類或者沒辦法什麼的,so,重寫drawMarkers方法就好了
package com.mpandroidchartcsdn.mychart;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.interfaces.datasets.IDataSet;
/**
* Created by tujingwu on 2017/5/4
* .
*/
public class MyLineChart2 extends LineChart {
private LeftMarkerView myMarkerViewLeft;
public MyLineChart2(Context context) {
super(context);
}
public MyLineChart2(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setMyMarkerView(LeftMarkerView leftMarkerView) {
this.myMarkerViewLeft = leftMarkerView;
}
@Override
protected void drawMarkers(Canvas canvas) {
// if there is no marker view or drawing marker is disabled 這裏記得把mMarker 改成自己的myMarkerViewLeft
if (myMarkerViewLeft == null || !isDrawMarkersEnabled() || !valuesToHighlight())
return;
for (int i = 0; i < mIndicesToHighlight.length; i++) {
Highlight highlight = mIndicesToHighlight[i];
IDataSet set = mData.getDataSetByIndex(highlight.getDataSetIndex());
Entry e = mData.getEntryForHighlight(mIndicesToHighlight[i]);
int entryIndex = set.getEntryIndex(e);
// make sure entry not null
if (e == null || entryIndex > set.getEntryCount() * mAnimator.getPhaseX())
continue;
float[] pos = getMarkerPosition(highlight);
// check bounds
if (!mViewPortHandler.isInBounds(pos[0], pos[1]))
continue;
// callbacks to update the content
myMarkerViewLeft.refreshContent(e, highlight);
// draw the marker 這裏我們把X軸原來的pos[0]改成0
myMarkerViewLeft.draw(canvas, 0, pos[1]); //pos[]裏面裝的要draw的x:pos[0] draw的y:pos[1]
}
}
}
好的,我們把源碼裏drawMarkers裏的代碼拷過來,並且把mMarker == null換成myMarkerViewLeft,mMarker.draw(canvas,pos[0],pos[1])換成mMarker.draw(canvas,0,pos[1])。什麼事情都沒做,接下來看看效果
可能有人注意到markerview顯示的數據和Y軸對不上,這個我們沒有設置當然對不上,但是在Y軸左邊顯示Markerview我們已經實現了不是嗎,
不過有個問題:
4、修改
問個問題:
1、我們給X軸換成0了,雖然總體上沒什麼錯,但是作爲畫上去東西是不是很奇怪?(如果自定義view熟練點的就大概知道把0換成什麼的思路的)
就上面的問題可以這樣來解決,畢竟MPAndroidChart也給了挺多東西的,我們把上面的MyLineChart2裏的X/Y軸座標換一下,其他代碼還是沒變:
package com.mpandroidchartcsdn.mychart;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.interfaces.datasets.IDataSet;
/**
* Created by tujingwu on 2017/5/4
* .
*/
public class MyLineChart2 extends LineChart {
private LeftMarkerView myMarkerViewLeft;
public MyLineChart2(Context context) {
super(context);
}
public MyLineChart2(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setMyMarkerView(LeftMarkerView leftMarkerView) {
this.myMarkerViewLeft = leftMarkerView;
}
@Override
protected void drawMarkers(Canvas canvas) {
// if there is no marker view or drawing marker is disabled 這裏記得把mMarker 改成自己的myMarkerViewLeft
if (myMarkerViewLeft == null || !isDrawMarkersEnabled() || !valuesToHighlight())
return;
for (int i = 0; i < mIndicesToHighlight.length; i++) {
Highlight highlight = mIndicesToHighlight[i];
IDataSet set = mData.getDataSetByIndex(highlight.getDataSetIndex());
Entry e = mData.getEntryForHighlight(mIndicesToHighlight[i]);
int entryIndex = set.getEntryIndex(e);
// make sure entry not null
if (e == null || entryIndex > set.getEntryCount() * mAnimator.getPhaseX())
continue;
float[] pos = getMarkerPosition(highlight);
// check bounds
if (!mViewPortHandler.isInBounds(pos[0], pos[1]))
continue;
// callbacks to update the content
myMarkerViewLeft.refreshContent(e, highlight);
// draw the marker 這裏我們把X軸原來我們設置0的換成mViewPortHandler.contentLeft() - myMarkerViewLeft.getWidth()
//對於mViewPortHandler 官網wiki裏:https://github.com/PhilJay/MPAndroidChart/wiki/The-ViewPortHandler有說明的
myMarkerViewLeft.draw(canvas, mViewPortHandler.contentLeft() - myMarkerViewLeft.getWidth(),
pos[1] - myMarkerViewLeft.getHeight() / 2); //pos[]裏面裝的要draw的x:pos[0] draw的y:pos[1]
}
}
}
OK,我們來看看修改後的效果圖
OK,雖然和上面的一張gif一樣,但是我們成功把原來draw(canvas,pos[0],pos[1])換成了我們想要的,不是嗎
Y軸左邊的markerview實現了,那Y軸右邊和X軸底部的MarkerView或X軸頂部的MakerView也不在話下了,下面給出Y軸左右,X軸底部實現MarkerView的
代碼
package com.mpandroidchartcsdn.mychart;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.interfaces.datasets.IDataSet;
/**
* Created by tujingwu on 2017/5/4
* .
*/
public class MyLineChart2 extends LineChart {
private MyMarkerView myMarkerViewLeft;
private BottomMarkerView myMarkerViewRight;
private BottomMarkerView mMyBottomMarkerView;
public MyLineChart2(Context context) {
super(context);
}
public MyLineChart2(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setMyMarkerView(LeftMarkerView leftMarkerView, RightMarkerView rightMarkerView, BottomMarkerView bottomMarkerView) {
this.myMarkerViewLeft = leftMarkerView;
this.myMarkerViewRight = rightMarkerView;
this.mMyBottomMarkerView = bottomMarkerView;
}
@Override
protected void drawMarkers(Canvas canvas) {
// if there is no marker view or drawing marker is disabled 這裏記得把mMarker 改成自己的myMarkerViewLeft
if ( myMarkerViewLeft == null || myMarkerViewRight == null || mMyBottomMarkerView == null || !isDrawMarkersEnabled() || !valuesToHighlight())
return;
for (int i = 0; i < mIndicesToHighlight.length; i++) {
Highlight highlight = mIndicesToHighlight[i];
IDataSet set = mData.getDataSetByIndex(highlight.getDataSetIndex());
Entry e = mData.getEntryForHighlight(mIndicesToHighlight[i]);
int entryIndex = set.getEntryIndex(e);
// make sure entry not null
if (e == null || entryIndex > set.getEntryCount() * mAnimator.getPhaseX())
continue;
float[] pos = getMarkerPosition(highlight);
// check bounds
if (!mViewPortHandler.isInBounds(pos[0], pos[1]))
continue;
/**
* mIndicesToHighlight[i]裏面裝的是某條線的數據
*如果想和該軸的數據對得上 可以自己添加個方法,像myMarkerViewLeft.setData(mIndicesToHighlight[i].getY());
* 然後在自己定義的markerview裏接收就好
*/
// callbacks to update the content
myMarkerViewLeft.refreshContent(e, highlight);
myMarkerViewRight.refreshContent(e, highlight);
mMyBottomMarkerView.refreshContent(e, highlight);
// draw the marker 這裏我們把X軸原來我們設置0的換成mViewPortHandler.contentLeft() - myMarkerViewLeft.getWidth()
//對於mViewPortHandler 官網wiki裏:https://github.com/PhilJay/MPAndroidChart/wiki/The-ViewPortHandler有說明的
myMarkerViewLeft.draw(canvas, mViewPortHandler.contentLeft() - myMarkerViewLeft.getWidth(),
pos[1] - myMarkerViewLeft.getHeight() / 2);
myMarkerViewRight.draw(canvas, mViewPortHandler.contentRight(), pos[1] - myMarkerViewRight.getHeight() / 2);
mMyBottomMarkerView.draw(canvas, pos[0] - mMyBottomMarkerView.getWidth() / 2, mViewPortHandler.contentBottom());
}
}
}
然後使用MyLineChart設置Markerview
LeftMarkerView leftMarkerView = new LeftMarkerView(this);
RightMarkerView rightMarkerView = new RightMarkerView(this);
BottomMarkerView bottomMarkerView = new BottomMarkerView(this);
mLineChart.setMyMarkerView(leftMarkerView, rightMarkerView, bottomMarkerView);
最終效果
OK,現在想怎麼顯示自己的MarkerView都行了。