如何在Android中使用條形圖?
此示例演示如何在Android中使用條形圖。
步驟1 - 在Android Studio中建立一個新專案,轉到檔案⇒新建專案,並填寫所有必需的詳細資訊以建立新專案。
步驟2 - 開啟build.gradle(模組級)並新增庫依賴項。
apply plugin: 'com.android.application' android { packagingOptions { exclude 'META-INF/proguard/androidx-annotations.pro' } packagingOptions { exclude 'META-INF/DEPENDENCIES' exclude 'META-INF/LICENSE' exclude 'META-INF/LICENSE.txt' exclude 'META-INF/license.txt' exclude 'META-INF/NOTICE' exclude 'META-INF/NOTICE.txt' exclude 'META-INF/notice.txt' exclude 'META-INF/ASL2.0' } compileSdkVersion 28 defaultConfig { applicationId "com.example.andy.myapplication" minSdkVersion 15 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support.constraint:constraint-layout:1.1.3' implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' }
步驟3 - 開啟build.gradle(應用程式級)並新增庫依賴項。
// Top-level build file where you can add configuration options common to all sub-projects/modules. buildscript { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.2.1' // NOTE: Do not place your application dependencies here; they belong // in the individual module build.gradle files } } allprojects { repositories { google() jcenter() maven { url 'https://jitpack.io' } } } task clean(type: Delete) { delete rootProject.buildDir }
步驟4 - 將以下程式碼新增到res/layout/activity_main.xml。
<?xml version = "1.0" encoding = "utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity"> <com.github.mikephil.charting.charts.BarChart android:id = "@+id/BarChart" android:layout_width = "fill_parent" android:layout_height = "fill_parent" /> </android.support.constraint.ConstraintLayout>
在上面的程式碼中,我們使用了條形圖檢視來顯示條形圖。
步驟4 - 將以下程式碼新增到src/MainActivity.java
package com.example.andy.myapplication; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import com.github.mikephil.charting.charts.BarChart; 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.utils.ColorTemplate; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { BarChart barChart; BarData barData; BarDataSet barDataSet; ArrayList barEntries; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); barChart = findViewById(R.id.BarChart); getEntries(); barDataSet = new BarDataSet(barEntries, ""); barData = new BarData(barDataSet); barChart.setData(barData); barDataSet.setColors(ColorTemplate.JOYFUL_COLORS); barDataSet.setValueTextColor(Color.BLACK); barDataSet.setValueTextSize(18f); } private void getEntries() { barEntries = new ArrayList<>(); barEntries.add(new BarEntry(2f, 0)); barEntries.add(new BarEntry(4f, 1)); barEntries.add(new BarEntry(6f, 1)); barEntries.add(new BarEntry(8f, 3)); barEntries.add(new BarEntry(7f, 4)); barEntries.add(new BarEntry(3f, 3)); } }
讓我們嘗試執行您的應用程式。我假設您已將您的實際Android移動裝置連線到您的計算機。要從Android Studio執行應用程式,請開啟您專案中的一個活動檔案,然後單擊工具欄中的執行 play.jpg 圖示。選擇您的移動裝置作為選項,然後檢查您的移動裝置,它將顯示您的預設螢幕 -
在上面的結果中,它根據我們的資料集值顯示條形圖。
點選 此處 下載專案程式碼
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