一、安卓交互功能封装

具体工程创建、模块创建、Java类创建及其他处理此处不在细说，详见：安卓WebView的使用

本文档只是针对指定包名来获取某个应用的图标、名称，并打开此应用。

1、方法调用类

具体代码如下：

import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.Log;

import java.io.ByteArrayOutputStream;

public class GetApplicationListUtils {
    private Context mContext;
    private static GetApplicationListUtils mGetApplicationListUtils = null;

    public GetApplicationListUtils(Context context) {
        this.mContext = context;
    }


    public static GetApplicationListUtils getInstance(Context context){
        if (mGetApplicationListUtils == null) {
            mGetApplicationListUtils = new GetApplicationListUtils(context);
        }
        return mGetApplicationListUtils;
    }

    //通过包名获取应用图标
    public byte[] getDrawableIconByPackageName(String packageName) {
        Drawable icon = getAppIcon(packageName);
        Bitmap bitmap = drawableToBitmap(icon);
        return bitmapToByte(bitmap);
    }

    //获取应用图标
    private Drawable getAppIcon(String packageName) {
        try {
            PackageManager pm = mContext.getPackageManager();
            ApplicationInfo info = pm.getApplicationInfo(packageName, 0);
            Log.i("GetApplicationListUtils","getAppIcon");
            return info.loadIcon(pm);
        } catch (Exception e) {
            e.printStackTrace();
            Log.i("GetApplicationListUtils","Exception");
            return null;
        }
    }

    //Drawable转Bitmap
    private Bitmap drawableToBitmap(Drawable drawable){
        //取drawable的长宽
        int width = drawable.getIntrinsicWidth();
        int height = drawable.getIntrinsicHeight();
        //取drawable的颜色格式
        Bitmap.Config config = Bitmap.Config.ARGB_8888;
        //创建对应Bitmap
        Bitmap bitmap = Bitmap.createBitmap(width,height,config);
        //建立对应Bitmap的画布
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0,0,width,height);
        //把drawable内容画到画布中
        drawable.draw(canvas);
        Log.i("GetApplicationListUtils","drawableToBitmap");
        return bitmap;
    }

    //Bitmap转Byte
    private byte[] bitmapToByte(Bitmap bitmap){
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
        Log.i("GetApplicationListUtils","bitmapToByte");
        return stream.toByteArray();
    }

    //通过包名获取应用名称
    public String getApplicationNameByPackageName(String packageName) {
        String name;
        PackageManager pm = mContext.getPackageManager();
        try {
            name = pm.getApplicationLabel(pm.getApplicationInfo(packageName, PackageManager.GET_META_DATA)).toString();
        } catch (android.content.pm.PackageManager.NameNotFoundException e) {
            name = "";
        }
        return name;
    }

    //通过包名打开应用
    public void StartApp(String packageName) {
        try {
            Intent intent = mContext.getPackageManager().getLaunchIntentForPackage(packageName);
            mContext.startActivity(intent);
        } catch (Exception exception) {}
    }
}

2、注意事项

（1）Drawable转Bitmap

获取应用图标后，会得到Drawable格式数据，需要将其转化为Bitmap，之后再次转化为Byte数组，以便后续Unity调用。

1）Bitmap获取

安卓10.0，即API Level 29以下版本，可以直接使用((BitmapDrawable)drawable).getBitmap()获取Bitmap；

安卓API Level 29（包括29）以上版本，((BitmapDrawable)drawable).getBitmap()失效，需要通过Bitmap.createBitmap(width,height,config)方式来获取Bitmap。

2）Bitmap.Config选择

详见：Bitmap.Config

为了保证有透明通道图标的正常显示，可以选用Bitmap.Config.ARGB_8888。

3）画布设置

画布需要设置，不然图标显示位置有问题。即以下代码不可缺少。

//建立对应Bitmap的画布
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0,0,width,height);
//把drawable内容画到画布中
drawable.draw(canvas);

二、Unity调用

1、AAR包放置

直接将AAR包拖放至Unity的Assets-->Plugins-->Android路径下。

2、创建C#脚本，调用AAR包

写入以下内容，用来调用AAR包里的函数接口。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class LauncherManager : MonoBehaviour
{
    public RawImage appIcon;
    public Text appNameText;

    private AndroidJavaObject getApplicationListUtils;

    private void Awake()
    {
        AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        AndroidJavaObject currentActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
        AndroidJavaClass getApplicationListUtilsClass = new AndroidJavaClass("包名.GetApplicationListUtils");
        getApplicationListUtils = getApplicationListUtilsClass.CallStatic<AndroidJavaObject>("getInstance", currentActivity);
    }

    // Start is called before the first frame update
    void Start()
    {
        //获取应用图标数据
        byte[] drawableBytes = getApplicationListUtils.Call<byte[]>("getDrawableIconByPackageName", "指定应用包名");

        //新建一个Texture2D来加载获得的图像byte[]数据
        Texture2D texture2D = new Texture2D(100, 100);
        texture2D.LoadImage(drawableBytes);

        //在界面上显示获得的应用图标
        appIcon.texture = texture2D;

        //在界面上显示获得的应用名称
        appNameText.text = getApplicationListUtils.Call<string>("getApplicationNameByPackageName", "指定应用包名");
    }

    //打开应用
    public void OpenApplication()
    {
        getApplicationListUtils.Call("StartApp", "指定应用包名");
    }
}

3、调用测试

在Unity编辑器里创建一个RawImage和Text，前者用来展示应用图标，后者用来展示应用名称。并给RawImage添加Button组件来调用打开应用方法。

安卓通过包名获取应用信息并打开应用