Android 插件化打开assets中的apk android 插件化开发

转载

mob64ca1411a6fc 2023-08-21 21:23:32

文章标签 android android studio java 插件化 xml 文章分类 Android 移动开发

插件化在Android开发上现在已经使用的很广泛了，各种插件化框架一代又一代的更迭，使我们开发者有了很多的选择。我们开发中经常遇到的有两个问题：一个问题，我们app开发有一个方法数上限，那就是65536；另一个问题，我们发布后的app如果进行功能添加和bug修改，就需要发版，而频繁的发版又会让用户很烦。而插件化就可以解决这两个问题。虽然我们可以用分包和热更新来解决这两个问题，但是插件化的存在，是基于模块化和组件化开发而来的，可以更好的实现我们代码的综合治理，也和契合我们现在的开发模式。

插件化框架很多，尤其是shadow，避开了我们插件化无法避免的使用反射问题，高版本支持更加流畅。不过这里我不说框架，也不说原理，我只是不引入第三方做一个插件化实践。

首先是宿主app

主页代码MainActivity.java

package com.hao.hostandroid;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private Button bt_click;
    protected static final String WRITE_EXTERNAL_STORAGE = Manifest.permission.WRITE_EXTERNAL_STORAGE;//写SD卡权限
    protected static final String READ_EXTERNAL_STORAGE = Manifest.permission.READ_EXTERNAL_STORAGE;//读SD卡权限
    protected static final int WRITE_EXTERNAL_STORAGE_RC = 0x01;//写SD卡权限
    protected static final int READ_EXTERNAL_STORAGE_RC = 0x02;//读SD卡权限
    private boolean isGetPermiss;//是否获取相关权限

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt_click = findViewById(R.id.bt_click);
        bt_click.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isGetPermiss) {
                    Intent intent = new Intent(MainActivity.this, ProxyActivity.class);
                    intent.putExtra(ProxyActivity.EXTRA_DEX_PATH, "/mnt/sdcard/DynamicLoadHost/plugin.apk");
                    startActivity(intent);
                }
            }
        });
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            //6.0以上才需要进行动态权限的请求
            ActivityCompat.requestPermissions(this, new String[]{WRITE_EXTERNAL_STORAGE}, WRITE_EXTERNAL_STORAGE_RC);
        }else{
            //6.0以下不需要获取动态权限
            isGetPermiss = true;
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case WRITE_EXTERNAL_STORAGE_RC:
                //获取到写入权限
                ActivityCompat.requestPermissions(this, new String[]{READ_EXTERNAL_STORAGE}, READ_EXTERNAL_STORAGE_RC);
                break;
            case READ_EXTERNAL_STORAGE_RC:
                //获取到读取权限
                isGetPermiss = true;
                break;
        }
    }
}

主页布局activity_main.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:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="host"
        android:layout_centerInParent="true"/>

    <Button
        android:id="@+id/bt_click"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击跳转"
        android:layout_alignParentBottom="true"/>

</RelativeLayout>

代理Activity ProxyActivity.java

package com.hao.hostandroid;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import dalvik.system.DexClassLoader;

public class ProxyActivity extends AppCompatActivity {
    private static final String TAG = "ProxyActivity";

    public static final String FROM = "extra.from";
    public static final int FROM_EXTERNAL = 0;
    public static final int FROM_INTERNAL = 1;

    public static final String EXTRA_DEX_PATH = "extra.dex.path";
    public static final String EXTRA_CLASS = "extra.class";

    private String mClass;
    private String mDexPath;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mDexPath = getIntent().getStringExtra(EXTRA_DEX_PATH);
        mClass = getIntent().getStringExtra(EXTRA_CLASS);

        Log.d(TAG, "mClass=" + mClass + " mDexPath=" + mDexPath);
        if (mClass == null) {
            launchTargetActivity();
        } else {
            launchTargetActivity(mClass);
        }
    }

    @SuppressLint("NewApi")
    protected void launchTargetActivity() {
        PackageInfo packageInfo = getPackageManager().getPackageArchiveInfo(
                mDexPath, 1);
        if ((packageInfo.activities != null)
                && (packageInfo.activities.length > 0)) {
            String activityName = packageInfo.activities[0].name;
            mClass = activityName;
            launchTargetActivity(mClass);
        }
    }

    @SuppressLint("NewApi")
    protected void launchTargetActivity(final String className) {
        Log.d(TAG, "start launchTargetActivity, className=" + className);
        File dexOutputDir = this.getDir("dex", 0);
        final String dexOutputPath = dexOutputDir.getAbsolutePath();
        ClassLoader localClassLoader = ClassLoader.getSystemClassLoader();
        DexClassLoader dexClassLoader = new DexClassLoader(mDexPath,
                dexOutputPath, null, localClassLoader);
        try {
            Class<?> localClass = dexClassLoader.loadClass(className);
            Constructor<?> localConstructor = localClass
                    .getConstructor(new Class[] {});
            Object instance = localConstructor.newInstance(new Object[] {});
            Log.d(TAG, "instance = " + instance);

            Method setProxy = localClass.getMethod("setProxy",
                    new Class[] { Activity.class });
            setProxy.setAccessible(true);
            setProxy.invoke(instance, new Object[] { this });

            Method onCreate = localClass.getDeclaredMethod("onCreate",
                    new Class[] { Bundle.class });
            onCreate.setAccessible(true);
            Bundle bundle = new Bundle();
            bundle.putInt(FROM, FROM_EXTERNAL);
            onCreate.invoke(instance, new Object[] { bundle });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hao.hostandroid">

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.HostAndroid">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ProxyActivity">
            <intent-filter>
                <action android:name="com.hao.hostandroid.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

这里我们可以看到，首先我们有一个首页，页面上是一个按钮，这个按钮在点击的时候会跳转到插件内部。

在这个类中，我们进行了读写动态权限的申请，并且要求申请权限成功后才可以触发点击事件，即访问插件工作。

接着是一个ProxyActivity，这个类当中使用DexClassLoader类，利用反射机制对插件中的代码进行了调用，模拟出和插件中页面一模一样的页面。

最后是清单文件，清单文件中一块是我们的权限申请，这个不多说。另一块是ProxyActivity的配置

<activity android:name=".ProxyActivity">
    <intent-filter>
        <action android:name="com.hao.hostandroid.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

一定要按照这个进行配置，否则会影响插件中页面的跳转。

接着是插件APP

首先是一个BaseActivity

package com.hao.pluginandroid;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

public class BaseActivity extends Activity {
    private static final String TAG = "Client-BaseActivity";

    public static final String FROM = "extra.from";
    public static final int FROM_EXTERNAL = 0;
    public static final int FROM_INTERNAL = 1;
    public static final String EXTRA_DEX_PATH = "extra.dex.path";
    public static final String EXTRA_CLASS = "extra.class";

    public static final String PROXY_VIEW_ACTION = "com.hao.hostandroid.VIEW";
    public static final String DEX_PATH = "/mnt/sdcard/DynamicLoadHost/plugin.apk";

    protected Activity mProxyActivity;
    protected int mFrom = FROM_INTERNAL;

    public void setProxy(Activity proxyActivity) {
        Log.d(TAG, "setProxy: proxyActivity= " + proxyActivity);
        mProxyActivity = proxyActivity;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        if (savedInstanceState != null) {
            mFrom = savedInstanceState.getInt(FROM, FROM_INTERNAL);
        }
        if (mFrom == FROM_INTERNAL) {
            super.onCreate(savedInstanceState);
            mProxyActivity = this;
        }
        Log.d(TAG, "onCreate: from= " + mFrom);
    }

    protected void startActivityByProxy(String className) {
        if (mProxyActivity == this) {
            Intent intent = new Intent();
            intent.setClassName(this, className);
            this.startActivity(intent);
        } else {
            Intent intent = new Intent(PROXY_VIEW_ACTION);
            intent.putExtra(EXTRA_DEX_PATH, DEX_PATH);
            intent.putExtra(EXTRA_CLASS, className);
            mProxyActivity.startActivity(intent);
        }
    }

    @Override
    public void setContentView(View view) {
        if (mProxyActivity == this) {
            super.setContentView(view);
        } else {
            mProxyActivity.setContentView(view);
        }
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        if (mProxyActivity == this) {
            super.setContentView(view, params);
        } else {
            mProxyActivity.setContentView(view, params);
        }
    }

    @Deprecated
    @Override
    public void setContentView(int layoutResID) {
        if (mProxyActivity == this) {
            super.setContentView(layoutResID);
        } else {
            mProxyActivity.setContentView(layoutResID);
        }
    }

    @Override
    public void addContentView(View view, ViewGroup.LayoutParams params) {
        if (mProxyActivity == this) {
            super.addContentView(view, params);
        } else {
            mProxyActivity.addContentView(view, params);
        }
    }
}

这个类要注意两个地方，一个是

public static final String PROXY_VIEW_ACTION = "com.hao.hostandroid.VIEW";

这个要和我们宿主APP清单文件中配置的一样

<activity android:name=".ProxyActivity">
    <intent-filter>
        <action android:name="com.hao.hostandroid.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

另一个是

public static final String DEX_PATH = "/mnt/sdcard/DynamicLoadHost/plugin.apk";

这个是我们插件放置的位置，宿主APP中首页跳转那里也用到了这个位置

if (isGetPermiss) {
    Intent intent = new Intent(MainActivity.this, ProxyActivity.class);
    intent.putExtra(ProxyActivity.EXTRA_DEX_PATH, "/mnt/sdcard/DynamicLoadHost/plugin.apk");
    startActivity(intent);
}

这里的两个地址一定要一致，我们要注意。

接着我们看插件首页

package com.hao.pluginandroid;

import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends BaseActivity {

    private static final String TAG = "Client-MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView(savedInstanceState);
    }

    private void initView(Bundle savedInstanceState) {
        mProxyActivity.setContentView(generateContentView(mProxyActivity));
    }

    private View generateContentView(final Context context) {
        LinearLayout layout = new LinearLayout(context);
        layout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));
        layout.setBackgroundColor(Color.parseColor("#F79AB5"));
        Button button = new Button(context);
        button.setText("button");
        layout.addView(button, ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "you clicked button",
                        Toast.LENGTH_SHORT).show();
                startActivityByProxy("com.hao.pluginandroid.TestActivity");
            }
        });
        return layout;
    }
}

这个首页有两个地方要注意，首先是它的布局。插件是不能使用资源文件的，所以我们的界面都是用java代码写出来的。图片则需要用下载到sd卡的本地文件，不能使用资源图片。

另一个需要注意的是它的跳转，使用的是对应Activity的全名进行跳转。

最后是我们跳转后的页面

package com.hao.pluginandroid;

import android.graphics.Color;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.Button;

public class TestActivity extends BaseActivity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Button button = new Button(mProxyActivity);
        button.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));
        button.setBackgroundColor(Color.YELLOW);
        button.setText("这是测试页面");
        setContentView(button);
    }
}

这两个Activity都要继承BaseActivity。

经过这两步，我们就实现了一个简单的插件化开发。后续如果有机会我会整一个shadow的学习笔记。

本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。