隨著應用的體積越來越大, 插件化也逐漸受到關注,?參考. 應用插件化把模塊完全解耦, 使用下載更新的方式, 擴展應用, 是平臺化類應用的必然選擇. 國內很多公司實現了各式各樣的方法, 360的DroidPlugin是比較有意思的一個, 使用預占位的方式注冊四大組件, 實現熱更新,?參考, 也可以直接讀源碼理解實現邏輯.

Droid Plugin

Talk is cheap, show you the code! 如何把DroidPlugin用起來呢? 這是我比較關注的事情, 開源的Demo寫的如此悲傷, 我來重新梳理一下, 又添加了幾個功能測試. 引入DroidPlugin作為Submodule的依賴.

Github下載地址?和?測試Apk.

使用方法, 生成測試apk, 和其他若干apk, 放入Download文件夾下.
adb命令:?adb push app-debug.apk /sdcard/Download/app-debug.apk
確保Download文件夾下, 有.apk后綴名的文件.

主要
(1) 插件安裝后, 可以直接啟動, 不需要任何冗余操作.
(2) 宿主的權限要多于插件的權限, 否則會權限不足.
(3) 宿主和插件, 可以通過隱式Intent進行通信.

動畫

1. 主頁

使用TabLayout+ViewPager的架構, 包含兩個頁面, 一個是安裝\刪除頁面, 另一個是啟動\卸載頁面. 為了測試和插件的Intent通信, 增加跳轉功能和顯示信息功能.

/*** 主頁面, 使用TabLayout+ViewPager.* 子頁面, 使用RecyclerView.** @author wangchenlong*/ public class MainActivity extends AppCompatActivity {@Bind(R.id.main_tl_tabs) TabLayout mTlTabs; // Tabs@Bind(R.id.main_vp_container) ViewPager mVpContainer; // ViewPager@Bind(R.id.main_b_goto) Button mBGoto; // 跳轉插件的按鈕@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);PagerAdapter adapter = new PagerAdapter(getSupportFragmentManager());mVpContainer.setAdapter(adapter);mTlTabs.setupWithViewPager(mVpContainer);mBGoto.setOnClickListener(this::gotoPlugin);Intent intent = getIntent();if (intent != null && intent.getStringExtra(PluginConsts.MASTER_EXTRA_STRING) != null) {String words = "say: " + intent.getStringExtra(PluginConsts.MASTER_EXTRA_STRING);Toast.makeText(this, words, Toast.LENGTH_SHORT).show();}}// 跳轉控件private void gotoPlugin(View view) {if (isActionAvailable(view.getContext(), PluginConsts.PLUGIN_ACTION_MAIN)) {Intent intent = new Intent(PluginConsts.PLUGIN_ACTION_MAIN);intent.putExtra(PluginConsts.PLUGIN_EXTRA_STRING, "Hello, My Plugin!");startActivity(intent);} else {Toast.makeText(view.getContext(), "跳轉失敗", Toast.LENGTH_SHORT).show();}}// Action是否允許public static boolean isActionAvailable(Context context, String action) {Intent intent = new Intent(action);return context.getPackageManager().resolveActivity(intent, 0) != null;} }

ViewPager適配器

/*** ViewPager的適配器* <p>* Created by wangchenlong on 16/1/8.*/ public class PagerAdapter extends FragmentPagerAdapter {private static final String[] TITLES = {"已安裝","未安裝"};public PagerAdapter(FragmentManager fm) {super(fm);}@Override public Fragment getItem(int position) {if (position == 0) {return new StartFragment(); // 已安裝頁} else {return new StoreFragment(); // 想要安裝頁}}@Override public int getCount() {return TITLES.length;}@Overridepublic CharSequence getPageTitle(int position) {return TITLES[position];} }

2. 加載頁

顯示Download文件夾下的Apk信息. 使用RecyclerView實現apk列表, 復用Adapter, 標志位(ApkOperator.TYPE_STORE)區分頁面. 使用Rx異步掃描Download文件夾, 添加至列表. 接收服務連接狀態, 成功則自動顯示Apk.

/*** 安裝Apk的頁面, 使用RecyclerView.* <p>* Created by wangchenlong on 16/1/8.*/ public class StoreFragment extends Fragment {@Bind(R.id.list_rv_recycler) RecyclerView mRvRecycler;private ApkListAdapter mStoreAdapter; // 適配器// 服務連接private ServiceConnection mServiceConnection = new ServiceConnection() {@Override public void onServiceConnected(ComponentName name, IBinder service) {loadApks();}@Override public void onServiceDisconnected(ComponentName name) {}};@Nullable @Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragment_list, container, false);ButterKnife.bind(this, view);return view;}@Override public void onViewCreated(View view, Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);LinearLayoutManager llm = new LinearLayoutManager(view.getContext());llm.setOrientation(LinearLayoutManager.VERTICAL);mRvRecycler.setLayoutManager(llm);mStoreAdapter = new ApkListAdapter(getActivity(), ApkOperator.TYPE_STORE);mRvRecycler.setAdapter(mStoreAdapter);if (PluginManager.getInstance().isConnected()) {loadApks();} else {PluginManager.getInstance().addServiceConnection(mServiceConnection);}}// 加載Apkprivate void loadApks() {// 異步加載, 防止Apk過多, 影響速度Observable.just(getApkFromDownload()).subscribeOn(Schedulers.newThread()).observeOn(AndroidSchedulers.mainThread()).subscribe(mStoreAdapter::setApkItems);}// 從下載文件夾獲取Apkprivate ArrayList<ApkItem> getApkFromDownload() {File files = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);PackageManager pm = getActivity().getPackageManager();ArrayList<ApkItem> apkItems = new ArrayList<>();for (File file : files.listFiles()) {if (file.exists() && file.getPath().toLowerCase().endsWith(".apk")) {final PackageInfo info = pm.getPackageArchiveInfo(file.getPath(), 0);apkItems.add(new ApkItem(pm, info, file.getPath()));}}return apkItems;}@Overridepublic void onDestroyView() {super.onDestroyView();ButterKnife.unbind(this);PluginManager.getInstance().removeServiceConnection(mServiceConnection);} }

適配器, 負責列表顯示, 操作交由ViewHolder進行處理.

/*** 啟動的適配器* <p>* Created by wangchenlong on 16/1/13.*/ public class ApkListAdapter extends RecyclerView.Adapter<ApkItemViewHolder> {private ArrayList<ApkItem> mApkItems;private Activity mActivity;private int mType; // 類型public ApkListAdapter(Activity activity, int type) {mActivity = activity;mApkItems = new ArrayList<>();mType = type;}public void setApkItems(ArrayList<ApkItem> apkItems) {mApkItems = apkItems;notifyDataSetChanged();}public void addApkItem(ApkItem apkItem) {mApkItems.add(apkItem);notifyItemInserted(mApkItems.size() + 1);}public void removeApkItem(ApkItem apkItem) {mApkItems.remove(apkItem);notifyDataSetChanged();}public ApkItem getApkItem(int index) {return mApkItems.get(index);}public int getCount() {return mApkItems.size();}@Override public ApkItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.apk_item, parent, false);return new ApkItemViewHolder(mActivity, view, mType, this::removeApkItem);}@Override public void onBindViewHolder(ApkItemViewHolder holder, int position) {holder.bindTo(mApkItems.get(position));}@Override public int getItemCount() {return mApkItems.size();} }

注意, 在設置Item時, 需要刷新列表, 使用notifyDataSetChanged或notifyItemInserted.

ViewHolder, 控制列表點擊事件, 根據頁面類型, 修改調用方法.

/*** Apk的列表, 參考: R.layout.apk_item* <p>* Created by wangchenlong on 16/1/13.*/ public class ApkItemViewHolder extends RecyclerView.ViewHolder {@Bind(R.id.apk_item_iv_icon) ImageView mIvIcon; // 圖標@Bind(R.id.apk_item_tv_title) TextView mTvTitle; // 標題@Bind(R.id.apk_item_tv_version) TextView mTvVersion; // 版本號@Bind(R.id.apk_item_b_do) Button mBDo; // 確定按鈕@Bind(R.id.apk_item_b_undo) Button mBUndo; // 取消按鈕private ApkItem mApkItem; // Apk項private Context mContext; // 上下文private ApkOperator mApkOperator; // Apk操作private int mType; // 類型/*** 初始化ViewHolder** @param activity Dialog綁定Activity* @param itemView 項視圖* @param type 類型, 加載或啟動* @param callback 刪除Item的調用*/public ApkItemViewHolder(Activity activity, View itemView, int type, ApkOperator.RemoveCallback callback) {super(itemView);ButterKnife.bind(this, itemView);mContext = activity.getApplicationContext();mApkOperator = new ApkOperator(activity, callback); // Apk操作mType = type; // 類型}// 綁定ViewHolderpublic void bindTo(ApkItem apkItem) {mApkItem = apkItem;mIvIcon.setImageDrawable(apkItem.icon);mTvTitle.setText(apkItem.title);mTvVersion.setText(String.format("%s(%s)", apkItem.versionName, apkItem.versionCode));// 修改文字if (mType == ApkOperator.TYPE_STORE) {mBUndo.setText("刪除");mBDo.setText("安裝");} else if (mType == ApkOperator.TYPE_START) {mBUndo.setText("卸載");mBDo.setText("啟動");}mBUndo.setOnClickListener(this::onClickEvent);mBDo.setOnClickListener(this::onClickEvent);}// 點擊事件private void onClickEvent(View view) {if (mType == ApkOperator.TYPE_STORE) {if (view.equals(mBUndo)) {mApkOperator.deleteApk(mApkItem);} else if (view.equals(mBDo)) {// 安裝Apk較慢需要使用異步線程new InstallApkTask().execute();}} else if (mType == ApkOperator.TYPE_START) {if (view.equals(mBUndo)) {mApkOperator.uninstallApk(mApkItem);} else if (view.equals(mBDo)) {mApkOperator.openApk(mApkItem);}}}// 安裝Apk的線程, Rx無法使用.private class InstallApkTask extends AsyncTask<Void, Void, String> {@Overrideprotected void onPostExecute(String v) {Toast.makeText(mContext, v, Toast.LENGTH_LONG).show();}@Overrideprotected String doInBackground(Void... params) {return mApkOperator.installApk(mApkItem);}} }

注意, 安裝Apk使用異步線程(AsyncTask), 不能使用Rx.

3. 啟動頁

啟動頁面, 顯示已安裝的Apk, 包含啟動和卸載功能. 與安裝頁不同, 額外增加一個接收器, 負責接收安裝成功之后的廣播, 用于更新列表.

/*** 啟動Apk頁面* <p>* Created by wangchenlong on 16/1/13.*/ public class StartFragment extends Fragment {@Bind(R.id.list_rv_recycler) RecyclerView mRvRecycler;private ApkListAdapter mApkListAdapter; // 適配器private InstallApkReceiver mInstallApkReceiver; // Apk安裝接收器// 服務連接private final ServiceConnection mServiceConnection = new ServiceConnection() {@Override public void onServiceConnected(ComponentName name, IBinder service) {loadApks();}@Override public void onServiceDisconnected(ComponentName name) {}};@Nullable @Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragment_list, container, false);ButterKnife.bind(this, view);return view;}@Override public void onViewCreated(View view, Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);LinearLayoutManager llm = new LinearLayoutManager(view.getContext());llm.setOrientation(LinearLayoutManager.VERTICAL);mRvRecycler.setLayoutManager(llm);mApkListAdapter = new ApkListAdapter(getActivity(), ApkOperator.TYPE_START);mRvRecycler.setAdapter(mApkListAdapter);mInstallApkReceiver = new InstallApkReceiver();mInstallApkReceiver.registerReceiver(this.getActivity());if (PluginManager.getInstance().isConnected()) {loadApks();} else {PluginManager.getInstance().addServiceConnection(mServiceConnection);}}@Overridepublic void onDestroyView() {super.onDestroyView();ButterKnife.unbind(this);mInstallApkReceiver.unregisterReceiver(this.getActivity());}// 加載Apkprivate void loadApks() {// 異步加載, 防止Apk過多, 影響速度Observable.just(getApkFromInstall()).subscribeOn(Schedulers.newThread()).observeOn(AndroidSchedulers.mainThread()).subscribe(mApkListAdapter::setApkItems);}// 獲取安裝中獲取Apkprivate ArrayList<ApkItem> getApkFromInstall() {ArrayList<ApkItem> apkItems = new ArrayList<>();try {final List<PackageInfo> infos = PluginManager.getInstance().getInstalledPackages(0);if (infos == null) {return apkItems;}final PackageManager pm = getActivity().getPackageManager();// noinspection allfor (final PackageInfo info : infos) {apkItems.add(new ApkItem(pm, info, info.applicationInfo.publicSourceDir));}} catch (RemoteException e) {e.printStackTrace();}return apkItems;}// 安裝Apk接收器private class InstallApkReceiver extends BroadcastReceiver {// 注冊監聽public void registerReceiver(Context context) {IntentFilter filter = new IntentFilter();filter.addAction(PluginManager.ACTION_PACKAGE_ADDED);filter.addAction(PluginManager.ACTION_PACKAGE_REMOVED);filter.addDataScheme("package");context.registerReceiver(this, filter);}// 關閉監聽public void unregisterReceiver(Context context) {context.unregisterReceiver(this);}@Overridepublic void onReceive(Context context, Intent intent) {// 監聽添加和刪除事件if (PluginManager.ACTION_PACKAGE_ADDED.equals(intent.getAction())) {try {PackageManager pm = getActivity().getPackageManager();String pkg = intent.getData().getAuthority();PackageInfo info = PluginManager.getInstance().getPackageInfo(pkg, 0);mApkListAdapter.addApkItem(new ApkItem(pm, info, info.applicationInfo.publicSourceDir));} catch (Exception e) {e.printStackTrace();}} else if (PluginManager.ACTION_PACKAGE_REMOVED.equals(intent.getAction())) {String pkg = intent.getData().getAuthority();int num = mApkListAdapter.getCount();ApkItem removedItem = null;for (int i = 0; i < num; i++) {ApkItem item = mApkListAdapter.getApkItem(i);if (TextUtils.equals(item.packageInfo.packageName, pkg)) {removedItem = item;break;}}if (removedItem != null) {mApkListAdapter.removeApkItem(removedItem);}}}} }

復用Adapter和ViewHolder, 代碼簡介之道.

4. 方法類

四大方法, 安裝\刪除\啟動\卸載, 在刪除和卸載時, 均會提示Dialog. 注意的是安裝Apk, 耗時較長, 需要使用異步線程.

/*** Apk操作, 包含刪除\安裝\卸載\啟動Apk* <p>* Created by wangchenlong on 16/1/13.*/ public class ApkOperator {public static final int TYPE_STORE = 0; // 存儲Apkpublic static final int TYPE_START = 1; // 啟動Apkprivate Activity mActivity; // 綁定Dialogprivate RemoveCallback mCallback; // 刪除Item的回調public ApkOperator(Activity activity, RemoveCallback callback) {mActivity = activity;mCallback = callback;}// 刪除Apkpublic void deleteApk(final ApkItem item) {AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);builder.setTitle("警告");builder.setMessage("你確定要刪除" + item.title + "么？");builder.setNegativeButton("刪除", (dialog, which) -> {if (new File(item.apkFile).delete()) {mCallback.removeItem(item);Toast.makeText(mActivity, "刪除成功", Toast.LENGTH_SHORT).show();} else {Toast.makeText(mActivity, "刪除失敗", Toast.LENGTH_SHORT).show();}});builder.setNeutralButton("取消", null);builder.show();}/*** 安裝Apk, 耗時較長, 需要使用異步線程** @param item Apk項* @return [0:成功, 1:已安裝, -1:連接失敗, -2:權限不足, -3:安裝失敗]*/public String installApk(final ApkItem item) {if (!PluginManager.getInstance().isConnected()) {return "連接失敗"; // 連接失敗}if (isApkInstall(item)) {return "已安裝"; // 已安裝}try {int result = PluginManager.getInstance().installPackage(item.apkFile, 0);boolean isRequestPermission = (result == PluginManager.INSTALL_FAILED_NO_REQUESTEDPERMISSION);if (isRequestPermission) {return "權限不足";}} catch (RemoteException e) {e.printStackTrace();return "安裝失敗";}return "成功";}// Apk是否安裝private boolean isApkInstall(ApkItem apkItem) {PackageInfo info = null;try {info = PluginManager.getInstance().getPackageInfo(apkItem.packageInfo.packageName, 0);} catch (RemoteException e) {e.printStackTrace();}return info != null;}// 卸載Apkpublic void uninstallApk(final ApkItem item) {AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);builder.setTitle("警告");builder.setMessage("警告，你確定要卸載" + item.title + "么？");builder.setNegativeButton("卸載", (dialog, which) -> {if (!PluginManager.getInstance().isConnected()) {Toast.makeText(mActivity, "服務未連接", Toast.LENGTH_SHORT).show();} else {try {PluginManager.getInstance().deletePackage(item.packageInfo.packageName, 0);mCallback.removeItem(item);Toast.makeText(mActivity, "卸載完成", Toast.LENGTH_SHORT).show();} catch (RemoteException e) {e.printStackTrace();}}});builder.setNeutralButton("取消", null);builder.show();}// 打開Apkpublic void openApk(final ApkItem item) {PackageManager pm = mActivity.getPackageManager();Intent intent = pm.getLaunchIntentForPackage(item.packageInfo.packageName);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);mActivity.startActivity(intent);}// 刪除Item回調, Adapter調用刪除Itempublic interface RemoveCallback {void removeItem(ApkItem apkItem);} }

5. 互動Apk

為了測試DroidPlugin的一些特性, 又寫了一個測試Apk.
測試插件和宿主的通信, 插件類的生命周期.

public class MainActivity extends AppCompatActivity {private static final String TAG = "DEBUG-WCL: " + MainActivity.class.getSimpleName();@Bind(R.id.main_b_goto_master) Button mBGotoMaster;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);Intent intent = getIntent();if (intent != null && intent.getStringExtra(PluginConsts.PLUGIN_EXTRA_STRING) != null) {String words = "say: " + intent.getStringExtra(PluginConsts.PLUGIN_EXTRA_STRING);Toast.makeText(this, words, Toast.LENGTH_SHORT).show();}mBGotoMaster.setOnClickListener(this::gotoMaster);Log.d(TAG, "onCreate"); // 測試生命周期}@Override protected void onDestroy() {super.onDestroy();Log.d(TAG, "onDestroy"); // 測試生命周期}// 跳轉控件private void gotoMaster(View view) {if (isActionAvailable(view.getContext(), PluginConsts.MASTER_ACTION_MAIN)) {Intent intent = new Intent(PluginConsts.MASTER_ACTION_MAIN);intent.putExtra(PluginConsts.MASTER_EXTRA_STRING, "Hello, My Master!");startActivity(intent);} else {Toast.makeText(view.getContext(), "跳轉失敗", Toast.LENGTH_SHORT).show();}}// Action是否允許public static boolean isActionAvailable(Context context, String action) {Intent intent = new Intent(action);return context.getPackageManager().resolveActivity(intent, 0) != null;} }

有時間可以再試試其他公司的插件化. One by One.

OK, that's all! Enjoy It.

原文地址：?http://www.jianshu.com/p/f1217cce93ef

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