--摘自《android插件化开发指南》
1.android资源文件分为两类&＃xff1a;
第一类是res目录下存放的可编译资源文件&＃xff0c;编译时&＃xff0c;系统会自动在R.java中生成资源文件的十六进制值
Resources resources &＃61; getResources();
String appName &＃61; resources.getString(R.string.app_name);
第二类是assets目录下存放的原始资源文件&＃xff0c;apk在编译时不会编译assets下的资源文件
Resources resources &＃61; getResources();
AssetManager am &＃61; getResources().getAssets();
InputStream is &＃61; getResources().getAssets().open("filename");
2.Resources内部各种方法其实都是间接调用AssetManager的内部方法。AssetManager的addAssetPath方法会在app启动的时候把当前apk的路径传进去&＃xff0c;就能访问apk的所有资源了。在这里可以把插件apk的资源塞进去
3.apk打包时会生成一个resource.arsc文件&＃xff0c;它就是一个Hash表&＃xff0c;存放着每个十六进制值和资源的对应关系
***资源的插件化解决方案***
public class Dynamic implements IDynamic {&＃64;Overridepublic String getStringForResId(Context context) {return context.getResources().getString(R.string.myplugin1_hello_world);}
}
public class BaseActivity extends Activity {private AssetManager mAssetManager;private Resources mResources;private Resources.Theme mTheme;private String dexpath &＃61; null; //apk文件地址private File fileRelease &＃61; null; //释放目录protected DexClassLoader classLoader &＃61; null;private String pluginName &＃61; "plugin1.apk";TextView tv;&＃64;Overrideprotected void attachBaseContext(Context newBase) {super.attachBaseContext(newBase);Utils.extractAssets(newBase, pluginName);}&＃64;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//第三步&＃xff1a;加载外部的插件&＃xff0c;生成插件对应的ClassLoaderFile extractFile &＃61; this.getFileStreamPath(pluginName);dexpath &＃61; extractFile.getPath();fileRelease &＃61; getDir("dex", 0);classLoader &＃61; new DexClassLoader(dexpath, fileRelease.getAbsolutePath(), null, getClassLoader());}/*** 第一步&＃xff1a;通过反射&＃xff0c;创建AssetManager对象&＃xff0c;调用addAssetPath方法&＃xff0c;把插件Plugin的路径添加到这个AssetManager对象中**/protected void loadResources() {try {AssetManager assetManager &＃61; AssetManager.class.newInstance();Method addAssetPath &＃61; assetManager.getClass().getMethod("addAssetPath", String.class);addAssetPath.invoke(assetManager, dexpath);mAssetManager &＃61; assetManager;} catch (Exception e) {e.printStackTrace();}Resources superRes &＃61; super.getResources();superRes.getDisplayMetrics();superRes.getConfiguration();mResources &＃61; new Resources(mAssetManager, superRes.getDisplayMetrics(), superRes.getConfiguration());mTheme &＃61; mResources.newTheme();mTheme.setTo(super.getTheme());}/*** 第二步&＃xff1a;重写Acitivity的getAsset&＃xff0c;getResources和getTheme方法**/&＃64;Overridepublic AssetManager getAssets() {return mAssetManager &＃61;&＃61; null ? super.getAssets() : mAssetManager;}&＃64;Overridepublic Resources getResources() {return mResources &＃61;&＃61; null ? super.getResources() : mResources;}&＃64;Overridepublic Resources.Theme getTheme() {return mTheme &＃61;&＃61; null ? super.getTheme() : mTheme;}
}
public class MainActivity extends BaseActivity {TextView tv;&＃64;SuppressLint("NewApi")&＃64;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button btn_6 &＃61; (Button) findViewById(R.id.btn_6);tv &＃61; (TextView)findViewById(R.id.tv);//带资源文件的调用btn_6.setOnClickListener(new View.OnClickListener() {&＃64;Overridepublic void onClick(View arg0) {loadResources();Class mLoadClassDynamic &＃61; null;try {//第四步&＃xff1a;通过反射&＃xff0c;获取插件中的类&＃xff0c;构造出插件类的对象dynamicObject&＃xff0c;然后就可以让插件中的类读取插件中的资源了mLoadClassDynamic &＃61; classLoader.loadClass("jianqiang.com.plugin1.Dynamic");Object dynamicObject &＃61; mLoadClassDynamic.newInstance();IDynamic dynamic &＃61; (IDynamic) dynamicObject;String content &＃61; dynamic.getStringForResId(MainActivity.this);tv.setText(content);Toast.makeText(getApplicationContext(), content &＃43; "", Toast.LENGTH_LONG).show();} catch (Exception e) {Log.e("DEMO", "msg:" &＃43; e.getMessage());}}});}
}
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