占位式插件化框架—Activity通信
占位式插件化框架—Service通信
占位式插件化框架—動態(tài)廣播的使用
我們要實現(xiàn)插件里面的靜態(tài)廣播布讹，那么我們就要在宿主中獲取插件中AndroidManifest.xml里面配置的靜態(tài)接收者。
靜態(tài)注冊的廣播蔓倍，是什么時候注冊的衡怀？
手機開機的時候够庙，所有的app,在進(jìn)行安裝一遍靠娱，系統(tǒng)會去解析AndroidManifest,解析靜態(tài)廣播后，就會去注冊敛纲。
系統(tǒng)是如何去解析apk文件里面的組件信息的?
我們看一下pms如何處理data/app目錄喂击，解析apk的
scanDirTracedLI 是要去掃描 /data/app/目錄下的apk文件 解析AndroidManifest里面的所有信息
一步步的跟下去，會調(diào)用PackageParser.parsePackage()獲取一個Package對象
parsePackage是解析 apk 文件里面的所有信息
Package是apk里面的AndroidManifest配置信息 （所有的）
這樣拿到了Package淤翔，就能拿到靜態(tài)的廣播信息
在宿主中注冊廣播context.registerReceiver(broadcastReceiver, intentFilter)翰绊，那么我們就需要IntentFilter和廣播接收者的名字，我們解析了p.apk旁壮，拿到Package對象监嗜，怎么獲取它們呢？
看到Activity繼承Component抡谐，在跟進(jìn)去看IntentInfo extends IntentFilter 裁奇，那ArrayList<II> intents就是我們要找的IntentFilter。
我們看到在Activity類中有ActivityInfo info屬性麦撵，ActivityInfo extends ComponentInfo刽肠，ComponentInfo extends PackageItemInfo，在PackageItemInfo中有String name屬性免胃，這個就是組件的名字音五。
在PackageParser類中找到，通過這個方法ActivityInfo generateActivityInfo(Activity a, int flags,
PackageUserState state, int userId)就可以獲取ActivityInfo羔沙，從而獲取控件的名字放仗。
public class StaticReceiver extends BroadcastReceiver {
private final String SACTION_1 = "plugin.static_receiver_1";
private final String SACTION_2 = "plugin.static_receiver_2";
private final String SACTION_3 = "plugin.static_receiver_3";
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "我是靜態(tài)廣播StaticReceiver撬碟，我接收到了廣播", Toast.LENGTH_LONG).show();
if (intent.getAction().equals(SACTION_1)) {
Log.e("migill", "我是靜態(tài)廣播StaticReceiver诞挨，我接收到了廣播 action:" + SACTION_1);
}
if (intent.getAction().equals(SACTION_2)) {
Log.e("migill", "我是靜態(tài)廣播StaticReceiver，我接收到了廣播 action:" + SACTION_2);
}
if (intent.getAction().equals(SACTION_3)) {
Log.e("migill", "我是靜態(tài)廣播StaticReceiver呢蛤，我接收到了廣播 action:" + SACTION_3);
}
}
}
配置AndroidManifest.xml
<receiver android:name=".StaticReceiver">
<intent-filter>
<action android:name="plugin.static_receiver_1" />
<action android:name="plugin.static_receiver_2" />
</intent-filter>
<intent-filter>
<action android:name="plugin.static_receiver_3" />
</intent-filter>
</receiver>
在PluginActivity中增加三個發(fā)送廣播的按鈕
public class PluginActivity extends BaseActivity {
private final String ACTION = "com.migill.plugin_package.ACTION";
private final String SACTION_1 = "plugin.static_receiver_1";
private final String SACTION_2 = "plugin.static_receiver_2";
private final String SACTION_3 = "plugin.static_receiver_3";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_plugin);//執(zhí)行的是BaseActivity中的setContentView方法
Log.e("migill", "我是插件PluginActivity");
findViewById(R.id.bt_send_sreceiver1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(SACTION_1);
sendBroadcast(intent);
}
});
findViewById(R.id.bt_send_sreceiver2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(SACTION_2);
sendBroadcast(intent);
}
});
findViewById(R.id.bt_send_sreceiver3).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(SACTION_3);
sendBroadcast(intent);
}
});
}
}
編譯apk,重命名為p.apk,并放入 /storage/emulated/0/Android/data/com.migill.pluginproject/files/這個目錄下惶傻。
在PluginManager類中加入parserApkAction()方法其障，獲取p.apk中AndroidManifest.xml靜態(tài)注冊的廣播的類名和intent-filter银室。
public class PluginManager {
......
public void parserApkAction() {
try {
//插件包路徑
File file = new File(context.getExternalFilesDir(null).getAbsolutePath() + File.separator + "p.apk");
if (!file.exists()) {
Log.e("migill", "插件包 不存在...");
return;
}
String pluginPath = file.getAbsolutePath();
Log.e("migill", "pluginPath : " + pluginPath);
//實例化 PackageParser對象
Class mPackageParserClass = Class.forName("android.content.pm.PackageParser");
Object mPackageParser = mPackageParserClass.newInstance();
// 1.執(zhí)行此方法 public Package parsePackage(File packageFile, int flags)，就是為了励翼，拿到Package
Method mPackageParserMethod = mPackageParserClass.getMethod("parsePackage", File.class, int.class);
Object mPackage = mPackageParserMethod.invoke(mPackageParser, file, PackageManager.GET_ACTIVITIES);
//獲取mPackage中的ArrayList<Activity> receivers屬性
Field receiversField = mPackage.getClass().getDeclaredField("receivers");
Object receivers = receiversField.get(mPackage);
ArrayList arrayList = (ArrayList) receivers;
//此Activity不是組件的Activity,是PackageParser里面的內(nèi)部類
for (Object mActivity : arrayList) {// mActivity --> <receiver android:name=".StaticReceiver">
//通過反射拿到intents ArrayList<II> intents; 一個<receiver>標(biāo)簽可以對應(yīng)多個Intent-Filter
Class mComponentClass = Class.forName("android.content.pm.PackageParser$Component");
Field intentsField = mComponentClass.getDeclaredField("intents");
ArrayList<IntentFilter> intents = (ArrayList) intentsField.get(mActivity);
//上面是拿到了IntentFilter蜈敢，下面就是獲取組件的名字 activityInfo.name
/**
* 執(zhí)行此方法，就能拿到 ActivityInfo
* public static final ActivityInfo generateActivityInfo(Activity a, int flags,
* PackageUserState state, int userId)
*/
Class mPackageUserState = Class.forName("android.content.pm.PackageUserState");
Class mUserHandle = Class.forName("android.os.UserHandle");
int userId = (int) mUserHandle.getMethod("getCallingUserId").invoke(null);
Method generateActivityInfoMethod = mPackageParserClass.getDeclaredMethod("generateActivityInfo",
mActivity.getClass(), int.class, mPackageUserState, int.class);
generateActivityInfoMethod.setAccessible(true);
ActivityInfo mActivityInfo = (ActivityInfo) generateActivityInfoMethod.invoke(null, mActivity, 0, mPackageUserState.newInstance(), userId);
String receiverClassName = mActivityInfo.name;
Log.e("migill", "receiverClassName : " + receiverClassName);
Class mStaticReceiverClass = getClassLoader().loadClass(receiverClassName);
BroadcastReceiver broadcastReceiver = (BroadcastReceiver) mStaticReceiverClass.newInstance();
for (IntentFilter intentFilter : intents) {
Log.e("migill","intentFilter mActions size " + intentFilter.countActions());
context.registerReceiver(broadcastReceiver, intentFilter);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
.....
//注冊 插件里面 配置的 靜態(tài)廣播接收者
public void loadStaticReceiver(View view) {
PluginManager.getInstance(this).parserApkAction();
}
//發(fā)送廣播
public void sendStaticReceiver(View view) {
Intent intent = new Intent();
intent.setAction("plugin.static_receiver_1");
sendBroadcast(intent);
}
}
