网上找了很多关于插件式开发的资料 最值得研究意义的两种开源开发插件框架 与 另外还有一种非常简单的通过sharedUserId方式去实现。接下来讲的就是最方便的通过sharedUserId去实现。
思路：在主app中与次app中设置同样的sharedUserId，在主app中通过这个id 找到其他次app的包名，通过包名开启其他次app。
需要注意的是 次app中的主activity的action是包名并且category设置成默认的。
demo 下载地址
上代码： 主app通过一个按钮去调用一个次app（插件）。
MainActivity.class
package com.example.plugin;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Intent;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.graphics.Color;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {private Button button1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button1=(Button) findViewById(R.id.button1);button1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubattachPlugin(findPlugins());}});}private List<PluginBean> findPlugins(){List<PluginBean> plugins=new ArrayList<PluginBean>();//遍历包名，来获取插件PackageManager pm=getPackageManager();List<PackageInfo> pkgs=pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);for(PackageInfo pkg:pkgs){//包名String packageName=pkg.packageName;String sharedUserId= pkg.sharedUserId;//sharedUserId是开发时约定好的，这样判断是否为自己人if(!"main.plugin".equals(sharedUserId)||"com.example.plugin".equals(packageName))continue;//进程名String prcessName=pkg.applicationInfo.processName;//label，，也就是appName了String label=pm.getApplicationLabel(pkg.applicationInfo).toString();PluginBean plug=new PluginBean();plug.setLabel(label);plug.setPakageName(packageName);plug.setPrcessName(prcessName);plug.setSharedUserId(sharedUserId);plugins.add(plug);}return plugins;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}private void attachPlugin(List<PluginBean> plugins){Intent intent=new Intent();if(plugins!=null&&plugins.size()>0){intent.setAction(plugins.get(0).getPakageName());Toast.makeText(this, plugins.get(0).getPakageName(), 1).show();startActivity(intent);}else{Toast.makeText(this, "没有找到插件", 1).show();}}}
存放插件的数据 pluginbean.class
package com.example.plugin;public class PluginBean {private String pakageName;private String label;private String sharedUserId;public String getSharedUserId() {return sharedUserId;}public void setSharedUserId(String sharedUserId) {this.sharedUserId = sharedUserId;}public String getPrcessName() {return prcessName;}public void setPrcessName(String prcessName) {this.prcessName = prcessName;}private String prcessName;public String getPakageName() {return pakageName;}public void setPakageName(String pakageName) {this.pakageName = pakageName;}public String getLabel() {return label;}public void setLabel(String label) {this.label = label;}}
主app在清单文件中设置sharedUserId
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android=""package="com.example.plugin"android:sharedUserId="main.plugin"android:versionCode="1"android:versionName="1.0" ><uses-sdkandroid:minSdkVersion="8"android:targetSdkVersion="19" /><applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name="com.example.plugin.MainActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>次app写了一个加载gridview的activity
MainActivity.calss
来说是非者，便是是非人。
