Android啓動其他app的Activity

已知App包名及啓動類名

 Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_LAUNCHER); ComponentName cn = new ComponentName("com.zhxumao.plugina", "com.zhxumao.plugina.MainActivity"); intent.setComponent(cn); startActivity(intent);

只知包名啓動App

// 通过包名获取此APP详细信息，包括Activities、services、versioncode、name等等PackageInfo packageInfo = null; try {        packageInfo = getPackageManager().getPackageInfo("com.zhxumao.plugina",0);    } catch (PackageManager.NameNotFoundException e) {        e.printStackTrace();    }    if (packageInfo == null) return;    Intent intent = new Intent(Intent.ACTION_MAIN);    intent.addCategory(Intent.CATEGORY_LAUNCHER);    intent.setPackage(packageInfo.packageName);    //遍歷該Activity的信息    List resolveInfos = getPackageManager().queryIntentActivities(intent,0);    if (resolveInfos != null){        ResolveInfo resolveInfo = resolveInfos.iterator().next();//一般衹有一個        if (resolveInfo == null){            return;        }        ComponentName componentName = new ComponentName(resolveInfo.activityInfo.packageName,resolveInfo.activityInfo.name);        Intent intentActivity = new Intent(Intent.ACTION_MAIN);        intentActivity.addCategory(Intent.CATEGORY_LAUNCHER);        intentActivity.setComponent(componentName);        startActivity(intentActivity);    }

啓動任意已注冊的Activity

被啓動的Activity需要設置intent-filter

<intent-filter>                <action android:name="com.zhxumao.plugina.showActivity"/>                <category android:name="android.intent.category.DEFAULT"/>            intent-filter>

//已知類名簡單調用 Intent intent = new Intent();        ComponentName cn = new ComponentName("com.zhxumao.plugina", "com.zhxumao.plugina.SecondActivity");        intent.setComponent(cn);        startActivity(intent);//不知類名調用，需知道已設置的actionIntent intent = new Intent();        intent.setAction("com.zhxumao.plugina.showActivity");        startActivity(intent);

動態加載已安裝apk的類

//動態加載已安裝apk的類        Intent intent = new Intent(Intent.ACTION_MAIN);        intent.addCategory(Intent.CATEGORY_LAUNCHER);        intent.setPackage("com.zhxumao.plugina");        // 获得包管理器        PackageManager pm = getPackageManager();        List resolveinfoes = pm.queryIntentActivities(intent, 0);        // 获得指定的activity的信息        ActivityInfo actInfo = resolveinfoes.get(0).activityInfo;        // 获得apk的目录或者jar的目录        String apkPath = actInfo.applicationInfo.sourceDir;        // native代码的目录        String libPath = actInfo.applicationInfo.nativeLibraryDir;        // 创建类加载器，把dex加载到虚拟机中        // 第一个参数：是指定apk安装的路径，这个路径要注意只能是通过actInfo.applicationInfo.sourceDir来获取        // 第二个参数：是C/C++依赖的本地库文件目录,可以为null        // 第三个参数：是上一级的类加载器        PathClassLoader pcl = new PathClassLoader(apkPath, libPath,                this.getClassLoader());        // 加载类        try {           Class dynamic = pcl.loadClass("com.zhxumao.plugina.SecondActivity");            Method method = dynamic.getDeclaredMethod("ShowToast");            method.invoke(dynamic.newInstance());        } catch (Exception exception) {            exception.printStackTrace();        }

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