最近在android 4.0.4系统下实现apk的静默安装和启动的功能，这里和大家分享一下，希望能有所帮助。
源码如下：
import java.io.DataOutputStream;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.content.Intent;import android.content.pm.ActivityInfo;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;public class InstallApkUtils { public static void installAndStartApk(final Context context, final String apkPath) { if ((apkPath==null) || (context==null)) { return; } File file = new File(apkPath); if (file.exists() == false) { return; } new Thread() { public void run() { String packageName = getUninstallApkPackageName(context, apkPath); if (silentInstall(apkPath)) { List<ResolveInfo> matches = findActivitiesForPackage(context, packageName); if ((matches!=null) && (matches.size()>0)) { ResolveInfo resolveInfo = matches.get(0); ActivityInfo activityInfo = resolveInfo.activityInfo; startApk(activityInfo.packageName, activityInfo.name); } } }; }.start(); } public static String getUninstallApkPackageName(Context context, String apkPath) { String packageName = null; if (apkPath == null) { return packageName; } PackageManager pm = context.getPackageManager(); PackageInfo info = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES); if (info == null) { return packageName; } packageName = info.packageName; return packageName; } public static List<ResolveInfo> findActivitiesForPackage(Context context, String packageName) { final PackageManager pm = context.getPackageManager(); final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); mainIntent.setPackage(packageName); final List<ResolveInfo> apps = pm.queryIntentActivities(mainIntent, 0); return apps != null ? apps : new ArrayList<ResolveInfo>(); } public static boolean silentInstall(String apkPath) { String cmd1 = "chmod 777 " + apkPath + " \n"; String cmd2 = "LD_LIBRARY_PATH=/vendor/lib:/system/lib pm install -r " + apkPath + " \n"; return execWithSID(cmd1, cmd2); } private static boolean execWithSID(String... args) { boolean isSuccess = false; Process process = null; OutputStream out = null; try { process = Runtime.getRuntime().exec("su"); out = process.getOutputStream(); DataOutputStream dataOutputStream = new DataOutputStream(out); for (String tmp : args) { dataOutputStream.writeBytes(tmp); } dataOutputStream.flush(); // 提交命令 dataOutputStream.close(); // 关闭流操作 out.close(); isSuccess = waitForProcess(process); } catch (IOException e) { e.printStackTrace(); } return isSuccess; } public static boolean startApk(String packageName, String activityName) { boolean isSuccess = false; String cmd = "am start -n " + packageName + "/" + activityName + " \n"; try { Process process = Runtime.getRuntime().exec(cmd); isSuccess = waitForProcess(process); } catch (IOException e) { NLog.i(TAG, e.getMessage()); e.printStackTrace(); } return isSuccess; } private static boolean waitForProcess(Process p) { boolean isSuccess = false; int returnCode; try { returnCode = p.waitFor(); switch (returnCode) { case 0: isSuccess = true; break; case 1: break; default: break; } } catch (InterruptedException e) { e.printStackTrace(); } return isSuccess; }}
如果要使用，还需以下步骤：
1、在AndroidManifest.xml文件里添加如下权限：
<uses-permission android:name="android.permission.INSTALL_PACKAGES" />
2、进行系统签名。命令如下：
java -jar signapk.jar platform.x509.pem platform.pk8 XXX.apk Signed_XXX.apk
好了，现在大功告成！！！