android 学习笔记3--静默安装功能的实现

静默安装的实现比较简单，但是有个前提：

你的应用必须有system权限。

所以分为两步：

1. 如何获取system权限。

①. 修改androidmanifest.xml , android:sharedUserId="android.uid.system"

②. 修改android.mk ,增加LOCAL_CERTIFICATE := platform

③. 编译即可，这样你的app就有了system权限。

2. 如何静默安装。

在这里我选择的是用Runtime.getRuntime().exec("pm install -r -s " );的方法。

具体实现如下，可以调用这个方法来安装/system/installapp/下以1.apk 2.apk 命名的apk，并选择是否安装到SD卡。

private int installapk_internel(int apkid, boolean sd) {ByteArrayOutputStream byteary = new ByteArrayOutputStream();ByteArrayOutputStream errbyteary = new ByteArrayOutputStream();InputStream input = null;InputStream errin = null;Process proc = null;int read = -1;int readerr= -1;String errresult= null;String result = null;try {if (sd == true) {proc = Runtime.getRuntime().exec("pm install -r -s " + APK_DIR + Integer.toString(apkid)+ ".apk");} else {proc = Runtime.getRuntime().exec("pm install -r -f " + APK_DIR + Integer.toString(apkid)+ ".apk");}int exitVal = proc.waitFor();// wait for the proc to completeinput = proc.getInputStream();errin = proc.getErrorStream(); while ((readerr = errin.read()) != -1) { errbyteary.write(readerr); }//byteary.write('\n');while ((read = input.read()) != -1) {byteary.write(read);}byte data[] = byteary.toByteArray();byte dataerr[] = errbyteary.toByteArray();result = new String(data);errresult =new String(dataerr);Log.d(TAG, "INSTALL  done ! id= " + apkid + " result code = "+ exitVal);            Log.d(TAG,"INSTALL DONE ,err = "+errresult);} catch (IOException e) {// TODO Auto-generated catch blockLog.d(TAG,"INSTALL  FAILD!");e.printStackTrace();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (input != null) {try {input.close();} catch (IOException e) {e.printStackTrace();}}if (errin != null) {try {errin.close();} catch (IOException e) {e.printStackTrace();}}if (proc != null) {proc.destroy();}Log.d(TAG, " install  complete, result = " + result);}if (result != null&&errresult != null) {return handle_install_result(result,errresult);} else {return -3;}}

这里还增加了对 pm install 的结果的处理

private static final String APK_DIR = "/system/installapp/";private static final int INSTALL_APK_SUCESS = 0;private static final int INSTALL_APK_FAILED_SD_CARD_NOT_PRESENT = -1;private static final int INSTALL_APK_FAILED_INTENER_MEMORY_FULL = -2;private static final int INSTALL_APK_FAILED_OTHER = -3;private static final String INSTALL_RESULT_SUCCESS = "Success";private static final String INSTALL_RESULT_SD_NOT_PRESENT = "Failure [INSTALL_FAILED_MEDIA_UNAVAILABLE]";

private int handle_install_result(String result,String errresult) {if (result.contains(INSTALL_RESULT_SUCCESS)) {return INSTALL_APK_SUCESS;} else if (errresult.contains(INSTALL_RESULT_SD_NOT_PRESENT)) {return INSTALL_APK_FAILED_SD_CARD_NOT_PRESENT;} else {return INSTALL_APK_FAILED_OTHER;}}

这样我们可以在安装到sd失败的情况下尝试安装到内存：

int ret = installapk_internel(current_id, true);if (ret == INSTALL_APK_FAILED_SD_CARD_NOT_PRESENT) {// then we try to install apks to internel memory.Log.d(TAG,"sdcard not present, we try to install apk to internel flash .");ret = installapk_internel(current_id, false);Log.d(TAG,"ret= "+ret);if (ret != INSTALL_APK_SUCESS) {Log.d(TAG, "install faild again.");// WriteInstall_FAILD_FlagtoFile(current_id);}}

总的来说，静默安装还是比较简单的，与大家分享下，共同进步。

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