Android中操作App的一些常用方法

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1.判断App是否安装

private boolean isAppInstalled(Context context, String uri) {        PackageManager pm = context.getPackageManager();        boolean installed = false;        try {            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);            installed = true;        } catch (PackageManager.NameNotFoundException e) {            installed = false;        }        return installed;    }2. public boolean isAppInstalled(Context context, String packageName) {        final PackageManager packageManager = context.getPackageManager();        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);        List<String> pName = new ArrayList<String>();        if (pinfo != null) {            for (int i = 0; i < pinfo.size(); i++) {                String pn = pinfo.get(i).packageName;                pName.add(pn);            }        }        return pName.contains(packageName);    }例子：if (isInstallApp(MainActivity.this, "com.xxx")) {                    System.out.println("Installed!!");                } else {                    System.out.println("Not installed!!");                }

2.App请求root权限

  Process process = null;        DataOutputStream os = null;        try {            String cmd = "chmod 777 " + getPackageCodePath();            process = Runtime.getRuntime().exec("su"); // 切换到root帐号            os = new DataOutputStream(process.getOutputStream());            os.writeBytes(cmd + "\n");            os.writeBytes("exit\n");            os.flush();            process.waitFor();        } catch (Exception e) {            // return false;        } finally {            try {                if (os != null) {                    os.close();                }                process.destroy();            } catch (Exception e) {            }        }

3.App实现静默安装

http://blog.csdn.net/androidstarjack/article/details/50349999

http://www.jb51.net/article/78463.htm

http://blog.csdn.net/h3c4lenovo/article/details/9202323

4.查看apk信息，keystore或者jks信息

1、查看 keystore
$ keytool -list -v -keystore debug.keystore
$ keytool -list -v -keystore debug.keystore
Enter keystore password:
2、查看三方应用或是系统应用签名
打开待查看的apk，将其中META-INF文件夹解压出来，得到其中的CERT.RSA文件
$ keytool -printcert -file META-INF/CERT.RSA

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