Android uses code to enter Recovery mode to automatically upgrade the specified firmware package

From: http://blog.csdn.net/zhoumushui/article/details/50766041

Enter Recovery and automatically upgrade the upgrade package under the specified path, OTA download the firmware package to the specified path/sdcard/update.zip, and then execute the following code Enter Recovery to execute the installation:

private static File RECOVERY_DIR = new File("/cache/recovery");
private static File COMMAND_FILE = new File(RECOVERY_DIR, "command");

private static void recoveryMode(Context context) throws IOException {
String arg = "--update_package=/sdcard/update.zip";
RECOVERY_DIR.mkdirs();

FileWriter command = new FileWriter(COMMAND_FILE);
try {
command.write(arg); // write recoveryELF to /cache/recovery/command execution parameters.
command.write("\n");
} finally {
command.close();
}
PowerManager pm = (PowerManager) context
.getSystemService(Context.POWER_SERVICE);
pm.reboot("recovery"); // call reboot method in PowerManager class

throw new IOException("Reboot failed (no permissions?)");
}


Required Declare the REBOOT permission, which needs to be the system uid to invoke this permission.

    <uses-permission android:name="android.permission.REBOOT" />


General applications do not have permission, you can open the corresponding interface in the system application, and execute the above code after receiving the specified broadcast.