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    <p>Not sure what you mean by "manually": Do you mean "manually" as in GUI/user interaction, or "manually" as "I do it in my own application code"?</p> <p>Some suggestions though:</p> <p>If you can make your BT devices discoverable at all, you could do it this way:</p> <ol> <li>Make your BT device discoverable</li> <li>Let Android search for and find the device and then initiate a connection</li> <li>Android will ask for the PIN for pairing with the device; enter the PIN.</li> <li>Once pairing was successful, Android stores the pairing information for future use, so that you can</li> <li>Make your BT device invisible again.</li> </ol> <p>From then on your app should be able to connect to the BT device at any time without further pairing operations.</p> <p>If the said is not an option for you, maybe you want to go another way:</p> <p>In current Android versions there are different API routines implemented which are neither documented nor exposed in the normal SDK. A hack kind of solution may be to use some of these "hidden" ("@hide"...) APIs, either via reflection or via modification of your SDK installation.</p> <p>But be aware that this is always a <em>hack</em> and it may work on a specific device with a specific version of Android and is likely to break your app on another device and/or any other Android version.</p> <p>Having said that, here comes some reference:</p> <p><a href="http://wiresareobsolete.com/wordpress/2010/11/android-bluetooth-rfcomm/" rel="nofollow">Example of how to access "hidden" bluetooth API</a>.</p> <p>Then, have a look at the source code for android.bluetooth.BluetoothDevice, e.g. <a href="https://github.com/CyanogenMod/android_frameworks_base/blob/gingerbread/core/java/android/bluetooth/BluetoothDevice.java" rel="nofollow">here</a>.</p> <p>In there, <code>public boolean createBond(){...}</code> may do what you want.</p>
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