Using Android KeyChain 

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/**
 * This method will launch an intent to install the key chain
 */
public static final String PKCS12_FILENAME = "keychain.p12"; 
private static final String DEFAULT_ALIAS = "My Key Chain";
private static final int INSTALL_KEYCHAIN_CODE = 1;
private void installPkcs12() {
    try {
        // prepare a PKCS12 format file with filename *.p12 or *.pfx
        BufferedInputStream bis = new BufferedInputStream(getAssets().open(
                PKCS12_FILENAME));
        byte[] keychain = new byte[bis.available()];
        bis.read(keychain);

        Intent installIntent = KeyChain.createInstallIntent();
        installIntent.putExtra(KeyChain.EXTRA_PKCS12, keychain);
        installIntent.putExtra(KeyChain.EXTRA_NAME, DEFAULT_ALIAS);
        startActivityForResult(installIntent, INSTALL_KEYCHAIN_CODE);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == INSTALL_KEYCHAIN_CODE) {
        switch (resultCode) {
            case Activity.RESULT_OK:
                chooseCert();
                break;
            default:
                super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

private void chooseCert() {
    KeyChain.choosePrivateKeyAlias(this, this, // Callback
            new String[] {}, // Any key types.
            null, // Any issuers.
            "localhost", // Any host
            -1, // Any port
            DEFAULT_ALIAS);
}

/**
 * This implements the KeyChainAliasCallback
 */
@Override
public void alias(String alias) {
    // callback to get the alias set by the user
}

References

Android SDK KeyChainDemo
Android KeyChain