ReceiveMoney.java

package com.bitcoinandroid;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.ClipboardManager;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.bitcoin.core.Address;
import com.google.bitcoin.core.ECKey;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.client.android.Contents;
import com.google.zxing.client.android.Intents;
import com.google.zxing.client.android.encode.QRCodeEncoder;

public class ReceiveMoney extends Activity {

	private QRCodeEncoder qrCodeEncoder;
	int dimension;
	Address address;
	String amount;
	EditText amountField;
	TextView amountLabel;
	ApplicationState appState;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.receive_money);

		appState = (ApplicationState) getApplication();

		// prevent keyboard from opening
		getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

		dimension = getScreenWidth() * 7 / 8;

		ECKey key = appState.wallet.keychain.get(0);
		address = key.toAddress(appState.params);
		TextView addressField = (TextView) findViewById(R.id.address);
		addressField.setText(address.toString());

		generateQRCode(generateBitCoinURI());

		amountField = (EditText) findViewById(R.id.receive_amount);
		amountField.setWidth(dimension);
		amountLabel = (TextView) findViewById(R.id.receive_amount_label);
		amountLabel.setWidth(dimension);
		amountField.addTextChangedListener(new TextWatcher() {
			public void afterTextChanged(Editable s) {
				if (amount != s.toString()) {
					amount = s.toString();
					generateQRCode(generateBitCoinURI());
				}
			}

			public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
				// do nothing
			}

			public void onTextChanged(CharSequence s, int start, int before, int count) {
				// do nothing
			}
		});

		Button emailButton = (Button) this.findViewById(R.id.email_button);
		emailButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
				emailIntent.setType("text/plain");
				emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, 
						getString(R.string.pay_request_received_from) + address);
				
				StringBuilder message = new StringBuilder(getString(R.string.pay_request));
				message.append("\n\n").append(getString(R.string.pay_request_address_label)).append(address);
				if (!TextUtils.isEmpty(amount)) {
					message.append("\n").append(R.string.pay_request_amount_label)
						.append(amount).append(" BTC");
				}
				message.append("\n\n").append(getString(R.string.pay_request_thank_you));

				emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, message.toString());
				ReceiveMoney.this.startActivity(Intent.createChooser(emailIntent, "Send Request Via..."));
			}
		});

		Button copyButton = (Button) this.findViewById(R.id.copy_button);
		copyButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
				clipboard.setText(address.toString());
				Toast.makeText(ReceiveMoney.this, "Copied address to clipboard!", Toast.LENGTH_SHORT).show();
			}
		});
	}

	private int getScreenWidth() {
		Display display = getWindowManager().getDefaultDisplay();
		return display.getWidth();
	}

	private String generateBitCoinURI() {
		String uri = "bitcoin:";
		uri += address.toString() + "?";
		if (!TextUtils.isEmpty(amount)) {
			uri += "amount=" + amount;
		}
		return uri;
	}

	private void generateQRCode(String data) {
		Intent intent = new Intent(Intents.Encode.ACTION);
		intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
		intent.putExtra(Intents.Encode.TYPE, Contents.Type.TEXT);
		intent.putExtra(Intents.Encode.DATA, data);
		intent.putExtra(Intents.Encode.FORMAT, BarcodeFormat.QR_CODE.toString());

		qrCodeEncoder = new QRCodeEncoder(ReceiveMoney.this, intent);
		qrCodeEncoder.requestBarcode(handler, dimension);
	}

	private final Handler handler = new Handler() {
		@Override
		public void handleMessage(Message message) {
			switch (message.what) {
			case R.id.encode_succeeded:
				Bitmap image = (Bitmap) message.obj;
				ImageView view = (ImageView) findViewById(R.id.qr_code);
				view.setImageBitmap(image);
				// TextView contents = (TextView)
				// findViewById(R.id.contents_text_view);
				// contents.setText(qrCodeEncoder.getDisplayContents());
				break;
			case R.id.encode_failed:
				Toast.makeText(ReceiveMoney.this, "QR generation failed", Toast.LENGTH_LONG).show();
				qrCodeEncoder = null;
				break;
			}
		}
	};
}