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   源码介绍

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public class MainActivity extends Activity {
	private TextView resultTextView;
	private EditText qrStrEditText;
	private ImageView qrImgImageView;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        resultTextView = (TextView) this.findViewById(R.id.tv_scan_result);
        qrStrEditText = (EditText) this.findViewById(R.id.et_qr_string);
        qrImgImageView = (ImageView) this.findViewById(R.id.iv_qr_image);
        
        Button scanBarCodeButton = (Button) this.findViewById(R.id.btn_scan_barcode);
        scanBarCodeButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
					
				Intent openCameraIntent = new Intent(MainActivity.this,CaptureActivity.class);
				startActivityForResult(openCameraIntent, 0);
			}
		});
        
        Button generateQRCodeButton = (Button) this.findViewById(R.id.btn_add_qrcode);
        generateQRCodeButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				try {
					String contentString = qrStrEditText.getText().toString();
					if (!contentString.equals("")) {
						
						Bitmap qrCodeBitmap = EncodingHandler.createQRCode(contentString, 350);
						qrImgImageView.setImageBitmap(qrCodeBitmap);
					}else {
						Toast.makeText(MainActivity.this, "Text can not be empty", Toast.LENGTH_SHORT).show();
					}
					
				} catch (WriterException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
    }

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
	
		if (resultCode == RESULT_OK) {
			Bundle bundle = data.getExtras();
			String scanResult = bundle.getString("result");
			resultTextView.setText(scanResult);
		}
	}
}