Android ZXing 二維碼、條形碼掃描介紹

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android :color/white"
    android:orientation="vertical" >
    <Button
        android:id="@+id/btn_scan_barcode"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:text="Open camera" />

    <LinearLayout 
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <TextView 
               android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android :color/black"
        android:textSize="18sp"
        android:text="Scan result：" />

        <TextView 
        android:id="@+id/tv_scan_result"
               android:layout_width="fill_parent"
               android:textSize="18sp"
               android:textColor="@android :color/black"
        android:layout_height="wrap_content" />
    </LinearLayout>

    <EditText 
        android:id="@+id/et_qr_string"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:hint="Input the text"/>

    <Button
        android:id="@+id/btn_add_qrcode"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Generate QRcode" />

    <ImageView 
        android:id="@+id/iv_qr_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_gravity="center"/>
</LinearLayout>

public class BarCodeTestActivity extends Activity {
    /** Called when the activity is first created. */
        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) {
                                //打開掃描界面掃描條形碼或二維碼
                                Intent openCameraIntent = new Intent(BarCodeTestActivity.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("")) {
                                                //根據字符串生成二維碼圖片并顯示在界面上，第二個參數為圖片的大小（350*350）
                                                Bitmap qrCodeBitmap = EncodingHandler.createQRCode(contentString, 350);
                                                qrImgImageView.setImageBitmap(qrCodeBitmap);
                                        }else {
                                                Toast.makeText(BarCodeTestActivity.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);
                //處理掃描結果（在界面上顯示）
                if (resultCode == RESULT_OK) {
                        Bundle bundle = data.getExtras();
                        String scanResult = bundle.getString("result");
                        resultTextView.setText(scanResult);
                }
        }
}