二維碼在我們生活中隨處可見。在我眼裏簡直能夠用“泛濫”來形容啦。那怎樣在我們Android項目中掃描識別二維碼或生成二維碼圖片呢？
我們通常使用的開源框架是zxing。在github上的開源地址：https://github.com/zxing/zxing，眼下在做的項目中也用到這個框架，     
所以自己做了個demo，方便學習及下次使用。

識別二維碼

 /**
 * 掃描二維碼演示樣例
 */
public class ScanCodeActivity extends Activity implements View.OnClickListener {
    private
 
 Button start_scan;
    private TextView result_tv;
    private final static int REQUEST_CODE = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);
        this.start_scan = (Button) findViewById(R.id.start_scan);
        this
 
.result_tv = (TextView) findViewById(R.id.result_tv);
        this.start_scan.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.start_scan) {
            //zxing框架已經幫我們封裝好相應的實現類。直接調用startActivityForResult就可以
            Intent intent = new Intent(this
 
, CaptureActivity.class);
            startActivityForResult(intent, REQUEST_CODE);
        }
    }

    /**
     * 在onActivityResult中處理數據
     * @param requestCode
     * @param resultCode
     * @param data
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE) {
            Bundle bundle = data.getExtras();
            String scanResult = bundle.getString("result");
            this.result_tv.setText(scanResult);
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}

生成二維碼：

/**
 * 生成二維碼演示樣例
 */
public class MadeCodeActivity extends Activity implements View.OnClickListener {
    private EditText code_edt;
    private Button made_code;
    private ImageView result_iv;
    private CheckBox logo_cb;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_made);
        this.code_edt = (EditText) findViewById(R.id.code_edt);
        this.made_code = (Button) findViewById(R.id.made_code);
        this.result_iv = (ImageView) findViewById(R.id.result_iv);
        logo_cb = (CheckBox) findViewById(R.id.logo_cb);
        this.made_code.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.made_code) {
            String content = code_edt.getText().toString().trim();
            boolean isAddLogo = logo_cb.isChecked();
            if (TextUtils.isEmpty(content)) {
                Toast.makeText(this, "輸入內容不能為空", Toast.LENGTH_LONG).show();
                return;
            }
            madeCode(content, isAddLogo);
        }
    }

    /**
     * 生成二維碼
     *
     * @param content   要生成圖片的文字內容
     * @param isAddLogo 是否在二維碼中加入LOGO圖片
     */
    private void madeCode(String content, boolean isAddLogo) {
        String bitmapPath;
        if (!isAddLogo) {//不帶LOGO
            bitmapPath = EncodeUtil.createQRImage(this, content, 300, 300, null);
        } else {//帶Logo，R.mipmap.ic_launcher就是LOGO相應圖片，自行加入
            bitmapPath = EncodeUtil.createQRImage(this, content, 300, 300, BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
        }
        if (!TextUtils.isEmpty(bitmapPath)) {
            result_iv.setImageBitmap(BitmapFactory.decodeFile(bitmapPath));
        }
    }
}

完畢的項目（AndroidStudio項目）下載地址：
http://download.csdn.net/detail/true100/9487162

Android二維碼工具zxing使用