allprojects {
  repositories {
    maven { 
      url 'https://jitpack.io'
     }
  }
}

dependencies {
  compile 'com.github.goodboy321:Scan-Zxing:1.0'
}

<EditText
  android:id="@+id/et"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:hint="输入内容，生成二维码"
  android:text="http://www.baidu.com" />

<Button
  android:background="@color/colorAccent"
  android:id="@+id/btn2"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="生成二维码" />

<Button
  android:layout_marginTop="10dp"
  android:background="@color/colorPrimaryDark"
  android:id="@+id/btn1"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="扫码（识别相册中二维码）" />

<ImageView
  android:id="@+id/image"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal" />

<ImageView
  android:id="@+id/image_callback"
  android:layout_marginTop="10dp"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_gravity="center_horizontal" />

public void onClick(View view) {
  switch (view.getId()) {
    case R.id.btn1:
      Intent intent = new Intent(mContext, CaptureActivity.class);
      startActivityForResult(intent, REQUEST);
      break;
    case R.id.btn2:
      image.setVisibility(View.VISIBLE);
      //隐藏扫码结果view
      imageCallback.setVisibility(View.GONE);

      String content = et.getText().toString().trim();
      Bitmap bitmap = null;
      try {
        bitmap = BitmapUtils.create2DCode(content);//根据内容生成二维码
        tvResult.setVisibility(View.GONE);
        image.setImageBitmap(bitmap);
      } catch (Exception e) {
        e.printStackTrace();
      }
      break;
   }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (requestCode == REQUEST) {
    image.setVisibility(View.GONE);
    imageCallback.setVisibility(View.VISIBLE);

    String result = data.getStringExtra(CaptureActivity.SCAN_QRCODE_RESULT);
    Bitmap bitmap = data.getParcelableExtra(CaptureActivity.SCAN_QRCODE_BITMAP);

    if(bitmap != null){
      imageCallback.setImageBitmap(bitmap);//现实扫码图片
    }
  }