Android - 二维码扫一扫

1、教学视频：慕课网 http://www.imooc.com/note/648?sort=last

2、第三方包ZXing实现二维码扫描解析与生成功能；

3、Android Studio 项目目录：1、app  2、libzxing，app引用libzxing Module;

4、源代码:

　　解析二维码： startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class), 0); //0:requestCode

　　　　　　　　 protected void onActivityResult(int requestCode, int resultCode, Intent data) {...}

　　生成二维码： EncodingUtils.createQRCode("codeText", 500, 500, logoBitmap) ;

+ View Code?

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public class MainActivity extends AppCompatActivity {       private TextView qrCodeResult;     private EditText qrCodeEditText;     private ImageView qrCodeImageView;     private CheckBox useLogo;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);           qrCodeResult = (TextView) findViewById(R.id.qrCodeResult);         qrCodeEditText = (EditText) findViewById(R.id.qrCodeText);         qrCodeImageView = (ImageView) findViewById(R.id.qrCodeImageView);         useLogo = (CheckBox) findViewById(R.id.chk_useLogo);     }       public void scan(View view) {         startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class), 0); //0:requestCode     }       public void make(View view) {         String qrcodeText = qrCodeEditText.getText().toString();         if (qrcodeText.equals("")) {             Toast.makeText(MainActivity.this, "输入不能为空", Toast.LENGTH_SHORT).show();             return;         }         Bitmap qrcodeBitmap = EncodingUtils.createQRCode(qrcodeText, 500, 500,                 useLogo.isChecked() ? BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher) : null);         qrCodeImageView.setImageBitmap(qrcodeBitmap);       }       @Override     protected void onActivityResult(int requestCode, int resultCode, Intent data) {         super.onActivityResult(requestCode, resultCode, data);         if (resultCode == RESULT_OK && requestCode == 0) {             Bundle bundle = data.getExtras();             qrCodeResult.setText(bundle.getString("result"));         }     } }

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     tools:context="com.yizhui.qrcode.MainActivity">       <Button         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/scan_qrcode"         android:onClick="scan"/>     <TextView         android:id="@+id/qrCodeResult"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_margin="10dp"         />     <EditText         android:id="@+id/qrCodeText"         android:layout_width="match_parent"         android:layout_height="wrap_content" />     <Button         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/make_qrcode"         android:onClick="make"/>     <CheckBox         android:id="@+id/chk_useLogo"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/use_logo"/>     <ImageView         android:id="@+id/qrCodeImageView"         android:layout_gravity="center_horizontal"         android:layout_margin="20dp"         android:layout_width="wrap_content"         android:layout_height="wrap_content" /> </LinearLayout>