二维码生成,扫描

1. 在project的build.gradle添加如下代码(如下图）

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

2. 在Module的build.gradle添加依赖

compile 'com.github.open-android:Zxing:v1.0.3'

3.清单文件添加权限

<uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.FLASHLIGHT" />

4.添加布局视图并在MainActivity中添加id

4.1：

?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="test.bwie.com.wzq_17108.MainActivity"
    android:orientation="vertical">

    <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://baidu.com" />

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

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="扫码（支持识别相册二维码）" />

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


    <TextView
        android:id="@+id/tv_result"
        android:text="扫描返回bitmap"
        android:gravity="center"
        android:textSize="18sp"
        android:textColor="#FF0000"
        android:layout_marginTop="30dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

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

4.2  ： 界面添加ID和点击事件 继承 调用扫描和生成二维码功能

implements View.OnClickListener

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private Button mBtn1;
    private EditText mEt;
    private Button mBtn2;
    private ImageView mImage;
    private final static int REQ_CODE = 1028;
    private Context mContext;
    private TextView mTvResult;
    private ImageView mImageCallback;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //控件的点击事件和 Id
        initView();
        mContext = this;
    }

    private void initView() {
        //id控件
        mEt = (EditText) findViewById(R.id.et);
        mBtn1 = (Button) findViewById(R.id.btn1);
        mBtn2 = (Button) findViewById(R.id.btn2);
        mImage = (ImageView) findViewById(R.id.image);
        mTvResult = (TextView) findViewById(R.id.tv_result);
        mImageCallback = (ImageView) findViewById(R.id.image_callback);

        //点击事件
        mBtn1.setOnClickListener(this);
        mBtn2.setOnClickListener(this);
        mImage.setOnClickListener(this);
        mTvResult.setOnClickListener(this);
        mImageCallback.setOnClickListener(this);
    }

    //重写的onclick 事件
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn1:
//                startActivity(new Intent(MainActivity.this, CaptureActivity.class));
                Intent intent = new Intent(mContext, CaptureActivity.class);
                startActivityForResult(intent, REQ_CODE);
                break;
            case R.id.btn2:
                mImage.setVisibility(View.VISIBLE);
                //隐藏扫码结果view
                mImageCallback.setVisibility(View.GONE);
                mTvResult.setVisibility(View.GONE);

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


    //扫描二维码返回的结果
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQ_CODE) {
            mImage.setVisibility(View.GONE);
            mTvResult.setVisibility(View.VISIBLE);
            mImageCallback.setVisibility(View.VISIBLE);

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

            mTvResult.setText("扫码结果："+result);
            showToast("扫码结果：" + result);
            if(bitmap != null){
                mImageCallback.setImageBitmap(bitmap);//现实扫码图片
            }
        }

    }
    //调用返回的二维码 吐司打印
    private void showToast(String msg) {
        Toast.makeText(mContext, "" + msg, Toast.LENGTH_SHORT).show();
    }

}

运行效果