Android新手开发之旅-二维码的生成和扫描

liu

二维码的生成和扫描




本次将使用github上的开源框架zxing来实现二维码的生成和扫描


首先在build.gradle中添加 compile 'cn.yipianfengye.android:zxing-library:2.2'

添加权限

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  <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.VIBRATE" />

然后在Application中执行初始化操作

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public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        
        ZXingLibrary.initDisplayOpinion(this);
    }
}

生成：

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 String textContent = mEditText.getText().toString();
                if (TextUtils.isEmpty(textContent)) {
                    Toast.makeText(MainActivity.this, "请输入内容!", Toast.LENGTH_SHORT).show();
                    return;
                }
                //生成不带Logo的二维码
//                Bitmap mBitmap = CodeUtils.createImage(textContent, 400, 400, null);
//                mImageView.setImageBitmap(mBitmap);
                //生成带Logo的二维码
                Bitmap mBitmap = CodeUtils.createImage(textContent, 400, 400, BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
                mImageView.setImageBitmap(mBitmap);

扫描：

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//打开默认二维码扫描界面
                Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                startActivityForResult(intent, REQUEST_CODE);

在Activity的onActivityResult方法中接收扫描结果:

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 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            //处理扫描结果（在界面上显示）
            if (null != data) {
                Bundle bundle = data.getExtras();
                if (bundle == null) {
                    return;
                }
                if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_SUCCESS) {
                    String result = bundle.getString(CodeUtils.RESULT_STRING);
                    Toast.makeText(this, "解析结果:" + result, Toast.LENGTH_LONG).show();
                } else if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_FAILED) {
                    Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show();
                }
            }
        }
    }

完整代码：


activity_main.xml:

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<?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"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="20dp"
    tools:context="com.company.helloworld.test.MainActivity">

    <EditText
        android:id="@+id/et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

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

    <ImageView
        android:id="@+id/iv"
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:layout_marginTop="20dp" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:text="扫描二维码" />
</LinearLayout>

MyApplication:

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public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        ZXingLibrary.initDisplayOpinion(this);
    }
}

AndroidManifest.xml:


        

MainActivity:

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public class MainActivity extends AppCompatActivity {
    private Button mButton1;
    private Button mButton2;
    private EditText mEditText;
    private ImageView mImageView;
    private final int REQUEST_CODE = 2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
    }

    private void initView() {
        mButton1 = (Button) findViewById(R.id.btn);
        mButton2 = (Button) findViewById(R.id.btn2);
        mEditText = (EditText) findViewById(R.id.et);
        mImageView = (ImageView) findViewById(R.id.iv);

        mButton1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String textContent = mEditText.getText().toString();
                if (TextUtils.isEmpty(textContent)) {
                    Toast.makeText(MainActivity.this, "请输入内容!", Toast.LENGTH_SHORT).show();
                    return;
                }
                //生成不带Logo的二维码
//                Bitmap mBitmap = CodeUtils.createImage(textContent, 400, 400, null);
//                mImageView.setImageBitmap(mBitmap);
                //生成带Logo的二维码
                Bitmap mBitmap = CodeUtils.createImage(textContent, 400, 400, BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
                mImageView.setImageBitmap(mBitmap);
            }
        });
        mButton2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    //打开默认二维码扫描界面
                    Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                    startActivityForResult(intent, REQUEST_CODE);
                }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE) {
            //处理扫描结果（在界面上显示）
            if (null != data) {
                Bundle bundle = data.getExtras();
                if (bundle == null) {
                    return;
                }
                if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_SUCCESS) {
                    String result = bundle.getString(CodeUtils.RESULT_STRING);
                    Toast.makeText(this, "解析结果:" + result, Toast.LENGTH_LONG).show();
                } else if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_FAILED) {
                    Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show();
                }
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}

效果图：


        

Amy

强烈支持楼主ing……

范范

我只是路过打酱油的。

竹林风

强烈支持楼主ing……

惜

楼主加油，我们都看好你哦。