權限：

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

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

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

在AndroidManifest中添加兩行代碼：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.sir.douyu">
    <uses-permission
        android:name="android.permission.CAMERA"/>
    <uses-permission
        android:name="READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.VIBRATE" />


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".main.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <activity android:name=".GuidePage">
        </activity>
        <activity
 

            android:name=".ScanActivity"
            android:screenOrientation="portrait" />
    </application>

</manifest>

如果想要豎屏顯示需要新建一個空的activity繼承CaptureActivity：

public class ScanActivity extends CaptureActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
}

 

在點擊事件中：

@Override
public void onClick(View v) {
    IntentIntegrator intentIntegrator = new IntentIntegrator(getActivity());
    intentIntegrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
    intentIntegrator.setCaptureActivity(ScanActivity.class);
    intentIntegrator.setPrompt("請掃描二維碼");//底部的提示文字，設為""可以置空
    intentIntegrator.setCameraId(0);//前置或者後置攝像頭
    intentIntegrator.setBeepEnabled(false); //掃描成功的「嗶嗶」聲，默認開啟
    intentIntegrator.setBarcodeImageEnabled(true);//是否保留掃碼成功時候的截圖
    intentIntegrator.initiateScan();

}
//繼續在下面寫上對結果的處理：
 


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {

    IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode,resultCode,data);
    if(scanResult!=null){
        String result = scanResult.getContents();
        Log.e("HYN",result);
        Toast.makeText(getContext(), result, Toast.LENGTH_SHORT).show();

    }

    super.onActivityResult(requestCode, resultCode, data);
}

實現掃一掃簡單功能