QR code scanning and generation-third-party Open Source-ZXing, third-party Open Source-zxing

QR code scanning and generation-third-party Open Source-ZXing, third-party Open Source-zxing

Extraction of ZXing QR code Function lib: https://github.com/xuyisheng/ZXingLib

1. Scan the QR code:

This CaptureActivity class is used for scanning. We directly download libzxing from the above class as the Module, for example:

 

First, add the permission:

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

 

Since we use it as a Module, we can also use it directly. Here we can directly use the AndroidManifest about the CaptureActivity class in the dependency. copy the xml Registration Information and place it in our project:

<activity            android:name="com.xys.libzxing.zxing.activity.CaptureActivity"            android:configChanges="orientation|keyboardHidden"            android:screenOrientation="portrait"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"            android:windowSoftInputMode="stateAlwaysHidden">        </activity>

We declare a Button in activity_main.xml:

<Button android: id = "@ + id/btnSan" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "Scan QR code"/>

In JAVA code, add click events after initialization:

 findViewById(R.id.btnSan).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class), 0);            }        });

To view the returned result, add a TextView in activity_main.xml to view the result:

<TextView        android:id="@+id/tv_content"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />

After initialization, add the returned code to the JAVA code:

 @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        // TODO Auto-generated method stub        super.onActivityResult(requestCode, resultCode, data);        if (resultCode == RESULT_OK) {            String result = data.getExtras().getString("result");            tv_content.setText(result);        }    }

 

In this way, we can see the returned items. The following is the result of the example:

 

 

2. Generate a QR code:

To generate a QR code, we need three elements: the content to be generated, the generated button, and the storage of the generated content. Therefore, we need to add such elements in layou_main.xml.

<EditText android: id = "@ + id/et_input" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: layout_below = "@ + id/TV _content" android: layout_marginTop = "10dp" android: hint = "Enter the text of the QR code to be generated"/> <Button android: id = "@ + id/btn_generate" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: layout_below = "@ + id/et_input" android: layout_marginTop = "10dp" android: text = "generate QR code"/> <ImageView android: id = "@ + id/img" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_below = "@ + id/btn_generate" android: layout_centerHorizontal = "true" android: layout_marginTop = "10dp"/>

 

Initialize these controls and write them in the Button click event:

FindViewById (R. id. btn_generate ). setOnClickListener (new View. onClickListener () {@ Override public void onClick (View v) {String str = et_input.getText (). toString (); if (str. equals ("") {Toast. makeText (MainActivity. this, "cannot be blank", Toast. LENGTH_SHORT ). show ();} else {// bitmap try {/*** parameter: 1. text 2 3. the width and height of the QR code. the logo in the middle of the QR code */Bitmap bitmap = EncodingUtils. createQRCode (str, 500,500, null); // sets the image img. setImageBitmap (bitmap);} catch (Exception e) {// TODO Auto-generated catch block e. printStackTrace ();}}}});

 

Run the following code to generate the QR code:

Of course, there is no logo. If you need to add a logo, you only need

 Bitmap bitmap = EncodingUtils.createQRCode(str, 500, 500, null);

You can change the null value to the logo you need.

 

The complete code is as follows:

<? Xml version = "1.0" encoding = "UTF-8"?> <RelativeLayout 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: paddingBottom = "@ dimen/activity_vertical_margin" android: paddingLeft = "@ dimen/plugin" android: paddingRight = "@ dimen/plugin" android: paddingTop = "@ dimen/plugin" tools: context = "com. zzw. testerweima. mainActivity "> <Button android: id =" @ + id/btnSan "android: layout_width =" match_parent "android: layout_height =" wrap_content "android: text = "Scan QR code"/> <TextView android: id = "@ + id/TV _content" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_below = "@ + id/btnSan" android: layout_centerHorizontal = "true" android: layout_marginTop = "10dp"/> <EditText android: id = "@ + id/et_input" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: layout_below = "@ + id/TV _content" android: layout_marginTop = "10dp" android: hint = "Enter the text of the QR code to be generated"/> <Button android: id = "@ + id/btn_generate" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: layout_below = "@ + id/et_input" android: layout_marginTop = "10dp" android: text = "generate QR code"/> <ImageView android: id = "@ + id/img" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_below = "@ + id/btn_generate" android: layout_centerHorizontal = "true" android: layout_marginTop = "10dp"/> </RelativeLayout>

 

Package com. zzw. testerweima; import android. content. intent; import android. graphics. bitmap; import android. support. v7.app. appCompatActivity; import android. OS. bundle; import android. util. log; import android. view. view; import android. widget. editText; import android. widget. imageView; import android. widget. textView; import android. widget. toast; import com. xys. libzxing. zxing. activity. captureActivity; import com. xys. libzxing. zxing. encoding. encodingUtils; public class MainActivity extends AppCompatActivity {private TextView TV _content; private EditText et_input; private ImageView img; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); TV _content = (TextView) findViewById (R. id. TV _content); et_input = (EditText) findViewById (R. id. et_input); img = (ImageView) findViewById (R. id. img); findViewById (R. id. btnSan ). setOnClickListener (new View. onClickListener () {@ Override public void onClick (View v) {startActivityForResult (new Intent (MainActivity. this, CaptureActivity. class), 0) ;}}); findViewById (R. id. btn_generate ). setOnClickListener (new View. onClickListener () {@ Override public void onClick (View v) {String str = et_input.getText (). toString (); if (str. equals ("") {Toast. makeText (MainActivity. this, "cannot be blank", Toast. LENGTH_SHORT ). show ();} else {// bitmap try {/*** parameter: 1. text 2 3. the width and height of the QR code. the logo in the middle of the QR code */Bitmap bitmap = EncodingUtils. createQRCode (str, 500,500, null); // sets the image img. setImageBitmap (bitmap);} catch (Exception e) {// TODO Auto-generated catch block e. printStackTrace () ;}}}) ;}@ Override protected void onActivityResult (int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stub super. onActivityResult (requestCode, resultCode, data); if (resultCode = RESULT_ OK) {String result = data. getExtras (). getString ("result"); Log. d ("Main", result); TV _content.setText (result );}}}