生成二維碼 和 掃描二維碼
阿新 • • 發佈：2018-12-15
導依賴
implementation 'cn.bingoogolapple:bga-qrcode-zxing:1.3.4'許可權
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />dimens.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <dimen name="qr_code_size">200dp</dimen> </resources>
MainActivity
public class MainActivity extends AppCompatActivity { private ImageView mimageView; private EditText meditText; private Button create,scan; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); //點選生成 create.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { createQRCode(); } }); //點選掃描 scan.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { checkPermission(); } }); } private void checkPermission() { //第一步，判斷系統版本是否為6.0以上 if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){ //第二步：checkSelfPermission判斷有沒有此許可權 //第一個引數：上下文 //第二個引數：我們想要判斷的許可權，此處為相機許可權 //PackageManager.PERMISSION_GRANTED 條件，許可權有沒有被授予 if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { //如果沒授予，則申請許可權 //第一個：上下文 //第二個：要申請的許可權陣列，此處為相機許可權 //第三個：請求碼，startActivityForResult一樣 ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},100); } }else{ startActivity(new Intent(MainActivity.this, ScanActivity.class)); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); //如果requestCode匹配，切許可權申請通過 if(requestCode == 100 && grantResults[0] == PackageManager.PERMISSION_GRANTED){ startActivity(new Intent(MainActivity.this, ScanActivity.class)); } } private void createQRCode() { QRTask qrTask = new QRTask(this, mimageView, meditText); qrTask.execute(meditText.getText().toString()); } private void initView() { meditText=findViewById(R.id.edit); mimageView=findViewById(R.id.image); scan=findViewById(R.id.scan); create=findViewById(R.id.create); } static class QRTask extends AsyncTask<String,Void,Bitmap>{ private WeakReference<Context> mContext; private WeakReference<ImageView> mImageView; public QRTask(Context context,ImageView imageView,EditText editText) { mContext=new WeakReference<>(context); mImageView=new WeakReference<>(imageView); } @Override protected Bitmap doInBackground(String... strings) { String str=strings[0]; if(TextUtils.isEmpty(str)){ return null; } int size=mContext.get().getResources().getDimensionPixelOffset(R.dimen.qr_code_size); return QRCodeEncoder.syncEncodeQRCode(str,size); } @Override protected void onPostExecute(Bitmap bitmap) { super.onPostExecute(bitmap); if (bitmap != null) { mImageView.get().setImageBitmap(bitmap); } else { Toast.makeText(mContext.get(), "生成失敗", Toast.LENGTH_SHORT).show(); } } } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout 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=".MainActivity"> <Button android:id="@+id/scan" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="掃描" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> <EditText android:id="@+id/edit" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_constraintTop_toBottomOf="@id/scan" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" /> <Button android:id="@+id/create" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="生成" app:layout_constraintTop_toBottomOf="@+id/edit" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" /> <ImageView android:id="@+id/image" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintTop_toBottomOf="@+id/create" android:src="@mipmap/ic_launcher" /> </android.support.constraint.ConstraintLayout>
ScanActivity掃碼跳轉
public class ScanActivity extends AppCompatActivity implements QRCodeView.Delegate {
private ZXingView mZXingView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan);
mZXingView = findViewById(R.id.zxingview);
mZXingView.setDelegate(this);
}
@Override
protected void onResume() {
super.onResume();
mZXingView.startCamera();
mZXingView.startSpotAndShowRect();
}
@Override
protected void onStop() {
super.onStop();
mZXingView.stopCamera();
}
@Override
protected void onDestroy() {
super.onDestroy();
mZXingView.onDestroy();
Toast.makeText(ScanActivity.this,11+"",Toast.LENGTH_SHORT).show();
}
@Override
public void onScanQRCodeSuccess(String result) {
if(result!=null){
Intent intent=new Intent(ScanActivity.this,ContentActivity.class);
intent.putExtra("result",result);
startActivity(intent);
}
Toast.makeText(ScanActivity.this,result,Toast.LENGTH_SHORT).show();
}
@Override
public void onCameraAmbientBrightnessChanged(boolean isDark) {
}
@Override
public void onScanQRCodeOpenCameraError() {
}
}activity_scan.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".ScanActivity">
<cn.bingoogolapple.qrcode.zxing.ZXingView
android:id="@+id/zxingview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.constraint.ConstraintLayout>展示二維碼內容頁面
public class ContentActivity extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content);
textView=findViewById(R.id.text);
Intent intent=getIntent();
textView.setText(intent.getStringExtra("result"));
}
}activity_content.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".ContentActivity">
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.constraint.ConstraintLayout>