Android二维码开发学习教程

public class ScannerActivity extends AppCompatActivity implements ZXingScannerView.ResultHandler {
 private ZXingScannerView mZXingScannerView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mZXingScannerView = new ZXingScannerView(this); // 将ZXingScannerView作为布局
  setContentView(mZXingScannerView);
 }

 @Override
 protected void onResume() {
  super.onResume();
  mZXingScannerView.setResultHandler(this); // 设置处理结果回调
  mZXingScannerView.startCamera(); // 打开摄像头
 }

 @Override
 protected void onPause() {
  super.onPause();
  mZXingScannerView.stopCamera(); // 活动失去焦点的时候关闭摄像头
 }

 @Override
 public void handleResult(Result result) { // 实现回调接口，将数据回传并结束活动
  Intent data = new Intent();
  data.putExtra("text", result.getText());
  setResult(RESULT_OK, data);
  finish();
 }
} 

public class HomeActivity extends AppCompatActivity {
 private TextView mTextView;
 private WebView mWebView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_home);
  mTextView = (TextView) findViewById(R.id.tv);
  mWebView = (WebView) findViewById(R.id.wv);
 }

 public void scanCode(View view){
  startActivityForResult(new Intent(this, ScannerActivity.class), 1);
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (resultCode == RESULT_OK){
   mTextView.setText(data.getStringExtra("text")); // 显示识别到的文字
   mWebView.loadUrl(data.getStringExtra("text")); // 将识别的内容当作网址加载到WebView
  }
 }
}