android扫码展示文本

要在Android应用中实现扫描二维码并展示文本信息，你可以按照以下步骤：

1. 添加ZXing库依赖。在`build.gradle`文件中添加如下依赖：

   implementation 'com.google.zxing:core:3.3.3'
   implementation 'com.journeyapps:zxing-android-embedded:3.6.0'

2. 在AndroidManifest.xml文件中添加如下权限和Activity：

   <uses-permission android:name="android.permission.CAMERA" />
   
   <application>
     <activity android:name="com.journeyapps.barcodescanner.CaptureActivity"
               android:screenOrientation="portrait"
               android:clearTaskOnLaunch="true"
               android:stateNotNeeded="true"
               android:windowSoftInputMode="stateAlwaysHidden">
       <intent-filter>
         <action android:name="com.google.zxing.client.android.SCAN" />
         <category android:name="android.intent.category.DEFAULT" />
       </intent-filter>
     </activity>
   </application>

3. 在需要扫码的界面中添加一个扫码按钮，并设置点击事件，在点击事件中调用扫码方法：

   button.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
           IntentIntegrator integrator = new IntentIntegrator(MainActivity.this);
           integrator.setCaptureActivity(CaptureActivity.class);
           integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
           integrator.setPrompt("请将二维码放入框内扫描");
           integrator.setOrientationLocked(false);
           integrator.setBeepEnabled(false);
           integrator.initiateScan();
       }
   });

4. 在Activity中实现`onActivityResult`方法，用于处理扫码结果，获取二维码中的文本信息，并展示在界面上：

   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
       IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
       if (result != null) {
           if (result.getContents() == null) {
               Toast.makeText(this, "扫码取消", Toast.LENGTH_LONG).show();
           } else {
               // 获取扫码结果中的文本信息
               String text = result.getContents();
               // 展示文本信息
               textView.setText(text);
           }
       } else {
           super.onActivityResult(requestCode, resultCode, data);
       }
   }

完整的代码示例：

public class MainActivity extends AppCompatActivity {

    private Button button;
    private TextView textView;

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

        button = findViewById(R.id.button);
        textView = findViewById(R.id.textView);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                IntentIntegrator integrator = new IntentIntegrator(MainActivity.this);
                integrator.setCaptureActivity(CaptureActivity.class);
                integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
                integrator.setPrompt("请将二维码放入框内扫描");
                integrator.setOrientationLocked(false);
                integrator.setBeepEnabled(false);
                integrator.initiateScan();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if (result != null) {
            if (result.getContents() == null) {
                Toast.makeText(this, "扫码取消", Toast.LENGTH_LONG).show();
            } else {
                // 获取扫码结果中的文本信息
                String text = result.getContents();
                // 展示文本信息
                textView.setText(text);
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

这样，你就可以在Android应用中实现扫码展示文本信息了。