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Android調(diào)用前后攝像頭同時(shí)工作實(shí)例代碼

 更新時(shí)間：2017年07月07日 10:46:39   作者：賴床的貓  
本篇文章主要介紹了Android調(diào)用前后攝像頭同時(shí)工作實(shí)例代碼，這里整理了詳細(xì)的代碼,具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下。

硬件環(huán)境：小米4

Android版本：6.0

咱們先看效果圖：

我把代碼貼出來：

AndroidMainfest.xml文件（需要新增camera權(quán)限）：

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

activity_main.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context="com.bihu.qdemopush.MainActivity">

<LinearLayout
  android:layout_width="match_parent"
  android:layout_height="200dp"
  android:orientation="horizontal">
  <SurfaceView
    android:id="@+id/surfaceview1"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="fill_parent" />
  <SurfaceView
    android:id="@+id/surfaceview2"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_marginLeft="5dp"
    android:layout_height="fill_parent" />
</LinearLayout>
</LinearLayout>

MainActivity.java文件：主要是對(duì)2個(gè)surfaceView的顯示渲染

public class MainActivity extends AppCompatActivity {

SurfaceView surfaceview1, surfaceview2;
SurfaceHolder surfaceholder1, surfaceholder2;
String TAG = "MainActivity";
private Camera camera1 = null, camera2;
Camera.Parameters parameters;

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

  surfaceview1 = (SurfaceView) findViewById(R.id.surfaceview1);
  surfaceview2 = (SurfaceView) findViewById(R.id.surfaceview2);
  surfaceholder1 = surfaceview1.getHolder();
  surfaceholder1.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  surfaceholder1.addCallback(new surfaceholderCallbackBack());

  surfaceholder2 = surfaceview2.getHolder();
  surfaceholder2.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  surfaceholder2.addCallback(new surfaceholderCallbackFont());
}

@Override
protected void onDestroy() {
  Log.e(TAG, "onDestroy");
  super.onDestroy();
}

/**
 * 后置攝像頭回調(diào)
 */
class surfaceholderCallbackBack implements SurfaceHolder.Callback {
  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    // 獲取camera對(duì)象
    int cameraCount = Camera.getNumberOfCameras();
    if (cameraCount > 0) {
      camera1 = Camera.open(0);
      try {
        // 設(shè)置預(yù)覽監(jiān)聽
        camera1.setPreviewDisplay(holder);
        Camera.Parameters parameters = camera1.getParameters();

        if (MainActivity.this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
          parameters.set("orientation", "portrait");
          camera1.setDisplayOrientation(90);
          parameters.setRotation(90);
        } else {
          parameters.set("orientation", "landscape");
          camera1.setDisplayOrientation(0);
          parameters.setRotation(0);
        }
        camera1.setParameters(parameters);
        // 啟動(dòng)攝像頭預(yù)覽
        camera1.startPreview();
        System.out.println("camera.startpreview");

      } catch (IOException e) {
        e.printStackTrace();
        camera1.release();
        System.out.println("camera.release");
      }
    }
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    camera1.autoFocus(new Camera.AutoFocusCallback() {
      @Override
      public void onAutoFocus(boolean success, Camera camera) {
        if (success) {
          initCamera();// 實(shí)現(xiàn)相機(jī)的參數(shù)初始化
          camera.cancelAutoFocus();// 只有加上了這一句，才會(huì)自動(dòng)對(duì)焦。
        }
      }
    });

  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {

  }

  // 相機(jī)參數(shù)的初始化設(shè)置
  private void initCamera() {
    parameters = camera1.getParameters();
    parameters.setPictureFormat(PixelFormat.JPEG);
    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1連續(xù)對(duì)焦
    setDispaly(parameters, camera1);
    camera1.setParameters(parameters);
    camera1.startPreview();
    camera1.cancelAutoFocus();// 2如果要實(shí)現(xiàn)連續(xù)的自動(dòng)對(duì)焦，這一句必須加上
  }

  // 控制圖像的正確顯示方向
  private void setDispaly(Camera.Parameters parameters, Camera camera) {
    if (Integer.parseInt(Build.VERSION.SDK) >= 8) {
      setDisplayOrientation(camera, 90);
    } else {
      parameters.setRotation(90);
    }

  }

  // 實(shí)現(xiàn)的圖像的正確顯示
  private void setDisplayOrientation(Camera camera, int i) {
    Method downPolymorphic;
    try {
      downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[]{int.class});
      if (downPolymorphic != null) {
        downPolymorphic.invoke(camera, new Object[]{i});
      }
    } catch (Exception e) {
      Log.e("Came_e", "圖像出錯(cuò)");
    }
  }
}

class surfaceholderCallbackFont implements SurfaceHolder.Callback {
  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    // 獲取camera對(duì)象
    int cameraCount = Camera.getNumberOfCameras();
    if (cameraCount == 2) {
      camera2 = Camera.open(1);
    }
    try {
      // 設(shè)置預(yù)覽監(jiān)聽
      camera2.setPreviewDisplay(holder);
      Camera.Parameters parameters = camera2.getParameters();

      if (MainActivity.this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
        parameters.set("orientation", "portrait");
        camera2.setDisplayOrientation(90);
        parameters.setRotation(90);
      } else {
        parameters.set("orientation", "landscape");
        camera2.setDisplayOrientation(0);
        parameters.setRotation(0);
      }
      camera2.setParameters(parameters);
      // 啟動(dòng)攝像頭預(yù)覽
      camera2.startPreview();
      System.out.println("camera.startpreview");

    } catch (IOException e) {
      e.printStackTrace();
      camera2.release();
      System.out.println("camera.release");
    }
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    camera2.autoFocus(new Camera.AutoFocusCallback() {
      @Override
      public void onAutoFocus(boolean success, Camera camera) {
        if (success) {
          parameters = camera2.getParameters();
          parameters.setPictureFormat(PixelFormat.JPEG);
          parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1連續(xù)對(duì)焦
          setDispaly(parameters, camera2);
          camera2.setParameters(parameters);
          camera2.startPreview();
          camera2.cancelAutoFocus();// 2如果要實(shí)現(xiàn)連續(xù)的自動(dòng)對(duì)焦，這一句必須加上
          camera.cancelAutoFocus();// 只有加上了這一句，才會(huì)自動(dòng)對(duì)焦。
        }
      }
    });

  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {

  }

  // 控制圖像的正確顯示方向
  private void setDispaly(Camera.Parameters parameters, Camera camera) {
    if (Integer.parseInt(Build.VERSION.SDK) >= 8) {
      setDisplayOrientation(camera, 90);
    } else {
      parameters.setRotation(90);
    }

  }

  // 實(shí)現(xiàn)的圖像的正確顯示
  private void setDisplayOrientation(Camera camera, int i) {
    Method downPolymorphic;
    try {
      downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[]{int.class});
      if (downPolymorphic != null) {
        downPolymorphic.invoke(camera, new Object[]{i});
      }
    } catch (Exception e) {
      Log.e("Came_e", "圖像出錯(cuò)");
    }
  }
}
}

可能出現(xiàn)的問題：

1、沒有權(quán)限，需要手動(dòng)打開，代碼里由于追求簡(jiǎn)便，沒有主動(dòng)申請(qǐng)，只在mainfest中注冊(cè)了

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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