Android调用前后摄像头 Android调用前后摄像头同时工作实例代码
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硬件环境：小米4
Android版本：6.0
咱们先看效果图：
我把代码贴出来：
AndroidMainfest.xml文件（需要新增camera权限）：
<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：主要是对2个surfaceView的显示渲染
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();
}
/**
* 后置摄像头回调
*/
class surfaceholderCallbackBack implements SurfaceHolder.Callback {
@Override
public void surfaceCreated(SurfaceHolder holder) {
// 获取camera对象
int cameraCount = Camera.getNumberOfCameras();
if (cameraCount > 0) {
camera1 = Camera.open(0);
try {
// 设置预览监听
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);
// 启动摄像头预览
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();// 实现相机的参数初始化
camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。
}
}
});
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
// 相机参数的初始化设置
private void initCamera() {
parameters = camera1.getParameters();
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦
setDispaly(parameters, camera1);
camera1.setParameters(parameters);
camera1.startPreview();
camera1.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上
}
// 控制图像的正确显示方向
private void setDispaly(Camera.Parameters parameters, Camera camera) {
if (Integer.parseInt(Build.VERSION.SDK) >= 8) {
setDisplayOrientation(camera, 90);
} else {
parameters.setRotation(90);
}
}
// 实现的图像的正确显示
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", "图像出错");
}
}
}
class surfaceholderCallbackFont implements SurfaceHolder.Callback {
@Override
public void surfaceCreated(SurfaceHolder holder) {
// 获取camera对象
int cameraCount = Camera.getNumberOfCameras();
if (cameraCount == 2) {
camera2 = Camera.open(1);
}
try {
// 设置预览监听
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);
// 启动摄像头预览
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连续对焦
setDispaly(parameters, camera2);
camera2.setParameters(parameters);
camera2.startPreview();
camera2.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上
camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。
}
}
});
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
// 控制图像的正确显示方向
private void setDispaly(Camera.Parameters parameters, Camera camera) {
if (Integer.parseInt(Build.VERSION.SDK) >= 8) {
setDisplayOrientation(camera, 90);
} else {
parameters.setRotation(90);
}
}
// 实现的图像的正确显示
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", "图像出错");
}
}
}
}
可能出现的问题：
1、没有权限，需要手动打开，代码里由于追求简便，没有主动申请，只在mainfest中注册了
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