自定义相机步骤
1.创建相机
2.创建SurfaceView
3.关联相机和SurfaceView
4.调整相机的显示效果
5.自定义相机预览界面
CustomActivity：
public class CustomActivity extends AppCompatActivity implements SurfaceHolder.Callback {
private Camera mCamera;
private SurfaceView mPriview;
private SurfaceHolder mHolder;
private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
//data完成拍完之后照片的数据
File tempFile = new File ("/sdcard/temp.png");
try {
FileOutputStream fos = new FileOutputStream(tempFile);
try {
fos.write(data);
fos.close();
Intent intent = new Intent (CustomActivity.this,ResultActivity.class);
intent.putExtra("picPath",tempFile.getAbsolutePath());
startActivity(intent);
CustomActivity.this.finish();
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
};
@Bind(R.id.take_photo)
Button takePhoto;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_custom);
ButterKnife.bind(this);
mPriview = (SurfaceView) findViewById(R.id.preview);
mHolder = mPriview.getHolder();
mHolder.addCallback(this);
takePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPictureFormat(ImageFormat.JPEG);
parameters.setPreviewSize(400, 240);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
//success代表对焦是否准确
if (success) {
mCamera.takePicture(null, null, mPictureCallback);
}
}
});
}
});
//设置相机自动对焦
mPriview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.autoFocus(null);
}
});
}
/**
* 获取Camerad对象
*
* @return
*/
private Camera getCamera() {
Camera camera;
try {
camera = Camera.open();
} catch (Exception e) {
camera = null;
e.printStackTrace();
}
return camera;
}
@Override
protected void onPause() {
super.onPause();
releaseCamera();
}
@Override
protected void onResume() {
super.onResume();
if (mCamera == null) {
mCamera = getCamera();
if (mHolder != null) {
setStartPreview(mCamera, mHolder);
}
}
}
/**
* 开始预览相机内容
*/
private void setStartPreview(Camera camera, SurfaceHolder holder) {
try {
//将holder对象传递到Camera对象中,完成绑定操作
camera.setPreviewDisplay(holder);
//将Camera预览角度进行调整90°
camera.setDisplayOrientation(90);
//开始在surface预览操作,但是是横屏的，在预览之前增加一个setDisplayOrientation方法
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 释放相机占用的资源，请求了Camera但是没有释放会出现错误，所以建议跟系统生命周期绑定
*/
private void releaseCamera() {
if (mCamera != null) {
//将相机的回调置空,取消mCamera跟surfaceView的关联操作
mCamera.setPreviewCallback(null);
//取消掉相机取景功能
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
//开始camera与surfaceview的绑定
setStartPreview(mCamera, holder);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
//重启整个功能，首先stopCamera,将相机进行关闭
mCamera.stopPreview();
setStartPreview(mCamera, holder);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
releaseCamera();
}
}
ResultActivity：
public class ResultActivity extends AppCompatActivity {
@Bind(R.id.pic)
ImageView pic;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
ButterKnife.bind(this);
String path = getIntent().getStringExtra("picPath");
try {
FileInputStream fis = new FileInputStream(path);
Bitmap bitmap = BitmapFactory.decodeStream(fis);
//矩阵,用来设置拍完照之后的角度
Matrix matrix = new Matrix();
matrix.setRotate(90);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
pic.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Bitmap bitmap = BitmapFactory.decodeFile(path);
// pic.setImageBitmap(bitmap);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
>
<Button
android:text="调用自定义相机拍照"
android:id="@+id/take_photo"
android:layout_width="match_parent"
android:layout_height="50dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/preview"/>
<TextView
android:layout_width="wrap_content"
android:text="Android Studio CameraTest"
android:textColor="#44FF0000"
android:textSize="20sp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="126dp" />
</RelativeLayout>
</LinearLayout><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:layout_width="match_parent"
android:scaleType="fitCenter"
android:layout_height="match_parent"
android:id="@+id/pic"/>
</RelativeLayout>
需要添加的权限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />