android 7 Custom Camera Preview and Photographing Function
- 2021-09-11 21:25:47
- OfStack
In this paper, we share the functions of Android, such as camera switching, taking pictures, saving to photo albums, previewing, etc., and solve the problems that android7 can't preview continuously after taking pictures, the related problems of parameter setting, and the language reversal of front and rear cameras.
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;
import com.hama.tracker.R;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class CamaraActivity extends Activity implements View.OnClickListener {
@Bind(R.id.return_back)
TextView returnBack;
@Bind(R.id.tvswitch_camera)
TextView tvswitchCamera;
//启动摄像机
private Camera mCamera;
public boolean isopen_camara = false;
private SurfaceView surfaceView;
private SurfaceHolder mholder = null;
private SurfaceCallback previewCallBack;
private boolean isTakingPhoto;//是否正在拍照
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
verifyPermission(new String[]{Manifest.permission.CAMERA});
// getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_camara);
ButterKnife.bind(this);
// 预览控件
surfaceView = (SurfaceView) this
.findViewById(R.id.surfaceView);
// 设置参数
surfaceView.getHolder().setKeepScreenOn(true);
surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
returnBack.setOnClickListener(this);
tvswitchCamera.setOnClickListener(this);
EventBus.getDefault().register(this);
}
public void verifyPermission(String[] permissions) {
if (permissions != null) {
List<String> lists = new ArrayList<>();
for (int i = 0; i < permissions.length; i++) {
if (ActivityCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[i])) {
}
lists.add(permissions[i]);
}
}
if (lists.size() > 0) {
String[] ps = new String[lists.size()];
for (int i = 0; i < lists.size(); i++) {
ps[i] = lists.get(i);
}
ActivityCompat.requestPermissions(this, ps, 1);
}
}
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onStart() {
super.onStart();
}
private void takePhoto() {
if (!isopen_camara) {
previewCallBack = new SurfaceCallback();
surfaceView.getHolder().addCallback(previewCallBack);
} else {
autoTakePhoto();
}
}
@Override
protected void onResume() {
super.onResume();
if(mCamera == null){
if (!isopen_camara) {
previewCallBack = new SurfaceCallback();
surfaceView.getHolder().addCallback(previewCallBack);
}
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.return_back:
finish();
break;
case R.id.tvswitch_camera:
switchCamara();
break;
}
}
// 预览界面回调
private final class SurfaceCallback implements SurfaceHolder.Callback {
// 预览界面被创建
public void surfaceCreated(SurfaceHolder holder) {
try {
//1代表打开后置摄像头,0代表打开前置摄像头.
mCamera = Camera.open(cameraPosition);// 打开摄像头
setParams(holder,cameraPosition);
} catch (Exception e) {
e.printStackTrace();
if (mCamera != null) {
mCamera.stopPreview();
mCamera.lock();
mCamera.release();
mCamera = null;
}
finish();
//Toast.makeText(getApplicationContext(), "该手机不支持自动拍照功能", Toast.LENGTH_LONG).show();
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
System.out.println("surfaceChanged");
isopen_camara = true;
//autoTakePhoto();
}
// 预览界面被销毁
public void surfaceDestroyed(SurfaceHolder holder) {
System.out.println("surfaceDestroyed");
if(!isopen_camara)
return;
if (mCamera != null) {
holder.removeCallback(this);
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.lock();
mCamera.release();
mCamera = null;
}
}
}
public void reset(){
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
if (mCamera != null) {
if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){
surfaceView.getHolder().removeCallback(previewCallBack);
}
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.lock();
mCamera.release();
mCamera = null;
mCamera = Camera.open(cameraPosition);
if (null != mholder)
setParams(mholder,cameraInfo.facing);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mCamera != null) {
if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){
surfaceView.getHolder().removeCallback(previewCallBack);
}
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.lock();
mCamera.release();
mCamera = null;
}
ButterKnife.unbind(this);
EventBus.getDefault().unregister(this);
}
private void setParams(SurfaceHolder mySurfaceView,int postion) {
try {
int PreviewWidth = 0;
int PreviewHeight = 0;
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);//获取窗口的管理器
/*PreviewWidth = display.();
PreviewHeight = display.getHeight();*/
Camera.Parameters parameters = mCamera.getParameters();
// 选择合适的预览尺寸
List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes();
// 如果sizeList只有1个我们也没有必要做什么了，因为就他1个别无选择
if (sizeList.size() > 1) {
Iterator<Camera.Size> itor = sizeList.iterator();
while (itor.hasNext()) {
Camera.Size cur = itor.next();
/*if (cur.width >= PreviewWidth
&& cur.height >= PreviewHeight) {*/
if (cur.width >= PreviewWidth
&& cur.height >= PreviewHeight) {
PreviewWidth = cur.width;
PreviewHeight = cur.height;
break;
}
}
}
parameters.setPreviewSize(PreviewWidth, PreviewHeight); //获得摄像区域的大小
//parameters.setPreviewFrameRate(3);//每秒3帧 每秒从摄像头里面获得3个画面
//parameters.setPreviewFpsRange(3,);
List<int[]> list = parameters.getSupportedPreviewFpsRange();
int[] v = null;
int index = 0;
int min = 0;
for (int i = 0; i < list.size(); i++) {
v = list.get(i);
if (v[0] > min) {
min = v[0];
index = i;
}
}
parameters.setPreviewFpsRange(list.get(index)[0], list.get(index)[1]);
parameters.setPictureFormat(PixelFormat.JPEG);//设置照片输出的格式
parameters.set("jpeg-quality", 85);//设置照片质量
parameters.setPictureSize(PreviewWidth, PreviewHeight);//设置拍出来的屏幕大小
parameters.setRotation(180); //Java部分
if (Build.VERSION.SDK_INT >= 24) {
if(postion == 0){
mCamera.setDisplayOrientation(90);
}else {
mCamera.setDisplayOrientation(270);
}
} else {
mCamera.setDisplayOrientation(90);
}
mCamera.setParameters(parameters);//把上面的设置 赋给摄像头
mCamera.setPreviewDisplay(mySurfaceView);//把摄像头获得画面显示在SurfaceView控件里面
mholder = mySurfaceView;
mCamera.setPreviewCallback(new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
}
});
mCamera.startPreview();//开始预览
// mPreviewRunning = true;
} catch (IOException e) {
Log.e("tag", e.toString());
}
}
Handler handler = null;
private void autoTakePhoto() {
// 拍照前需要对焦 获取清析的图片
if (null == mCamera) return;
mCamera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (success && isopen_camara) {
// 对焦成功
// Toast.makeText(MainActivity.this, "对焦成功 !!",Toast.LENGTH_SHORT).show();
if(!isTakingPhoto) {
isTakingPhoto = true;
handler = new Handler();
handler.post(new Runnable() {
@Override
public void run() {
mCamera.takePicture(null, null, new MyPictureCallback());
}
});
}
}
}
});
}
// 照片回调
private final class MyPictureCallback implements Camera.PictureCallback {
// 照片生成后
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
Matrix matrix = new Matrix();
matrix.setRotate(270);
File jpgFile = new File(Environment.getExternalStorageDirectory() + "/DCIM/camera");
if (!jpgFile.exists()) {
jpgFile.mkdir();
}
File jpgFile1 = new File(jpgFile.getAbsoluteFile(), System.currentTimeMillis() + ".jpg");
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
FileOutputStream fos = new FileOutputStream(jpgFile1);
bitmap.compress(Bitmap.CompressFormat.JPEG, 80, fos);
ToastUtils.show(getApplicationContext(), getString(R.string.save_success));
fos.close();
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri uri = Uri.fromFile(jpgFile1);
intent.setData(uri);
sendBroadcast(intent);
} catch (Exception e) {
e.printStackTrace();
}finally {
if(Build.VERSION.SDK_INT>=24){
reset();
}
isTakingPhoto = false;
}
}
}
private int cameraPosition = 1;//0代表前置摄像头，1代表后置摄像头
private void switchCamara() {
//切换前后摄像头
int cameraCount = 0;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();//得到摄像头的个数
for (int i = 0; i < cameraCount; i++) {
Camera.getCameraInfo(i, cameraInfo);//得到每1个摄像头的信息
if (cameraPosition == 1) {
//现在是后置，变更为前置
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {//代表摄像头的方位，CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置
if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){
surfaceView.getHolder().removeCallback(previewCallBack);
}
mCamera.setPreviewCallback(null);
mCamera.stopPreview();//停掉原来摄像头的预览
mCamera.lock();
mCamera.release();//释放资源
mCamera = null;//取消原来摄像头
mCamera = Camera.open(i);//打开当前选中的摄像头
/* try {
if (null != mholder)
mCamera.setPreviewDisplay(mholder);//通过surfaceview显示取景画面
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mCamera.startPreview();//开始预览*/
if (null != mholder)
setParams(mholder,Camera.CameraInfo.CAMERA_FACING_BACK);
cameraPosition = 0;
break;
}
} else {
//现在是前置， 变更为后置
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {//代表摄像头的方位，CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置
if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){
surfaceView.getHolder().removeCallback(previewCallBack);
}
mCamera.setPreviewCallback(null);
mCamera.stopPreview();//停掉原来摄像头的预览
mCamera.lock();
mCamera.release();//释放资源
mCamera = null;//取消原来摄像头
mCamera = Camera.open(i);//打开当前选中的摄像头
/*try {
if (null != mholder)
mCamera.setPreviewDisplay(mholder);//通过surfaceview显示取景画面
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mCamera.startPreview();//开始预览*/
if (null != mholder)
setParams(mholder,Camera.CameraInfo.CAMERA_FACING_FRONT);
cameraPosition = 1;
break;
}
}
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {///音量减拍照
takePhoto();
return true;
}
return super.onKeyDown(keyCode, event);
}
}