Camera2拍照（备忘)

首先上布局代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_marginLeft="@dimen/fab_margin"
android:layout_marginRight="@dimen/fab_margin"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:fitsSystemWindows="true">

<TextureView
android:id="@+id/tv_textview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3" />

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">

<ImageView
android:id="@+id/iv_Thumbnail"
android:layout_width="50dp"
android:layout_height="70dp"
android:layout_alignParentLeft="true"
android:background="@drawable/bg_border"
android:visibility="gone" />
<ImageView
android:id="@+id/iv_Thumbnail2"
android:layout_width="50dp"
android:layout_height="70dp"
android:layout_toRightOf="@id/iv_Thumbnail"
android:layout_alignTop="@id/iv_Thumbnail"
android:layout_marginLeft="5dp"
android:visibility="gone" />
<ImageView
android:id="@+id/iv_Thumbnail3"
android:layout_width="50dp"
android:layout_height="70dp"
android:layout_toRightOf="@id/iv_Thumbnail2"
android:layout_alignTop="@id/iv_Thumbnail2"
android:layout_marginLeft="5dp"
android:visibility="gone" />

<Button
android:id="@+id/btn_takepic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="拍照" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/finishAndback"
android:layout_below="@id/btn_takepic"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
</LinearLayout>


Activity代码
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.SurfaceTexture;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.AudioAttributes;
import android.media.Image;
import android.media.ImageReader;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.util.Size;
import android.util.SparseIntArray;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import cn.com.zifar.Utility.ConstHelper;

import static cn.com.zifar.mobileforpatrol.R.id.iv_Thumbnail;

public class MyCameraActivity extends MyBaseActivity{
TextureView mTextureView;
ImageView mThumbnail;
Button mButton;
Handler mHandler,childHandler;
ImageReader mImageReader;
CaptureRequest.Builder mPreViewBuidler;
CameraCaptureSession mCameraSession;
CameraCharacteristics mCameraCharacteristics;
Ringtone ringtone;
private Size mPreViewSize;
private CameraDevice CameraDevice;
private CameraManager manager;
private String cameraid;
private Context context;
private List<Bitmap> MypicList;
private List<ImageView> MyImgList;

private static final SparseIntArray ORIENTATIONS = new SparseIntArray();

///为了使照片竖直显示
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_camera);
InitMyActivity();
InitTools();
context=this;
MypicList=new ArrayList<>();
FindView();
}

/**
* 显示图片
*/
private void ShowImg(){
runOnUiThread(new Runnable() {
@Override
public void run() {
if((MypicList!=null &&MypicList.size()>0) && (MyImgList!=null && MyImgList.size()>0))
for(int i=0;i<MyImgList.size();i++){
android.widget.ImageView img=MyImgList.get(i);
if(i>=MypicList.size()){
img.setVisibility(View.GONE);
break;
}
Bitmap bitmap=MypicList.get(i);
if(bitmap!=null){
img.setImageBitmap(bitmap);
img.setVisibility(View.VISIBLE);
}
}
}
});
}

/**
* 删除图片
* @param imageView
*/
private void DelImg(ImageView imageView){
int id=imageView.getId();
int index=0;
switch(id){
case R.id.iv_Thumbnail:
index=0;
break;
case R.id.iv_Thumbnail2:
index=1;
break;
case R.id.iv_Thumbnail3:
index=2;
break;
}
Drawable drawable = imageView.getDrawable();
if (drawable != null && drawable instanceof BitmapDrawable){
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
Bitmap bitmap = bitmapDrawable.getBitmap();
if (bitmap != null && !bitmap.isRecycled()) {
bitmap.recycle();
}
MypicList.set(index,null);
}
ClearNullBitmap();
//imageView.setWillNotDraw(true);
ShowImg();
}

private void ClearNullBitmap(){
List<Bitmap> nlist=new ArrayList<>();
if(MypicList!=null){
for(Bitmap bitmap:MypicList){
if(bitmap==null)continue;
nlist.add(bitmap);
}
}
MypicList=nlist;
}

private final class ImageViewClickListener implements ImageView.OnLongClickListener{
@Override
public boolean onLongClick(View v) {
DelImg((ImageView) v);
return true;
}
}

private void FindView(){
mTextureView = (TextureView) findViewById(R.id.tv_textview);
mButton = (Button) findViewById(R.id.btn_takepic);
MyImgList=new ArrayList<>();
ImageView mThumbnail = (ImageView) findViewById(iv_Thumbnail);
mThumbnail.setOnLongClickListener(new ImageViewClickListener());
MyImgList.add(mThumbnail);
ImageView iv_Thumbnail2=(ImageView)findViewById(R.id.iv_Thumbnail2);
iv_Thumbnail2.setOnLongClickListener(new ImageViewClickListener());
MyImgList.add(iv_Thumbnail2);
ImageView iv_Thumbnail3=(ImageView)findViewById(R.id.iv_Thumbnail3);
iv_Thumbnail3.setOnLongClickListener(new ImageViewClickListener());
MyImgList.add(iv_Thumbnail3);
ShowImg();

//初始化相机布局
mTextureView.setSurfaceTextureListener(mSurfacetextlistener);
//初始化拍照的声音
ringtone = RingtoneManager.getRingtone(MyCameraActivity.this, Uri.parse("file:///system/media/audio/ui/camera_click.ogg"));
AudioAttributes.Builder attr = new AudioAttributes.Builder();
attr.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION);
ringtone.setAudioAttributes(attr.build());
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(MypicList.size()>=3){
Toast.makeText(context,R.string.morethanmax,Toast.LENGTH_SHORT).show();
return;
}
shootSound();
try {
if(CameraDevice==null)return;
final CaptureRequest.Builder captureRequestBuilder;
captureRequestBuilder = CameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
// 将imageReader的surface作为CaptureRequest.Builder的目标
captureRequestBuilder.addTarget(mImageReader.getSurface());
// 自动对焦
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
// 自动曝光
captureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
// 获取手机方向
int rotation = getWindowManager().getDefaultDisplay().getRotation();
// 根据设备方向计算设置照片的方向
captureRequestBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
//拍照
CaptureRequest mCaptureRequest = captureRequestBuilder.build();
mCameraSession.capture(mCaptureRequest, null, childHandler);

} catch (Exception e) {
e.printStackTrace();
}
}
});
}

@Override
protected void onDestroy() {
if(CameraDevice!=null){
CameraDevice.close();
CameraDevice=null;
}
super.onDestroy();
}

/**
* 播放系统的拍照的声音
*/
public void shootSound() {
ringtone.stop();
ringtone.play();
}

//打开相机时候的监听器，通过他可以得到相机实例，这个实例可以创建请求建造者
private CameraDevice.StateCallback cameraOpenCallBack = new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice cameraDevice) {
CameraDevice=cameraDevice;
Log.d(ConstHelper.TagName, "相机已经打开");
try {
mPreViewBuidler = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
SurfaceTexture texture = mTextureView.getSurfaceTexture();
texture.setDefaultBufferSize(mPreViewSize.getWidth(), mPreViewSize.getHeight());

Surface surface = new Surface(texture);
mPreViewBuidler.addTarget(surface);

cameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()), mSessionStateCallBack, childHandler);
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void onDisconnected(CameraDevice cameraDevice) {
Log.d(ConstHelper.TagName, "相机连接断开");
}

@Override
public void onError(CameraDevice cameraDevice, int i) {
Log.d(ConstHelper.TagName, "相机打开失败");
}
};

//相机会话的监听器，通过他得到mCameraSession对象，这个对象可以用来发送预览和拍照请求
private CameraCaptureSession.StateCallback mSessionStateCallBack = new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession cameraCaptureSession) {
try {
mCameraSession = cameraCaptureSession;
mCameraSession.setRepeatingRequest(mPreViewBuidler.build(), mCaptureCallBack, childHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}

@Override
public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {

}
};

private CameraCaptureSession.CaptureCallback mCaptureCallBack=new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
super.onCaptureCompleted(session, request, result);

}

@Override
public void onCaptureProgressed(CameraCaptureSession session, CaptureRequest request, CaptureResult partialResult) {
super.onCaptureProgressed(session, request, partialResult);
}
};

private TextureView.SurfaceTextureListener mSurfacetextlistener=new TextureView.SurfaceTextureListener(){
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
HandlerThread thread = new HandlerThread("Ceamera3");
thread.start();
mHandler = new Handler(getMainLooper());
childHandler=new Handler(thread.getLooper());
manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
cameraid = CameraCharacteristics.LENS_FACING_FRONT + "";
try {
mCameraCharacteristics = manager.getCameraCharacteristics(cameraid);
StreamConfigurationMap map = mCameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
Size largest = Collections.max(Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)), new CompareSizeByArea());
mPreViewSize = map.getOutputSizes(SurfaceTexture.class)[0];
mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(), ImageFormat.JPEG, 5);
mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(final ImageReader reader) {
try{
Image image = reader.acquireNextImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);//由缓冲区存入字节数组
Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
if(bitmap!=null)
{
MypicList.add(bitmap);
ShowImg();
}
image.close();
}catch (Exception ex){
ex.printStackTrace();
}
}
}, mHandler);
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MyCameraActivity.this,new String[]{Manifest.permission.CAMERA},PackageManager.PERMISSION_GRANTED);
}
manager.openCamera(cameraid, cameraOpenCallBack, mHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
if(CameraDevice!=null){
CameraDevice.close();
CameraDevice=null;
}
return false;
}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {

}
};

}