说明：本文使用的是Camera，不是Camera2，CameraX。

1、首先AndroidManifest添加相机使用权限

<!-- 相机相关 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

使用的activity添加硬件加速（默认开启，为啥要开启可自行百度）

android:hardwareAccelerated="true"

2、创建继承于TextureView的类MyTextureView（添贴代码）

package com.nxm.textureviewdemo;import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.graphics.drawable.BitmapDrawable;
import android.hardware.Camera;
import android.os.Build;
import android.os.Environment;
import android.util.AttributeSet;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.view.WindowManager;import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;/*** *************************************************************************************************** 修改日期                         修改人             任务名称                         功能或Bug描述* 2018/10/12 10:36                 MUZI102                                             TextureView类目* ***************************************************************************************************/
public class MyTextureView extends TextureView implements View.OnLayoutChangeListener {public Camera mCamera;private Context context;private Camera.Parameters param;private boolean isCanTakePicture = false;Matrix matrix;Camera camera;int mWidth = 0;int mHeight = 0;int mDisplayWidth = 0;int mDisplayHeight = 0;int mPreviewWidth = 640;int mPreviewHeight = 480;int orientation = 0;public MyTextureView(Context context, AttributeSet attrs) {super(context, attrs);this.context = context;init();}private void init() {if (null == mCamera) {mCamera = Camera.open();}this.setSurfaceTextureListener(new SurfaceTextureListener() {@Overridepublic void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {param = mCamera.getParameters();param.setPictureFormat(PixelFormat.JPEG);param.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);if (!Build.MODEL.equals("KORIDY H30")) {param.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦} else {param.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);}mCamera.setParameters(param);//变形处理RectF previewRect = new RectF(0, 0, mWidth, mHeight);double aspect = (double) mPreviewWidth / mPreviewHeight;if (getResources().getConfiguration().orientation== Configuration.ORIENTATION_PORTRAIT) {aspect = 1 / aspect;}if (mWidth < (mHeight * aspect)) {mDisplayWidth = mWidth;mDisplayHeight = (int) (mHeight * aspect + .5);} else {mDisplayWidth = (int) (mWidth / aspect + .5);mDisplayHeight = mHeight;}RectF surfaceDimensions = new RectF(0, 0, mDisplayWidth, mDisplayHeight);Matrix matrix = new Matrix();matrix.setRectToRect(previewRect, surfaceDimensions, Matrix.ScaleToFit.FILL);MyTextureView.this.setTransform(matrix);//<-处理变形int displayRotation = 0;WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);int rotation = windowManager.getDefaultDisplay().getRotation();switch (rotation) {case Surface.ROTATION_0:displayRotation = 0;break;case Surface.ROTATION_90:displayRotation = 90;break;case Surface.ROTATION_180:displayRotation = 180;break;case Surface.ROTATION_270:displayRotation = 270;break;}Camera.CameraInfo info = new Camera.CameraInfo();Camera.getCameraInfo(0, info);int orientation;if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {orientation = (info.orientation - displayRotation + 360) % 360;} else {orientation = (info.orientation + displayRotation) % 360;orientation = (360 - orientation) % 360;}mCamera.setParameters(param);mCamera.setDisplayOrientation(orientation);try {mCamera.setPreviewTexture(surfaceTexture);mCamera.startPreview();isCanTakePicture = true;} catch (Exception e) {e.printStackTrace();}}@Overridepublic void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height) {}@Overridepublic boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {if (mCamera != null) {mCamera.stopPreview();mCamera.release();mCamera = null;isCanTakePicture = true;}return true;}@Overridepublic void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {}});}/*** 拍照*/public void take() {if (mCamera != null && isCanTakePicture) {isCanTakePicture = false;mCamera.takePicture(new Camera.ShutterCallback() {@Overridepublic void onShutter() {}}, null, mPictureCallback);}}public void startPreview() {if (mCamera != null && !isCanTakePicture) {MyTextureView.this.setBackgroundDrawable(null);mCamera.startPreview();isCanTakePicture = true;}}public void stopPreview() {if (mCamera != null) {mCamera.stopPreview();}}public void releaseTextureView(){if (mCamera != null) {mCamera.stopPreview();mCamera.release();mCamera = null;isCanTakePicture = true;}}Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {if (mCamera != null) {mCamera.stopPreview();new FileSaver(data).save();}}};@Overridepublic void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {mWidth = right - left;mHeight = bottom - top;}private class FileSaver implements Runnable {private byte[] buffer;public FileSaver(byte[] buffer) {this.buffer = buffer;}public void save() {new Thread(this).start();}@Overridepublic void run() {try {File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM),System.currentTimeMillis() + ".png");file.createNewFile();FileOutputStream os = new FileOutputStream(file);BufferedOutputStream bos = new BufferedOutputStream(os);Bitmap bitmap = BitmapFactory.decodeByteArray(buffer, 0, buffer.length);bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);bos.flush();bos.close();os.close();MyTextureView.this.setBackgroundDrawable(new BitmapDrawable(bitmap));} catch (Exception e) {e.printStackTrace();}}}
}

3、acticity中使用

1、xml的布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"tools:context=".MainActivity"><com.nxm.textureviewdemo.MyTextureViewandroid:id="@+id/mytextureview"android:layout_width="match_parent"android:layout_height="match_parent" /><Buttonandroid:id="@+id/paizhai"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="拍照" /><Buttonandroid:id="@+id/yulan"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_toRightOf="@id/paizhai"android:text="预览" /></RelativeLayout>

2、使用

package com.nxm.textureviewdemo;import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;public class MainActivity extends AppCompatActivity {private MyTextureView myTextureView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);myTextureView = findViewById(R.id.mytextureview);findViewById(R.id.paizhai).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {myTextureView.take();}});findViewById(R.id.yulan).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {myTextureView.startPreview();}});}@Overrideprotected void onStart() {super.onStart();myTextureView.startPreview();}@Overrideprotected void onStop() {myTextureView.stopPreview();super.onStop();}@Overrideprotected void onDestroy() {myTextureView.releaseTextureView();super.onDestroy();}
}

原文TextureView实现相机预览、拍照功能_textureview怎么设置图片-CSDN博客