Android拍照以及前后摄像头切换
16lz
2021-12-04
1.布局文件
2.代码
package com.example.lihui.androidproject;import android.Manifest;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Context;import android.content.pm.PackageManager;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.os.Build;import android.os.Bundle;import android.os.Environment;import android.view.Display;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.WindowManager;import android.widget.Button;import android.widget.Toast;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;public class MainActivity extends Activity{ private Button btnCamera=null; private Button chgCamera=null; private SurfaceView mySurfaceView =null; private Camera cam=null; private SurfaceHolder holder=null; private boolean previewRunning=false; private static final int FRONT = 1;//前置摄像头标记 private static final int BACK = 2;//后置摄像头标记 private int currentCameraType = -1;//当前打开的摄像头标记 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_main); if (Build.VERSION.SDK_INT >= 23) { int REQUEST_CODE_CONTACT = 101; String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.CAMERA}; for (String str : permissions) { if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) { this.requestPermissions(permissions, REQUEST_CODE_CONTACT); return; } } } btnCamera=findViewById(R.id.btn_camera); chgCamera=findViewById(R.id.change); mySurfaceView=findViewById(R.id.mySurfaceView); holder=this.mySurfaceView.getHolder(); holder.addCallback(new MySurfaceViewCallback()); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); holder.setFixedSize(800, 480); currentCameraType = BACK; btnCamera.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(cam!=null){ cam.autoFocus(new AutoFocusCallbackImpl()); } } }); chgCamera.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { try { changeCamera(); } catch (IOException e) { e.printStackTrace(); } } }); } private void changeCamera() throws IOException{ if(previewRunning){ cam.setPreviewCallback(null); cam.stopPreview(); cam.lock(); cam.release(); cam = null; } if(currentCameraType == FRONT){ cam = openCamera(BACK); }else if(currentCameraType == BACK){ cam = openCamera(FRONT); } cam.setPreviewDisplay(holder); cam.startPreview(); } @SuppressLint("NewApi") private Camera openCamera(int type){ int frontIndex =-1; int backIndex = -1; int cameraCount = Camera.getNumberOfCameras(); Camera.CameraInfo info = new Camera.CameraInfo(); for(int cameraIndex = 0; cameraIndex
3.AndroidManifest.xml文件
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