Android相机Camera基础

一、概述
本章节主要讲述的Android相机Camera的相关知识点，主要包含三个方面，Android启动系统相机生成缩略图、Android启动系统相机生成原图以及Android自定义相机等。

二、Android启动系统相机
核心代码：

package com.czhappy.camerademo.activity;import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;import com.czhappy.camerademo.R;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;public class MainActivity extends AppCompatActivity {private static int REQ_1 = 1;private static int REQ_2 = 2;private ImageView image_iv;private String mFilePath;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);image_iv = (ImageView) findViewById(R.id.image_iv);mFilePath = Environment.getExternalStorageDirectory().getPath();mFilePath = mFilePath +"/" + System.currentTimeMillis()+".jpg";}public void startCamera1(View view){//隐式Intent调用Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(it, REQ_1);}public void startCamera2(View view){//隐式Intent调用Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);Uri photoUri = Uri.fromFile(new File(mFilePath));it.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);startActivityForResult(it, REQ_2);}public void customCamera(View view){Intent it = new Intent(MainActivity.this, CustomCameraActivity.class);startActivity(it);}/**** @param requestCode* @param resultCode* @param data //缩略图*/@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(resultCode == RESULT_OK){if(requestCode == REQ_1){//缩略图Bundle bundle = data.getExtras();Bitmap bmp = (Bitmap) bundle.get("data");image_iv.setImageBitmap(bmp);}else if(requestCode == REQ_2){//原图FileInputStream fis = null;try {fis = new FileInputStream(mFilePath);Bitmap bitmap = BitmapFactory.decodeStream(fis);image_iv.setImageBitmap(bitmap);} catch (FileNotFoundException e) {e.printStackTrace();}finally {try {fis.close();} catch (IOException e) {e.printStackTrace();}}}}}
}

三、Android自定义相机
1.自定义相机步骤：

创建相机
创建SurfaceView
关联相机与SurfaceView
调整相机显示效果
自定义相机预览界面

2.核心代码：
自定义相机CustomCameraActivity.java

package com.czhappy.camerademo.activity;import android.content.Intent;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;import com.czhappy.camerademo.R;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;/*** Description:* User: chenzheng* Date: 2016/12/27 0027* Time: 13:43*/
public class CustomCameraActivity extends AppCompatActivity implements SurfaceHolder.Callback{private SurfaceView mPreview;private Camera mCamera;private SurfaceHolder mHolder;private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {File tempFile = new File("/sdcard/temp.png");try {FileOutputStream fos = new FileOutputStream(tempFile);fos.write(data);fos.close();Intent it = new Intent(CustomCameraActivity.this, CaptureResultActivity.class);it.putExtra("picPath", tempFile.getAbsolutePath());startActivity(it);finish();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_custom_camera);mPreview = (SurfaceView) this.findViewById(R.id.preview);mHolder = mPreview.getHolder();mHolder.addCallback(this);//点击自动对焦mPreview.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {mCamera.autoFocus(null);;}});}/*** 拍照* @param view*/public void capture(View view){Camera.Parameters parameters = mCamera.getParameters();parameters.setPictureFormat(ImageFormat.JPEG);parameters.setPictureSize(800,400);parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);//自动对焦mCamera.autoFocus(new Camera.AutoFocusCallback() {@Overridepublic void onAutoFocus(boolean success, Camera camera) {//对焦准确拍摄照片if(success){mCamera.takePicture(null, null, mPictureCallback);}}});}/*** 获取相机对象* @return*/private Camera getCamera(){mCamera = Camera.open();return mCamera;}/*** 开始预览相机内容*/private void setStartPreview(Camera camera, SurfaceHolder holder){try {camera.setPreviewDisplay(holder);camera.setDisplayOrientation(90);//设置相机预览为竖屏90度camera.startPreview();} catch (IOException e) {e.printStackTrace();}}/*** 释放相机资源*/private void releaseCamera(){if(mCamera!=null){mCamera.setPreviewCallback(null);mCamera.stopPreview();mCamera.release();mCamera = null;}}@Overrideprotected void onResume() {super.onResume();if (mCamera==null){mCamera = getCamera();if(mHolder!=null){setStartPreview(mCamera, mHolder);}}}@Overrideprotected void onPause() {super.onPause();releaseCamera();}@Overridepublic void surfaceCreated(SurfaceHolder holder) {setStartPreview(mCamera, mHolder);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {mCamera.stopPreview();setStartPreview(mCamera, mHolder);}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {releaseCamera();}
}

生成图片结果页面CaptureResultActivity.java

package com.czhappy.camerademo.activity;import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;import com.czhappy.camerademo.R;import java.io.FileInputStream;
import java.io.FileNotFoundException;/*** Description:* User: chenzheng* Date: 2016/12/30 0030* Time: 13:27*/
public class CaptureResultActivity extends AppCompatActivity {private String picPath;private ImageView result_iv;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_capture_result);picPath = getIntent().getStringExtra("picPath");result_iv = (ImageView) findViewById(R.id.result_iv);try {FileInputStream fis = new FileInputStream(picPath);Bitmap bitmap = BitmapFactory.decodeStream(fis);Matrix matrix = new Matrix();matrix.setRotate(90);//旋转90度矩阵bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);result_iv.setImageBitmap(bitmap);} catch (FileNotFoundException e) {e.printStackTrace();}}
}

四、项目源代码下载

http://download.csdn.net/detail/chenzheng8975/9725645

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