Android实现调用摄像头拍照与视频功能 |
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Android实现调用摄像头拍照与视频功能
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应用场景： 在Android开发过程中，有时需要调用手机自身设备的功能，上篇文章主要侧重摄像头拍照功能的调用。本篇文章将综合实现拍照与视频的操作。 知识点介绍： 该部分请阅读 【Android 调用摄像头功能】 使用方式： 第一步： 新建一个Android项目CameraPhotoVedio,包含两个Activity: MainActivity、CameraActivity。 第二步： activity_main.xml MainActivity.java import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { private Button button; //调用摄像头按钮 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); } private void initViews() { button = (Button) findViewById(R.id.main_button); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(getApplicationContext(), CameraActivity.class)); } }); } }activity_camera.xml CameraActivity.java import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Date; import com.example.cameraphotovideo.utils.FormatUtil; import android.graphics.ImageFormat; import android.hardware.Camera; import android.hardware.Camera.PictureCallback; import android.media.MediaRecorder; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.app.Activity; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class CameraActivity extends Activity { private String tag ="MaHaochen_______CameraActivity"; private SurfaceView surfaceView; private SurfaceHolder surfaceHolder; private Camera camera; private MediaRecorder mediaRecorder; private Button photoButton; //拍照按钮 private Button vedioButton; //摄像按钮 private TextView timeTextView; protected boolean isPreview = false; //摄像区域是否准备良好 private boolean isRecording = true; // true表示没有录像，点击开始；false表示正在录像，点击暂停 private boolean bool; private int hour = 0; private int minute = 0; //计时专用 private int second = 0; private File mRecVedioPath; private File mRecAudioFile; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); initCamera(); initViews(); } //初始化摄像头 private void initCamera() { mRecVedioPath = new File(Environment.getExternalStorageDirectory() .getAbsolutePath() + "/mahc/video/temp/"); if (!mRecVedioPath.exists()) { mRecVedioPath.mkdirs(); } surfaceView = (SurfaceView) findViewById(R.id.camera_surfaceview); SurfaceHolder cameraSurfaceHolder = surfaceView.getHolder(); cameraSurfaceHolder.addCallback(new Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { try { camera = Camera.open(); //设置Camera的角度/方向 camera.setDisplayOrientation(90); Camera.Parameters parameters = camera.getParameters(); parameters.setPreviewFrameRate(5); // 每秒5帧 parameters.setPictureFormat(ImageFormat.JPEG);// 设置照片的输出格式 parameters.set("jpeg-quality", 85);// 照片质量 camera.setParameters(parameters); camera.setPreviewDisplay(holder); isPreview = true; camera.startPreview(); } catch (IOException e) { e.printStackTrace(); } surfaceHolder = holder; } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { surfaceHolder = holder; } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera != null) { if (isPreview) { camera.stopPreview(); isPreview = false; } camera.release(); camera = null; // 记得释放Camera } surfaceView = null; surfaceHolder = null; mediaRecorder = null; } }); //开发时建议设置 //This method was deprecated in API level 11. this is ignored, this value is set automatically when needed. cameraSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } //初始化视图组件 private void initViews() { timeTextView = (TextView) findViewById(R.id.camera_time); timeTextView.setVisibility(View.GONE); photoButton = (Button) findViewById(R.id.camera_photo); vedioButton = (Button) findViewById(R.id.camera_vedio); ButtonOnClickListener onClickListener = new ButtonOnClickListener(); photoButton.setOnClickListener(onClickListener); vedioButton.setOnClickListener(onClickListener); } class ButtonOnClickListener implements OnClickListener{ @Override public void onClick(View v) { switch (v.getId()) { case R.id.camera_vedio: //点击开始录像 if(isRecording){ if (isPreview) { camera.stopPreview(); camera.release(); camera = null; } second = 0; minute = 0; hour = 0; bool = true; if(null==mediaRecorder){ mediaRecorder = new MediaRecorder(); }else { mediaRecorder.reset(); } //表面设置显示记录媒体（视频）的预览 mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface()); //开始捕捉和编码数据到setOutputFile（指定的文件） mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //设置用于录制的音源 mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //设置在录制过程中产生的输出文件的格式 mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); //设置视频编码器，用于录制 mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); //设置audio的编码格式 mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); //设置要捕获的视频的宽度和高度 mediaRecorder.setVideoSize(320, 240); // 设置要捕获的视频帧速率 mediaRecorder.setVideoFrameRate(15); try { mRecAudioFile = File.createTempFile("Vedio", ".3gp", mRecVedioPath); } catch (IOException e) { e.printStackTrace(); } mediaRecorder.setOutputFile(mRecAudioFile.getAbsolutePath()); try { mediaRecorder.prepare(); timeTextView.setVisibility(View.VISIBLE); handler.postDelayed(task, 1000); mediaRecorder.start(); } catch (Exception e) { e.printStackTrace(); } isRecording = !isRecording; Log.e(tag, "=====开始录制视频====="); }else { //点击停止录像 bool = false; mediaRecorder.stop(); timeTextView.setText(FormatUtil.format(hour)+":"+FormatUtil.format(minute)+":"+ FormatUtil.format(second)); mediaRecorder.release(); mediaRecorder = null; FormatUtil.videoRename(mRecAudioFile); Log.e(tag, "=====录制完成，已保存====="); isRecording = !isRecording; try { camera = Camera.open(); Camera.Parameters parameters = camera.getParameters(); // parameters.setPreviewFrameRate(5); // 每秒5帧 parameters.setPictureFormat(ImageFormat.JPEG);// 设置照片的输出格式 parameters.set("jpeg-quality", 85);// 照片质量 camera.setParameters(parameters); camera.setPreviewDisplay(surfaceHolder); camera.startPreview(); isPreview = true; } catch (Exception e) { e.printStackTrace(); } } break; case R.id.camera_photo: if (mediaRecorder != null) { try { bool = false; mediaRecorder.stop(); timeTextView.setText(FormatUtil.format(hour) + ":" + FormatUtil.format(minute) + ":" + FormatUtil.format(second)); mediaRecorder.release(); mediaRecorder = null; FormatUtil.videoRename(mRecAudioFile); } catch (Exception e) { e.printStackTrace(); } isRecording = !isRecording; Log.e(tag, "=====录制完成，已保存====="); try { camera = Camera.open(); Camera.Parameters parameters = camera.getParameters(); // parameters.setPreviewFrameRate(5); // 每秒5帧 parameters.setPictureFormat(ImageFormat.JPEG);// 设置照片的输出格式 parameters.set("jpeg-quality", 85);// 照片质量 camera.setParameters(parameters); camera.setPreviewDisplay(surfaceHolder); camera.startPreview(); isPreview = true; } catch (Exception e) { e.printStackTrace(); } } if (camera != null) { camera.autoFocus(null); camera.takePicture(null, null, new PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { new SavePictureTask().execute(data); camera.startPreview(); Log.e(tag,"=====拍照成功====="); } }); // 拍照 } break; default: break; } } } /* * 定时器设置，实现计时 */ private Handler handler = new Handler(); private Runnable task = new Runnable() { public void run() { if (bool) { handler.postDelayed(this, 1000); second++; if (second >= 60) { minute++; second = second % 60; } if (minute >= 60) { hour++; minute = minute % 60; } timeTextView.setText(FormatUtil.format(hour) + ":" + FormatUtil.format(minute) + ":" + FormatUtil.format(second)); } } }; class SavePictureTask extends AsyncTask { @Override protected String doInBackground(byte[]... params) { String path = Environment.getExternalStorageDirectory() .getAbsolutePath() + "/mahc/image"; File out = new File(path); if (!out.exists()) { out.mkdirs(); } File picture = new File(path+"/"+new Date().getTime()+".jpg"); try { FileOutputStream fos = new FileOutputStream(picture.getPath()); fos.write(params[0]); fos.close(); } catch (Exception e) { e.printStackTrace(); } Log.e(tag, "=====照片保存完成====="); CameraActivity.this.finish(); return null; } } }第三步：该项目需要一个工具类FormatUtil.java import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import android.os.Environment; public class FormatUtil { /** * 将缓存文件夹的数据转存到vedio文件下 * @param recAudioFile */ public static void videoRename(File recAudioFile) { String path = Environment.getExternalStorageDirectory() .getAbsolutePath()+ "/mahc/video/"+ "0" + "/"; String fileName = new SimpleDateFormat("yyyyMMddHHmmss") .format(new Date()) + ".3gp"; File out = new File(path); if (!out.exists()) { out.mkdirs(); } out = new File(path, fileName); if (recAudioFile.exists()) recAudioFile.renameTo(out); } /** * 用以计时操作的相关方法 * @param num * @return */ public static String format(int num){ String s = num + ""; if (s.length() == 1) { s = "0" + s; } return s; } }第四步：本项目需要处理界面的背景样式和按钮的背景，所以需要在res/drawable文件新建shape_main.xml。 页面效果： 效果截图
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