源自：http://my.oschina.net/kooeasy/blog/478181
现在的收集一般都会提供相机功能，有些相机大镜头已经支持1000万以上的像素，有些还支持光学变焦，这些收集已经变成了抓也数码相机，为了充分利用手机上的相机功能，Android应用可以控制拍照和录制视频。
权限相关
|
1 2 3 4 5 6 7 8 |
|
拍照
一、通过系统Intent进行拍照
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 创建Uri方法一：//添加参数ContentValues values = new ContentValues();//设置文件名称values.put(MediaStore.Images.Media.DISPLAY_NAME, String.valueOf(System.currentTimeMillis())+".jpg");//设置文件类型values.put(MediaStore.Images.Media.MIME_TYPE, "image/png");//添加存储的位置的uriuri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); 创建Uri方法二：File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+System.currentTimeMillis()+".jpg");uri = Uri.fromFile(file); //添加图像方向intent.putExtra(MediaStore.Images.Media.ORIENTATION, 0);//设置图像输出位置intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); startActivityForResult(intent,1);
获取返回的图像路径
public static String getPathFromUri(Context mContext,Uri contentUri){ String[] proj = { MediaStore.Images.Media.DATA }; CursorLoader loader = new CursorLoader(mContext, contentUri, proj, null, null, null); Cursor cursor = loader.loadInBackground(); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index);}
通过路径加载Bitmap
Bitmap bitmap = BitmapFactory.decodeFile(getPathFromUri(this, uri));
二、利用Camrea拍照
1、调用Camera的open()打开相机
2、调用Camera的getParameters()获取拍照参数。该方法返回一个Camera.Paremeters对象
3、调用Camera.Parameters对象方法设置拍照的参数
4、调用Camera.startPreview()方法开始预览取景，在预览取景之前需要调用Camera的setPreviewDisplay(SurfaceHolder holder)方法设置使用哪个SurfaceView来显示取景图片。
5、调用Camera的takePicture()方法进行拍照
6、结束程序时，调用Camera的stopPreview()结束取景预览，并调用release()方法释放资源
public class CameraActivity extends Activity {
private SurfaceView mSurfaceView; private View mTake,mCancle; private SurfaceHolder mSurfaceHolder; private boolean isPreview = false; private Camera mCamera; private Camera.AutoFocusCallback autoFocusCallback = new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { if(success){ // 第一个监听器；当用户按下快门时激发该监听器 // 第二个监听器；当相机获取原始照片时激发该监听器 // 第三个监听器；当相机获取JPG照片时激发该监听器 mCamera.takePicture(new Camera.ShutterCallback() { @Override public void onShutter() { //快门按下时 } }, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { //此处代码可以决定是否需要保存原始照片信息 } }, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); //创建矩阵 旋转图像 Matrix matrix = new Matrix(); matrix.setRotate(90f,bitmap.getWidth()/2,bitmap.getHeight()/2); Bitmap bit =Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true); //销毁原图 bitmap.recycle();
mImage.setImageBitmap(bit); File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg"); FileOutputStream fos = null; try { fos = new FileOutputStream(file); bit.compress(Bitmap.CompressFormat.JPEG,100,fos); try {
fos.close(); } catch (IOException e) { e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } mCamera.stopPreview();; mCamera.startPreview(); isPreview=true; } }); } } }; private ImageView mImage;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); initView(); process(); setAllClick();
}
private void setAllClick() { mSurfaceHolder.addCallback(new SurfaceHolder.Callback() {
@Override public void surfaceCreated(SurfaceHolder holder) { initCamera(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
} @Override public void surfaceDestroyed(SurfaceHolder holder) { if (mCamera != null) { if (isPreview) { mCamera.stopPreview(); mCamera.release(); mCamera = null; } } } });
mTake.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //拍照 if (mCamera != null) { //添加自动聚焦 mCamera.autoFocus(autoFocusCallback);// takePhoto(); } } }); }
private int mPreviewWidth=0; private int mPreviewHeight=0;
/** * 初始化相机 */ private void initCamera() {
if(!isPreview){ //打开相机// mCamera = Camera.open(Camera.getNumberOfCameras()-1); mCamera = Camera.open(0);
} if(mCamera!=null&&!isPreview){ //获取相关设置 Camera.Parameters parameters = mCamera.getParameters();
List<Camera.Size> previewsizes = parameters.getSupportedPreviewSizes();
Iterator<Camera.Size> iterator = previewsizes.iterator(); while(iterator.hasNext()){ Camera.Size next = iterator.next(); if(next.width>mPreviewWidth&&next.height>mPreviewHeight){ mPreviewWidth=next.width; mPreviewHeight=next.height; } Log.i("TAG","camera->"+mPreviewWidth+":"+mPreviewHeight); }
Log.i("TAG","surface->"+mSurfaceView.getWidth()+":"+mSurfaceView.getHeight());
//设置预览招聘时每秒显示多少帧的最小值和最大值// parameters.setPreviewFpsRange(10, 20); //设置图片格式 parameters.setPictureFormat(PixelFormat.JPEG); //设置预览大小// parameters.setPreviewSize(mPreviewWidth, mPreviewHeight); //设置照片大小 parameters.setPictureSize(mPreviewWidth, mPreviewHeight); //设置JPG照片的质量 parameters.set("jpeg-quality", 100);
//设置取景的SutfaceView try { //设置显示方向 mCamera.setDisplayOrientation(90); mCamera.setParameters(parameters); //设置配置 mCamera.setPreviewDisplay(mSurfaceHolder); mCamera.startPreview(); } catch (IOException e) { e.printStackTrace(); } } isPreview=true; }
/** * 业务过程 */ private void process() {
mSurfaceHolder = mSurfaceView.getHolder(); //设置Surface不需要自己维护还冲区 mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); }
/** * 初始化视图 */ private void initView() { mSurfaceView =(SurfaceView) findViewById(R.id.camera_view); mTake = findViewById(R.id.take_photo); mCancle = findViewById(R.id.cancle); mImage = (ImageView)findViewById(R.id.image); }
}
录像
一、使用系统Intent
Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);//限制时长 sintent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 5);//限制大小 intent.putExtra(MediaStore.EXTRA_SIZE_LIMIT, 1024*1024);//设置质量intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);//设置输出位置intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);startActivityForResult(intent, 1);
返回
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data); if(resultCode==RESULT_OK){ Uri uri = data.getData(); //视频地址 String videoPath = getPathFromUri(this,uri); }}
public static String getPathFromUri(Context mContext,Uri contentUri){ String[] proj = { MediaStore.Images.Media.DATA }; CursorLoader loader = new CursorLoader(mContext, contentUri, proj, null, null, null); Cursor cursor = loader.loadInBackground(); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index);}
二、使用MediaRecord
public class RecordeActivity extends Activity {
private SurfaceView mRecordView; private View mStart, mStop; private boolean isRecord = false; private SurfaceHolder mSurfaceHolder;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recorde);
initView();
process();
setAllClick(); }
private void setAllClick() { mStart.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(!isRecord){ startRecord(); } } }); mStop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(isRecord){ //停止录制 mRecorder.stop(); //释放资源 mRecorder.release(); mRecorder=null; } } }); }
private File file; private MediaRecorder mRecorder;
/** * 开始录制 */ private void startRecord() { file = new File(Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".mp4"); try { //创建MediaPay对象 mRecorder = new MediaRecorder(); mRecorder.reset(); //设置从麦克风采集声音 mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //设置从摄像头采集图像 mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mRecorder.setOrientationHint(90); //设置视频文件输出格式，这个设置必须在声音编码格式，图像编码格式之前设置 mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); //设置声音编码格式、图像编码格式 mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); //设置视频大小 mRecorder.setVideoSize(1280, 960); //设置帧率 每秒32帧 mRecorder.setVideoFrameRate(32); //设置编码比特率 mRecorder.setVideoEncodingBitRate(5*1024*1024); mRecorder.setOutputFile(file.getAbsolutePath()); //指定使用Surface来预览视频 mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface()); //准备 mRecorder.prepare(); //开始录制 mRecorder.start(); isRecord = true; } catch (IOException e) { e.printStackTrace(); }
}
private void process() { mSurfaceHolder = mRecordView.getHolder(); mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mSurfaceHolder.setKeepScreenOn(true); }
private void initView() { mRecordView = (SurfaceView) findViewById(R.id.video_recorde); mStart = findViewById(R.id.start); mStop = findViewById(R.id.stop); }}
时间： 2024-10-23 05:35:04