? ? ? 現在的手機一般都會提供相機功能，有些相機大鏡頭已經支持1000萬以上的像素，有些還支持光學變焦，這些手機已經變成了專業數碼相機，為了充分利用手機上的相機功能，Android應用可以控制拍照和錄制視頻。
首先在項目中添加以下權限
拍照
一、通過系統Intent進行拍照
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
創建Uri方法一：
//添加參數
ContentValues values = new ContentValues();
//設置文件名稱
values.put(MediaStore.Images.Media.DISPLAY_NAME, String.valueOf(System.currentTimeMillis())+".jpg");
//設置文件類型
values.put(MediaStore.Images.Media.MIME_TYPE, "image/png");
//添加存儲的位置的uri
uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
創建Uri方法二：
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+System.currentTimeMillis()+".jpg");
uri = Uri.fromFile(file);
//添加圖像方向
intent.putExtra(MediaStore.Images.Media.ORIENTATION, 0);
//設置圖像輸出位置
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent,1);
獲取返回的圖像路徑
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);
}
通過路徑加載Bitmap
Bitmap bitmap = BitmapFactory.decodeFile(getPathFromUri(this, uri));
二、利用Camrea拍照
1、調用Camera的open()打開相機
2、調用Camera的getParameters()獲取拍照參數。該方法返回一個Camera.Paremeters對象
3、調用Camera.Parameters對象方法設置拍照的參數
4、調用Camera.startPreview()方法開始預覽取景，在預覽取景之前需要調用Camera的setPreviewDisplay(SurfaceHolder
holder)方法設置使用哪個SurfaceView來顯示取景圖片。
5、調用Camera的takePicture()方法進行拍照
6、結束程序時，調用Camera的stopPreview()結束取景預覽，并調用release()方法釋放資源
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){
//第一個監聽器；當用戶按下快門時激發該監聽器
//第二個監聽器；當相機獲取原始照片時激發該監聽器
//第三個監聽器；當相機獲取JPG照片時激發該監聽器
mCamera.takePicture(new Camera.ShutterCallback() {
@Override
public void onShutter() {
//快門按下時
}
}, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
//此處代碼可以決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);
//創建矩陣 旋轉圖像
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);
//銷毀原圖
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) {
//添加自動聚焦
mCamera.autoFocus(autoFocusCallback);
// ? ? ? ? ? ? ? ? ? ?takePhoto();
}
}
});
}
private int mPreviewWidth=0;
private int mPreviewHeight=0;
/**
*初始化相機
*/private void initCamera() {
if(!isPreview){
//打開相機
// ? ? ? ? ? ?mCamera = Camera.open(Camera.getNumberOfCameras()-1);
mCamera = Camera.open(0);
}
if(mCamera!=null&&!isPreview){
//獲取相關設置
Camera.Parameters parameters = mCamera.getParameters();
List previewsizes = parameters.getSupportedPreviewSizes();
Iterator 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());
//設置預覽招聘時每秒顯示多少幀的最小值和最大值
// ? ? ? ? ? ?parameters.setPreviewFpsRange(10, 20);
//設置圖片格式
parameters.setPictureFormat(PixelFormat.JPEG);
//設置預覽大小
// ? ? ? ? ? ?parameters.setPreviewSize(mPreviewWidth, mPreviewHeight);
//設置照片大小
parameters.setPictureSize(mPreviewWidth, mPreviewHeight);
//設置JPG照片的質量
parameters.set("jpeg-quality", 100);
//設置取景的SutfaceView
try {
//設置顯示方向
mCamera.setDisplayOrientation(90);
mCamera.setParameters(parameters);
//設置配置
mCamera.setPreviewDisplay(mSurfaceHolder);
mCamera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
isPreview=true;
}
/**
*業務過程
*/private void process() {
mSurfaceHolder = mSurfaceView.getHolder();
//設置Surface不需要自己維護還沖區
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
/**
*初始化視圖
*/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);
}
}
錄像
一、使用系統Intent
Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
//限制時長s
intent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 5);
//限制大小
intent.putExtra(MediaStore.EXTRA_SIZE_LIMIT, 1024*1024);
//設置質量
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
//設置輸出位置
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();
//視頻地址
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){
//停止錄制
mRecorder.stop();
//釋放資源
mRecorder.release();
mRecorder=null;
}
}
});
}
private File file;
private MediaRecorder mRecorder;
/**
*開始錄制
*/private void startRecord() {
file = new File(Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".mp4");
try {
//創建MediaPay對象
mRecorder = new MediaRecorder();
mRecorder.reset();
//設置從麥克風采集聲音
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
//設置從攝像頭采集圖像
mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mRecorder.setOrientationHint(90);
//設置視頻文件輸出格式，這個設置必須在聲音編碼格式，圖像編碼格式之前設置
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
//設置聲音編碼格式、圖像編碼格式
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
//設置視頻大小
mRecorder.setVideoSize(1280, 960);
//設置幀率每秒32幀
mRecorder.setVideoFrameRate(32);
//設置編碼比特率
mRecorder.setVideoEncodingBitRate(5*1024*1024);
mRecorder.setOutputFile(file.getAbsolutePath());
//指定使用Surface來預覽視頻
mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
//準備
mRecorder.prepare();
//開始錄制
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);
}
}
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