由于我剛?cè)肼毈F(xiàn)在的這家公司的時(shí)候，他們對(duì)涉及到圖片的比較多，所以打算寫一系列圖片的文章，首先就從制造圖片的地方開始寫起--Camera如果你的app里面只是需要拍一張照片，只需要調(diào)用系統(tǒng)的照相機(jī)就可以滿足你的需求了通過ACTION_IMAGE_CAPTURE調(diào)用系統(tǒng)的照相機(jī)
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
然后在通過startActivityForResult方法跳轉(zhuǎn)onActivityResult：
Bundle extras = data.getExtras();
Bitmap bitmap = (Bitmap) extras.get("data");
showImage.setImageBitmap(bitmap);
一般的情況下這樣就滿足了你的需求，也不需要增加權(quán)限，但是這里需要注意的是通過data獲得的是一張縮略圖，如果想獲得一張?jiān)瓐D，就需要指定圖片的保存地址
Uri uri = Uri.fromFile(new File(path)); intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT,uri);
同樣使用startActivityForResult方法跳轉(zhuǎn)onActivityResult：
FileInputStream fileInputStream = null;
Bitmap output;
try {
int degree = PhotoUtil.readPictureDegree(path);
fileInputStream = new FileInputStream(new File(path));
output = BitmapFactory.decodeStream(fileInputStream);
showImage.setImageBitmap(
PhotoUtil.rotaingImageView(degree,output));
} catch (FileNotFoundException e) {
e.printStackTrace();
}finally {
if (fileInputStream != null){
try { fileInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
其實(shí)拿到這個(gè)需要一下兩句話就能拿到這個(gè)bitmap
fileInputStream = new FileInputStream(new File(path));
output = BitmapFactory.decodeStream(fileInputStream);
但是保存在本地的圖片，直接這樣取得的照片旋轉(zhuǎn)了90度，其中圖片的旋轉(zhuǎn)角度是記錄在exif中的，所以為了把圖片旋轉(zhuǎn)過來，索性直接利用exif去取角度
public static int readPictureDegree(String path) {
int degree = 0;
try {
ExifInterface exifInterface = new ExifInterface(path);
int orientation = exifInterface.getAttributeInt( ExifInterface.TAG_ORIENTATION,ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return degree;
}
然后根據(jù)取到的角度旋轉(zhuǎn)bitmap
public static Bitmap rotaingImageView(int angle , Bitmap bitmap) {
Matrix matrix = new Matrix();
matrix.postRotate(angle);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
return resizedBitmap;
}
對(duì)于圖片的操作后面再說這樣就能實(shí)現(xiàn)獲得原圖，并且能夠正向的顯示圖片，但是很多app不只是拍一張照片而已，所以下面開始介紹自定義Camera
public class CameraView extends SurfaceView implements SurfaceHolder.Callback {
private Camera camera;
private SurfaceHolder holder;
private Context context;
private String picUrl;
public CameraView(Context context) {
super(context);
this.context = context;
initHolder();
}
public CameraView(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
initHolder();
}
public CameraView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
initHolder();
}
private void initHolder() {
holder = this.getHolder(); holder.addCallback(this);
}
private boolean existCamera(Context context) {
return context.getPackageManager().
hasSystemFeature(PackageManager.FEATURE_CAMERA);
}
private void initCamera() {
if (camera == null) {
camera = Camera.open();
}
}
private void imagePreview(SurfaceHolder holder) {
try {
if (camera != null) {
camera.setPreviewDisplay(holder);
camera.setDisplayOrientation(90);
camera.startPreview();
}
} catch (IOException e) {
e.printStackTrace();
}
}
private void setParameters() {
if (camera != null) {
Camera.Parameters parameters =
camera.getParameters();
parameters.setPictureFormat(ImageFormat.JPEG);
parameters.setRotation(90);
parameters.setFlashMode(
Camera.Parameters.FLASH_MODE_AUTO);
camera.setParameters(parameters);
}
}
private void releaseCamera() {
if (camera != null) {
camera.setPreviewCallback(null);
camera.stopPreview();
camera.release();
camera = null;
}
}
public void autoFocus(){
if (camera != null){
camera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (success){
takePicture();
}
}
}); }
}
public void takePicture(){
if (camera != null){
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
if (picUrl == null) {
picUrl = Environment.getExternalStorageDirectory() + File.separator + "zimo.jpg";
}
File file = new File(picUrl);
if (file.exists()) {
file.delete();
}
try {
FileOutputStream fos = new FileOutputStream(file);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
imagePreview(holder);
}
});
}}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (existCamera(context)){
initCamera();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
setParameters();
imagePreview(holder);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
releaseCamera();
}
public void setPicUrl(String picUrl) {
this.picUrl = picUrl;
}
上面是一個(gè)自定義的Camera，繼承了SurfaceView 1. 檢查Camera是否存在 2. 初始化Camera 3. 設(shè)置參數(shù) 4. 預(yù)覽圖片 5. 拍照 6. 釋放Camera這就是自定義Camera實(shí)現(xiàn)的步驟了，當(dāng)然還有增加權(quán)限
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
只要把CameraView當(dāng)成自定義控件使用就好
<com.zimo.guo.customcamera.view.CameraView
android:id="@+id/camera"
android:layout_width="match_parent"
android:layout_height="match_parent" />
點(diǎn)擊拍照按鈕直接調(diào)用takePicture()，當(dāng)然也可以自己定義圖片地址
cameraView.setPicUrl(path);
cameraView.takePicture();
還可以實(shí)現(xiàn)聚焦之后自動(dòng)拍照
cameraView.autoFocus();
下篇開始研究圖片了，這篇就先到這！
