android自定义Camera拍照并查看图片

2024-02-17 16:40:03 46

本文实例为大家分享了android自定义Camera拍照并查看图片的具体代码，供大家参考，具体内容如下

1、打开相机

a.预览拍摄图片，需用到SurfaceView，并且实现其回调函数implementsSurfaceHolder.Callback；
activity_camera.xml

2、获取相机并开启预览

/**
*获取系统相机
*
*@return
*/
privateCameragetcCamera(){
Cameracamera=null;
try{
camera=Camera.open();
}catch(Exceptione){
camera=null;
}
returncamera;
}

/**
*显示相机预览图片
*
*@return
*/
privatevoidshowCameraView(Cameracamera,SurfaceHolderholder)
{
try{
camera.setPreviewDisplay(holder);
camera.setDisplayOrientation(90);
camera.startPreview();
}catch(Exceptione){
e.printStackTrace();
};

}

/**
**实现界面回调处理
*/
@Override
publicvoidsurfaceCreated(SurfaceHolderholder){
showCameraView(mCamera,holder);
}

@Override
publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight){
mCamera.stopPreview();
showCameraView(mCamera,holder);
}

@Override
publicvoidsurfaceDestroyed(SurfaceHolderholder){
clearCamera();
}
}

3、相机主页面处理

publicclassCameraActivityextendsAppCompatActivityimplementsSurfaceHolder.Callback{

privateSurfaceViewsv;
privateCameramCamera;
privateSurfaceHolderholder;

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
sv=(SurfaceView)findViewById(R.id.sv);
holder=sv.getHolder();
holder.addCallback(this);

findViewById(R.id.btn_camera).setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
//获取当前相机参数
Camera.Parametersparameters=mCamera.getParameters();
//设置相片格式
parameters.setPictureFormat(ImageFormat.JPEG);
//设置预览大小
parameters.setPreviewSize(800,480);
//设置对焦方式，这里设置自动对焦
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.autoFocus(newCamera.AutoFocusCallback(){

@Override
publicvoidonAutoFocus(booleansuccess,Cameracamera){
//判断是否对焦成功
if(success){
//拍照第三个参数为拍照回调
mCamera.takePicture(null,null,newCamera.PictureCallback(){
@Override
publicvoidonPictureTaken(byte[]data,Cameracamera){
//data为完整数据
Filefile=newFile("/sdcard/photo.png");
//使用流进行读写
try{
FileOutputStreamfos=newFileOutputStream(file);
try{
fos.write(data);
//关闭流
fos.close();
//查看图片
Intentintent=newIntent();
//传递路径
intent.putExtra("path",file.getAbsolutePath());
setResult(0,intent);
finish();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}catch(FileNotFoundExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
});
}
}
});
}
});

}

@Override
protectedvoidonResume(){
super.onResume();
if(mCamera==null){
mCamera=getCamera();
if(holder!=null){
showCameraView(mCamera,holder);
}
}
}
@Override
protectedvoidonPause(){
//TODOAuto-generatedmethodstub
super.onPause();
//activity暂停时我们释放相机内存
clearCamera();

}
@Override
protectedvoidonDestroy(){
super.onDestroy();
}

/**
*释放相机的内存
*/
privatevoidclearCamera(){

//释放hold资源
if(mCamera!=null){
//停止预览
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
//释放相机资源
mCamera.release();
mCamera=null;
}
}

4、启动activity（设置拍照完图片路径返回显示图片处理，一定要对图片进行采样率操作（很可能拍照的图片太多而无法显示，又不报任何异常））

publicclassMainActivityextendsAppCompatActivity{

privateImageViewcameraIv;

@Override
protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata){
if(resultCode==0&&requestCode==100)
{
Stringpath=data.getStringExtra("path");
BitmapFactory.Optionsoptions=newBitmapFactory.Options();
options.inJustDecodeBounds=true;
BitmapFactory.decodeFile(path,options);
ImageSizeimageSize=getImageViewSize(cameraIv);
options.inSampleSize=caculateInSampleSize(options,
imageSize.width,imageSize.height);

//使用获得到的InSampleSize再次解析图片
options.inJustDecodeBounds=false;
Bitmapbitmap=BitmapFactory.decodeFile(path,options);
cameraIv.setImageBitmap(bitmap);
}

super.onActivityResult(requestCode,resultCode,data);
}

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ButtonopenButton=(Button)findViewById(R.id.button);
cameraIv=(ImageView)findViewById(R.id.imageView);



openButton.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
Intentintent=newIntent(MainActivity.this,CameraActivity.class);
startActivityForResult(intent,100);
}
});
}

/*根据需求的宽和高以及图片实际的宽和高计算SampleSize
*
*@paramoptions
*@paramwidth
*@paramheight
*@return
*/
publicstaticintcaculateInSampleSize(BitmapFactory.Optionsoptions,intreqWidth,
intreqHeight)
{
intwidth=options.outWidth;
intheight=options.outHeight;

intinSampleSize=1;

if(width>reqWidth||height>reqHeight)
{
intwidthRadio=Math.round(width*1.0f/reqWidth);
intheightRadio=Math.round(height*1.0f/reqHeight);

inSampleSize=Math.max(widthRadio,heightRadio);
}

returninSampleSize;
}

publicstaticImageSizegetImageViewSize(ImageViewimageView)
{

ImageSizeimageSize=newImageSize();
DisplayMetricsdisplayMetrics=imageView.getContext().getResources()
.getDisplayMetrics();

LinearLayout.LayoutParamslp=(LinearLayout.LayoutParams)imageView.getLayoutParams();

intwidth=imageView.getWidth();//获取imageview的实际宽度
if(width<=0)
{
width=lp.width;//获取imageview在layout中声明的宽度
}

if(width<=0)
{
width=displayMetrics.widthPixels;
}

intheight=imageView.getHeight();//获取imageview的实际高度
if(height<=0)
{
height=lp.height;//获取imageview在layout中声明的宽度
}

if(height<=0)
{
height=displayMetrics.heightPixels;
}
imageSize.width=width;
imageSize.height=height;

returnimageSize;
}

publicstaticclassImageSize
{
intwidth;
intheight;
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

android自定义Camera拍照并查看图片

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