Android自定义相机实现自动对焦和手动对焦
Android自定义相机实现自动对焦和手动对焦：
不调用系统相机，因为不同的机器打开相机呈现的界面不统一也不能满足需求。
所以为了让程序在不同的机器上呈现出统一的界面，并且可以根据需求进行布局，做了此demo。
程序实现代码如下：
importjava.io.File;
importjava.io.FileNotFoundException;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.lang.reflect.Method;
importandroid.graphics.PixelFormat;
importandroid.hardware.Camera;
importandroid.hardware.Camera.AutoFocusCallback;
importandroid.hardware.Camera.Parameters;
importandroid.hardware.Camera.PictureCallback;
importandroid.hardware.Camera.ShutterCallback;
importandroid.os.Build;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.SurfaceHolder;
importandroid.view.SurfaceView;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importcom.hp.classes.config.Constants;
importcom.hp.classes.tools.CommonUtils;
importcom.hp.classes.ui.BaseActivity;
@SuppressWarnings("deprecation")
publicclassPhotographActivityextendsBaseActivityimplementsOnClickListener,SurfaceHolder.Callback{
privateSurfaceViewsurfaceView;
privateCameracamera;
privateCamera.Parametersparameters;
privateButtonbtn_goback,btn_takephoto;
privateSurfaceHoldersurfaceHolder;
@Override
protectedvoidonDestroy(){
super.onDestroy();
if(camera!=null){
camera.stopPreview();
camera.release();
camera=null;
}
}
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.classes_activity_takephoto);
initView();
}
@Override
protectedvoidonResume(){
super.onResume();
initCamera();
}
privatevoidinitView(){
btn_goback=(Button)findViewById(R.id.btn_goback);
btn_goback.setOnClickListener(this);
btn_takephoto=(Button)findViewById(R.id.btn_takephoto);
btn_takephoto.setOnClickListener(this);
surfaceView=(SurfaceView)findViewById(R.id.surfaceView);
surfaceView.setFocusable(true);
surfaceView.setOnClickListener(this);
surfaceView.setBackgroundColor(TRIM_MEMORY_BACKGROUND);
surfaceHolder=surfaceView.getHolder();
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceHolder.setKeepScreenOn(true);
surfaceHolder.setFixedSize(400,300);
surfaceHolder.addCallback(this);
}
@Override
publicvoidsurfaceDestroyed(SurfaceHolderholder){
//TODOAuto-generatedmethodstub
camera.stopPreview();
camera.release();
camera=null;
}
@Override
publicvoidsurfaceCreated(SurfaceHolderholder){
//TODOAuto-generatedmethodstub
try{
camera.setPreviewDisplay(surfaceHolder);
}catch(IOExceptione){
e.printStackTrace();
}
}
@Override
publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight){
//实现自动对焦
camera.autoFocus(newAutoFocusCallback(){
@Override
publicvoidonAutoFocus(booleansuccess,Cameracamera){
if(success){
camera.cancelAutoFocus();//只有加上了这一句，才会自动对焦
doAutoFocus();
}
}
});
}
//相机参数的初始化设置
privatevoidinitCamera(){
if(null==camera){
camera=Camera.open();
}
parameters=camera.getParameters();
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
if(!Build.MODEL.equals("KORIDYH30")){
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);//1连续对焦
}else{
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
}
camera.setParameters(parameters);
setDispaly(camera);
camera.startPreview();
camera.cancelAutoFocus();//2如果要实现连续的自动对焦，这一句必须加上
}
//控制图像的正确显示方向
privatevoidsetDispaly(Cameracamera){
if(Integer.parseInt(Build.VERSION.SDK)>=8){
setDisplayOrientation(camera,-90);
}else{
parameters.setRotation(-90);
}
}
//实现的图像的正确显示
privatevoidsetDisplayOrientation(Cameracamera,inti){
MethoddownPolymorphic;
try{
downPolymorphic=camera.getClass().getMethod("setDisplayOrientation",newClass[]{int.class});
if(downPolymorphic!=null){
downPolymorphic.invoke(camera,newObject[]{i});
}
}catch(Exceptione){
Log.e("Came_e","图像出错");
}
}
@Override
publicvoidonClick(Viewv){
switch(v.getId()){
caseR.id.surfaceView:
doAutoFocus();
break;
caseR.id.btn_takephoto:
takePicture();
break;
caseR.id.btn_goback:
finish();
break;
default:
break;
}
}
//handlebuttonautofocus
privatevoiddoAutoFocus(){
parameters=camera.getParameters();
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
camera.setParameters(parameters);
camera.autoFocus(newAutoFocusCallback(){
@Override
publicvoidonAutoFocus(booleansuccess,Cameracamera){
if(success){
camera.cancelAutoFocus();//只有加上了这一句，才会自动对焦。
if(!Build.MODEL.equals("KORIDYH30")){
parameters=camera.getParameters();
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);//1连续对焦
camera.setParameters(parameters);
}else{
parameters=camera.getParameters();
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
camera.setParameters(parameters);
}
}
}
});
}
privatevoidtakePicture(){
camera.takePicture(shutterCallback,rawCallback,jpegCallback);
}
//defineshutterCallback
ShutterCallbackshutterCallback=newShutterCallback(){
publicvoidonShutter(){
//TODODosomethingwhentheshuttercloses.
}
};
PictureCallbackrawCallback=newPictureCallback(){
publicvoidonPictureTaken(byte[]data,Cameracamera){
//TODODosomethingwiththeimageRAWdata.
}
};
//stroethepictureinformatjpeg
PictureCallbackjpegCallback=newPictureCallback(){
publicvoidonPictureTaken(byte[]data,Cameracamera){
//SavetheimageJPEGdatatotheSDcard
FileOutputStreamoutStream=null;
try{
//修改图片路径和名称
StringtempFilename=String.valueOf(System.currentTimeMillis())+".jpg";
Filefolder=Constants.CACHE_FOLDER;
if(!folder.isDirectory()){
folder.mkdirs();
}
Stringpath=Constants.CACHE_FOLDER+File.separator+tempFilename;
outStream=newFileOutputStream(path);
outStream.write(data);
outStream.flush();
outStream.close();
surfaceView.setBackgroundDrawable(newBitmapDrawable(BitmapFactory.decodeByteArray(data,0,data.length)));
}catch(FileNotFoundExceptione){
Log.e("TAG","FileNoteFound",e);
}catch(IOExceptione){
Log.e("TAG","IOException",e);
}
}
};
}
classes_activity_takephoto.xml代码如下：
<?xmlversion="1.0"encoding="utf-8"?> <RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <SurfaceView android:id="@+id/surfaceView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:layout_toLeftOf="@+id/rlright"/> <LinearLayout android:id="@+id/rlright" android:layout_width="40dp" android:layout_height="match_parent" android:layout_alignParentRight="true" android:background="#2b2b2b" android:gravity="center_horizontal" android:orientation="vertical"> <LinearLayout android:layout_width="wrap_content" android:layout_height="0dip" android:layout_weight="1" android:gravity="center"> <Button android:id="@+id/btn_goback" style="@style/PETextButton" android:text="返回"/> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="0dip" android:layout_weight="1" android:gravity="center"> <Button android:id="@+id/btn_takephoto" style="@style/PETextButton" android:text="拍照"/> </LinearLayout> </LinearLayout> </RelativeLayout>
在清单文件需要添加相应权限：
<uses-permissionandroid:name="android.permission.CAMERA"/> <uses-featureandroid:name="android.hardware.camera"/> <uses-featureandroid:name="android.hardware.camera.autofocus"/>
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。