【移動應(yīng)用開發(fā)技術(shù)】Android中怎么調(diào)用Camera

【移動應(yīng)用開發(fā)技術(shù)】Android中怎么調(diào)用Camera

Android中怎么調(diào)用Camera，相信很多沒有經(jīng)驗的人對此束手無策，為此本文總結(jié)了問題出現(xiàn)的原因和解決方法，通過這篇文章希望你能解決這個問題。首先是布局文件，線性布局，左邊兩個按鈕垂直擺放，右邊預(yù)覽圖以及照相獲取到的圖：<?xml

version="1.0"

encoding="utf-8"?>

<LinearLayout

xmlns:android="/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal"

>

<LinearLayout

android:layout_width="200dip"

android:layout_height="150dip"

android:orientation="vertical"

>

<Button

android:id="@+id/btn1"

android:layout_width="80dip"

android:layout_height="50dip"

android:text="Start

takPic"

/>

<Button

android:id="@+id/btn2"

android:layout_width="80dip"

android:layout_height="50dip"

android:text="Get

Pic"

/>

</LinearLayout>

<LinearLayout

android:id="@+id/cameraView"

android:layout_width="200dip"

android:layout_height="150dip"

android:orientation="vertical"

>

</LinearLayout>

</LinearLayout>代碼，都寫在一起的。包含一個自定義的surfaceView（用于相機(jī)的照相預(yù)覽）.以及activit：package

com.nico;

import

java.io.ByteArrayInputStream;

import

java.io.IOException;

import

android.app.Activity;

import

android.content.Context;

import

android.graphics.PixelFormat;

import

android.graphics.drawable.BitmapDrawable;

import

android.graphics.drawable.Drawable;

import

android.hardware.Camera;

import

android.os.Bundle;

import

android.os.Environment;

import

android.util.Log;

import

android.view.SurfaceHolder;

import

android.view.SurfaceView;

import

android.view.View;

import

android.view.Window;

import

android.view.WindowManager;

import

android.view.View.OnClickListener;

import

android.widget.Button;

import

android.widget.LinearLayout;

public

class

Test

extends

Activity

implements

OnClickListener

{

/**

Called

when

the

activity

is

first

created.

*/

//

camera

類

private

Camera

camera

=

null;

//

繼承surfaceView的自定義view

用于存放照相的圖片

private

CameraView

cv

=

null;

//

回調(diào)用的picture，實現(xiàn)里邊的onPictureTaken方法，其中byte[]數(shù)組即為照相后獲取到的圖片信息

private

Camera.PictureCallback

picture

=

new

Camera.PictureCallback()

{

@Override

public

void

onPictureTaken(byte[]

data,

Camera

camera)

{

//

主要就是將圖片轉(zhuǎn)化成drawable，設(shè)置為固定區(qū)域的背景（展示圖片），當(dāng)然也可以直接在布局文件里放一個surfaceView供使用。

ByteArrayInputStream

bais

=

new

ByteArrayInputStream(data);

Drawable

d

=

BitmapDrawable.createFromStream(bais,

Environment

.getExternalStorageDirectory().getAbsolutePath()

+

"/img.jpeg");

l.setBackgroundDrawable(d);

try

{

}

catch

(Exception

e)

{

e.printStackTrace();

}

}

};

//

按鈕

布局等定義，不作贅述

Button

btn1

=

null;

Button

btn2

=

null;

LinearLayout

l

=

null;

@Override

public

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

getWindow().setFormat(PixelFormat.TRANSLUCENT);

setContentView(R.layout.main);

l

=

(LinearLayout)

findViewById(R.id.cameraView);

btn1

=

(Button)

findViewById(R.id.btn1);

btn2

=

(Button)

findViewById(R.id.btn2);

btn1.setOnClickListener(this);

btn2.setOnClickListener(this);

}

//主要的surfaceView，負(fù)責(zé)展示預(yù)覽圖片，camera的開關(guān)

class

CameraView

extends

SurfaceView

{

//

private

SurfaceHolder

holder

=

null;

public

CameraView(Context

context)

{

super(context);

holder

=

this.getHolder();

holder.addCallback(new

SurfaceHolder.Callback()

{

@Override

public

void

surfaceChanged(SurfaceHolder

holder,

int

format,

int

width,

int

height)

{

Camera.Parameters

parameters

=

camera.getParameters();

//以下注釋掉的是設(shè)置預(yù)覽時的圖像以及拍照的一些參數(shù)

//

parameters.setPictureFormat(PixelFormat.JPEG);

//

parameters.setPreviewSize(parameters.getPictureSize().width,

//

parameters.getPictureSize().height);

//

parameters.setFocusMode("auto");

//

parameters.setPictureSize(width,

height);

camera.setParameters(parameters);

camera.startPreview();

}

@Override

public

void

surfaceCreated(SurfaceHolder

holder)

{

camera

=

Camera.open();

try

{

//設(shè)置camera預(yù)覽的角度，因為默認(rèn)圖片是傾斜90度的

camera.setDisplayOrientation(90);

//設(shè)置holder主要是用于surfaceView的圖片的實時預(yù)覽，以及獲取圖片等功能，可以理解為控制camera的操作..

camera.setPreviewDisplay(holder);

}

catch

(IOException

e)

{

camera.release();

camera

=

null;

e.printStackTrace();

}

}

@Override

public

void

surfaceDestroyed(SurfaceHolder

holder)

{

//顧名思義可以看懂

camera.stopPreview();

camera.release();

camera

=

null;

}

});

//

holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

}

@Override

public

void

onClick(View

v)

{

if

(v

==

btn1)

{

l.removeAllViews();

cv

=

new

CameraView(Test.this);

LinearLayout.LayoutParams

params

=

new

LinearLayout.LayoutParams(

LinearLayout.LayoutParams.FILL_PARENT,

LinearLayout.LayoutParams.FILL_PARENT);

l.addView(cv,

params);

}

else

if

(v

==

btn2)

{

camera.takePicture(null,

null,

picture);

}

}

}package

com.nico;

import

java.io.ByteArrayInputStream;

import

java.io.IOException;

import

android.app.Activity;

import

android.content.Context;

import

android.graphics.PixelFormat;

import

android.graphics.drawable.BitmapDrawable;

import

android.graphics.drawable.Drawable;

import

android.hardware.Camera;

import

android.os.Bundle;

import

android.os.Environment;

import

android.util.Log;

import

android.view.SurfaceHolder;

import

android.view.SurfaceView;

import

android.view.View;

import

android.view.Window;

import

android.view.WindowManager;

import

android.view.View.OnClickListener;

import

android.widget.Button;

import

android.widget.LinearLayout;

public

class

Test

extends

Activity

implements

OnClickListener

{

/**

Called

when

the

activity

is

first

created.

*/

//

camera

類

private

Camera

camera

=

null;

//

繼承surfaceView的自定義view

用于存放照相的圖片

private

CameraView

cv

=

null;

//

回調(diào)用的picture，實現(xiàn)里邊的onPictureTaken方法，其中byte[]數(shù)組即為照相后獲取到的圖片信息

private

Camera.PictureCallback

picture

=

new

Camera.PictureCallback()

{

@Override

public

void

onPictureTaken(byte[]

data,

Camera

camera)

{

//

主要就是將圖片轉(zhuǎn)化成drawable，設(shè)置為固定區(qū)域的背景（展示圖片），當(dāng)然也可以直接在布局文件里放一個surfaceView供使用。

ByteArrayInputStream

bais

=

new

ByteArrayInputStream(data);

Drawable

d

=

BitmapDrawable.createFromStream(bais,

Environment

.getExternalStorageDirectory().getAbsolutePath()

+

"/img.jpeg");

l.setBackgroundDrawable(d);

try

{

}

catch

(Exception

e)

{

e.printStackTrace();

}

}

};

//

按鈕

布局等定義，不作贅述

Button

btn1

=

null;

Button

btn2

=

null;

LinearLayout

l

=

null;

@Override

public

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

getWindow().setFormat(PixelFormat.TRANSLUCENT);

setContentView(R.layout.main);

l

=

(LinearLayout)

findViewById(R.id.cameraView);

btn1

=

(Button)

findViewById(R.id.btn1);

btn2

=

(Button)

findViewById(R.id.btn2);

btn1.setOnClickListener(this);

btn2.setOnClickListener(this);

}

//主要的surfaceView，負(fù)責(zé)展示預(yù)覽圖片，camera的開關(guān)

class

CameraView

extends

SurfaceView

{

//

private

SurfaceHolder

holder

=

null;

public

CameraView(Context

context)

{

super(context);

holder

=

this.getHolder();

holder.addCallback(new

SurfaceHolder.Callback()

{

@Override

public

void

surfaceChanged(SurfaceHolder

holder,

int

format,

int

width,

int

height)

{

Camera.Parameters

parameters

=

camera.getParameters();

//以下注釋掉的是設(shè)置預(yù)覽時的圖像以及拍照的一些參數(shù)

//

parameters.setPictureFormat(PixelFormat.JPEG);

//

parameters.setPreviewSize(parameters.getPictureSize().width,

//

parameters.getPictureSize().height);

//

parameters.setFocusMode("auto");

//

parameters.setPictureSize(width,

height);

camera.setParameters(parameters);

camera.startPreview();

}

@Override

public

void

surfaceCreated(SurfaceHolder

holder)

{

camera

=

Camera.open();

try

{

//設(shè)置camera預(yù)覽的角度，因為默認(rèn)圖片是傾斜90度的

camera.setDisplayOrientation(90);

//設(shè)置holder主要是用于surfaceView的圖片的實時預(yù)覽，以及獲取圖片等功能，可以理解為控制camera的操作..

camera