Android 调用照相机拍照把照片转化为字节数组

转化为字节数组的方法有两种：

第一种：

  字节数组data保存Bitmap对象转为字节数组，处理代码:

BitmapFactory.decodeByteArray(data, 0, data.length);

第二种：

ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
data2 = baos.toByteArray();

这里其实很好理解，第二种方法使用了Bitmap的compress方法，一般用于保存一个Bitmap对象，转为字节输出流，但是compress目前编码由两种，比如JPG，一般处理照片和PNG，PNG一般处理带Alpha透明通道的图片，后面的第二个参数是清晰度，一般100是最高，0是最低，这个值越大图片越清晰，同时文件体积越大，JPG和PNG都是压缩的图片，所以和原始的直接通过BitmapFactory.decodeByteArray解码后的大小会有很大的不同。

 

android调用照相机拍照获取照片并做简单剪裁：

1.调用系统的照相机程序
Intent intent = newIntent(MediaStore.ACTION_IMAGE_CAPTURE);
 startActivityForResult(intent,TAKE_PHOTO_WITH_DATA);

2.在onActivityResult中处理返回的data
final Bitmap photo = data.getParcelableExtra("data");
如果不需要做剪切处理就可以直接使用图片了，比如输出到ImageView上
imageView.setImageBitmap(photo);
如果需要做剪切处理，就继续向下执行

3.做剪切处理
       Intentintent = newIntent("com.android.camera.action.CROP");
       intent.setType("image
   privateButton btnTake = null;
   privateImageView lblImage = null;
   
   privatestatic final int PHOTO_PICKED_WITH_DATA = 3021;
   privatestatic final int CAMERA_WITH_DATA = 3023;
   
   @Override
   public voidonCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       
       btnTake= (Button)findViewById(R.id.btnTake);
       lblImage= (ImageView)findViewById(R.id.lblImage);
       btnTake.setOnClickListener(newView.OnClickListener() {
           
           @Override
           publicvoid onClick(View v) {
               //TODO Auto-generated method stub
               Intentintent = newIntent(MediaStore.ACTION_IMAGE_CAPTURE);
               startActivityForResult(intent,CAMERA_WITH_DATA);
           }
       });
       
   }
   
   @Override
   protectedvoid onActivityResult(int requestCode, int resultCode,Intent data){
       //TODO Auto-generated method stub
       if(resultCode!=RESULT_OK)
           return;
       switch(requestCode){
       caseCAMERA_WITH_DATA:
           finalBitmap photo = data.getParcelableExtra("data");
           if(photo!=null){
               doCropPhoto(photo);
           }
       casePHOTO_PICKED_WITH_DATA:
           Bitmapphoto1 = data.getParcelableExtra("data");
           if(photo1!=null){
               lblImage.setImageBitmap(photo1);
           }
           
       }
   }
   
   protectedvoid doCropPhoto(Bitmap data){
       Intentintent = getCropImageIntent(data);
       startActivityForResult(intent,PHOTO_PICKED_WITH_DATA);
   }
   
   public staticIntent getCropImageIntent(Bitmap data) {
       Intentintent = newIntent("com.android.camera.action.CROP");
       intent.setType("image/*");
       intent.putExtra("data",data);
       intent.putExtra("crop","true");
       intent.putExtra("aspectX",1);
       intent.putExtra("aspectY",1);
       intent.putExtra("outputX",128);
       intent.putExtra("outputY",128);
       intent.putExtra("return-data",true);
       returnintent;
   }
}

 

 

完整代码：

package com.chc.android;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class tapgetcut extends Activity {
private Button btnTake = null;
private ImageView lblImage = null;

private static final int PHOTO_PICKED_WITH_DATA = 3021;
private static final int CAMERA_WITH_DATA = 3023;

@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   
    btnTake =(Button)findViewById(R.id.btn01);
    lblImage =(ImageView)findViewById(R.id.iv01);
   btnTake.setOnClickListener(new View.OnClickListener() {
      
       @Override
       public void onClick(View v) {
           // TODO Auto-generated method stub
           Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
           startActivityForResult(intent, CAMERA_WITH_DATA);
       }
    });
   
}

@Override
protected void onActivityResult(int requestCode, int resultCode,Intent data) {
    // TODOAuto-generated method stub
   if(resultCode!=RESULT_OK)
       return;
   switch(requestCode){
    caseCAMERA_WITH_DATA:
       final Bitmap photo = data.getParcelableExtra("data");
       if(photo!=null){
           doCropPhoto(photo);
       }
    casePHOTO_PICKED_WITH_DATA:
       Bitmap photo1 = data.getParcelableExtra("data");
       if(photo1!=null){
           lblImage.setImageBitmap(photo1);
       }
      
    }
}

protected void doCropPhoto(Bitmap data){
    Intentintent = getCropImageIntent(data);
   startActivityForResult(intent, PHOTO_PICKED_WITH_DATA);
}

public static Intent getCropImageIntent(Bitmap data) {
    Intentintent = new Intent("com.android.camera.action.CROP");
   intent.setType("image/*");
   intent.putExtra("data", data);
   intent.putExtra("crop", "true");
   intent.putExtra("aspectX", 1);
   intent.putExtra("aspectY", 1);
   intent.putExtra("outputX", 128);
   intent.putExtra("outputY", 128);
   intent.putExtra("return-data", true);
    returnintent;
}
}

xml：

<?xml version="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView
    android:id="@+id/test01"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<Button
   android:id="@+id/btn01"
    android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="确定"
   />
<ImageView android:id="@+id/iv01"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   ></ImageView>
</LinearLayout>

注：貌似这篇文章与题目不符，仔细看看这两个模块，是不是豁然开朗呢。