android 拍照并保存

2022-06-11 13:44:59

引用：http://blog.sina.com.cn/s/blog_821e2bb10101475x.html

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
       Intent intent = newIntent("com.android.camera.action.CROP");
       intent.setType("image
   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.btnTake);
       lblImage = (ImageView)findViewById(R.id.lblImage);
       btnTake.setOnClickListener(new View.OnClickListener() {

           @Override
           public void onClick(View v) {
               // TODO Auto-generated method stub
               Intent intent = newIntent(MediaStore.ACTION_IMAGE_CAPTURE);
               startActivityForResult(intent, CAMERA_WITH_DATA);
           }
       });

   }

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

       }
   }

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

   public static Intent getCropImageIntent(Bitmap data) {
       Intent intent = 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);
       return intent;
   }
}

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) {
    // TODO Auto-generated method stub
    if(resultCode!=RESULT_OK)
        return;
    switch(requestCode){
    case CAMERA_WITH_DATA:
        final Bitmap photo = data.getParcelableExtra("data");
        if(photo!=null){
            doCropPhoto(photo);
        }
    case PHOTO_PICKED_WITH_DATA:
        Bitmap photo1 = data.getParcelableExtra("data");
        if(photo1!=null){
            lblImage.setImageBitmap(photo1);
        }

    }
}

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

public static Intent getCropImageIntent(Bitmap data) {
    Intent intent = 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);
    return intent;
}
}

xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns: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

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