拍照（二）得到全尺寸图片，并进行压缩

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:id="@+id/take_photo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Take Photo" />

<Button
android:id="@+id/get_photo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="get Photo" />

<ImageView
android:id="@+id/picture"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_gravity="center_horizontal" />

</LinearLayout>

package com.example.choosepictest;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements OnClickListener {

static final int REQUEST_IMAGE_CAPTURE = 1;

private Button takePhoto;
private Button getPhoto;
private ImageView picture;
private Uri imgUri;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
takePhoto = (Button) findViewById(R.id.take_photo);
getPhoto = (Button) findViewById(R.id.get_photo);
picture = (ImageView) findViewById(R.id.picture);
takePhoto.setOnClickListener(this);
getPhoto.setOnClickListener(this);

}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.take_photo:
dispatchTakePictureIntent();
break;

default:
break;
}

}

// 保存全尺寸照片
String mCurrentPhotoPath;
private void dispatchTakePictureIntent() {

File appDir = new File(Environment.getExternalStorageDirectory(),
"/etoury/picCache");
if (!appDir.exists()) {
appDir.mkdirs();
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
String fileName = timeStamp + ".jpg";

File outputImage = new File(appDir, fileName);
try {
if (outputImage.exists()) {
outputImage.delete();
}
outputImage.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
mCurrentPhotoPath = outputImage.getAbsolutePath();
imgUri = Uri.fromFile(outputImage);
// 意图 相机
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);
// 如果有相机
if (intent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}
}

//解码缩放图片(Decode a Scaled Image)
private void setPic() {
// Get the dimensions of the View
int targetW = picture.getWidth();
int targetH = picture.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
// 该 值设为true那么将不返回实际的bitmap，也不给其分配内存空间这样就避免内存溢出了。但是允许我们查询图片的信息这其中就包括图片大小信息
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
// Math.min求最小值
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
// 设置恰当的inSampleSize可以使BitmapFactory分配更少的空间以消除该错误
bmOptions.inSampleSize = scaleFactor;
// 如果inPurgeable设为True的话表示使用BitmapFactory创建的Bitmap,用于存储Pixel的内存空间在系统内存不足时可以被回收
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
picture.setImageBitmap(bitmap);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
switch (requestCode) {

case REQUEST_IMAGE_CAPTURE:
galleryAddPic();
setPic();
break;

default:
break;
}
}
}
//发送一条通知添加照片到相册
private void galleryAddPic() {

Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

mediaScanIntent.setData(imgUri);
this.sendBroadcast(mediaScanIntent);
}

}