封装好的Potoutil工具类，调用拍照、相册以及对图片做处理

平时写项目总会遇到上传图片，都有写调用相机相册，很烦很累，所以这里封装好了 只需调用此类，就可以实现相机相册，并且返回图像对其做处理，可以返回bitmap 或者转成String去上传服务器。

PhotoUtil.CAMRA_SETRESULT_CODE：相册返回

PhotoUtil.PHOTO_SETRESULT_CODE：拍照返回

photoUtil.getCameraPath(Intent data):获取相册图片路径

photoUtil.getPhotoPath():获取拍照后图片路径

photoUtil.readBitmapAutoSize(String path);将图片转换成bitmap

photoUtil.bitmaptoString(bitmap);将bitmap转换成字符串

DeMO下载地址 http://download.csdn.net/detail/u012303938/9005323

MainActivity调用PhoUtil

package com.example.photodemo;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends ActionBarActivity {
private Button btn;
private ImageView img;
private PhotoUtil photoUtil;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button) findViewById(R.id.btn);
img=(ImageView) findViewById(R.id.img);
btn.setOnClickListener(new  OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
photoUtil=new PhotoUtil(MainActivity.this);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);

//相册返回
if(PhotoUtil.CAMRA_SETRESULT_CODE==requestCode){
if(resultCode==RESULT_OK) {
//相册选中图片路径
String cameraPath = photoUtil.getCameraPath(data);
Bitmap bitmap = photoUtil.readBitmapAutoSize(cameraPath);
img.setImageBitmap(bitmap);
String str=photoUtil.bitmaptoString(bitmap);
}
}
//相机返回
else if(PhotoUtil.PHOTO_SETRESULT_CODE==requestCode){
if(resultCode==RESULT_OK){
String photoPath=photoUtil.getPhotoPath();
Bitmap bitmap=photoUtil.readBitmapAutoSize(photoPath);
String str=photoUtil.bitmaptoString(bitmap);
img.setImageBitmap(bitmap);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

封装好的PhtoUtil

package com.example.photodemo;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.StateListDrawable;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Base64;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

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

/**
* Created by CarrayDraw on 2015/8/12.
*/
public class PhotoUtil {
//相册，拍照，取消
private TextView camera,photo,back;
private AlertDialog dialog;
private Context context;
// 创建一个以当前时间为名称的文件
public static final int CAMRA_SETRESULT_CODE=0;//相册返回码
public static final int PHOTO_SETRESULT_CODE=1;//拍照返回码
public PhotoUtil(Context context) {
this.context=context;
if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
View view=initView();
dialog=new AlertDialog.Builder(context).setTitle("图片来源").setView(view).create();
dialog.show();
addListener();

}else{
Toast.makeText(context,"请插入内存卡",Toast.LENGTH_SHORT).show();
}
}
//设置点击背景
private StateListDrawable getBackGroundColor() {
Drawable press=new ColorDrawable(0xffd7d7d7);
Drawable normal=new ColorDrawable(0xffffffff);
StateListDrawable drawable = new StateListDrawable();
drawable.addState(new int[]{android.R.attr.state_pressed}, press);
drawable.addState(new int[]{-android.R.attr.state_pressed},normal);
return  drawable;
}

private void addListener() {
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
((Activity) context).startActivityForResult(intent, CAMRA_SETRESULT_CODE);
dialog.dismiss();

}
});
photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(getPhotoPath())));
((Activity) context).startActivityForResult(intent, PHOTO_SETRESULT_CODE);
dialog.dismiss();

}
});
}

@SuppressLint("NewApi") private View  initView() {
LinearLayout layout=new LinearLayout(context);
LinearLayout.LayoutParams params=new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
layout.setLayoutParams(params);
layout.setOrientation(LinearLayout.VERTICAL);
layout.setBackgroundColor(0xffffffff);
camera=new TextView(context);
LinearLayout.LayoutParams textViewParams=new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
camera.setLayoutParams(textViewParams);
camera.setPadding(20, 20, 0, 20);
camera.setText("相册");
camera.setTextSize(20);
camera.setBackground(getBackGroundColor());
TextView blod1=new TextView(context);
LinearLayout.LayoutParams blodViewParams=new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,1);
blod1.setLayoutParams(blodViewParams);
blod1.setBackgroundColor(0xffd7d7d7);
TextView blod2=new TextView(context);
blod2.setLayoutParams(blodViewParams);
blod2.setBackgroundColor(0xffd7d7d7);
photo=new TextView(context);
LinearLayout.LayoutParams photoParams=new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
photo.setLayoutParams(photoParams);
photo.setPadding(20, 20, 0, 20);
photo.setText("拍照");
photo.setBackground(getBackGroundColor());
photo.setTextSize(20);
back=new TextView(context);
LinearLayout.LayoutParams backParams=new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
back.setLayoutParams(backParams);
back.setGravity(Gravity.CENTER);
back.setPadding(0, 25, 0, 25);
back.setText("取消");
back.setTextSize(14);
back.setBackground(getBackGroundColor());
layout.addView(camera);
layout.addView(blod1);
layout.addView(photo);
layout.addView(blod2);
layout.addView(back);
return  layout;
}

// 拍照使用系统当前日期加以调整作为照片的名称
private static String getPhotoFileName() {
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");
return dateFormat.format(date) + ".jpg";
}
//拍照路径
public String getPhotoPath(){
File file=new File(Environment.getExternalStorageDirectory(),"/imgs");
if(!file.exists()){
file.mkdirs();
}
String path=file.getPath()+"photo.jpg";
return path;
}
//file转换成BitMap
public static Bitmap readBitmapAutoSize(String filePath) {
// outWidth和outHeight是目标图片的最大宽度和高度，用作限制
Bitmap bm = null;
try {

BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inJustDecodeBounds = true;
// 设置只是解码图片的边距，此操作目的是度量图片的实际宽度和高度
BitmapFactory.decodeFile(filePath, opt);
opt.inDither = false;
opt.inPreferredConfig = Bitmap.Config.RGB_565;

// 设置加载图片的颜色数为16bit，默认是RGB_8888，表示24bit颜色和透明通道，但一般用不上
// opt.inSampleSize = 1;
opt.inSampleSize = computeSampleSize(opt, -1, 900 * 900);
opt.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(filePath, opt);
} catch (Exception e) {
e.printStackTrace();
}
return bm;
}
public static int computeSampleSize(BitmapFactory.Options options,
int minSideLength, int maxNumOfPixels) {
int initialSize = computeInitialSampleSize(options, minSideLength,
maxNumOfPixels);
int roundedSize;
if (initialSize <= 8) {
roundedSize = 1;
while (roundedSize < initialSize) {
roundedSize <<= 1;
}
} else {
roundedSize = (initialSize + 7) / 8 * 8;
}
return roundedSize;
}
private static int computeInitialSampleSize(BitmapFactory.Options options,
int minSideLength, int maxNumOfPixels) {
double w = options.outWidth;
double h = options.outHeight;
int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math
.sqrt(w * h / maxNumOfPixels));
int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(
Math.floor(w / minSideLength), Math.floor(h / minSideLength));
if (upperBound < lowerBound) {
return lowerBound;
}
if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
return 1;
} else if (minSideLength == -1) {
return lowerBound;
} else {
return upperBound;
}
}
//bitmap转换成字节流
public static String bitmaptoString(Bitmap bitmap) {
// 将Bitmap转换成字符串
String result = "";
ByteArrayOutputStream bStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bStream);
byte[] bytes = bStream.toByteArray();
byte[] bb = Base64.encode(bytes,Base64.DEFAULT);
try {
result = new String(bb, "UTF-8").replace("+", "%2B");
} catch (IOException e) {
e.printStackTrace();
} finally {
}
return result;
}
//得到相册路径
public String getCameraPath(Intent data){
Uri originalUri = data.getData();
String[] proj = {MediaStore.Images.Media.DATA};

//好像是android多媒体数据库的封装接口，具体的看Android文档

Cursor cursor = ((Activity)context).managedQuery(originalUri, proj, null, null, null);

//按我个人理解 这个是获得用户选择的图片的索引值

int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

//将光标移至开头 ，这个很重要，不小心很容易引起越界

cursor.moveToFirst();

//最后根据索引值获取图片路径

String path = cursor.getString(column_index);
return path;
}

}