android上传图片及下载图片并显示

1、项目需要打开摄像头，拍照，然后上传照片。

首先定义一个“拍照”按钮，用来跳转到另一个Activity：

[java] protected void takePhoto() {
        // TODO Auto-generated method stub

        String sdStatus = Environment.getExternalStorageState();
        if (!sdStatus.equals(Environment.MEDIA_MOUNTED))
        { // 检测sd是否可用
            Log.i("exception",
                    "SD card is not avaiable/writeable right now.");
            Toast.makeText(getApplicationContext(), "sd卡无法使用",
                     Toast.LENGTH_SHORT).show();
            return;
        }

          File file = new File(
                Environment.getExternalStorageDirectory().getAbsolutePath()
                +File.separator+"myAQ"+File.separator);
        if(!file.exists())
            file.mkdirs();// 创建文件夹

        String time = new SimpleDateFormat(
                "yyyyMMddHHmmss").format(new Date());
        fileName = time+".jpg";
        Intent intent = new Intent(PublishNewsActivity.this,TakePhotoActivity.class);
        intent.putExtra("fileName", fileName);
        startActivityForResult(intent, 10);

    }

protected void takePhoto() {
  // TODO Auto-generated method stub

  String sdStatus = Environment.getExternalStorageState();
        if (!sdStatus.equals(Environment.MEDIA_MOUNTED))
        { // 检测sd是否可用
            Log.i("exception",
                    "SD card is not avaiable/writeable right now.");
            Toast.makeText(getApplicationContext(), "sd卡无法使用",
         Toast.LENGTH_SHORT).show();
            return;
        }

          File file = new File(
          Environment.getExternalStorageDirectory().getAbsolutePath()
    +File.separator+"myAQ"+File.separator);
        if(!file.exists())
        file.mkdirs();// 创建文件夹

  String time = new SimpleDateFormat(
    "yyyyMMddHHmmss").format(new Date());
  fileName = time+".jpg";
  Intent intent = new Intent(PublishNewsActivity.this,TakePhotoActivity.class);
  intent.putExtra("fileName", fileName);
  startActivityForResult(intent, 10);

}在拍照的Activity会打开摄像头，点击拍照按钮可以拍照并返回上一个Activity。

[java] import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.Bitmap.CompressFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class TakePhotoActivity extends Activity {

    private SurfaceView mSurfaceView;
    private SurfaceHolder mHolder;
    protected Camera camera;
    private Button start;
    private String photoName;
    private int window_width;
    private int window_height;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Window window = getWindow();
        requestWindowFeature(Window.FEATURE_NO_TITLE);//没有标题
        window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置全屏
        getWindow().setFormat(PixelFormat.TRANSLUCENT);//设置半透明
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//设置高亮
        setCo

补充：移动开发 , Android ,