android camera根据屏幕图像大小设置显示

package com.example.camera;



import java.io.File;



import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.text.format.Time;

import android.util.Log;

import android.view.Display;

import android.widget.ImageView;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;





public class MainActivity extends Activity {



    private final static String TAG="camera";

    private final static int CAMERA_RESULT =0;

    private ImageView view;

    private String imageFilePath;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        //得到当前系统时间

        Time t=new Time();

        t.setToNow();

        int year=t.year;

        int month=t.month;

        int day=t.monthDay;

        int hour=t.hour;

        int minute=t.minute;

        int second=t.second;

        Log.i(TAG, ""+year+month+day+hour+minute+second);

        String filename=""+year+month+day+hour+minute+second;

        //得到SD卡的路径也设置文件名

        //这里可以简化的写成imageFilePath=Uri.parse("file:////sdcard/my.jpg");

        /*imageFilePath=Environment.getExternalStorageDirectory()

                .getAbsolutePath()+"/my01.jpg";*/

        imageFilePath=Environment.getExternalStorageDirectory()

                .getAbsolutePath()+"/"+filename+".jpg";

        //创建文件

        File file=new File(imageFilePath);

        //格式化为Uri

        Uri fileImageFilePath=Uri.fromFile(file);

        view=(ImageView)findViewById(R.id.imageview);

        Intent i=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);//启动intent

        //设置到意图中

        i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, fileImageFilePath);

        startActivityForResult(i, CAMERA_RESULT);

    }

    //返回接收

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        // TODO Auto-generated method stub

        super.onActivityResult(requestCode, resultCode, data);

        if(resultCode==RESULT_OK){

            //以1/8加载原图像的大小

            /*BitmapFactory.Options options=new BitmapFactory.Options();

            options.inSampleSize=8;

            Bitmap bitmap=BitmapFactory.decodeFile(imageFilePath, options);*/

            

            

            /*Bundle bundle=data.getExtras();

            Bitmap bitmap=(Bitmap) bundle.get("data");*/

            

            

//            view.setImageBitmap(bitmap);

            

            //得到图像的大小和显示的大小，动态解压

            Display display=getWindowManager().getDefaultDisplay();

            int dw=display.getWidth();

            int dh=display.getHeight();

            

            //加载图像

            BitmapFactory.Options options=new BitmapFactory.Options();

            options.inJustDecodeBounds=true;//设置之后可以设置长宽

            Bitmap bitmap=BitmapFactory.decodeFile(imageFilePath, options);

            

            int heightRatio=(int)Math.ceil(options.outHeight/(float)dh);

            int widthRatio=(int)Math.ceil(options.outWidth/(float)dw);

            

            Log.i(TAG, "heith:"+heightRatio);

            Log.i(TAG,"width:"+widthRatio);

            //判断长宽哪个大

            if(heightRatio>1 && widthRatio>1){

                if(heightRatio>widthRatio){

                    options.inSampleSize=heightRatio;

                }else{

                    options.inSampleSize=widthRatio;

                }

            }

            //对它进行真正的解码

            options.inJustDecodeBounds=false;

            bitmap=BitmapFactory.decodeFile(imageFilePath, options);

            view.setImageBitmap(bitmap);

            

            

            

        }

    }



  



}