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   源码介绍

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package com.example.systemcamera;

import java.io.BufferedOutputStream;  
import java.io.File;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.util.Calendar;  
import java.util.Locale;  
  
import android.app.Activity;  
import android.content.Intent;  
import android.graphics.Bitmap;  
import android.os.Bundle;  
import android.os.Environment;  
import android.provider.MediaStore;  
import android.text.format.DateFormat;  
import android.util.Log;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.ImageView;  
import android.widget.Toast;  
  
public class MainActivity extends Activity {  
    /** Called when the activity is first created. */  
    private Button button;  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        button = (Button) findViewById(R.id.button1);  
        button.setOnClickListener(new OnClickListener() {  
  
            @Override  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
  
                startActivityForResult(intent, 1);  
            }  
        });  
    }  
  
    @Override  
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
        // TODO Auto-generated method stub  
        super.onActivityResult(requestCode, resultCode, data);  
        if (resultCode == Activity.RESULT_OK) {  
            String sdStatus = Environment.getExternalStorageState();  
            if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用  
                Log.i("TestFile",  
                        "SD card is not avaiable/writeable right now.");  
                return;  
            }  
            String name = new DateFormat().format("yyyyMMdd_hhmmss",Calendar.getInstance(Locale.CHINA))   ".jpg";     
            Toast.makeText(this, name, Toast.LENGTH_LONG).show();  
            Bundle bundle = data.getExtras();  
            Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式  
          
            FileOutputStream b = null;  
           //???????????????????????????????为什么不能直接保存在系统相册位置呢？？？？？？？？？？？？  
            File file = new File("/sdcard/myImage/");  
            file.mkdirs();// 创建文件夹  
            String fileName = "/sdcard/myImage/" name;  
  
            try {  
                b = new FileOutputStream(fileName);  
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件  
            } catch (FileNotFoundException e) {  
                e.printStackTrace();  
            } finally {  
                try {  
                    b.flush();  
                    b.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
            ((ImageView) findViewById(R.id.imageView1)).setImageBitmap(bitmap);// 将图片显示在ImageView里  
        }  
    }  
}