Andriod Camra的简单使用

在AndroidMainfest.xml中要添加各种权限，并且取消硬件加速

package cn.com.xiebiao.mytest;

import android.app.Activity;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.widget.ImageView;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

public class MainActivity extends Activity{
    private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
    private ImageView imageView;
    Uri uri;
    File myfile;
    File dir;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView=(ImageView)this.findViewById(R.id.imageView);
        //获取外部存储卡的路径，并且将图片保存为my.jpg
        dir=Environment.getExternalStorageDirectory();
        myfile=new File(dir,"my.jpg");

        //将文件路径转为uri传给intent
        uri=Uri.fromFile(myfile);
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        //通知照相机保存照片到uri
        intent.putExtra(MediaStore.EXTRA_OUTPUT,uri);
        startActivityForResult(intent,CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       if(requestCode==CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE && resultCode==RESULT_OK) {
           try {
               //读取存储卡中的图片在imageView中显示出来
               InputStream inputStream=new FileInputStream(myfile);
               byte[] buffer=new byte[inputStream.available()];
               inputStream.read(buffer);
               imageView.setImageBitmap(BitmapFactory.decodeByteArray(buffer,0,buffer.length));
           } catch (FileNotFoundException e) {
               e.printStackTrace();
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
    }
}