Android - 第一行代码 调用摄像头

package org.quentin.choosepictest;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
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;

/*
 * 经过测试，发现这些代码在公司的测试机上跑起来是没有问题的。但是在自己的5.1手机测试结果是不正常的。
 * 这可真是奇怪啊。学习一本书的时候，还是有一个比较稳定的版本比较好。当入门以后在通过自己查找文档，获得新特性
 * 在真正的项目开发中才可能事半功倍
 */

public class MainActivity extends Activity {

    public static final int TAKE_PHOTO = 1;
    public static final int CROP_PHOTO = 2;
    
    private Button takePhoto;
    private ImageView picture;
    private Uri imageUri; // - 
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        takePhoto = (Button)findViewById(R.id.take_photo);
        picture = (ImageView)findViewById(R.id.picture);
//        takePhoto.setText("Hello Thoto");
        takePhoto.setOnClickListener(new OnClickListener() {            
            @Override
            public void onClick(View v) {
                 //TODO Auto-generated method stub
                File outputImage = new File(Environment.getExternalStorageDirectory(),"tempImage.jpg");
                try{
                    if(outputImage.exists()){
                        outputImage.delete();                        
                    }
                    outputImage.createNewFile();
                }catch(IOException e){
                    e.printStackTrace();
                }
                
                imageUri = Uri.fromFile(outputImage);
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, TAKE_PHOTO);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        switch(requestCode){
        case TAKE_PHOTO:
            if(resultCode == RESULT_OK){
                Intent intent = new Intent("com.android.camera.action.CROP");
                intent.setDataAndType(imageUri, "image/*");
                intent.putExtra("scale", 1);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, CROP_PHOTO);
            }
            break;
        case CROP_PHOTO:
            if(resultCode == RESULT_OK){
                try{
                    Bitmap bitmap = BitmapFactory.decodeStream(
                            getContentResolver().openInputStream(imageUri)
                            );
                    picture.setImageBitmap(bitmap);
                }catch(FileNotFoundException e){
                    e.printStackTrace();
                }
            }
            break;
        default:
            break;
        }
        
    }
    @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);
    }
}