Android实现拍照功能实例

一、main.xml布局文件

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"> 
    <ImageView android:id="@+id/imageView" 
        android:adjustViewBounds="true"
        android:layout_gravity="center"
        android:minWidth="150dip" 
        android:minHeight="150dip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/> 
    <Button android:id="@+id/btnPhone" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:text="相册" /> 
    <Button android:id="@+id/btnTakePicture" 
        android:layout_height="wrap_content"
        android:layout_width="fill_parent" 
        android:text="拍照" /> 
</LinearLayout>

二、核心代码

package com.ljq.test;

import java.io.ByteArrayOutputStream;
import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class TestActivity extends Activity {
    private static final int NONE = 0;
    private static final int PHOTO_GRAPH = 1;// 拍照
    private static final int PHOTO_ZOOM = 2; // 缩放
    private static final int PHOTO_RESOULT = 3;// 结果
    private static final String IMAGE_UNSPECIFIED = "image/*";
    private ImageView imageView = null;
    private Button btnPhone = null;
    private Button btnTakePicture = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        imageView = (ImageView) findViewById(R.id.imageView);
        btnPhone = (Button) findViewById(R.id.btnPhone);
        btnPhone.setOnClickListener(onClickListener);
        btnTakePicture = (Button) findViewById(R.id.btnTakePicture);
        btnTakePicture.setOnClickListener(onClickListener);
    }
    
    private final View.OnClickListener onClickListener = new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if(v==btnPhone){ //从相册获取图片
                Intent intent = new Intent(Intent.ACTION_PICK, null);
                intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_UNSPECIFIED);
                startActivityForResult(intent, PHOTO_ZOOM);
            }else if(v==btnTakePicture){ //从拍照获取图片
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment
                    .getExternalStorageDirectory(),"temp.jpg")));
                startActivityForResult(intent, PHOTO_GRAPH);
            }

        }

    };

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == NONE)
            return;
        // 拍照
        if (requestCode == PHOTO_GRAPH) {
            // 设置文件保存路径
            File picture = new File(Environment.getExternalStorageDirectory()
                    + "/temp.jpg");
            startPhotoZoom(Uri.fromFile(picture));
        }

        if (data == null)
            return;

        // 读取相册缩放图片
        if (requestCode == PHOTO_ZOOM) {
            startPhotoZoom(data.getData());
        }
        // 处理结果
        if (requestCode == PHOTO_RESOULT) {
            Bundle extras = data.getExtras();
            if (extras != null) {
                Bitmap photo = extras.getParcelable("data");
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);// (0-100)压缩文件
                //此处可以把Bitmap保存到sd卡中，具体请看：http://www.cnblogs.com/linjiqin/archive/2011/12/28/2304940.html
                imageView.setImageBitmap(photo); //把图片显示在ImageView控件上
            }

        }

        super.onActivityResult(requestCode, resultCode, data);
    }

    /**
     * 收缩图片
     * 
     * @param uri
     */
    public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, IMAGE_UNSPECIFIED);
        intent.putExtra("crop", "true");
        // aspectX aspectY 是宽高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高
        intent.putExtra("outputX", 300);
        intent.putExtra("outputY", 500);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, PHOTO_RESOULT);
    }

}

很简单的一个实例，如果需要实现更多自定义的功能，请看上篇文档。

Android Camera 使用小结