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。

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