Android学习（15）-摄像头和相册

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如何调用自己手机的拍照功能以及从手机相册选择图片？比如找个小例子：

首先，还是弄一个layout先：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ImageView        android:id="@+id/picture"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/take_photo"        android:layout_alignRight="@+id/choose_from_album"        android:layout_below="@+id/choose_from_album"        android:layout_marginTop="55dp"        android:src="@drawable/ic_launcher" />    <Button        android:id="@+id/choose_from_album"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/take_photo"        android:layout_alignBottom="@+id/take_photo"        android:layout_alignParentRight="true"        android:layout_marginRight="28dp"        android:text="从相册选择图片" />    <Button        android:id="@+id/take_photo"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginLeft="14dp"        android:layout_marginTop="23dp"        android:text="拍照" /></RelativeLayout>

对于该活动，其代码：

public class MainActivity extends Activity {public static final int TAKE_PHOTO = 1;public static final int CROP_PHOTO = 2; //裁剪图片//用于拍照private Button takePhoto;private ImageView picture;private Uri imageUri; //选择图片private Button chooseFromAlbum;@Overrideprotected 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.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {//创建File对象，用于存储拍照后的图片File outputImage = new File(Environment.getExternalStorageDirectory(),"tempImage.jpg");//参数： 目录  文件try {if(outputImage.exists()){ //文件已经存在就删除outputImage.delete();}outputImage.createNewFile();} catch (IOException e) {e.printStackTrace();}imageUri = Uri.fromFile(outputImage);//获取图片路径Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");//用于启动拍照服务intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);//传递数据startActivityForResult(intent, TAKE_PHOTO);//启动拍照服务，而且需要返回结果，返回数据由onActivityResult处理}});chooseFromAlbum = (Button)findViewById(R.id.choose_from_album);chooseFromAlbum.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {//创建File文件，用于存储选择的照片File outputImage = new File(Environment.getExternalStorageDirectory(),"output_image.jpg");try {if(outputImage.exists()){outputImage.delete();}outputImage.createNewFile();} catch (IOException e) {e.printStackTrace();}imageUri = Uri.fromFile(outputImage); //打开相册Intent intent = new Intent("android.intent.action.GET_CONTENT");//启动从相册选择图片功能intent.setType("image/*");intent.putExtra("crop", true);intent.putExtra("scale", true);intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);startActivityForResult(intent, CROP_PHOTO);}});}//用于响应调用活动返回protected void onActivityResult(int requestCode, int resultCode, Intent data){switch (requestCode) {case TAKE_PHOTO:if(resultCode == RESULT_OK){//如果当前只是拍照，调用裁剪活动Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(imageUri, "image/*");intent.putExtra("scale", true);intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);startActivityForResult(intent, CROP_PHOTO);//启动剪裁活动}break;case CROP_PHOTO:if(resultCode == RESULT_OK){try {Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri)); //跨程序共享数据，共享输入数据picture.setImageBitmap(bitmap);} catch (FileNotFoundException e) {e.printStackTrace();}}break;default:break;}}}

在配置文件中要配置权限说明：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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