Android开发之 选择相册图片或者拍照

在我们的Android开发中肯定都会遇到要选择本地相册的图片或者是用相机进行拍照使用图片。

简单的讲解一下如何使用，比如我们要上传头像时总会使用的。这个步骤一般就是：1.点击头像然后会弹出一个菜单，然后我们选择是从相册中选择图片还是使用相机拍照；2.选择照片或者拍照以后保存后照片的Id。基本就是这个样子比较简单的功能

public class MainActivity extends Activity {    private static final int PHOTO_REQUEST_CAMERA = 1;// 拍照    private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择    private static final int PHOTO_REQUEST_CUT = 3;// 结果    private ImageView mFace;    private Bitmap bitmap;    /* 头像名称 */    private static final String PHOTO_FILE_NAME = "temp_photo.jpg";    private File tempFile;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        this.mFace = (ImageView) this.findViewById(R.id.iv_image);    }    /*     * 从相册获取     */    public void gallery(View view) {        // 激活系统图库，选择一张图片        Intent intent = new Intent(Intent.ACTION_PICK);        intent.setType("image/*");        this.startActivityForResult(intent, PHOTO_REQUEST_GALLERY);    }    /*     * 从相机获取     */    public void camera(View view) {        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");        // 判断存储卡是否可以用，可用进行存储        if (hasSdcard()) {            intent.putExtra(MediaStore.EXTRA_OUTPUT,                    Uri.fromFile(new File(Environment                            .getExternalStorageDirectory(), PHOTO_FILE_NAME)));        }        this.startActivityForResult(intent, PHOTO_REQUEST_CAMERA);    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == PHOTO_REQUEST_GALLERY) {            if (data != null) {                // 得到图片的全路径                Uri uri = data.getData();                crop(uri);            }        } else if (requestCode == PHOTO_REQUEST_CAMERA) {            if (hasSdcard()) {                tempFile = new File(Environment.getExternalStorageDirectory(),                        PHOTO_FILE_NAME);                crop(Uri.fromFile(tempFile));            } else {                Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！", 0).show();            }        } else if (requestCode == PHOTO_REQUEST_CUT) {            try {                bitmap = data.getParcelableExtra("data");                this.mFace.setImageBitmap(bitmap);                boolean delete = tempFile.delete();                System.out.println("delete = " + delete);            } catch (Exception e) {                e.printStackTrace();            }        }        super.onActivityResult(requestCode, resultCode, data);    }    /**     * 剪切图片     *      * @function:     * @author:Jerry     * @date:2013-12-30     * @param uri     */    private void crop(Uri uri) {        // 裁剪图片意图        Intent intent = new Intent("com.android.camera.action.CROP");        intent.setDataAndType(uri, "image/*");        intent.putExtra("crop", "true");        // 裁剪框的比例，1：1        intent.putExtra("aspectX", 1);        intent.putExtra("aspectY", 1);        // 裁剪后输出图片的尺寸大小        intent.putExtra("outputX", 250);        intent.putExtra("outputY", 250);        // 图片格式        intent.putExtra("outputFormat", "JPEG");        intent.putExtra("noFaceDetection", true);// 取消人脸识别        intent.putExtra("return-data", true);// true:不返回uri，false：返回uri        startActivityForResult(intent, PHOTO_REQUEST_CUT);    }    //判断是否有Sd card    private boolean hasSdcard() {        if (Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED)) {            return true;        } else {            return false;        }    }

布局文件：

<LinearLayout 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:orientation="vertical"    tools:context=".MainActivity" >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="gallery"        android:text="获取图库图片" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="camera"        android:text="拍照获取图片" />    <ImageView        android:id="@+id/iv_image"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <Button        android:onClick="upload"                android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="上传" /></LinearLayout>