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Android调用系统相机和相册

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拍照和相册的功能在实际开发中是最常见的功能，这里记录下。

准备工作

权限

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<!-- 往SDCard写入数据权限 --> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<!--请求访问使用照相设备-->
<uses-permission android:name="android.permission.CAMERA" />

常量

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public final static int ALBUM_REQUEST_CODE = 1;
public final static int CROP_REQUEST = 2;
public final static int CAMERA_REQUEST_CODE = 3;
public static String SAVED_IMAGE_DIR_PATH = 
Environment.getExternalStorageDirectory().getPath() 
+ "/AppName/camera/";// 拍照路径
String cameraPath;

相机

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// 指定相机拍摄照片保存地址
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
    cameraPath = SAVED_IMAGE_DIR_PATH + System.currentTimeMillis() + ".png";
    Intent intent = new Intent();
    // 指定开启系统相机的Action
    intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
    String out_file_path = SAVED_IMAGE_DIR_PATH;
    File dir = new File(out_file_path);
    if (!dir.exists()) {
        dir.mkdirs();
    } // 把文件地址转换成Uri格式
    Uri uri = Uri.fromFile(new File(cameraPath));
    // 设置系统相机拍摄照片完成后图片文件的存放地址
    intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
    startActivityForResult(intent, CAMERA_REQUEST_CODE);
} else {
    Toast.makeText(getApplicationContext(), "请确认已经插入SD卡",
            Toast.LENGTH_LONG).show();
}

onActivityResult
拿到cameraPath，就随便你搞了。

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@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK) {
        if (requestCode == CAMERA_REQUEST_CODE) {
            LogUtil.d("path=" + cameraPath);
        }
 }

不需要自定义路径，默认为Environment.DIRECTORY_PICTURES

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/**
    * 启动相机
    */
   public static String startCamera(Activity activity, int requestCode) {
       // 指定相机拍摄照片保存地址
       String state = Environment.getExternalStorageState();
       if (state.equals(Environment.MEDIA_MOUNTED)) {
           Intent intent = new Intent();
           // 指定开启系统相机的Action
           intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
           File outDir = Environment
		.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
           if (!outDir.exists()) {
               outDir.mkdirs();
           }
           File outFile = new File(outDir, System.currentTimeMillis() + ".jpg");
           // 把文件地址转换成Uri格式
           Uri uri = Uri.fromFile(outFile);
           LogUtil.d("getAbsolutePath=" + outFile.getAbsolutePath());
           // 设置系统相机拍摄照片完成后图片文件的存放地址
           intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
           // 此值在最低质量最小文件尺寸时是0，在最高质量最大文件尺寸时是１
           intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
           activity.startActivityForResult(intent, requestCode);
           return outFile.getAbsolutePath();
       } else {
           Toast.makeText(activity, "请确认已经插入SD卡",
                   Toast.LENGTH_LONG).show();
           return null;
       }
   }

相册

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Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, ALBUM_REQUEST_CODE);

onActivityResult
调用系统相册，然后通过Uri拿到图片的绝对地址。

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@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
       if (resultCode == Activity.RESULT_OK) {
           if (requestCode == AppConstants.ALBUM_REQUEST_CODE) {
               try {
                   Uri uri = data.getData();
                   final String absolutePath= getAbsolutePath(mActivity, uri);
                   LogUtil.d("path=" + absolutePath);
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       }
   }

getAbsolutePath方法

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public String getAbsolutePath(final Context context, final Uri uri) {
    if (null == uri) return null;
    final String scheme = uri.getScheme();
    String data = null;
    if (scheme == null)
        data = uri.getPath();
    else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
        data = uri.getPath();
    } else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
        Cursor cursor = context.getContentResolver().query(uri, 
	 new String[]{MediaStore.Images.ImageColumns.DATA}, null, null, null);
        if (null != cursor) {
            if (cursor.moveToFirst()) {
                int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
                if (index > -1) {
                    data = cursor.getString(index);
                }
            }
            cursor.close();
        }
    }
    return data;
}