Android 拍照和相册选图 版本兼容

Android 拍照和相册选图 版本兼容

一.相机部分

    1. 调用启动系统相机

       

intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

startActivityForResult(intent, CAMERA_REQUEST_CODE);

       常量值可以自己定义（private static int CAMERA_REQUEST_CODE = 1）

    2.Activity中方法回调

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST_CODE) {
if (data == null) {
return;
} else { 
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap bm = extras.getParcelable("data");
Uri uri = saveBitmap(bm);
startImageZoom(uri);
}
}
}
}

     其中saveBitmap()方法如下：

private Uri saveBitmap(Bitmap bm) {

File tmpDir = new File(Environment.getExternalStorageDirectory()
+ "/test");
if (!tmpDir.exists()) {
tmpDir.mkdir();
}
File img = new File(tmpDir.getAbsolutePath() + "test.png");
try {
FileOutputStream fos = new FileOutputStream(img);
bm.compress(Bitmap.CompressFormat.PNG, 85, fos);
fos.flush();
fos.close();
Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
return Uri.fromFile(img);
} catch (FileNotFoundException e) {
Toast.makeText(MainActivity.this, "Failed", Toast.LENGTH_SHORT).show();
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Failed", Toast.LENGTH_SHORT).show();
return null;
}

}

    startImageZoom()方法如下：

private void startImageZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 150);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", true);
startActivityForResult(intent, CROP_REQUEST_CODE);
}

      其中输出比例和输出尺寸可以根据需要修改，常量值可以自己定义（private static int CROP_REQUEST_CODE = 3）

    3.最后当然是接受裁剪后的图片，并显示给控件了

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CROP_REQUEST_CODE) {
if (data == null) {
return;
}else{

Bundle extras = data.getExtras();

if (extras == null) {

return;

}

Bitmap bm = extras.getParcelable("data");

//TODO

这里当然是显示Bitmap 给图片控件了

}

}
}

二.相册部分

     1.调用启动系统相册

intent = new Intent(Intent.ACTION_GET_CONTENT);

intent.setType("image/*");

startActivityForResult(intent, GALLERY_REQUEST_CODE);

      常量可以自己定义（private static int GALLERY_REQUEST_CODE = 2）

    2.Activity回调

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == GALLERY_REQUEST_CODE) {
if (data == null) {
return;
}else{

Uri uri = data.getData();

Uri fileUri = convertUri(uri);

startImageZoom(fileUri);
}

} 
}

       其中convertUri()方法如下：

private Uri convertUri(Uri uri) {
InputStream is = null;
try {
is = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(is);
is.close();
return saveBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}

       其中startImageZoom()方法，上文已写

      3.获取裁剪后图片，并设置给图片控件

        与相机获取裁剪图片是一个方法

三. 请记得添加权限啊，很重要

     

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

It's Over,下边介绍2中兼容性问题解决方案（别人总结的，借过来用用）

     1.选择系统相册时HTC 7出现的系统崩溃（空指针异常） 系统版本 2.3.7

        通常从系统相册中选择图片写法如下：

albumButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

startActivityForResult(intent, AppContext.GETIMAGE_BYSDCARD);

}

});

      然后在onActivityResult中获取刚刚选取的照片：

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent intent) {

if (resultCode == RESULT_OK) {

if (requestCode == AppContext.GETIMAGE_BYSDCARD || requestCode == AppContext.GETIMAGE_BYCAMERA) {

if (requestCode == AppContext.GETIMAGE_BYSDCARD && null != data) {

Uri selectedImage = data.getData();

String[] filePathColumn = { MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);

 if (cursor != null) {

 if (cursor.moveToFirst()) {

//int columnIndex = cursor.getColumnIndex(filePathColumn[0]);

 int columnIndex = cursor.getColumnIndexOrThrow(filePathColumn[0]);

 photoPath = cursor.getString(columnIndex);

}

 cursor.close();

}

}

}

}

}

   可以在HTC7  2.3.7 上发现无法获取图片，如果上述代码中没有做cursor != null 则系统崩溃，最后定为出原因在于Uri selectedImage = data.getData();这行代码上，在其他手     机上，此处返回格式为content://media/external/images/media/244709，因此自然是通过接下来的Content Privider方式获取到图片实际地址。而在HTC此手机上，返回的结     果却为：/storage/sdcard0/DCIM/Camera/IMG_20140608_162447.jpg，即直接返回了所选取图片的地址，因此，需要针对性的做出如下处理：

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent intent) {

if (resultCode == RESULT_OK) {

if (requestCode == AppContext.GETIMAGE_BYSDCARD || requestCode == AppContext.GETIMAGE_BYCAMERA) {

if (requestCode == AppContext.GETIMAGE_BYSDCARD && null != data) {

Uri selectedImage = data.getData();

String[] filePathColumn = { MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);

if (cursor != null) {

 if (cursor.moveToFirst()) {

//int columnIndex = cursor.getColumnIndex(filePathColumn[0]);

 int columnIndex = cursor.getColumnIndexOrThrow(filePathColumn[0]);

 photoPath = cursor.getString(columnIndex);

}

cursor.close();

} else {

if (selectedImage != null) {

String tmpPath = selectedImage.getPath();

if (tmpPath != null && (tmpPath.endsWith(".jpg") || tmpPath.endsWith(".png") || tmpPath.endsWith(".gif"))) {

photoPath = tmpPath;

}

}

}

}

}

}

}

 2.三星手机调用手机拍照后出现横竖屏切换的问题

   其实这也是一个典型的问题了，当初也是在网上直接查到的解决方案，貌似是三星手机的通病。解决方案如下：

public static int getPictureDegree(String path) {

int degree = 0;

try {

ExifInterface exifInterface = new ExifInterface(path);

int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);

switch (orientation) {

case ExifInterface.ORIENTATION_ROTATE_90:

degree = 90;

break;

case ExifInterface.ORIENTATION_ROTATE_180:

degree = 180;

break;

case ExifInterface.ORIENTATION_ROTATE_270:

degree = 270;

break;

}

} catch (IOException e) {

e.printStackTrace();

}

return degree;

}

int degree = getPictureDegree(filePath);

return roateBitmap(thumbBitmap, degree);

public static Bitmap roateBitmap(Bitmap bitmap, int degree) {

if (degree == 0) {

return bitmap;

}

Matrix matrix = new Matrix();

matrix.postRotate(degree);

Bitmap bmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

return bmp;

}

主要思路其实就是通过图片Exif获取到其旋转角度，然后再相应旋转过来。

源码地址：https://github.com/FreetoflyBai/CameraManager