public class SelectPicActivity extends Activity implements OnClickListener{

/***
* 使用照相机拍照获取图片
*/
public static final int SELECT_PIC_BY_TACK_PHOTO = 1;
/***
* 使用相册中的图片
*/
public static final int SELECT_PIC_BY_PICK_PHOTO = 2;

/***
* 从Intent获取图片路径的KEY
*/
public static final String KEY_PHOTO_PATH = "photo_path";

private static final String TAG = "SelectPicActivity";

private LinearLayout dialogLayout;
private Button takePhotoBtn,pickPhotoBtn,cancelBtn;

/**获取到的图片路径*/
private String picPath;

private Intent lastIntent ;

private Uri photoUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.select_pic_layout);
initView();
}
/**
* 初始化加载View
*/
private void initView() {
dialogLayout = (LinearLayout) findViewById(R.id.dialog_layout);
dialogLayout.setOnClickListener(this);
takePhotoBtn = (Button) findViewById(R.id.btn_take_photo);
takePhotoBtn.setOnClickListener(this);
pickPhotoBtn = (Button) findViewById(R.id.btn_pick_photo);
pickPhotoBtn.setOnClickListener(this);
cancelBtn = (Button) findViewById(R.id.btn_cancel);
cancelBtn.setOnClickListener(this);

lastIntent = getIntent();
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dialog_layout:
finish();
break;
case R.id.btn_take_photo:
takePhoto();
break;
case R.id.btn_pick_photo:
pickPhoto();
break;
default:
finish();
break;
}
}

/**
* 拍照获取图片
*/
private void takePhoto() {
//执行拍照前，应该先判断SD卡是否存在
String SDState = Environment.getExternalStorageState();
if(SDState.equals(Environment.MEDIA_MOUNTED))
{

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//"android.media.action.IMAGE_CAPTURE"
/***
* 需要说明一下，以下操作使用照相机拍照，拍照后的图片会存放在相册中的
* 这里使用的这种方式有一个好处就是获取的图片是拍照后的原图
* 如果不实用ContentValues存放照片路径的话，拍照后获取的图片为缩略图不清晰
*/
ContentValues values = new ContentValues(); 
photoUri = this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); 
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, photoUri);
/**-----------------*/
startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);
}else{
Toast.makeText(this,"内存卡不存在", Toast.LENGTH_LONG).show();
}
}

/***
* 从相册中取图片
*/
private void pickPhoto() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
finish();
return super.onTouchEvent(event);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(resultCode == Activity.RESULT_OK)
{
doPhoto(requestCode,data);
}
super.onActivityResult(requestCode, resultCode, data);
}

/**
* 选择图片后，获取图片的路径
* @param requestCode
* @param data
*/
private void doPhoto(int requestCode,Intent data)
{
if(requestCode == SELECT_PIC_BY_PICK_PHOTO ) //从相册取图片，有些手机有异常情况，请注意
{
if(data =http://www.mamicode.com/= null)
{
Toast.makeText(this, "选择图片文件出错", Toast.LENGTH_LONG).show();
return;
}
photoUri = data.getData();
if(photoUri == null )
{
Toast.makeText(this, "选择图片文件出错", Toast.LENGTH_LONG).show();
return;
}
}
String[] pojo = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(photoUri, pojo, null, null,null); 
if(cursor != null )
{
int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]);
cursor.moveToFirst();
picPath = cursor.getString(columnIndex);
cursor.close();
}
Log.i(TAG, "imagePath = "+picPath);
if(picPath != null && ( picPath.endsWith(".png") || picPath.endsWith(".PNG") ||picPath.endsWith(".jpg") ||picPath.endsWith(".JPG") ))
{
lastIntent.putExtra(KEY_PHOTO_PATH, picPath);
setResult(Activity.RESULT_OK, lastIntent);
finish();
}else{
Toast.makeText(this, "选择图片文件不正确", Toast.LENGTH_LONG).show();
}
}
}