实现Android中更换头像功能

本文转载自:http://blog.csdn.net/melodev/article/details/51477369

写在前面：

更换头像这个功能在用户界面几乎是100%出现的。通过拍摄照片或者调用图库中的图片，并且进行剪裁，来进行头像的设置。

功能相关截图如下：

用户界面，头像未设置

点击头像，弹出Dialog

选择照片，进行剪裁

头像设置成功

下面我们直接看看完整吧：


public class UserActivity extends BaseActivity implements OnClickListener {private ImageView iv_photo;private Bitmap head;// 头像Bitmapprivate static String path = "/sdcard/myHead/";// sd路径@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);initView();initListener();}private void initView() {setContentView(R.layout.activity_user);iv_photo = (ImageView) findViewById(R.id.iv_photo);Bitmap bt = BitmapFactory.decodeFile(path + "head.jpg");// 从SD卡中找头像，转换成Bitmapif (bt != null) {@SuppressWarnings("deprecation")Drawable drawable = new BitmapDrawable(bt);// 转换成drawableiv_photo.setImageDrawable(drawable);} else {/*** 如果SD里面没有则需要从服务器取头像，取回来的头像再保存在SD中* */}}private void initListener() {iv_photo.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.iv_photo:// 更换头像showTypeDialog();break;}}private void showTypeDialog() {AlertDialog.Builder builder = new AlertDialog.Builder(this);final AlertDialog dialog = builder.create();View view = View.inflate(this, R.layout.dialog_select_photo, null);TextView tv_select_gallery = (TextView) view.findViewById(R.id.tv_select_gallery);TextView tv_select_camera = (TextView) view.findViewById(R.id.tv_select_camera);tv_select_gallery.setOnClickListener(new OnClickListener() {// 在相册中选取@Overridepublic void onClick(View v) {Intent intent1 = new Intent(Intent.ACTION_PICK, null);intent1.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");startActivityForResult(intent1, 1);dialog.dismiss();}});tv_select_camera.setOnClickListener(new OnClickListener() {// 调用照相机@Overridepublic void onClick(View v) {Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);intent2.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "head.jpg")));startActivityForResult(intent2, 2);// 采用ForResult打开dialog.dismiss();}});dialog.setView(view);dialog.show();}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {switch (requestCode) {case 1:if (resultCode == RESULT_OK) {cropPhoto(data.getData());// 裁剪图片}break;case 2:if (resultCode == RESULT_OK) {File temp = new File(Environment.getExternalStorageDirectory() + "/head.jpg");cropPhoto(Uri.fromFile(temp));// 裁剪图片}break;case 3:if (data != null) {Bundle extras = data.getExtras();head = extras.getParcelable("data");if (head != null) {/*** 上传服务器代码*/setPicToView(head);// 保存在SD卡中iv_photo.setImageBitmap(head);// 用ImageView显示出来}}break;default:break;}super.onActivityResult(requestCode, resultCode, data);}/*** 调用系统的裁剪功能* * @param uri*/public void cropPhoto(Uri uri) {Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");intent.putExtra("crop", "true");// aspectX aspectY 是宽高的比例intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);// outputX outputY 是裁剪图片宽高intent.putExtra("outputX", 150);intent.putExtra("outputY", 150);intent.putExtra("return-data", true);startActivityForResult(intent, 3);}private void setPicToView(Bitmap mBitmap) {String sdStatus = Environment.getExternalStorageState();if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用return;}FileOutputStream b = null;File file = new File(path);file.mkdirs();// 创建文件夹String fileName = path + "head.jpg";// 图片名字try {b = new FileOutputStream(fileName);mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件} catch (FileNotFoundException e) {e.printStackTrace();} finally {try {// 关闭流b.flush();b.close();} catch (IOException e) {e.printStackTrace();}}}
}