Android手机拍照或选取图库图片作为头像

package zhangpgil.photo;
 
import java.io.File;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
 
public class MainActivity extends ActionBarActivity {
 
  /* 头像文件 */
  private static final String IMAGE_FILE_NAME = "temp_head_image.jpg";
 
  /* 请求识别码 */
  private static final int CODE_GALLERY_REQUEST = 0xa0;
  private static final int CODE_CAMERA_REQUEST = 0xa1;
  private static final int CODE_RESULT_REQUEST = 0xa2;
 
  // 裁剪后图片的宽(X)和高(Y),480 X 480的正方形。（生成bitmap貌似有时要报错？可试下把大小弄小点）
  private static int output_X = 480;
  private static int output_Y = 480;
 
  private ImageView headImage = null;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 
    headImage = (ImageView) findViewById(R.id.imageView);
 
    Button buttonLocal = (Button) findViewById(R.id.buttonLocal);
    buttonLocal.setOnClickListener(new View.OnClickListener() {
 
      @Override
      public void onClick(View v) {
        choseHeadImageFromGallery();
      }
    });
 
    Button buttonCamera = (Button) findViewById(R.id.buttonCamera);
    buttonCamera.setOnClickListener(new View.OnClickListener() {
 
      @Override
      public void onClick(View v) {
        choseHeadImageFromCameraCapture();
      }
    });
  }
 
  // 从本地相册选取图片作为头像
  private void choseHeadImageFromGallery() {
    Intent intentFromGallery = new Intent();
    // 设置文件类型
    intentFromGallery.setType("image/*");
    intentFromGallery.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(intentFromGallery, CODE_GALLERY_REQUEST);
  }
 
  // 启动手机相机拍摄照片作为头像
  private void choseHeadImageFromCameraCapture() {
    Intent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
 
    // 判断存储卡是否可用，存储照片文件
    if (hasSdcard()) {
      intentFromCapture.putExtra(MediaStore.EXTRA_OUTPUT, Uri
          .fromFile(new File(Environment
              .getExternalStorageDirectory(), IMAGE_FILE_NAME)));
    }
 
    startActivityForResult(intentFromCapture, CODE_CAMERA_REQUEST);
  }
 
  @Override
  protected void onActivityResult(int requestCode, int resultCode,
      Intent intent) {
 
    // 用户没有进行有效的设置操作，返回
    if (resultCode == RESULT_CANCELED) {
      Toast.makeText(getApplication(), "取消", Toast.LENGTH_LONG).show();
      return;
    }
 
    switch (requestCode) {
    case CODE_GALLERY_REQUEST:
      cropRawPhoto(intent.getData());
      break;
 
    case CODE_CAMERA_REQUEST:
      if (hasSdcard()) {
        File tempFile = new File(
            Environment.getExternalStorageDirectory(),
            IMAGE_FILE_NAME);
        cropRawPhoto(Uri.fromFile(tempFile));
      } else {
        Toast.makeText(getApplication(), "没有SDCard!", Toast.LENGTH_LONG)
            .show();
      }
 
      break;
 
    case CODE_RESULT_REQUEST:
      if (intent != null) {
        setImageToHeadView(intent);
      }
 
      break;
    }
 
    super.onActivityResult(requestCode, resultCode, intent);
  }
 
  /**
   * 裁剪原始的图片
   */
  public void cropRawPhoto(Uri uri) {
 
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");
 
    // 设置裁剪
    intent.putExtra("crop", "true");
 
    // aspectX , aspectY :宽高的比例
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
 
    // outputX , outputY : 裁剪图片宽高
    intent.putExtra("outputX", output_X);
    intent.putExtra("outputY", output_Y);
    intent.putExtra("return-data", true);
 
    startActivityForResult(intent, CODE_RESULT_REQUEST);
  }
 
  /**
   * 提取保存裁剪之后的图片数据，并设置头像部分的View
   */
  private void setImageToHeadView(Intent intent) {
    Bundle extras = intent.getExtras();
    if (extras != null) {
      Bitmap photo = extras.getParcelable("data");
      headImage.setImageBitmap(photo);
    }
  }
 
  /**
   * 检查设备是否存在SDCard的工具方法
   */
  public static boolean hasSdcard() {
    String state = Environment.getExternalStorageState();
    if (state.equals(Environment.MEDIA_MOUNTED)) {
      // 有存储的SDCard
      return true;
    } else {
      return false;
    }
  }
}