【Android笔记】Androd手机拍照或从相册选取图片作为头像

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;
        }
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />
 
    <Button
        android:id="@+id/buttonLocal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="本地相册选取头像" />
 
    <Button
        android:id="@+id/buttonCamera"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="手机拍照选取头像" />
 
</LinearLayout>

参考原文：http://www.open-open.com/lib/view/open1428569177447.html