Android拍照或从图库选择图片并裁剪

//构建隐式IntentIntent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//调用系统相机startActivityForResult(intent, 1);

//用户点击了取消if(data == null){  return;}else{  Bundle extras = data.getExtras();  if (extras != null){    //获得拍的照片    Bitmap bm = extras.getParcelable("data");  }}

if (data == null){  return;}else{  //用户从图库选择图片后会返回所选图片的Uri  Uri uri;  //获取到用户所选图片的Uri  uri = data.getData();}

 /** * 将Bitmap写入SD卡中的一个文件中,并返回写入文件的Uri * @param bm * @param dirPath * @return */private Uri saveBitmap(Bitmap bm, String dirPath) {  //新建文件夹用于存放裁剪后的图片  File tmpDir = new File(Environment.getExternalStorageDirectory() + "/" + dirPath);  if (!tmpDir.exists()){    tmpDir.mkdir();  }  //新建文件存储裁剪后的图片  File img = new File(tmpDir.getAbsolutePath() + "/avator.png");  try {    //打开文件输出流    FileOutputStream fos = new FileOutputStream(img);    //将bitmap压缩后写入输出流(参数依次为图片格式、图片质量和输出流)    bm.compress(Bitmap.CompressFormat.PNG, 85, fos);    //刷新输出流    fos.flush();    //关闭输出流    fos.close();    //返回File类型的Uri    return Uri.fromFile(img);  } catch (FileNotFoundException e) {    e.printStackTrace();    return null;  } catch (IOException e) {    e.printStackTrace();    return null;  }}

 /*** 将content类型的Uri转化为文件类型的Uri* @param uri* @return*/private Uri convertUri(Uri uri){  InputStream is;  try {    //Uri ----> InputStream    is = getContentResolver().openInputStream(uri);    //InputStream ----> Bitmap    Bitmap bm = BitmapFactory.decodeStream(is);    //关闭流    is.close();    return saveBitmap(bm, "temp");  } catch (FileNotFoundException e) {    e.printStackTrace();    return null;  } catch (IOException e) {    e.printStackTrace();    return null;  }}

 /** * 通过Uri传递图像信息以供裁剪 * @param uri */private void startImageZoom(Uri uri){  //构建隐式Intent来启动裁剪程序  Intent intent = new Intent("com.android.camera.action.CROP");  //设置数据uri和类型为图片类型  intent.setDataAndType(uri, "image/*");  //显示View为可裁剪的  intent.putExtra("crop", true);  //裁剪的宽高的比例为1:1  intent.putExtra("aspectX", 1);  intent.putExtra("aspectY", 1);  //输出图片的宽高均为150  intent.putExtra("outputX", 150);  intent.putExtra("outputY", 150);  //裁剪之后的数据是通过Intent返回  intent.putExtra("return-data", true);  startActivityForResult(intent, CROP_CODE);}

<?xml version="1.0" encoding="utf-8"?><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/show_image"    android:layout_width="match_parent"    android:layout_height="300dp"/>  <Button    android:id="@+id/choose_camera"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="摄像头"/>  <Button    android:id="@+id/choose_gallery"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="相册"/></LinearLayout>

public class MainActivity extends AppCompatActivity implements View.OnClickListener {  //用于展示选择的图片  private ImageView mImageView;  private static final int CAMERA_CODE = 1;  private static final int GALLERY_CODE = 2;  private static final int CROP_CODE = 3;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();  }  private void initView() {    mImageView = (ImageView) findViewById(R.id.show_image);    Button chooseCamera = (Button) findViewById(R.id.choose_camera);    chooseCamera.setOnClickListener(this);    Button chooseGallery = (Button) findViewById(R.id.choose_gallery);    chooseGallery.setOnClickListener(this);  }  @Override  public void onClick(View view) {    switch (view.getId()){      case R.id.choose_camera:        //拍照选择        chooseFromCamera();        break;      case R.id.choose_gallery:        //从相册选取        chooseFromGallery();        break;      default:        break;    }  }  /**   * 拍照选择图片   */  private void chooseFromCamera() {    //构建隐式Intent    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);    //调用系统相机    startActivityForResult(intent, CAMERA_CODE);  }  /**   * 从相册选择图片   */  private void chooseFromGallery() {    //构建一个内容选择的Intent    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);    //设置选择类型为图片类型    intent.setType("image/*");    //打开图片选择    startActivityForResult(intent, GALLERY_CODE);  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    switch (requestCode){      case CAMERA_CODE:        //用户点击了取消        if(data == null){          return;        }else{          Bundle extras = data.getExtras();          if (extras != null){            //获得拍的照片            Bitmap bm = extras.getParcelable("data");            //将Bitmap转化为uri            Uri uri = saveBitmap(bm, "temp");            //启动图像裁剪            startImageZoom(uri);          }        }        break;      case GALLERY_CODE:        if (data == null){          return;        }else{          //用户从图库选择图片后会返回所选图片的Uri          Uri uri;          //获取到用户所选图片的Uri          uri = data.getData();          //返回的Uri为content类型的Uri,不能进行复制等操作,需要转换为文件Uri          uri = convertUri(uri);          startImageZoom(uri);        }        break;      case CROP_CODE:        if (data == null){          return;        }else{          Bundle extras = data.getExtras();          if (extras != null){            //获取到裁剪后的图像            Bitmap bm = extras.getParcelable("data");            mImageView.setImageBitmap(bm);          }        }        break;      default:        break;    }  }  /**   * 将content类型的Uri转化为文件类型的Uri   * @param uri   * @return   */  private Uri convertUri(Uri uri){    InputStream is;    try {      //Uri ----> InputStream      is = getContentResolver().openInputStream(uri);      //InputStream ----> Bitmap      Bitmap bm = BitmapFactory.decodeStream(is);      //关闭流      is.close();      return saveBitmap(bm, "temp");    } catch (FileNotFoundException e) {      e.printStackTrace();      return null;    } catch (IOException e) {      e.printStackTrace();      return null;    }  }  /**   * 将Bitmap写入SD卡中的一个文件中,并返回写入文件的Uri   * @param bm   * @param dirPath   * @return   */  private Uri saveBitmap(Bitmap bm, String dirPath) {    //新建文件夹用于存放裁剪后的图片    File tmpDir = new File(Environment.getExternalStorageDirectory() + "/" + dirPath);    if (!tmpDir.exists()){      tmpDir.mkdir();    }    //新建文件存储裁剪后的图片    File img = new File(tmpDir.getAbsolutePath() + "/avator.png");    try {      //打开文件输出流      FileOutputStream fos = new FileOutputStream(img);      //将bitmap压缩后写入输出流(参数依次为图片格式、图片质量和输出流)      bm.compress(Bitmap.CompressFormat.PNG, 85, fos);      //刷新输出流      fos.flush();      //关闭输出流      fos.close();      //返回File类型的Uri      return Uri.fromFile(img);    } catch (FileNotFoundException e) {      e.printStackTrace();      return null;    } catch (IOException e) {      e.printStackTrace();      return null;    }  }  /**   * 通过Uri传递图像信息以供裁剪   * @param uri   */  private void startImageZoom(Uri uri){    //构建隐式Intent来启动裁剪程序    Intent intent = new Intent("com.android.camera.action.CROP");    //设置数据uri和类型为图片类型    intent.setDataAndType(uri, "image/*");    //显示View为可裁剪的    intent.putExtra("crop", true);    //裁剪的宽高的比例为1:1    intent.putExtra("aspectX", 1);    intent.putExtra("aspectY", 1);    //输出图片的宽高均为150    intent.putExtra("outputX", 150);    intent.putExtra("outputY", 150);    //裁剪之后的数据是通过Intent返回    intent.putExtra("return-data", true);    startActivityForResult(intent, CROP_CODE);  }}