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[操作系统]拍照和相册中得到裁剪图片


QQ图片20151229122330

<LinearLayout ="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <Button    android:id="@+id/take_photo"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="Take Photo" />  <Button    android:id="@+id/get_photo"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="get Photo" />  <ImageView    android:id="@+id/picture"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_gravity="center_horizontal" /></LinearLayout>

package com.example.choosepictest;import java.io.File;import java.io.IOException;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity implements OnClickListener {  public static final int TAKE_PHOTO = 1;  public static final int CROP_PHOTO = 2;  public static final int GET_PHOTO = 3;  private Button takePhoto;  private Button getPhoto;  private ImageView picture;  private Uri headImgUri;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    takePhoto = (Button) findViewById(R.id.take_photo);    getPhoto = (Button) findViewById(R.id.get_photo);    picture = (ImageView) findViewById(R.id.picture);    takePhoto.setOnClickListener(this);    getPhoto.setOnClickListener(this);  }  @Override  public void onClick(View v) {    switch (v.getId()) {    case R.id.take_photo:      takePhoto();      break;    case R.id.get_photo:      getPhoto();      break;    default:      break;    }  }  // 拍照  private void takePhoto() {    File appDir = new File(Environment.getExternalStorageDirectory(),        "/etoury/picCache");    if (!appDir.exists()) {      appDir.mkdir();    }    String fileName = "user_head" + ".jpg";    File outputImage = new File(appDir, fileName);    try {      if (outputImage.exists()) {        outputImage.delete();      }      outputImage.createNewFile();    } catch (IOException e) {      e.printStackTrace();    }    headImgUri = Uri.fromFile(outputImage);    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");    intent.putExtra(MediaStore.EXTRA_OUTPUT, headImgUri);    startActivityForResult(intent, TAKE_PHOTO);  }  // 定向到图片库  private void getPhoto() {    Intent intent = new Intent(Intent.ACTION_PICK,        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);    startActivityForResult(intent, GET_PHOTO);  }  /**   * 裁剪   */  private void crop(Uri uri) {    // 裁剪图片意图    Intent intent = new Intent("com.android.camera.action.CROP");    intent.setDataAndType(uri, "image/*");    // 下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪    intent.putExtra("crop", "true");    intent.putExtra("scale", true);// 去黑边    // 裁剪框的比例,1:1    intent.putExtra("aspectX", 1);// 输出是X方向的比例    intent.putExtra("aspectY", 1);    // 裁剪后输出图片的尺寸大小,不能太大500程序崩溃    intent.putExtra("outputX", 256);    intent.putExtra("outputY", 256);    // 图片格式    /* intent.putExtra("outputFormat", "JPEG"); */    intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());    // intent.putExtra("noFaceDetection", true);// 取消人脸识别    intent.putExtra("return-data", true);// true:返回uri,false:不返回uri    // 同一个地址下 裁剪的图片覆盖拍照的图片    intent.putExtra(MediaStore.EXTRA_OUTPUT, headImgUri);    startActivityForResult(intent, CROP_PHOTO);  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    switch (requestCode) {    case GET_PHOTO:      if (resultCode == RESULT_OK) {        crop(data.getData());      }      break;    case TAKE_PHOTO:      if (resultCode == RESULT_OK) {        crop(headImgUri);      }      break;    case CROP_PHOTO:      if (resultCode == RESULT_OK) {        Bitmap cropbitmap = data.getParcelableExtra("data");        picture.setImageBitmap(cropbitmap);      }      break;    default:      break;    }  }}

总结:

1.  拍照返回一张图片,可以是全尺寸的图片

2.  拍照返回图片的地址问题,一个目录下的一个文件

3. 裁剪的图片的地址, 覆盖了全尺寸图片的地址

4. 相册intent 返回的是一个uir , 不是string

5. 裁剪的图片,不能覆盖相册返回的uri(一定注意)