android 裁剪图片(支持拍照和从相册读取图片)

【实例截图】

【核心代码】

package com.jerry.crop;

import java.io.File;

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.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
	private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
	private static final int PHOTO_REQUEST_CUT = 3;// 结果

	private ImageView iv_image;

	/* 头像名称 */
	private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
	private File tempFile;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		this.iv_image = (ImageView) this.findViewById(R.id.iv_image);
	}

	/*
	 * 从相册获取
	 */
	public void gallery(View view) {
		// 激活系统图库，选择一张图片
		Intent intent = new Intent(Intent.ACTION_PICK);
		intent.setType("image/*");
		// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_GALLERY
		startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
	}

	/*
	 * 从相机获取
	 */
	public void camera(View view) {
		// 激活相机
		Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
		// 判断存储卡是否可以用，可用进行存储
		if (hasSdcard()) {
			tempFile = new File(Environment.getExternalStorageDirectory(),
					PHOTO_FILE_NAME);
			// 从文件中创建uri
			Uri uri = Uri.fromFile(tempFile);
			intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
		}
		// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
		startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
	}

	/*
	 * 剪切图片
	 */
	private void crop(Uri uri) {
		// 裁剪图片意图
		Intent intent = new Intent("com.android.camera.action.CROP");
		intent.setDataAndType(uri, "image/*");
		intent.putExtra("crop", "true");
		// 裁剪框的比例，1：1
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1);
		// 裁剪后输出图片的尺寸大小
		intent.putExtra("outputX", 250);
		intent.putExtra("outputY", 250);

		intent.putExtra("outputFormat", "JPEG");// 图片格式
		intent.putExtra("noFaceDetection", true);// 取消人脸识别
		intent.putExtra("return-data", true);
		// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
		startActivityForResult(intent, PHOTO_REQUEST_CUT);
	}

	/*
	 * 判断sdcard是否被挂载
	 */
	private boolean hasSdcard() {
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			return true;
		} else {
			return false;
		}
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == PHOTO_REQUEST_GALLERY) {
			// 从相册返回的数据
			if (data != null) {
				// 得到图片的全路径
				Uri uri = data.getData();
				crop(uri);
			}

		} else if (requestCode == PHOTO_REQUEST_CAREMA) {
			// 从相机返回的数据
			if (hasSdcard()) {
				crop(Uri.fromFile(tempFile));
			} else {
				Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！", 0).show();
			}

		} else if (requestCode == PHOTO_REQUEST_CUT) {
			// 从剪切图片返回的数据
			if (data != null) {
				Bitmap bitmap = data.getParcelableExtra("data");
				this.iv_image.setImageBitmap(bitmap);
			}
			try {
				// 将临时文件删除
				tempFile.delete();
			} catch (Exception e) {
				e.printStackTrace();
			}

		}

		super.onActivityResult(requestCode, resultCode, data);
	}
}