android调用系统相机或图库获取裁剪后的图片

转自:https://www.jianshu.com/p/d3aa8b80d87c

权限

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    tools:context="com.xtm.takepicdemo.MainActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="takePicOnClick0"
        android:text="拍照获取图片" />
     <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="takePicOnClick1"
        android:text="图库获取图片" />
    <ImageView 
        android:id="@+id/iv_pic"
        android:layout_width="200dp" 
        android:layout_height="200dp"
        android:src="@drawable/ic_launcher"
        />

</LinearLayout>

代码

package com.xtm.takepicdemo;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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 ImageView ivPicImageView;
    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);
        ivPicImageView = (ImageView) findViewById(R.id.iv_pic);
    }

    public void takePicOnClick0(View view) {
        String state = Environment.getExternalStorageState();
        if (state.equals(Environment.MEDIA_MOUNTED)) {
            // 拍照选择
            chooseFromCamera();
        } else {
            Toast.makeText(this, "sdcard不可用", Toast.LENGTH_SHORT).show();
        }
    }

    public void takePicOnClick1(View view) {
        String state = Environment.getExternalStorageState();
        if (state.equals(Environment.MEDIA_MOUNTED)) {
            // 从相册选取
            chooseFromGallery();
        } else {
            Toast.makeText(this, "sdcard不可用", Toast.LENGTH_SHORT).show();
        }
    }

    /**
     * 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);
    }

    // 拍照选择图片
    private void chooseFromCamera() {
        // 调用系统相机
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, CAMERA_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case CAMERA_CODE:
            if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "取消了拍照", Toast.LENGTH_LONG).show();
                return;
            }
            if (data != null) {
                Bitmap photo = data.getParcelableExtra("data");
                // 将Bitmap转化为uri
                Uri uri = saveBitmap(photo, "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");
                    ivPicImageView.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 {
            is = getContentResolver().openInputStream(uri);
            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);
    }

}