照相机和相册开启和获取

用户头像选择或者拍照上传，并对图片进行大小的压缩，和形状的控制，可以将用户选择到的图片裁剪成圆形上传。

<!--读写sd卡权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

第一步写两个工具类

package com.example.xiangce;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;

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

/**
 * Created by asus on 2017/11/29.
 */
public class ImageUtils {

    /**
     * Save image to the SD card
     *
     * @param photoBitmap
     * @param photoName
     * @param path
     */
    public static String savePhoto(Bitmap photoBitmap, String path,
                                   String photoName) {
        String localPath = null;
        if (android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED)) {
            File dir = new File(path);
            if (!dir.exists()) {
                dir.mkdirs();
            }

            File photoFile = new File(path, photoName + ".png");
            FileOutputStream fileOutputStream = null;
            try {
                fileOutputStream = new FileOutputStream(photoFile);
                if (photoBitmap != null) {
                    if (photoBitmap.compress(Bitmap.CompressFormat.PNG, 100,
                            fileOutputStream)) { // 转换完成
                        localPath = photoFile.getPath();
                        fileOutputStream.flush();
                    }
                }
            } catch (FileNotFoundException e) {
                photoFile.delete();
                localPath = null;
                e.printStackTrace();
            } catch (IOException e) {
                photoFile.delete();
                localPath = null;
                e.printStackTrace();
            } finally {
                try {
                    if (fileOutputStream != null) {
                        fileOutputStream.close();
                        fileOutputStream = null;
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return localPath;
    }

    /**
     * 转换图片成圆形
     *
     * @param bitmap 传入Bitmap对象
     * @return
     */
    public static Bitmap toRoundBitmap(Bitmap bitmap) {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        float roundPx;
        float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;
        if (width <= height) {
            roundPx = width / 2;
            top = 0;
            bottom = width;
            left = 0;
            right = width;
            height = width;
            dst_left = 0;
            dst_top = 0;
            dst_right = width;
            dst_bottom = width;
        } else {
            roundPx = height / 2;
            float clip = (width - height) / 2;
            left = clip;
            right = width - clip;
            top = 0;
            bottom = height;
            width = height;
            dst_left = 0;
            dst_top = 0;
            dst_right = height;
            dst_bottom = height;
        }
        Bitmap output = Bitmap.createBitmap(width,
                height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);
        final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);
        final RectF rectF = new RectF(dst);
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, src, dst, paint);
        return output;
    }
}

package com.example.xiangce;

import android.content.Context;
import android.os.Environment;

import java.io.File;

/**
 * Created by yuerq on 2016/5/30.
 */
public class AppConfig {

    public static final String APP_PATH = Environment
            .getExternalStorageDirectory()
            + File.separator
            + "pandatv"
            + File.separator;

    /** 默认存放图片的路径 */
    public final static String DEFAULT_IMAGE_PATH = APP_PATH
            + "camera"
            + File.separator;

    /** 默认存放文件的路径 */
    public final static String DEFAULT_CACHE_PATH = APP_PATH
            + "cache"
            + File.separator;



    private Context mContext;
    private static AppConfig appConfig;

    private AppConfig() {
    }

    public static AppConfig getAppConfig() {
        if (appConfig == null) {
             appConfig = new AppConfig();
        }
        return appConfig;
    }

    public void init(Context context) {
       File file = new File(DEFAULT_IMAGE_PATH);
        if (!file.exists()) {
            file.mkdirs();
        }

        file = new File(DEFAULT_CACHE_PATH);
        if (!file.exists()) {
            file.mkdirs();
        }

//        DBInterface.getInstance().initDbHelp(context);
//
//        //设置okhttp缓存
//        File cacheFolder = context.getCacheDir();
//        Cache cache = new Cache(cacheFolder, 50 * 1024 * 1024); //100Mb
//        OkHttpClient okHttpClient = new OkHttpClient.Builder()
//                .cache(cache)
////                .addInterceptor(InterceptorFactory.getLoggingInterceptor())
//                .build();
//        Network.getInstance().init(okHttpClient);

        mContext = context.getApplicationContext();

    }
}

第二步Aci'ti

package com.example.xiangce;

import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    protected static final int CHOOSE_PICTURE = 0;
    protected static final int TAKE_PICTURE = 1;
    private static final int CROP_SMALL_PICTURE = 2;
    protected static Uri tempUri;
    private ImageView iv_personal_icon;
    private Button but;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        iv_personal_icon = (ImageView) findViewById(R.id.iv_personal_icon);
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showChoosePicDialog(but);
            }
        });
    }

    /**
     * 显示修改头像的对话框
     */
    public void showChoosePicDialog(View v) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("设置头像");
        String[] items = {"选择本地照片", "拍照"};
        builder.setNegativeButton("取消", null);
        builder.setItems(items, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which) {
                    case CHOOSE_PICTURE: // 选择本地照片
                        Intent openAlbumIntent = new Intent(Intent.ACTION_GET_CONTENT);
                        openAlbumIntent.setType("image/*");
                        startActivityForResult(openAlbumIntent, CHOOSE_PICTURE);
                        break;
                    case TAKE_PICTURE: // 拍照
                        takePicture();
                        break;
                }
            }
        });
        builder.create().show();
    }

    private void takePicture() {
        String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
        if (Build.VERSION.SDK_INT >= 23) {
            // 需要申请动态权限
            int check = ContextCompat.checkSelfPermission(this, permissions[0]);
            // 权限是否已经 授权 GRANTED---授权  DINIED---拒绝
            if (check != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
            }
        }
        Intent openCameraIntent = new Intent(
                MediaStore.ACTION_IMAGE_CAPTURE);
        File file = new File(Environment
                .getExternalStorageDirectory(), "image.jpg");
        //判断是否是AndroidN以及更高的版本
        if (Build.VERSION.SDK_INT >= 24) {
            openCameraIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            tempUri = FileProvider.getUriForFile(MainActivity.this, "com.lt.uploadpicdemo.fileProvider", file);
        } else {
            tempUri = Uri.fromFile(new File(Environment
                    .getExternalStorageDirectory(), "image.jpg"));
        }
        // 指定照片保存路径（SD卡），image.jpg为一个临时文件，每次拍照后这个图片都会被替换
        openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
        startActivityForResult(openCameraIntent, TAKE_PICTURE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) { // 如果返回码是可以用的
            switch (requestCode) {
                case TAKE_PICTURE:
                    startPhotoZoom(tempUri); // 开始对图片进行裁剪处理
                    break;
                case CHOOSE_PICTURE:
                    startPhotoZoom(data.getData()); // 开始对图片进行裁剪处理
                    break;
                case CROP_SMALL_PICTURE:
                    if (data != null) {
                        setImageToView(data); // 让刚才选择裁剪得到的图片显示在界面上
                    }
                    break;
            }
        }
    }

    /**
     * 裁剪图片方法实现
     *
     * @param uri
     */
    protected void startPhotoZoom(Uri uri) {
        if (uri == null) {
            Log.i("tag", "The uri is not exist.");
        }
        tempUri = uri;
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        // 设置裁剪
        intent.putExtra("crop", "true");
        // aspectX aspectY 是宽高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高
        intent.putExtra("outputX", 150);
        intent.putExtra("outputY", 150);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, CROP_SMALL_PICTURE);
    }

    /**
     * 保存裁剪之后的图片数据
     *
     * @param
     */
    protected void setImageToView(Intent data) {
        Bundle extras = data.getExtras();
        if (extras != null) {
            Bitmap photo = extras.getParcelable("data");
            Log.d(TAG, "setImageToView:" + photo);
            photo = ImageUtils.toRoundBitmap(photo); // 这个时候的图片已经被处理成圆形的了
            iv_personal_icon.setImageBitmap(photo);
            uploadPic(photo);
        }
    }

    private void uploadPic(Bitmap bitmap) {
        // 上传至服务器
        // ... 可以在这里把Bitmap转换成file，然后得到file的url，做文件上传操作
        // 注意这里得到的图片已经是圆形图片了
        // bitmap是没有做个圆形处理的，但已经被裁剪了
        String imagePath = ImageUtils.savePhoto(bitmap, Environment
                .getExternalStorageDirectory().getAbsolutePath(), String
                .valueOf(System.currentTimeMillis()));
        Log.e("imagePath", imagePath + "");
        if (imagePath != null) {
            // 拿着imagePath上传了
            // ...
            Log.d(TAG, "imagePath:" + imagePath);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

        } else {
            // 没有获取 到权限，从新请求，或者关闭app
            Toast.makeText(this, "需要存储权限", Toast.LENGTH_SHORT).show();
        }
    }

    private void initView() {
        but = (Button) findViewById(R.id.but);
    }
}