Android实现点击更换头像

开发中经常会有这样的要求：用户可以点击头像更换成自己想要的头像。
思路是这样的：点击头像可以选择从相册中选择或者通过拍照完成设置。
这里也就需要两步来实现：一是从相册，而是拍照。
这里用到了一个开源的工具类：RoundImageView，该类实现了绘制圆形图片。以及用到了开源的文件创建类：FileUitlity，在文章得最后我将把两个类中的代码分享下。
为了实现主要功能，布局就一个RoundImageView 组件，该组件需要导入上面提到的RoundImageView 。

<com.inext.test.datatest.util.RoundImageView
        android:id="@+id/roundImageView"
        android:src="@mipmap/ic_launcher"
        android:layout_width="60dp"
        android:layout_height="60dp" />

Activity.class中的核心代码：

//获取组件
RoundImageView roundImageView = (RoundImageView)findViewById(R.id.roundImageView);
//绑定监听
 roundImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            //PopupWindow----START-----这里开始到下面标记的地方是实现点击头像弹出PopupWindow，实现用户从PopupWindow中选择更换头像的方式
                backgroundAlpha(0.3f);
                View view = LayoutInflater.from(getBaseContext()).inflate(R.layout.popu_window,null);
                final PopupWindow popupWindow = new PopupWindow(view, ActionBar.LayoutParams.WRAP_CONTENT,ActionBar.LayoutParams.WRAP_CONTENT, true);
                popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
                popupWindow.setOutsideTouchable(true);
                popupWindow.setFocusable(true);
                //获取屏幕宽度
                DisplayMetrics dm = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(dm);
                popupWindow.setWidth(dm.widthPixels);
                popupWindow.setAnimationStyle(R.style.popuwindow);
                //显示位置
                popupWindow.showAtLocation(view, Gravity.BOTTOM, 0, 0);
                popupWindow.setOnDismissListener(new poponDismissListener());

                //PopupWindow-----END
                //PopupWindow中对应的选择按钮
                Button button = (Button)view.findViewById(R.id.take_photo);//通过拍照的方式
                Button button1 = (Button)view.findViewById(R.id.all_photo);//通过相册的方式
                Button button2 = (Button)view.findViewById(R.id.out);//取消按钮
                button2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        backgroundAlpha(1f);
                        popupWindow.dismiss();
                    }
                });
                button1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        backgroundAlpha(1f);
                        popupWindow.dismiss();
                        //调用手机相册的方法,该方法在下面有具体实现
                        allPhoto();
                    }
                });
                button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        backgroundAlpha(1f);
                        popupWindow.dismiss();
                        //调用手机照相机的方法,通过Intent调用系统相机完成拍照，并调用系统裁剪器裁剪照片
                        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        //创建文件路径,头像保存的路径
                        File file =FileUitlity.getInstance(getApplicationContext()).makeDir("head_image");
                        //定义图片路径和名称
                        path = file.getParent() + File.separatorChar + System.currentTimeMillis() + ".jpg";
                        //保存图片到Intent中，并通过Intent将照片传给系统裁剪器
                        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(path)));
                        //图片质量
                        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
                        //启动有返回的Intent，即返回裁剪好的图片到RoundImageView组件中显示
                        startActivityForResult(intent, REQUEST_CODE);
                    }
                });
            }
        });

    //该方法实现通过何种方式跟换图片
        @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //如果返回码不为-1，则表示不成功
        if (resultCode != Activity.RESULT_OK){
            return;
        }
        if (requestCode == ALL_PHOTO){
            //调用相册
            Cursor cursor = this.getContentResolver().query(data.getData(),
                    new String[]{MediaStore.Images.Media.DATA},null,null,null);
            //游标移到第一位，即从第一位开始读取
            cursor.moveToFirst();
            String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
            cursor.close();
            //调用系统裁剪
            startPhoneZoom(Uri.fromFile(new File(path)));
        }else if (requestCode == REQUEST_CODE){
            //相机返回结果，调用系统裁剪
            startPhoneZoom(Uri.fromFile(new File(path)));
        }else if(requestCode == RESULT_PHOTO) {
            //设置裁剪返回的位图
            Bundle bundle = data.getExtras();
            if (bundle!=null){
                Bitmap bitmap = bundle.getParcelable("data");
                //将裁剪后得到的位图在组件中显示
                roundImageView.setImageBitmap(bitmap);
            }
        }
    }
    //调用系统裁剪的方法
    private void startPhoneZoom(Uri uri){
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        //是否可裁剪
        intent.putExtra("corp", "true");
        //裁剪器高宽比
        intent.putExtra("aspectY",1);
        intent.putExtra("aspectX",1);
        //设置裁剪框高宽
        intent.putExtra("outputX",150);
        intent.putExtra("outputY", 150);
        //返回数据
        intent.putExtra("return-data",true);
        startActivityForResult(intent,RESULT_PHOTO);
    }

    //调用手机相册
    private void allPhoto(){
        Intent intent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent,ALL_PHOTO);
    }

    /** * 添加PopupWindow关闭的事件，主要是为了将背景透明度改回来 * */
    class poponDismissListener implements PopupWindow.OnDismissListener{

        @Override
        public void onDismiss() {
            // TODO Auto-generated method stub
            //Log.v("List_noteTypeActivity:", "我是关闭事件");
            backgroundAlpha(1f);
        }

    }
    /** * 设置添加屏幕的背景透明度 * @param bgAlpha */
    public void backgroundAlpha(float bgAlpha)
    {
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = bgAlpha; //0.0-1.0
        getWindow().setAttributes(lp);
    }

权限设置：

 <!-- 读取 -->
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <!-- 写入权限 -->
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  <!-- 创建与删除权限 -->
 <uses-permission android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS" />

两个开源的工具类，这两个类可直接复制使用：
FileUitlity.java:

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

import java.io.File;

public class FileUitlity {
    private static String ROOT_CACHE;
    public static String ROOT_DIR="yt_xyt";
    private static FileUitlity instance = null;
    private FileUitlity() {
    }
    public static FileUitlity getInstance(Context context) {
        if (instance == null) {
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                ROOT_CACHE = (Environment.getExternalStorageDirectory() + "/"
                        + ROOT_DIR + "/");
            } else {
                ROOT_CACHE = (context.getFilesDir().getAbsolutePath() + "/"+ROOT_DIR+"/");
            }
            File dir = new File(ROOT_CACHE);
            if (!dir.exists()) {
                dir.mkdirs();
            }
            instance = new FileUitlity();
        }
        return instance;
    }
    public File makeDir(String dir) {
        File fileDir = new File(ROOT_CACHE + dir);
        if (fileDir.exists()) {
            return fileDir;
        } else {
            fileDir.mkdirs();
            return fileDir;
        }
    }   
}

RoundImageView.java:

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class RoundImageView extends ImageView {
    public RoundImageView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();

        if (drawable == null) {
            return;
        }

        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }

        Bitmap b = null;
        if(drawable instanceof BitmapDrawable){
            b = ((BitmapDrawable) drawable).getBitmap();
        }else if(drawable instanceof Drawable){
            b = Bitmap.createBitmap(   
                        getWidth(),   
                        getHeight(),   
                        drawable.getOpacity() != PixelFormat.OPAQUE ? Config.ARGB_8888
                        : Config.RGB_565);
                        Canvas canvas1 = new Canvas(b);   
                        // canvas.setBitmap(bitmap); 
                        drawable.setBounds(0, 0, getWidth(),   
                        getHeight());   
                        drawable.draw(canvas1);  
        }

        if (null == b) {
            return;
        }

        Bitmap bitmap = b.copy(Config.ARGB_8888, true);
        int w = getWidth(), h = getHeight();

        Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
        canvas.drawBitmap(roundBitmap, 0, 0, null);

    }

    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
        Bitmap sbmp;
        if (bmp.getWidth() != radius || bmp.getHeight() != radius)
            sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
        else
            sbmp = bmp;
        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(),
                Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = 0xffa19774;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor("#BAB399"));
        canvas.drawCircle(sbmp.getWidth() / 2 + 0.7f,
                sbmp.getHeight() / 2 + 0.7f, sbmp.getWidth() / 2 + 0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(sbmp, rect, rect, paint);
        return output;
    }
}