本人第一次寫技術部落格，只是為了對自己平時遇到的一些問題進行一個總結，可以讓以後能更好的翻看學習，也可以讓更多的人借鑑。

廢話不多說，正題開始：

首先先說明如何進行從相簿選擇或者直接拍照來設定頭像，然後在進行圓形頭像的設定。具體的介面效果如下所示：

實現底部彈出的程式碼如下SelectPickPopupWindow.class，需要整合PopupWindow，程式碼：

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.ColorDrawable;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;
public class SelectPicPopupWindow extends 
 
PopupWindow {
    private Button btn_take_photo, btn_pick_photo, btn_cancel;
    private View mMenuView;
    public SelectPicPopupWindow(Activity context, View.OnClickListener itemsOnClick) {
        super(context);
LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE
 
);
mMenuView = inflater.inflate(R.layout.activity_select_pic_popup_window, null);
btn_take_photo = (Button) mMenuView.findViewById(R.id.btn_take_photo);
btn_pick_photo = (Button) mMenuView.findViewById(R.id.btn_pick_photo);
btn_cancel = (Button) mMenuView.findViewById(R.id.btn_cancel);
btn_cancel.setOnClickListener(new View.OnClickListener() {
            @Override
public void onClick(View v) {
                dismiss();
}
        });
btn_pick_photo.setOnClickListener(itemsOnClick);
btn_take_photo.setOnClickListener(itemsOnClick);
//設定SelectPicPopupWindow的View
this.setContentView(mMenuView);
//設定SelectPicPopupWindow彈出窗體的寬
this.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
//設定SelectPicPopupWindow彈出窗體的高
this.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
//設定SelectPicPopupWindow彈出窗體可點選
this.setFocusable(true);
//設定SelectPicPopupWindow彈出窗體動畫效果
this.setAnimationStyle(R.style.AnimBottom);
//例項化一個ColorDrawable顏色為半透明
ColorDrawable dw = new ColorDrawable(0000000000);
//設定SelectPicPopupWindow彈出窗體的背景
this.setBackgroundDrawable(dw);
//mMenuView新增OnTouchListener監聽判斷獲取觸屏位置如果在選擇框外面則銷燬彈出框
mMenuView.setOnTouchListener(new View.OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {

                int height = mMenuView.findViewById(R.id.pop_layout).getTop();
                int y = (int) event.getY();
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    if (y < height) {
                        dismiss();
}
                }
                return true;
}
        });
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical">
    <LinearLayout
android:id="@+id/pop_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#343434"
android:gravity="center_horizontal"
android:orientation="vertical">
        <Button
android:id="@+id/btn_take_photo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:layout_marginTop="20dip"
android:background="#8e8e8e"
android:text="拍照"
android:textStyle="bold" />
        <Button
android:id="@+id/btn_pick_photo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:layout_marginTop="5dip"
android:background="#8e8e8e"
android:text="從相簿選擇"
android:textStyle="bold" />
        <Button
android:id="@+id/btn_cancel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="15dip"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:layout_marginTop="15dip"
android:background="#8e8e8e"
android:text="取消"
android:textColor="#ffffff"
android:textStyle="bold"
/>
    </LinearLayout>
</RelativeLayout>

這個底部的彈窗結束以後，在需要進行底部彈窗的地方進行呼叫就可以了。我這邊實現的關鍵程式碼如下所示：

//自定義的彈出框類
SelectPicPopupWindow menuWindow;

case R.id.img_edit:
    //例項化SelectPicPopupWindow
menuWindow = new SelectPicPopupWindow(MyInfoActivity.this, itemsOnClick);
//顯示視窗
    //設定layout在PopupWindow中顯示的位置
menuWindow.showAtLocation(MyInfoActivity.this.findViewById(R.id.rela_my_info), Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
    break;

這樣就實現了點選頭像編輯，底部彈出彈窗的效果。

然後我們對這個彈窗的按鈕進行監聽來進行照片的選擇以及拍照等功能的操作。

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;import com.kegoal.view.SelectPicPopupWindow;
import java.io.File;
public class MyInfoActivity extends AppCompatActivity implements View.OnClickListener {    private ImageView my_img, img_edit;
//自定義的彈出框類
SelectPicPopupWindow menuWindow;
/* 頭像檔案 */
private static final String IMAGE_FILE_NAME = "temp_head_image.jpg";
/* 請求識別碼 */
private static final int CODE_GALLERY_REQUEST = 0xa0;
    private static final int CODE_CAMERA_REQUEST = 0xa1;
    private static final int CODE_RESULT_REQUEST = 0xa2;
// 裁剪後圖片的寬(X)和高(Y),100 X 100的正方形。
private static int output_X = 100;
    private static int output_Y = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_info);

//獲取資源init()方法，自己定義。
init();
}

    //為底部彈出的視窗進行按鈕的監聽。
private View.OnClickListener itemsOnClick = new View.OnClickListener() {

        public void onClick(View v) {
            menuWindow.dismiss();
            switch (v.getId()) {
                //通過拍照獲取照片
case R.id.btn_take_photo:
                    choseHeadImageFromCameraCapture();
                    break;
//從相簿獲取照片
case R.id.btn_pick_photo:
                    choseHeadImageFromGallery();
                    break;
                default:
                    break;
}
        }
    };
// 從本地相簿選取圖片作為頭像
private void choseHeadImageFromGallery() {
        Intent intentFromGallery = new Intent();
// 設定檔案型別
intentFromGallery.setType("image/*");
intentFromGallery.setAction(Intent.ACTION_PICK);
startActivityForResult(intentFromGallery, CODE_GALLERY_REQUEST);
}

    // 啟動手機相機拍攝照片作為頭像
private void choseHeadImageFromCameraCapture() {
        Intent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// 判斷儲存卡是否可用，儲存照片檔案
if (hasSdcard()) {
            intentFromCapture.putExtra(MediaStore.EXTRA_OUTPUT, Uri
                    .fromFile(new File(Environment
                            .getExternalStorageDirectory(), IMAGE_FILE_NAME)));
}

        startActivityForResult(intentFromCapture, CODE_CAMERA_REQUEST);
}

    @Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {

        // 使用者沒有進行有效的設定操作，返回
if (resultCode == RESULT_CANCELED) {
//            Toast.makeText(getApplication(), "取消", Toast.LENGTH_LONG).show();
return;
}

        switch (requestCode) {
            case CODE_GALLERY_REQUEST:
                cropRawPhoto(intent.getData());
                break;
            case CODE_CAMERA_REQUEST:
                if (hasSdcard()) {
                    File tempFile = new File(
                            Environment.getExternalStorageDirectory(),
IMAGE_FILE_NAME);
cropRawPhoto(Uri.fromFile(tempFile));
} else {
                    Toast.makeText(getApplication(), "沒有SDCard!", Toast.LENGTH_LONG)
                            .show();
}

                break;
            case CODE_RESULT_REQUEST:
                if (intent != null) {
                    setImageToHeadView(intent);
}

                break;
}

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

    /**
     * 裁剪原始的圖片
     */
public void cropRawPhoto(Uri uri) {

        Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// 設定裁剪
intent.putExtra("crop", "true");
// aspectX , aspectY :寬高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX , outputY : 裁剪圖片寬高
intent.putExtra("outputX", output_X);
intent.putExtra("outputY", output_Y);
intent.putExtra("return-data", true);
startActivityForResult(intent, CODE_RESULT_REQUEST);
}

    /**
     * 提取儲存裁剪之後的圖片資料，並設定頭像部分的View
     */
private void setImageToHeadView(Intent intent) {
        Bundle extras = intent.getExtras();
        if (extras != null) {
            Bitmap photo = extras.getParcelable("data");
my_img.setImageBitmap(photo);
}
    }

    /**
     * 檢查裝置是否存在SDCard的工具方法
     */
public static boolean hasSdcard() {
        String state = Environment.getExternalStorageState();
        if (state.equals(Environment.MEDIA_MOUNTED)) {
            // 有儲存的SDCard
return true;
} else {
            return false;
}
    }
}

此時，我們就實現了對頭像的選擇方式的實現，my_edit的imageview是我們的頭像所對應的控制元件，而img_edit這個控制元件則是我們的編輯頭像的按鈕。

最後的一步也就是實現我們的頭像是圓形的操作。只需要將我們的imageview進行自定義成圓形的就行了，這樣不管你裡面放的什麼樣的圖片，都會顯示圓形的。不過不能設定能background，我們要利用src來進行對imageview的替換。具體實現程式碼如下所示：

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;/**
 * Created by Administrator on 2016/7/11 0011.
 */
public class CircleImageView extends ImageView {

    private static final ImageView.ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;
    private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
    private static final int COLORDRAWABLE_DIMENSION = 1;
    private static final int DEFAULT_BORDER_WIDTH = 0;
    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
    private final RectF mDrawableRect = new RectF();
    private final RectF mBorderRect = new RectF();
    private final Matrix mShaderMatrix = new Matrix();
    private final Paint mBitmapPaint = new Paint();
    private final Paint mBorderPaint = new Paint();
    private int mBorderColor = DEFAULT_BORDER_COLOR;
    private int mBorderWidth = DEFAULT_BORDER_WIDTH;
    private Bitmap mBitmap;
    private BitmapShader mBitmapShader;
    private int mBitmapWidth;
    private int mBitmapHeight;
    private float mDrawableRadius;
    private float mBorderRadius;
    private boolean mReady;
    private boolean mSetupPending;
    public CircleImageView(Context context) {
        super(context);
}

    public CircleImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
}

    public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        super.setScaleType(SCALE_TYPE);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);
mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);
mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);
a.recycle();
mReady = true;
        if (mSetupPending) {
            setup();
mSetupPending = false;
}
    }

    @Override
public ScaleType getScaleType() {
        return SCALE_TYPE;
}

    @Override
public void setScaleType(ScaleType scaleType) {
        if (scaleType != SCALE_TYPE) {
            throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
}
    }

    @Override
protected void onDraw(Canvas canvas) {
        if (getDrawable() == null) {
            return;
}

        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);
}

    @Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
setup();
}

    public int getBorderColor() {
        return mBorderColor;
}

    public void setBorderColor(int borderColor) {
        if (borderColor == mBorderColor) {
            return;
}

        mBorderColor = borderColor;
mBorderPaint.setColor(mBorderColor);
invalidate();
}

    public int getBorderWidth() {
        return mBorderWidth;
}

    public void setBorderWidth(int borderWidth) {
        if (borderWidth == mBorderWidth) {
            return;
}

        mBorderWidth = borderWidth;
setup();
}

    @Override
public void setImageBitmap(Bitmap bm) {
        super.setImageBitmap(bm);
mBitmap = bm;
setup();
}

    @Override
public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
mBitmap = getBitmapFromDrawable(drawable);
setup();
}

    @Override
public void setImageResource(int resId) {
        super.setImageResource(resId);
mBitmap = getBitmapFromDrawable(getDrawable());
setup();
}

    private Bitmap getBitmapFromDrawable(Drawable drawable) {
        if (drawable == null) {
            return null;
}

        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
}

        try {
            Bitmap bitmap;
            if (drawable instanceof ColorDrawable) {
                bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
} else {
                bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
}

            Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
            return bitmap;
} catch (OutOfMemoryError e) {
            return null;
}
    }

    private void setup() {
        if (!mReady) {
            mSetupPending = true;
            return;
}

        if (mBitmap == null) {
            return;
}

        mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setShader(mBitmapShader);
mBorderPaint.setStyle(Paint.Style.STROKE);
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(mBorderColor);
mBorderPaint.setStrokeWidth(mBorderWidth);
mBitmapHeight = mBitmap.getHeight();
mBitmapWidth = mBitmap.getWidth();
mBorderRect.set(0, 0, getWidth(), getHeight());
mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);
mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);
mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);
updateShaderMatrix();
invalidate();
}

    private void updateShaderMatrix() {
        float scale;
        float dx = 0;
        float dy = 0;
mShaderMatrix.set(null);
        if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
            scale = mDrawableRect.height() / (float) mBitmapHeight;
dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
} else {
            scale = mDrawableRect.width() / (float) mBitmapWidth;
dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
}

        mShaderMatrix.setScale(scale, scale);
mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);
mBitmapShader.setLocalMatrix(mShaderMatrix);
}

}

然後需要在values/attrs.xml中寫入以下程式碼：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CircleImageView">
        <attr name="border_width" format="dimension" />
        <attr name="border_color" format="color" />
    </declare-styleable>
</resources>

<com.view.CircleImageView
android:id="@+id/my_img"
android:layout_width="130dp"
android:layout_height="130dp"
android:layout_centerHorizontal="true"
android:src="@mipmap/head" />

這些都是自己在編寫專案的過程中的一些總結，有很多地方不能直接進行抄寫，只是提供一個思路讓大家參考下，主要還是自己記錄，有不足之處還望包含。

如有轉載，請表明出處。謝謝。