佈局   一個ImageView用來顯示處理後的頭像,兩個按鈕  分別為呼叫相機、呼叫手機相簿

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_test_choose_touxiang"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="ht.testxyapp.com.testapp.activity.TestChooseTouxiang">
    <ImageView
android:id="@+id/imgTouXiang"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/circle_touxiang"/>
    <Button
android:id="@+id/btnChooseFromCamera"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="拍照上傳" />
    <Button
android:id="@+id/btnChooseFromXc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="相簿上傳" />
</LinearLayout>

然後是主activity

public class TestChooseTouxiang extends AppCompatActivity {
    private Button btnChooseFromCamera, getBtnChooseFromXc;
    private ImageView imgTouXiang;
/* 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),480 X 480的正方形。
private static int output_X = 600;
    private static int output_Y = 600;
@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_choose_touxiang);
imgTouXiang = (ImageView) findViewById(R.id.imgTouXiang);
btnChooseFromCamera = (Button) findViewById(R.id.btnChooseFromCamera);
getBtnChooseFromXc = (Button) findViewById(R.id.btnChooseFromXc);
btnChooseFromCamera.setOnClickListener(new View.OnClickListener() {
            @Override
public void onClick(View v) {
                choseHeadImageFromCameraCapture();
}
        });
getBtnChooseFromXc.setOnClickListener(new View.OnClickListener() {
            @Override
public void onClick(View v) {
                choseHeadImageFromGallery();
}
        });
}


    @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:
                Toast.makeText(this, "code--1", Toast.LENGTH_SHORT).show();
cropRawPhoto(intent.getData());
                break;
            case CODE_CAMERA_REQUEST:
                if (hasSdcard()) {
                    File tempFile = new File(
                            Environment.getExternalStorageDirectory(),
IMAGE_FILE_NAME);
String path = tempFile.getPath();
Toast.makeText(this, path+"89", Toast.LENGTH_SHORT).show();
cropRawPhoto(Uri.fromFile(tempFile));
} else {
                    Toast.makeText(getApplication(), "沒有SDCard!", Toast.LENGTH_LONG)
                            .show();
}
                break;
            case CODE_RESULT_REQUEST:
                Toast.makeText(this, "code--3", Toast.LENGTH_SHORT).show();
                if (intent != null) {
                    setImageToHeadView(intent);
}
                //Toast.makeText(this, "intent為null", Toast.LENGTH_SHORT).show();
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);
}

    //設定圖片作為頭像
private void setImageToHeadView(Intent intent) {
        PhotoUtil photoUtil = new PhotoUtil();
Bundle extras = intent.getExtras();
        if (extras != null) {
           // Toast.makeText(this, extras.getParcelable("data")+"*", Toast.LENGTH_SHORT).show();
Bitmap photo = extras.getParcelable("data");
photo = photoUtil.toRoundBitmap(photo);
imgTouXiang.setImageBitmap(photo);
}
    }


    // 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);
}

    // 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/*");//選擇圖片
intentFromGallery.setAction(Intent.ACTION_GET_CONTENT);
//如果你想在Activity中得到新開啟Activity關閉後返回的資料,
        //你需要使用系統提供的startActivityForResult(Intent intent,int requestCode)方法開啟新的Activity
startActivityForResult(intentFromGallery, CODE_GALLERY_REQUEST);
}

    /**
     * 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;
}
    }
}

其中設定圖片作為頭像方法中 有一個PhotoUtil 類  它主要用於將所選擇裁剪後的影象變為圓形 設定

這個類為:

public class PhotoUtil {
    public 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;
}
}

好了,到此就實現了,許可權需要加上儲存、讀取檔案的許可權

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

拿走即可使用!