1.建立頁面簡單佈局demo.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.takephoto.MainActivity" >

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="takePhone"
        android:text="拍照" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="choosePhone"
        android:text="相簿選擇" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="centerCrop"
        android:src="@drawable/ic_launcher" />

</LinearLayout>
 

2.Activity整體程式碼

/**
 * 相簿的選擇
 * 
 * @author Sugar
 * 
 */
@SuppressLint("Override")
public class DemoActivity extends FragmentActivity {
    private static final int CROP_PHOTO = 2;
    private static final int PICK_PIC = 3;

    private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE1 = 4;
    private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE2 = 5;
    private File output;
    private Uri imageUri;
    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.demo);
        imageView = (ImageView) findViewById(R.id.image);
    }

    /**
     * 相機
     * 
     * @param view
     */
    public void takePhone(View view) {
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat
                    .requestPermissions(
                            this,
                            new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE },
                            MY_PERMISSIONS_REQUEST_CALL_PHONE2);

        } else {
            takePhoto();
        }

    }

    /**
     * 相簿
     * 
     * @param view
     */
    public void choosePhone(View view) {
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat
                    .requestPermissions(
                            this,
                            new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE },
                            MY_PERMISSIONS_REQUEST_CALL_PHONE2);

        } else {
            choosePhoto();
        }
    }

    /**
     * 拍照
     */
    private void takePhoto() {
        /**
         * 最後一個引數是資料夾的名稱，可以隨便起
         */
        File file = new File(Environment.getExternalStorageDirectory(), "拍照");
        if (!file.exists()) {
            file.mkdir();
        }
        /**
         * 這裡將時間作為不同照片的名稱
         */
        output = new File(file, System.currentTimeMillis() + ".jpg");

        /**
         * 如果該資料夾已經存在，則刪除它，否則建立一個
         */
        try {
            if (output.exists()) {
                output.delete();
            }
            output.createNewFile();
        } catch (Exception e) {
            e.printStackTrace();
        }
        /**
         * 隱式開啟拍照的Activity，並且傳入CROP_PHOTO常量作為拍照結束後回撥的標誌
         */
        imageUri = Uri.fromFile(output);
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        startActivityForResult(intent, CROP_PHOTO);

    }

    /**
     * 從相簿選取圖片
     */
    private void choosePhoto() {
        /**
         * 開啟選擇圖片的介面
         */
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");// 相片型別
        startActivityForResult(intent, PICK_PIC);

    }

    /**
     * 呼叫相簿和拍照之後的返回
     */
    public void onActivityResult(int req, int res, Intent data) {
        switch (req) {
        /**
         * 拍照的請求標誌
         */
        case CROP_PHOTO:
            if (res == RESULT_OK) {
                try {
                    /**
                     * 該uri就是照片資料夾對應的uri
                     */
                    Bitmap bit = BitmapFactory
                            .decodeStream(getContentResolver().openInputStream(
                                    imageUri));
                    imageView.setImageBitmap(bit);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            break;
        /**
         * 從相簿中選取圖片的請求標誌
         */

        case PICK_PIC:
            if (res == RESULT_OK) {
                try {
                    /**
                     * 該uri是上一個Activity返回的
                     */
                    Uri uri = data.getData();
                    Bitmap bit = BitmapFactory
                            .decodeStream(getContentResolver().openInputStream(
                                    uri));
                    imageView.setImageBitmap(bit);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            break;

        default:
            break;
        }
    }

    /**
     * 動態許可權
     */
    @Override
    public void onRequestPermissionsResult(int requestCode,
            String[] permissions, int[] grantResults) {

        if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE1) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                takePhoto();
            } else {
                // Permission Denied
                Toast.makeText(DemoActivity.this, "Permission Denied",
                        Toast.LENGTH_SHORT).show();
            }
        }

        if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE2) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            } else {
                // Permission Denied
                Toast.makeText(DemoActivity.this, "Permission Denied",
                        Toast.LENGTH_SHORT).show();
            }
        }
    }
}
 

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