Android实现拍照或者选取本地图片

private void pickPhoto() {
        Intent intent = new Intent(Intent.ACTioN_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO);
    }

private void takePhoto() {
        // 执行拍照前，应该先判断SD卡是否存在
        String SDState = Environment.getExternalStorageState();
        if (SDState.equals(Environment.MEDIA_MOUNTED)) {
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// "android.media.action.IMAGE_CAPTURE"
            File path = Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
            File file = new File(path, IMAGE_FILE_NAME);
            takePhoto = Uri.fromFile(file);
            intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, takePhoto);
            startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);
        } else {
            Toast.makeText(getApplicationContext(), "内存卡不存在",
                    Toast.LENGTH_SHORT).show();
        }
    }

public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image
    public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = { column };
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

public class selectPhotoActivity extends Activity implements View.OnClickListener{

    
    public static final int SELECT_PIC_BY_TACK_PHOTO = 1;
    
    public static final int SELECT_PIC_BY_PICK_PHOTO = 2;
    
    private static final int RESULT_REQUEST_CODE = 3;
    
    private Button btn_take_photo;
    
    private Button btn_pick_photo;
    
    private Button btn_cancel;
    
    private static final String IMAGE_FILE_NAME = "image.jpg";
    
    private String picPath;
    //保存裁剪后的图像
    private Bitmap photo;
    private Intent lastIntent;
    private Uri takePhoto;
    
    public static final String KEY_PHOTO_PATH = "photo_path";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_photo);

        btn_take_photo = (Button) findViewById(R.id.btn_take_photo);
        btn_pick_photo = (Button) findViewById(R.id.btn_pick_photo);
        btn_cancel = (Button) findViewById(R.id.btn_cancel);

        lastIntent = getIntent();

        btn_take_photo.setOnClickListener(this);
        btn_pick_photo.setOnClickListener(this);
        btn_cancel.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_take_photo : // 开启相机
                takePhoto();
                break;
            case R.id.btn_pick_photo : // 开启图册
                pickPhoto();
                break;
            case R.id.btn_cancel : // 取消操作
                this.finish();
                break;
            default :
                break;
        }
    }

    
    private void takePhoto() {
        // 执行拍照前，应该先判断SD卡是否存在
        String SDState = Environment.getExternalStorageState();
        if (SDState.equals(Environment.MEDIA_MOUNTED)) {
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// "android.media.action.IMAGE_CAPTURE"
            File path = Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
            File file = new File(path, IMAGE_FILE_NAME);
            takePhoto = Uri.fromFile(file);
            intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, takePhoto);
            startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);
        } else {
            Toast.makeText(getApplicationContext(), "内存卡不存在",
                    Toast.LENGTH_SHORT).show();
        }
    }

    
    private void pickPhoto() {
        Intent intent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        finish();
        return super.onTouchEvent(event);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_OK) {
            Log.e("TAG","ActivityResult resultCode error");
            return;
        }

        switch (requestCode){
            case SELECT_PIC_BY_PICK_PHOTO:
                Uri uri = data.getData();
                if (!TextUtils.isEmpty(uri.getAuthority())) {
                    //查询选择图片
                    Cursor cursor = getContentResolver().query(
                        uri,
                        new String[] { MediaStore.Images.Media.DATA },
                        null,
                        null,
                        null);
                    //返回 没找到选择图片
                    if (null == cursor) {
                        return;
                    }
                    //光标移动至开头 获取图片路径
                    cursor.moveToFirst();
                    picPath = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Images.Media.DATA));
                    Log.d("图片路径啊啊啊啊啊啊",picPath);
                }
                break;
            case SELECT_PIC_BY_TACK_PHOTO:
                //裁剪图片
                startPhotoZoom(takePhoto);
                break;
            case RESULT_REQUEST_CODE :
                if (data != null) {
                    Log.d("图片路径",data.getData().toString());
                    picPath = getPathByUri4kitkat(getApplicationContext(),data.getData());
                    Log.d("图片路径啊啊啊啊啊啊",picPath);
                }
                break;
        }
        if(requestCode != SELECT_PIC_BY_TACK_PHOTO) {
            lastIntent.putExtra(KEY_PHOTO_PATH, picPath);
            setResult(Activity.RESULT_OK, lastIntent);
            finish();
        }
        super.onActivityResult(requestCode, resultCode, data);

    }

    
    public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image
    public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = { column };
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

}