Android如何实现拍照或者选取本地图片

这篇文章主要介绍Android如何实现拍照或者选取本地图片，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

具体内容如下

总体流程

从selectPhotoActivity中启动图册或者相机，再根据获取的uri进行裁剪，返回uri，再对这个uri执行一系列操纵。

从相册选取图片

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);    }

使用隐式intent启动相机。

拍照获取图片

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();        }    }

值得注意的一点是，intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, takePhoto)中，设置了拍完照照片的存放路径takePhoto，在此情况下，部分机型的onActivityResult()中不会返回数据，即data.getData()为空，因为可以根据存放路径即可获取拍照图片。

裁剪图片

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());    }

整体代码

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());    }}

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