Android拍照，读取相册

public class MainActivity extends Activity implements OnClickListener {    private Button btn_photo;    private Button btn_camare;    private ImageView img;    private static final int CAMARE = 999;    private static final int PHOTO = 888;    private static final int CAMARE_SD = 666;    private File imgFile;    private Uri imgUri;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initview();    }    private void initview() {        // TODO Auto-generated method stub        btn_photo = (Button)findViewById(R.id.btn_photo);        btn_camare = (Button)findViewById(R.id.btn_camare);        img = (ImageView)findViewById(R.id.img);                btn_camare.setOnClickListener(this);        btn_photo.setOnClickListener(this);        }

重写onActivityResult方法写好三个请求码

    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        // TODO Auto-generated method stub        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {

        case CAMARE:            if (requestCode == RESULT_CANCELED) {                Toast.makeText(this,"取消了拍照",Toast.LENGTH_SHORT).show();                return;            }            Bitmap camarebit = data.getParcelableExtra("data");            img.setImageBitmap(camarebit);                        break;

        case PHOTO:            if (resultCode==RESULT_OK) {                imgUri = data.getData();                img.setImageURI(imgUri);            }                                    break;

        case CAMARE_SD://          if (hasSDcard()) {//              img.setImageURI(imgUri);//              //          }            if (resultCode==RESULT_OK) {                String path = getPathFromUri(imgUri);                BitmapFactory.Options options = new BitmapFactory.Options();                options.inSampleSize=5;                Bitmap bit = BitmapFactory.decodeFile(path, options);                img.setImageBitmap(bit);                            }                        break;        }    }

点击事件

    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        switch (v.getId()) {        case R.id.btn_camare://          Intent in = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//          if (hasSDcard()) {//              File dir = getExternalCacheDir();//              imgFile = new File(dir,System.currentTimeMillis()+"avatar.png");//              imgUri = Uri.fromFile(imgFile);//              //              in.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);//              startActivityForResult(in, CAMARE_SD);//          }

intent 跳转到系统相机，给一个之前写好的请求码

            Intent camarein = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);            imgUri = creatUri();            getPathFromUri(imgUri);            camarein.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);            startActivityForResult(camarein,CAMARE_SD);                        break;                    case R.id.btn_photo:            Intent in = new Intent(Intent.ACTION_GET_CONTENT);            in.setType("img/*");            startActivityForResult(in,PHOTO);            break;        }    }

判断sd卡是否存在

    private boolean hasSDcard(){        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            return true;                    }else {            return false;        }                }

    private Uri creatUri() {            // TODO Auto-generated method stub        String imgName = System.currentTimeMillis()+"avatar.jepg";        ContentValues value = new ContentValues();        value.put(MediaStore.Images.Media.TITLE,imgName);        value.put(MediaStore.Images.Media.DISPLAY_NAME,imgName);        value.put(MediaStore.Images.Media.MIME_TYPE,imgName );        Uri uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,value);                                return uri;    }

获取 Uri 的方法

    private String getPathFromUri(Uri uri) {        // TODO Auto-generated method stub        if (uri!=null) {            String path = null;

先初始化path
获得uri的头
判断是File还是content

            String scheme = uri.getScheme();

            if (ContentResolver.SCHEME_FILE.equals(scheme)) {                path = uri.getPath();            }else if(ContentResolver.SCHEME_CONTENT.equals(scheme)){                Cursor cursor = getContentResolver().query(uri, new String[] {ImageColumns.DATA}, null,null,null);                if (cursor.moveToFirst()) {                    int index = cursor.getColumnIndex(ImageColumns.DATA);                    path = cursor.getString(index);                                    }                cursor.close();                }            return path;                    }        return null;    }}

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