12.1

调用系统自带Carema

我们只需下面一席话语，即可调用系统相机，相机拍照后会返回一个intent给onActivityResult。 intent的extra部分包含一个编码过的Bitmap~

Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(it,Activity.DEFAULT_KEYS_DIALER);

//重写onActivityResult方法
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == Activity.RESULT_OK){
            Bundle bundle = data.getExtras();
            Bitmap bitmap = (Bitmap) bundle.get("data");
            img_show.setImageBitmap(bitmap);
        }
}

//定义一个保存图片的File变量
private File currentImageFile = null;

//在按钮点击事件处写上这些东西，这些是在SD卡创建图片文件的:
            @Override
            public void onClick(View v) {
                File dir = new File(Environment.getExternalStorageDirectory(),"pictures");
                if(dir.exists()){
                    dir.mkdirs();
                }
                currentImageFile = new File(dir,System.currentTimeMillis() + ".jpg");
                if(!currentImageFile.exists()){
                    try {
                        currentImageFile.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

                Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                it.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(currentImageFile));
                startActivityForResult(it, Activity.DEFAULT_KEYS_DIALER);
            }

//onActivityResult：
 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == Activity.DEFAULT_KEYS_DIALER) {
        img_show.setImageURI(Uri.fromFile(currentImageFile));
        }
}