Andoroid进阶--底部图片选择Dialog
业务需要选择弹出对话框，然后点击选择图片。网上已经有了很多，不过感觉写的有点乱。自己这里总结一下，有需要开发者可以按照如下步骤直接使用即可。
1.效果图如下
点击选择照相后，弹出如下选择对话框：
2. Dialog实现
- 布局
"http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
"@+id/abroad_takephoto"
android:layout_width="match_parent"
android:layout_height="@dimen/abroad_dialog_item_hight"
android:background="@drawable/abroad_dialogitem_selector"
android:gravity="center"
android:text="@string/abroad_photo"
android:textColor="@color/abroad_dialog_textcolor"
android:textSize="@dimen/abroad_dialog_textsize" />
"match_parent"
android:layout_height="@dimen/abroad_dialog_view_hight"
android:background="@color/abroad_dialog_view_bg" />
"@+id/abroad_choosephoto"
android:layout_width="match_parent"
android:layout_height="@dimen/abroad_dialog_item_hight"
android:background="@drawable/abroad_dialogitem_selector"
android:gravity="center"
android:text="@string/abroad_choosephotp"
android:textColor="@color/abroad_dialog_textcolor"
android:textSize="@dimen/abroad_dialog_textsize" />
"@+id/abroad_choose_cancel"
android:layout_width="match_parent"
android:layout_height="@dimen/abroad_dialog_item_hight"
android:layout_marginTop="@dimen/abroad_feedback_top"
android:background="@drawable/abroad_dialogitem_selector"
android:gravity="center"
android:text="@string/abroad_cancel"
android:textColor="@color/abroad_dialog_textcolor"
android:textSize="@dimen/abroad_dialog_textsize" />
</LinearLayout> 上面的高度和颜色,文字：
<color name="abroad_dialog_item">#ffffffcolor>
<color name="abroad_dialog_item_press">#dfdfdfcolor>
<color name="abroad_dialog_textcolor">#222222color>
<color name="abroad_dialog_view_bg">#cccccccolor>
<dimen name="abroad_dialog_item_hight">45dpdimen>
<dimen name="abroad_feedback_top">8dpdimen>
<dimen name="abroad_dialog_textsize">18spdimen>
<string name="abroad_photo">拍照string>
<string name="abroad_choosephotp">从相册选择string>
<string name="abroad_cancel">取消string>控件selector
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/abroad_dialog_item_press" android:state_pressed="true" />
<item android:drawable="@color/abroad_dialog_item" />
selector>Dialog 创建
在style文件里面添加主题及dialog弹出动画
dialog创建
private TextView cancel; private TextView takePhoto; private TextView choosePhoto; private Dialog dialog; public void chosePhotoDialog() { dialog = new Dialog(this, R.style.ActionSheetDialogStyle); inflate = LayoutInflater.from(this).inflate(R.layout.view_abroad_choosephoto_dialog, null); choosePhoto = (TextView) inflate.findViewById(R.id.abroad_choosephoto); takePhoto = (TextView) inflate.findViewById(R.id.abroad_takephoto); cancel = (TextView) inflate.findViewById(R.id.abroad_choose_cancel); choosePhoto.setOnClickListener(this); takePhoto.setOnClickListener(this); cancel.setOnClickListener(this); dialog.setContentView(inflate); Window window = dialog.getWindow(); if (dialog != null && window != null) { window.getDecorView().setPadding(0, 0, 0, 0); WindowManager.LayoutParams attr = window.getAttributes(); if (attr != null) { attr.height = ViewGroup.LayoutParams.WRAP_CONTENT; attr.width = ViewGroup.LayoutParams.MATCH_PARENT; attr.gravity = Gravity.BOTTOM;//设置dialog 在布局中的位置 window.setAttributes(attr); } } dialog.show(); }Dialig 点击事件
@Override public void onClick(View view) { switch (view.getId()) { case R.id.abroad_choosephoto: pickAlbum(); break; case R.id.abroad_takephoto: takePhotos(); break; case R.id.abroad_choose_cancel: dialog.dismiss(); } dialog.dismiss(); }
3. 选择图片
- 定义事件类型
private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
private static final int PHOTO_REQUEST_CUT = 3;// 结果- 从相册选取图片
/***
* 进入系统相册界面
*/
private void pickAlbum() {
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
}- 手机拍照后选取图片
protected void takePhotos() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
}
- 图片选择后，最终都会把数据返回到onActivityResult（）方法里面，所以我们需要在activity里面重写此方法
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case PHOTO_REQUEST_GALLERY:
if (data != null) {
Uri uri = handleImage(data);
cropPhoto(uri);
}
break;
case PHOTO_REQUEST_CAREMA:
if (resultCode == RESULT_CANCELED) {
return;
}
if (data != null) {
Bitmap photo = data.getParcelableExtra("data");
//将Bitmap转化为uri
Uri uri = saveBitmap(photo, "temp");
//启动图像裁剪
cropPhoto(uri);
}
break;
case PHOTO_REQUEST_CUT:
LogUtil.d("abroadUseActivity2", "裁剪");
// 从剪切图片返回的数据
if (data == null) {
return;
}
bitmap = data.getParcelableExtra("data");
if (bitmap == null) {//
return;
}
// TODO 此处我们便获得了bitmap对象，做其他操作
bitmap.recycle();
break;
default:
break;
}
super.onActivityResult(requestCode, resultCode, data);
}- 裁剪的方法
private void cropPhoto(Uri uri) {
// 裁剪图片意图
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
// 裁剪框的比例，1：1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// 裁剪后输出图片的尺寸大小
intent.putExtra("outputX", 250);
intent.putExtra("outputY", 250);
intent.putExtra("outputFormat", "JPEG");// 图片格式
intent.putExtra("noFaceDetection", true);// 取消人脸识别
intent.putExtra("return-data", true);
// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
startActivityForResult(intent, PHOTO_REQUEST_CUT);
}- 拍照后需要先把数据保存一个临时的文件，然后再获取文件，才能裁剪
/**
* 把bitmap保存到本地
*
* @param bm bitmap
* @param dirPath 路径
* @return 文件的uri
*/
private Uri saveBitmap(Bitmap bm, String dirPath) {
//新建文件夹用于存放裁剪后的图片
File tmpDir = new File(Environment.getExternalStorageDirectory() + "/" + dirPath);
if (!tmpDir.exists()) {
tmpDir.mkdir();
}
//新建文件存储裁剪后的图片
File img = new File(tmpDir.getAbsolutePath() + "/feedback.png");
try {
//打开文件输出流
FileOutputStream fos = new FileOutputStream(img);
//将bitmap压缩后写入输出流(参数依次为图片格式、图片质量和输出流)
bm.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
//返回File类型的Uri
return Uri.fromFile(img);
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}4.注意事项
- 本来选择后不打算裁剪，但是在小米6等手机上，不裁剪容易崩溃，而裁剪的另一个好处就是压缩图片
- 在我们获取bitmap后，可以在那里做一些业务操作，但是一定要记得把bitmap文件回收，不然容易导致内存泄漏