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：
这里写图片描述
2. Dialog实现
- 布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+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" />
<View
android:layout_width="match_parent"
android:layout_height="@dimen/abroad_dialog_view_hight"
android:background="@color/abroad_dialog_view_bg" />
<TextView
android:id="@+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" />
<TextView
android:id="@+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">#ffffff</color>
<color name="abroad_dialog_item_press">#dfdfdf</color>
<color name="abroad_dialog_textcolor">#222222</color>
<color name="abroad_dialog_view_bg">#cccccc</color>
<dimen name="abroad_dialog_item_hight">45dp</dimen>
<dimen name="abroad_feedback_top">8dp</dimen>
<dimen name="abroad_dialog_textsize">18sp</dimen>
<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
<?xml version="1.0" encoding="utf-8"?>
<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
<style name="ActionSheetDialogStyle" parent="@android:style/Theme.Dialog"> <!-- 背景透明 --> <item name="android:windowBackground">@android:color/transparent</item> <item name="android:windowContentOverlay">@null</item> <!-- 浮于Activity之上 --> <item name="android:windowIsFloating">true</item> <!-- 边框 --> <item name="android:windowFrame">@null</item> <!-- Dialog以外的区域模糊效果 --> <item name="android:backgroundDimEnabled">true</item> <!-- 无标题 --> <item name="android:windowNoTitle">true</item> <!-- 半透明 --> <item name="android:windowIsTranslucent">true</item> <!-- Dialog进入及退出动画 --> <item name="android:windowAnimationStyle">@style/style_inner_map_dialog_animation</item>
<style name="style_inner_map_dialog_animation">
<item name="android:windowEnterAnimation">@anim/scale_alpha_to_enter</item>
<item name="android:windowExitAnimation">@anim/scale_alpha_to_exit</item>
</style>
* dialog创建
``` java
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
