android 拍照及本地获取图片，并显示
直接上代码，代码中注释挺多的。
拍照选择
//选择图片方式
public void showImagePickDialog() {
String title ="获取图片方式";
String[] choices =new String[]{"拍照","从手机中选择"};
new AlertDialog.Builder(this)
.setTitle(title)
.setItems(choices,new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, intwhich) {
dialog.dismiss();
switch (which) {
case 0://拍照
try {
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {//判断sd卡是否插入
//设置路径
mPhotoPath = Environment.getExternalStorageDirectory().getPath()
+ "//patrol//" +"//" + photoUtil.getPhotoFileName();
mPhotoFile =new File(mPhotoPath);
if (!mPhotoFile.exists()) {
mPhotoFile.createNewFile();
}
Intent intent =new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(intent,GET_IMAGE_BY_CAMERA);
}else {
appContext.showInfo("请插入SD卡");
}
} catch (Exceptione) {
}
break;
case 1://从手机选择
Intent intent2 =new Intent();
intent2.setType("image/*");
intent2.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent2,GET_IMAGE_FROM_PHONE);
break;
}
}
})
.setNegativeButton("返回",null)
.show();
}
/**
* 拍照返回
* 注意读取大图片时会停止程序，所以要对拍照或从本地读取的图片进行压缩。
* 拍照：bitmap.compress(CompressFormat.JPEG,30, fos);
* 本地图片：
*/
@SuppressWarnings("deprecation")
@Override
protected void onActivityResult(intrequestCode, intresultCode, Intent data) {
super.onActivityResult(requestCode,resultCode, data);
switch (requestCode) {
case GET_IMAGE_BY_CAMERA:
Bitmap bitmap =data.getParcelableExtra("data");
if(bitmap!=null){
try {
FileOutputStream fos =new FileOutputStream(mPhotoFile);
bitmap.compress(CompressFormat.JPEG, 30,fos);//30 是压缩率，表示压缩70%;如果不压缩是100，表示压缩率为0
fos.flush();
fos.close();
Bitmap newBitmap =photoUtil.rotaingImageView(photoUtil.readPictureDegree(mPhotoPath),bitmap);
circleImage.setImageBitmap(newBitmap);
String base64 =photoUtil.Bitmap2StrByBase64(newBitmap);
appContext.setCircleimageuri(base64);
mPhotoFile.delete();
} catch (IOExceptione) {
appContext.showInfo("获取图片失败");
}
}
break;
case GET_IMAGE_FROM_PHONE:
ContentResolver resolver =getContentResolver();
try {
Uri originalUri =data.getData();//获得图片的uri
//一。对图片进行压缩
BitmapFactory.Options options =new BitmapFactory.Options();
// 设置options.inJustDecodeBounds为true
options.inJustDecodeBounds =true;
// 节约内存
options.inPreferredConfig = Bitmap.Config.RGB_565;// 默认是Bitmap.Config.ARGB_8888
/* 下面两个字段需要组合使用 */
options.inPurgeable =true;
options.inInputShareable =true;
//此时不会把图片读入内存，只会获取图片宽高等信息
Bitmap bm = BitmapFactory.decodeStream(resolver.openInputStream(originalUri),null, options);
int heitht = options.outHeight;
Log.i("path","" + heitht);
// 根据需要设置压缩比例
int size = heitht / 800;
if (size <= 0) {
size = 1;
}
options.inSampleSize =size;
// 设置options.inJustDecodeBounds重新设置为false
options.inJustDecodeBounds =false;
//此时图片会按比例压缩后被载入内存中
bm = BitmapFactory.decodeStream(resolver.openInputStream(originalUri),null, options);
//bm =MediaStore.Images.Media.getBitmap(resolver, originalUri); //显得到bitmap图片
//二。获取图片的路径：
String[] proj = {MediaStore.Images.Media.DATA};
//好像是android多媒体数据库的封装接口，具体的看Android文档
Cursor cursor =managedQuery(originalUri, proj, null, null,null);
//按我个人理解这个是获得用户选择的图片的索引值
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
//将光标移至开头，这个很重要，不小心很容易引起越界
cursor.moveToFirst();
//最后根据索引值获取图片路径
String path =cursor.getString(column_index);
//三。调整图片的角度，显示出来并保存base64
Bitmap newBitmap =photoUtil.rotaingImageView(photoUtil.readPictureDegree(path),bm);
circleImage.setImageBitmap(newBitmap);
String base64 =photoUtil.Bitmap2StrByBase64(newBitmap);
appContext.setCircleimageuri(base64);
}catch (IOExceptione) {
appContext.showInfo("获取图片失败");
}
break;
default:
break;
}
}