我正在制作一个活动，其中有一个按钮，当用户点击弹出窗口时，会出现从图库中选择图像并在按钮上方显示之后显示的图像。我想出了一种从图库中获取图像的方法，但它并没有显示在图像视图中。另外，如果我按下跳过，我无法找到设置默认图片的方法。什么是将所选图像存储在数据库中的好选择？
imagePicker.java
public class imagePicker extends AppCompatActivity {
private static int RESULT_LOAD_IMAGE = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_picker);
Typeface tf = Typeface.createFromAsset(getAssets(),
"fonts/Psilly.otf");
TextView tv = (TextView) findViewById(R.id.select);
tv.setTypeface(tf);
tv.setText("Set Your Profile Picture");
}
public void choose(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Picture"), RESULT_LOAD_IMAGE);
}
public void chats(View view) {
Intent i = new Intent(this, Chats.class);
startActivity(i);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
ImageView imageView = (ImageView) findViewById(R.id.galpic);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
}
}
xml文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.nagpal.karan.radarchat.imagePicker"
android:background="@color/white">
<ImageView
android:layout_width="250dp"
android:layout_height="200dp"
android:background="@drawable/pic_stroke"
android:id="@+id/galpic"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="130dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Choose from gallery"
android:id="@+id/gallery"
android:background="@drawable/button_shape"
android:textSize="18dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="140dp"
android:onClick="choose"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Skip >"
android:id="@+id/skip"
android:textSize="18dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:background="@drawable/button_shape"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="70dp"
android:onClick="chats"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Set Your Profile Picture"
android:id="@+id/select"
android:textSize="25dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp" />
</RelativeLayout>
pic_stroke.xml：
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/white" />
<stroke android:width="3dp" android:color="@android:color/black" />
</shape>
答案 0 :(得分：0)
您是否已将以下内容添加到AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
答案 1 :(得分：0)
将您的选择方法更改为： -
public void choose(View view)
{
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(Intent.createChooser(intent,"Select Picture"), RESULT_LOAD_IMAGE);
}
并添加清单
的权限<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
对于默认图像将其放在资源可绘制中并从那里加载它。您应该将图像保存在缓存中。 android中有varoius缓存选项。
答案 2 :(得分：0)
private void showDialog()
{
try {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Please select Profile picture");
builder.setPositiveButton("Gallery", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
pickProfilePicFromGallary();
dialog.dismiss();
}
});
builder.setNegativeButton("Camera", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
pickProfilePicFromCamera();
dialog.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
} catch (Exception e) {
e.printStackTrace();
}
}
private void pickProfilePicFromGallary() {
try {
Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, GALLARY);
} catch (Exception e) {
e.printStackTrace();
}
}
private void pickProfilePicFromCamera() {
try {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp1.jpg");
mImageCaptureUri = Uri.fromFile(f);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
startActivityForResult(intent, CAMERA);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
try {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GALLARY && resultCode == getActivity().RESULT_OK && null != data) {
Uri selectedImage = data.getData();
performCrop(selectedImage);
} else if (requestCode == CAMERA && resultCode == getActivity().RESULT_OK) {
CropingIMG();
} else if (requestCode == CAMERA_CROP) {
try {
if (outPutFile.exists()) {
Bitmap photo = decodeFile(outPutFile);
ivProfile.setImageBitmap(photo);
filepathForLOGO = getRealPathFromURI(Uri.fromFile(outPutFile));
try {
base64LOGO = GlobalMethod
.getBase64FromByteArray(GlobalMethod
.convertFileToByteArray(new File(
filepathForLOGO)));
} catch (Exception e) {
e.printStackTrace();
}
} else {
AlertDialogUtility.showToast(getActivity(), "Error while save image");
}
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == GALLARY_CROP) {
File imageFile = new File(makeDir(), "ABC.png");
if (imageFile.exists()) {
String imagePath = imageFile.getAbsolutePath();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap thePic = BitmapFactory.decodeFile(imagePath, options);
options.inSampleSize = 2;
options.inJustDecodeBounds = false;
thePic = BitmapFactory.decodeFile(imagePath, options);
ivProfile.setImageBitmap(thePic);
filepathForLOGO = getRealPathFromURI(getImageUri(getActivity(), thePic));
try {
base64LOGO = GlobalMethod
.getBase64FromByteArray(GlobalMethod
.convertFileToByteArray(new File(
filepathForLOGO)));
} catch (Exception e) {
e.printStackTrace();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public Uri getImageUri(Context inContext, Bitmap inImage)
{
try {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
} catch (Exception e) {
e.printStackTrace();
}
return null ;
}
private Bitmap decodeFile(File f) {
try {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 512;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
return null;
}
public static String getBase64FromByteArray(byte[] byteArray) {
String base64 = "";
try {
System.gc();
base64 = com.shantiniketan.Utils.Base64
.encodeBytes(byteArray);
} catch (Exception e) {
e.printStackTrace();
return null;
}
return base64;
}
public static byte[] convertFileToByteArray(File file) throws Exception {
ByteArrayOutputStream baos = null;
try {
FileInputStream fis = new FileInputStream(file);
baos = new ByteArrayOutputStream();
System.gc();
// Log.d("TAG", "::::: " + file.length());
int fileSize = (int) file.length();
byte[] buff = new byte[fileSize];
int i = Integer.MAX_VALUE;
while ((i = fis.read(buff, 0, buff.length)) > 0) {
baos.write(buff, 0, i);
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return baos.toByteArray(); // be sure to close InputStream in calling
// function
}