我几天来一直在努力解决这个问题,似乎无法超越它。基本上我有一个活动,有3个图像视图,一个按钮启动相机意图
问题是,当我正在开发和运行调试器时,一切都运行得很好但不是当我单独运行应用程序(没有调试器,只是在手机上)接受图片预览后它只是显示黑屏并且在此之后什么都不做。
所需要的只是图片显示在图片视图中并保存到图库,它在调试模式下完成所有这些,但不是在我需要独立运行应用程序时。
我完全不知道这个问题 - 请有人/任何人帮助我。
我认为这可能是一个异步问题,但我对android很新,并且不知道如何实现这一点,在我脑海中并通过我已阅读/观看的教程 - 这应该是一个简单的过程,但我似乎无法得到它上班
这是我在活动布局上的代码:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".PhotoActivity">
<ImageView
android:id="@+id/imgPhoto1"
android:layout_width="236dp"
android:layout_height="136dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/dds_logo" />
<ImageView
android:id="@+id/imgPhoto2"
android:layout_width="236dp"
android:layout_height="136dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imgPhoto1"
app:srcCompat="@drawable/dds_logo" />
<ImageView
android:id="@+id/imgPhoto3"
android:layout_width="236dp"
android:layout_height="136dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imgPhoto2"
app:srcCompat="@drawable/dds_logo" />
<Button
android:id="@+id/btnTakePhoto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="52dp"
android:text="Take Photo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imgPhoto3"
app:layout_constraintVertical_bias="1.0" />
</android.support.constraint.ConstraintLayout>
以下是onClick事件的代码:
public void onClick(View v) {
try {
//respond to clicks
if (v.getId() == R.id.btnTakePhoto) {
captureImage();
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
这是对意图的调用:
private void captureImage() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePictureIntent, CAPTURE_IMAGE_REQUEST);
}
这是onActivityResult:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
try{
if (!Debug.isDebuggerConnected()){
Debug.waitForDebugger();
Log.d("debug", "started"); // Insert a breakpoint at this line!!
}
if(numPhotos < 2) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
String savedImageURL = MediaStore.Images.Media.insertImage(
getContentResolver(),
imageBitmap,
"Serial",
"Refresh Verification photo"
);
switch (numPhotos) {
case 0:
imgPhoto1.setImageBitmap(imageBitmap);
break;
case 1:
imgPhoto2.setImageBitmap(imageBitmap);
break;
case 2:
imgPhoto3.setImageBitmap(imageBitmap);
break;
}
numPhotos++;
}
else
{
numPhotos = 0;
Toast.makeText(PhotoActivity.this, "Max # of ohotos reached", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), MenuActivity.class);
startActivity(i);
finish();
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
美好的一天,
我设法解决了这个问题,因为相机拍摄的图像质量太高。
压缩图像后,一切正常(预览和保存),我唯一需要改变的是OnActivityResult方法:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
try {
Bundle extras = data.getExtras();
final Bitmap imageBitmap = (Bitmap) extras.get("data");
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 60, bytes);
byte[] byteArray = bytes.toByteArray();
final Bitmap compressedBitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
if (numPhotos < 3) {
switch (numPhotos) {
case 0:
imgPhoto1.setImageBitmap(compressedBitmap);
savebitmap(compressedBitmap);
numPhotos++;
break;
case 1:
imgPhoto2.setImageBitmap(compressedBitmap);
savebitmap(compressedBitmap);
numPhotos++;
break;
case 2:
imgPhoto3.setImageBitmap(compressedBitmap);
savebitmap(compressedBitmap);
numPhotos = 0;
Toast.makeText(PhotoActivity.this, "Max # of ohotos reached", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), MenuActivity.class);
startActivity(i);
finish();
break;
}
} else {
numPhotos = 0;
Toast.makeText(PhotoActivity.this, "Max # of ohotos reached", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), MenuActivity.class);
startActivity(i);
finish();
}
}
catch(Exception e){
e.printStackTrace();;
}
}
这是savebitmap方法:
public static File savebitmap(Bitmap bmp) throws IOException {
String date = new SimpleDateFormat("yyyyMMddHHmmss", Locale.getDefault()).format(new Date());
File folder = new File(Environment.getExternalStorageDirectory()
+ "/RefreshPhotos");
boolean var = false;
if (!folder.exists())
var = folder.mkdir();
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
File f = new File(folder
+ File.separator + "RefreshPhoto_" + date + ".png");
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
return f;
}