Java Android程序崩溃NullPoint异常
嘿，我已经试着解决这个问题好几个小时了，并且广泛地检查了很多其他问题，试图解决这个问题 所以在我的主要活动中，我有两个活动，要么从画廊中抓取一张图片，要么是一张照片，具体取决于按钮Java Android程序崩溃NullPoint异常,java,android,nullpointerexception,crash,Java,Android,Nullpointerexception,Crash,嘿，我已经试着解决这个问题好几个小时了，并且广泛地检查了很多其他问题，试图解决这个问题 所以在我的主要活动中，我有两个活动，要么从画廊中抓取一张图片，要么是一张照片，具体取决于按钮 public void DoTakePhoto(View v) { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (intent.resolveActivity(getPackageManager())
public void DoTakePhoto(View v) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(intent, TAKE_PICTURE);
}
}
public void DoShowSelectImage(View v) {
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, SELECT_PICTURE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SELECT_PICTURE || requestCode == TAKE_PICTURE && null != data) {
if (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]);
mImageFullPathAndName = cursor.getString(columnIndex);
cursor.close();
jobID = "";
File file = new File(mImageFullPathAndName);
Bitmap mCurrentSelectedBitmap = decodeFile(file);
if (mCurrentSelectedBitmap != null) {
ivSelectedImg.setImageBitmap(mCurrentSelectedBitmap);
int w = mCurrentSelectedBitmap.getWidth();
int h = mCurrentSelectedBitmap.getHeight();
int length = (w > h) ? w : h;
if (length > OPTIMIZED_LENGTH) {
float ratio = (float) w / h;
int newW, newH = 0;
if (ratio > 1.0) {
newW = OPTIMIZED_LENGTH;
newH = (int) (OPTIMIZED_LENGTH / ratio);
} else {
newH = OPTIMIZED_LENGTH;
newW = (int) (OPTIMIZED_LENGTH * ratio);
}
mCurrentSelectedBitmap = rescaleBitmap(mCurrentSelectedBitmap, newW, newH);
}
mImageFullPathAndName = SaveImage(mCurrentSelectedBitmap);
}
}
}
}
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.zola.capchem/com.example.zola.capchem.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference
我在这个网站上尝试了很多东西，但应用程序最终还是崩溃了。不知道该在这里做什么。如果您试图从相机拍照，代码将崩溃 通过相机拍摄照片和从gallery/文件系统获取照片的方法完全不同 为了做到这两个，你用一个动作和一些额外的动作来激发一个意图。您为此目的启动了一项活动。结果将通过传递给它的意图在onActivityResult（）中返回给您 但是，存储在返回的意图中的结果对于这两种情况都是不同的。 1） 通过相机拍摄照片：拍摄图像的位图本身会返回给您，作为intent bundle中的额外内容。您可以通过以下方式访问它：
Bundle extras = data.getExtras();
Bitmap bitmap = (Bitmap) extras.get("data");
//use bitmap however you like...
private URI getTempFile()
{
if (isExternalStorageWritable())
{
File file = new File(Environment.getExternalStorageDirectory(), "temporary_file.jpg");
try
{
if(!file.exists())
{
file.createNewFile();
}
} catch (IOException e)
{
}
return Uri.fromFile(file);
} else
{
return null;
}
}
public void DoShowSelectImage(View v) {
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
i.putExtra(MediaStore.EXTRA_OUTPUT, getTempFile());
startActivityForResult(i, SELECT_PICTURE);
}
Uri selectedimage = data.getData();
if(selectedimage == null)
{
selectedimage = getTempFile();
}
if(result == RESULT_OK && data != null)
{
Bitmap mCurrentSelectedBitmap;
if(requestCode == SELECT_PICTURE)
{
Uri selectedimage = data.getData();
if(selectedimage == null)
{
selectedimage = getTempFile();
}
......
......
mCurrentSelectedBitmap = decodeFile(file);
}
else if(requestCode == TAKE_PICTURE)
{
Bundle extras = data.getExtras();
mCurrentSelectedBitmap = (Bitmap) extras.get("data");
}
.......
.......
//Do your thing
}
Uri selectedimage = data.getData();
if(selectedimage == null)
{
selectedimage = getTempFile();
}
if(result == RESULT_OK && data != null)
{
Bitmap mCurrentSelectedBitmap;
if(requestCode == SELECT_PICTURE)
{
Uri selectedimage = data.getData();
if(selectedimage == null)
{
selectedimage = getTempFile();
}
......
......
mCurrentSelectedBitmap = decodeFile(file);
}
else if(requestCode == TAKE_PICTURE)
{
Bundle extras = data.getExtras();
mCurrentSelectedBitmap = (Bitmap) extras.get("data");
}
.......
.......
//Do your thing
}
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />