Java 活动崩溃（文件处理和摄像头）_Java_Android_Android Camera Intent

Java 活动崩溃（文件处理和摄像头）

java android

Java 活动崩溃（文件处理和摄像头）,java,android,android-camera-intent,Java,Android,Android Camera Intent,以下活动拍摄照片，将其存储在存储器中，并将其显示在活动的ImageView中。当我点击一张照片并点击OK按钮时，会出现一条消息“不幸的是，相机已停止”，并显示相机活动屏幕。未设置ImageView。单击的图像存储在存储器中（使用文件资源管理器进行检查） Camera.java public class Camera extends AppCompatActivity { static final int REQUEST_TAKE_PHOTO = 1; String mCurrentPhotoP

以下活动拍摄照片，将其存储在存储器中，并将其显示在活动的ImageView中。当我点击一张照片并点击OK按钮时，会出现一条消息“不幸的是，相机已停止”，并显示相机活动屏幕。未设置ImageView。单击的图像存储在存储器中（使用文件资源管理器进行检查）

Camera.java

public class Camera extends AppCompatActivity {

static final int REQUEST_TAKE_PHOTO = 1;
String mCurrentPhotoPath;
ImageView ivCaptured;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_camera);
    ivCaptured = (ImageView) findViewById(R.id.ivCaptured);
    dispatchTakePictureIntent();
}

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(Camera.this, "com.example.android.fileprovider", photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
        //galleryAddPic();
        setPic();
    }
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );
    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    return image;
}

/*private void galleryAddPic() {
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    File f = new File(mCurrentPhotoPath);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    this.sendBroadcast(mediaScanIntent);
}*/

private void setPic() {
    // Get the dimensions of the View
    int targetW = ivCaptured.getLayoutParams().width;
    int targetH = ivCaptured.getLayoutParams().height;

    // Get the dimensions of the bitmap
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
    int photoW = bmOptions.outWidth;
    int photoH = bmOptions.outWidth;

    // Determine how much to scale down the image
    int scaleFactor = Math.min(photoW / targetW, photoH / targetH);

    // Decode the image file into a Bitmap sized to fill the View
    bmOptions.inJustDecodeBounds = false;
    bmOptions.inSampleSize = scaleFactor;
    bmOptions.inPurgeable = true;

    Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
    ivCaptured.setImageBitmap(bitmap);
}
}

activity_camera.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">

<ImageView
    android:layout_width="250dp"
    android:layout_height="250dp"
    android:id="@+id/ivCaptured"
    android:src="@drawable/photo"
    android:baselineAlignBottom="false" />

</LinearLayout>

来自LogCat的信息不显示，因此对您或我们都没有帮助

其他问题包括：

您正在将
```
mCurrentPhotoPath
```
设置为
```
文件：“+image.getAbsolutePath（）
```
，该值既不是文件系统路径，也不是
```
Uri
```
如果不拍照（如果
```
photoFile
```
为
```
null
```
），则调用
```
setPic（）
```


在用户拍照之前调用setPic（）
，因为startActivityForResult（）
是异步的。将您的setPic（）
调用移动到onActivityResult（）
，然后仅当您得到结果\u OK
（表示希望用户拍了一张照片）
您从LogCat获得的信息不会显示，因此对您或我们都没有帮助
其他问题包括：

您正在将mCurrentPhotoPath
设置为文件：“+image.getAbsolutePath（）
，该值既不是文件系统路径，也不是Uri

如果不拍照（如果photoFile
为null
），则调用setPic（）

在用户拍照之前调用setPic（）
，因为startActivityForResult（）
是异步的。将您的setPic（）
调用移动到onActivityResult（）
，然后仅当您得到结果\u OK
（表示希望用户拍了一张照片）
我看不到你在检查摄像机是否存在。同样在Commonware上，您的日志不是崩溃。你好像在跟踪官方文件。确保您的代码与下面的检查完全相同

我个人使用
int numCameras = Camera.getNumberOfCameras();
if (numCameras > 0) {
  hasCamera = true;
}

也就是说，在某些设备上，如果你试图明确访问后置摄像头，你仍然会崩溃（看看你的华硕nexus），但这超出了这个答案的范围
我提到这一切是因为我看到你在一个模拟器上，这对于访问sudo硬件是非常有问题的。
我没有看到你检查相机是否存在。同样在Commonware上，您的日志不是崩溃。你好像在跟踪官方文件。确保您的代码与下面的检查完全相同

我个人使用
int numCameras = Camera.getNumberOfCameras();
if (numCameras > 0) {
  hasCamera = true;
}

也就是说，在某些设备上，如果你试图明确访问后置摄像头，你仍然会崩溃（看看你的华硕nexus），但这超出了这个答案的范围
我提到了所有这些，因为我看到您在一个模拟器上，这对于访问sudo硬件来说是非常有问题的。请从您的logcat显示stacktrace。请从您的logcat显示stacktrace。
09-01 18:23:38.278 11159-11159/? D/dalvikvm: Late-enabling CheckJNI
09-01 18:23:38.378 11159-11159/com.kjsce.beproject.samarthan I/ActivityThread: Pub com.example.android.fileprovider: android.support.v4.content.FileProvider
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09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to resolve interface method 14517: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
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09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
09-01 18:23:38.494 11159-11159/com.kjsce.beproject.samarthan I/dalvikvm: Could not find method android.view.ViewGroup.onRtlPropertiesChanged, referenced from method android.support.v7.widget.Toolbar.onRtlPropertiesChanged
09-01 18:23:38.494 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to resolve virtual method 14417: Landroid/view/ViewGroup;.onRtlPropertiesChanged (I)V
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09-01 18:23:38.518 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to resolve virtual method 407: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
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09-01 18:23:38.522 11159-11159/com.kjsce.beproject.samarthan I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.widget.TintTypedArray.getType
09-01 18:23:38.522 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to resolve virtual method 429: Landroid/content/res/TypedArray;.getType (I)I
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09-01 18:23:38.778 11159-11163/com.kjsce.beproject.samarthan D/dalvikvm: GC_CONCURRENT freed 207K, 3% free 10939K/11271K, paused 151ms+1ms, total 214ms
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import android.content.pm.PackageManager;

PackageManager pm = context.getPackageManager();

if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
}

int numCameras = Camera.getNumberOfCameras();
if (numCameras > 0) {
  hasCamera = true;
}