Question

以下活动拍摄照片，将其存储在存储中并将其显示在活动的ImageView中。当我点击一张照片并点击“确定”按钮时，会出现“很遗憾，相机已停止”的消息，并显示“相机活动”屏幕。未设置ImageView。单击的图像存储在存储中（使用文件资源管理器检查）

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>

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.kjsce.beproject.samarthan">

<uses-feature
    android:name="android.hardware.camera"
    android:required="true" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission
    android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    android:maxSdkVersion="18" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".Home" />
    <activity android:name=".Camera" />
    <activity android:name=".History"></activity>

    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.example.android.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true"
        android:readPermission="com.company.app.fileprovider.READ">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths"></meta-data>
    </provider>

</application>

</manifest>

file_paths.xml：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="Android/data/com.kjsce.beproject.samarthan/files/Pictures" />
</paths>

logcat的：

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
09-01 18:23:38.438 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan I/dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.view.WindowCallbackWrapper.onSearchRequested
09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to resolve interface method 14517: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan I/dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode
09-01 18:23:38.442 11159-11159/com.kjsce.beproject.samarthan W/dalvikvm: VFY: unable to resolve interface method 14521: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
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
09-01 18:23:38.506 11159-11159/com.kjsce.beproject.samarthan D/dalvikvm: VFY: replacing opcode 0x6f at 0x0007
09-01 18:23:38.518 11159-11159/com.kjsce.beproject.samarthan I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.widget.TintTypedArray.getChangingConfigurations
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
09-01 18:23:38.518 11159-11159/com.kjsce.beproject.samarthan D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
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
09-01 18:23:38.522 11159-11159/com.kjsce.beproject.samarthan D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
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
09-01 18:23:38.814 11159-11159/com.kjsce.beproject.samarthan D/libEGL: loaded /system/lib/egl/libEGL_genymotion.so
09-01 18:23:38.830 11159-11159/com.kjsce.beproject.samarthan D/libEGL: loaded /system/lib/egl/libGLESv1_CM_genymotion.so
09-01 18:23:38.834 11159-11159/com.kjsce.beproject.samarthan D/libEGL: loaded /system/lib/egl/libGLESv2_genymotion.so
09-01 18:23:38.866 11159-11159/com.kjsce.beproject.samarthan W/EGL_genymotion: eglSurfaceAttrib not implemented
09-01 18:23:38.874 11159-11159/com.kjsce.beproject.samarthan D/OpenGLRenderer: Enabling debug mode 0
09-01 18:23:38.962 11159-11159/com.kjsce.beproject.samarthan D/OpenGLRenderer: TextureCache::get: create texture(0xb9615438): name, size, mSize = 2, 4096, 4096
09-01 18:23:40.690 11159-11159/com.kjsce.beproject.samarthan W/EGL_genymotion: eglSurfaceAttrib not implemented
09-01 18:23:41.906 11159-11159/com.kjsce.beproject.samarthan D/dalvikvm: GC_FOR_ALLOC freed 47K, 3% free 11140K/11399K, paused 4ms, total 4ms
09-01 18:23:41.914 11159-11159/com.kjsce.beproject.samarthan D/OpenGLRenderer: TextureCache::flush: target size: 2457
09-01 18:23:41.914 11159-11159/com.kjsce.beproject.samarthan D/OpenGLRenderer: TextureCache::callback: name, removed size, mSize = 2, 4096, 0
09-01 18:23:46.990 11159-11159/com.kjsce.beproject.samarthan W/EGL_genymotion: eglSurfaceAttrib not implemented
09-01 18:23:46.994 11159-11159/com.kjsce.beproject.samarthan D/OpenGLRenderer: TextureCache::get: create texture(0xb9615438): name, size, mSize = 6, 4096, 4096

Answer 1

来自LogCat的信息未显示the Java stack trace associated with your crash，因此对您或我们无效。

其他问题包括：

您将mCurrentPhotoPath设置为"file:" + image.getAbsolutePath()，该值既不是文件系统路径也不是Uri。
如果您没有拍照（setPic()为photoFile），您正在致电null。
您在用户拍照前呼叫setPic()，因为startActivityForResult()是异步的。将setPic()来电转移到onActivityResult()，然后才会获得RESULT_OK（表示希望用户拍照）。

Answer 2

我没有看到你检查相机是否存在。在Commonsware上同上，你的日志不是崩溃。您似乎遵循官方文档。确保您的代码与theres完全相同，并在下面进行检查。

Android docs

import android.content.pm.PackageManager;

PackageManager pm = context.getPackageManager();

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

我个人使用

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

在某些设备上说如果你试图明确地访问后置摄像头，你仍然会崩溃（看着你的华硕nexus），但这超出了这个答案的范围。

我提到这一切，因为我看到你在模拟器上，访问sudo硬件非常有问题。

活动崩溃（文件处理和相机）

2 个答案: