活动崩溃（文件处理和相机）

Question

以下活动拍摄一张照片，将其存储在存储器中并显示在活动的ImageView中。当我点击一张照片并点击好的按钮时，会出现一条消息'不幸的是，相机已经停止'并显示相机活动屏幕。 ImageView未设置。点击保存在存储的图像（经过与文件浏览）

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> 

的logcat：

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

从logcat的您的个人资料没有显示the Java stack trace associated with your crash，所以它不会帮你还是我们的。

的其他问题包括：

• 要设置mCurrentPhotoPath到"file:" + image.getAbsolutePath()，并且该值既不是文件系统路径，也不是一个Uri。

• 如果您没有拍照（如果photoFile为null），则您正在致电setPic()。

• 您在用户拍照之前拨打setPic()，因为startActivityForResult()是异步的。将您的setPic()电话拨入onActivityResult()，然后只有当您获得RESULT_OK（表示希望用户拍摄照片时）。

Answer 2

我没有看到您检查相机是否存在。同上Commonsware，你的日志不是崩溃。继你似乎在跟随官方文档。确保你的代码完全一样，加上下面的检查。

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; 
} 

，在部分装置说你仍然会崩溃（看你的了华硕的Nexus），如果你尝试显式访问后置摄像头，但超出了这个答案的范围。

我提到所有这一切，因为我看到你在模拟器上，这对于访问sudo硬件是非常有问题的。