Android 如何在ImageView中显示图像

所以我试图在ImageView中显示捕获的图像，但由于某些原因，我的ImageView保持黑色。如果我从drawable文件夹中选择一个图像，它会工作。捕获的图像也存在于正确的文件夹中

摄像机的目的是：

Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());
    startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);

与

以下是我尝试过的事情：

一,

与

我修改了上面的方法调用，因此它为上面的方法提供了一个文件而不是Uri

二,

三,

我试图使用

Bitmap photo=（Bitmap）data.getExtras（）.get（“data”）也是，但我的应用程序在相机应用程序关闭后立即崩溃。由于某种原因，数据返回null。这是崩溃日志：

10-14 10:38:10.728  32275-32275/com.example.debt E/AndroidRuntime? FATAL EXCEPTION: main
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.debt/com.example.debt.ScanReceiptActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.deliverResults(ActivityThread.java:3184)
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3227)
            at android.app.ActivityThread.access$1100(ActivityThread.java:138)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1252)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4872)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.example.debt.ScanReceiptActivity.onActivityResult(ScanReceiptActivity.java:78)
            at android.app.Activity.dispatchActivityResult(Activity.java:5375)
            at android.app.ActivityThread.deliverResults(ActivityThread.java:3180)
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3227)
            at android.app.ActivityThread.access$1100(ActivityThread.java:138)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1252)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4872)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
            at dalvik.system.NativeStart.main(Native Method)

我在LG P880上运行了该应用程序。
您是否尝试过将
CAMERA\u PIC\u REQUEST
更改为
CAMERA\u REQUEST

Intent cameraIntent=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());

startActivityForResult(cameraIntent, CAMERA_REQUEST);

捕获图像后，您将在ActivtyResult中获得结果

if (requestCode == CAMERA_REQUEST) {  
    Bitmap photo = (Bitmap) data.getExtras().get("data"); 
}

我在活动顶部定义了该变量：
private static final int-CAMERA\u PIC\u REQUEST=1。我也喜欢那个if分支。我测试过了。如果我使用
Bitmap photo=（Bitmap）data.getExtras（）.get（“data”）我的应用程序在相机应用程序关闭后立即崩溃。@Timbotbo发布你的日志，不要使用你定义的
相机图片请求
，用
相机图片请求
试试看它是否有问题difference@timbotombo还可以尝试
startActivtyForResult（cameraIntent，1337）
当我没有定义
CAMERA\u PIC\u REQUEST
或
CAMERA\u REQUEST
时，无法解析该变量。我在上面的帖子中添加了坠机报告。我试着用手机上的图像设置ImageView，它不仅被捕获，而且意识到它也不起作用——黑色的ImageView。所以我假设这个问题与摄像机无关。
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAMERA_PIC_REQUEST) {
        ImageView receiptImage = (ImageView) findViewById(R.id.result_image);

        Uri receiptUri = Uri.parse("/receipts/3.png");

        try {
            InputStream inputStream = getContentResolver().openInputStream(receiptUri);
            Drawable drawable = Drawable.createFromStream(inputStream, null);
            receiptImage .setImageDrawable(drawable);
        } catch (FileNotFoundException e) {}
    }
}

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAMERA_PIC_REQUEST) {
        ImageView receiptImage = (ImageView) findViewById(R.id.result_image);
        receiptImage.setImageBitmap(BitmapFactory.decodeFile("/receipts/3.png"));  
    }
}

10-14 10:38:10.728  32275-32275/com.example.debt E/AndroidRuntime? FATAL EXCEPTION: main
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.debt/com.example.debt.ScanReceiptActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.deliverResults(ActivityThread.java:3184)
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3227)
            at android.app.ActivityThread.access$1100(ActivityThread.java:138)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1252)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4872)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.example.debt.ScanReceiptActivity.onActivityResult(ScanReceiptActivity.java:78)
            at android.app.Activity.dispatchActivityResult(Activity.java:5375)
            at android.app.ActivityThread.deliverResults(ActivityThread.java:3180)
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3227)
            at android.app.ActivityThread.access$1100(ActivityThread.java:138)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1252)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4872)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
            at dalvik.system.NativeStart.main(Native Method)

Intent cameraIntent=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());

startActivityForResult(cameraIntent, CAMERA_REQUEST);

if (requestCode == CAMERA_REQUEST) {  
    Bitmap photo = (Bitmap) data.getExtras().get("data"); 
}