Question

此代码无法在所有Android版本上正常运行

在Android 4.x上工作正常，但在7.0上这段代码不起作用。代码可以捕获并保存图像，但关于裁剪图像的最后一步：我得到黑屏，意味着uri丢失了。请在下面的代码后检查屏幕截图。

这是我的演示：

import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.IOException;

public class CameraCrop1 extends AppCompatActivity {
    Uri picUri;
    Bitmap bitmap, bitmap2;
    ImageView img, img_original;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_camera_crop1);

        img=(ImageView)findViewById(R.id.imageView);
        img_original=(ImageView)findViewById(R.id.imageView_original);
    }

    public void Capture(View view) {
        Capture_Cam();
    }

    private void Capture_Cam() {
        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(cameraIntent, 1);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {


        if (requestCode == 1 && resultCode == RESULT_OK && data != null) {

            picUri = data.getData();
            try {
                // bitmap2 = MediaStore.Images.Media.getBitmap(this.getContentResolver(), picUri); // bitmap2 = original before cur
                bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse("file://"+picUri));
                img_original.setImageBitmap(bitmap);

            } catch (IOException e) {
                e.printStackTrace();
            }
            performCrop();

        } else if (requestCode == 2) {

            bitmap2=(Bitmap) data.getExtras().get("data");
            img.setImageBitmap(bitmap2);

        }else{
            super.onActivityResult(requestCode, resultCode, data);
        }

    }

    private void performCrop(){
        try {

            Intent cropIntent = new Intent("com.android.camera.action.CROP");
            //indicate image type and Uri
            cropIntent.setDataAndType(picUri, "image/*");
            cropIntent.putExtra("crop", "true");
            cropIntent.putExtra("aspectX", 1);
            cropIntent.putExtra("aspectY", 1);
            cropIntent.putExtra("outputX", 100);
            cropIntent.putExtra("outputY", 100);
            cropIntent.putExtra("scale", true);
            cropIntent.putExtra("return-data", true);
            startActivityForResult(cropIntent, 2);
            Toast toast = Toast.makeText(this, "Done", Toast.LENGTH_SHORT);
        }
        catch(ActivityNotFoundException anfe){
            //display an error message
            String errorMessage = "Whoops - your device doesn't support the crop action!";
            Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
            toast.show();
        }

    }

}

这是xml：

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_camera_crop1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="Test.testing.CameraCrop1">

    <ImageView
        android:layout_width="400px"
        android:layout_height="400px"
        app:srcCompat="@color/colorAccent"
        android:id="@+id/imageView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:text="Capture Camera"
        android:onClick="Capture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button4"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:layout_width="400px"
        android:layout_height="400px"
        app:srcCompat="@color/wallet_highlighted_text_holo_dark"
        android:id="@+id/imageView_original"
        android:layout_below="@+id/imageView"
        android:layout_alignLeft="@+id/imageView"
        android:layout_alignStart="@+id/imageView" />
</RelativeLayout>

Screenshot

Answer 1

您必须使用FileProvider.getUriForFile(Context, String, File)获取图片的URI才能获得类似content://

的URI

针对针对Android 7.0（API级别24）及更高版本的更新应用，在包边界上传递file：// URI会导致a FileUriExposedException。

看一下here，了解如何实现这一目标。

Answer 2

@pablobu，如果我使用那里的方法我得到这个错误：

java.lang.NullPointerException：尝试调用虚方法＆＃39; android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData（android.content.pm.PackageManager，java.lang。字符串）＆＃39;在空对象引用上

此行错误：

Uri photoURI = FileProvider.getUriForFile(this, // error is here

private void Capture_Cam() {
    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(this, // error is here
                    "com.example.android.fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, 1000);
        }
    }
}


private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
        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 */
    );

我修复了错误。新SDK版本不支持以下格式：＆＃34; file：//＆＃34; 我的意思是 TargetVersion 。 Til版本23支持＆＃34; file：//＆＃34; 源：Found here

如何正确获取捕获的Bitmap的uri？

2 个答案: