java - android studio 无法在 ImageView 中显示图像

Question

//全局变量

static final int CAMERA_REQUEST = 1;
ImageView imageview;
Bitmap bitmap;

//创建时:

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

//引用

imageview = findViewById(R.id.image_view);

//onclick 监听器和 Intent :

Button take_photo_btn = findViewById(R.id.photo_btn);
take_photo_btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, CAMERA_REQUEST);
    }
});

//这是结果的 Activity :

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CAMERA_REQUEST && requestCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        bitmap = (Bitmap) extras.get("image");
        imageview.setImageBitmap(bitmap);
    }
}

拍完照片后，我没有在 ImageView 中看到它，这是什么问题？

Answer 1

如果您正在使用 Marshmallow，那么您必须为在 Android 中使用的相机实现运行时权限。

更多详情请访问此链接 https://developer.android.com/training/permissions/requesting