Question

 int[] imgid = {R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call};

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

    for (int i = 0; i < imgid.length; i++) {

        ImageView phnImg = (ImageView) findViewById(imgid[i]);

拨打电话

        phnImg.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                final int REQUEST_PHONE_CALL = 1;
                Intent callIntent = new Intent(Intent.ACTION_CALL);
                callIntent.setData(Uri.parse("tel:123456789"));

                //checks for permission before placong the call
                if (ActivityCompat.checkSelfPermission(PickUpActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling

                    ActivityCompat.requestPermissions(PickUpActivity.this, new String[]{Manifest.permission.CALL_PHONE}, REQUEST_PHONE_CALL);
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.

                } else {

                    startActivity(callIntent);

                }
            }
        });
    }

错误

尝试调用虚拟方法'void android.widget.ImageView.setOnClickListener（android.view.View $ OnClickListener）' 在空对象引用上

Answer 1

您想要一个id列表，但是您的代码获得了一个drawable列表，这就是您收到此错误的原因。

int[] imgid = {R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call, R.drawable.call};

所以请按以下说明进行纠正

int[] imgid = {R.id.image_id, R.id.image_id, R.id.image_id, R.id.image_id, R.id.image_id, R.id.image_id, R.id.image_id, R.id.image_id};

image_id是您的ID，它位于您的布局xml文件中。

我有一张图片清单。在单击每个imageView时，我想从应用程序拨打电话。但是我收到错误

1 个答案: