Question

我正在使用Android Studio创建应用程序。我希望系统能够访问手机的摄像头。它在模拟器上工作，我能够拍摄照片并将图片设置为ImageView中的图像。

但是，我开始使用手机运行，但相机无法正常工作。通常当我点击ImageButton时，相机会打开，但现在，它会将我重定向回我之前打开的页面。

这是我的代码：

public class DriverActivity extends AppCompatActivity {

Button btnDriverBack, btnDriverSubmit;
ImageButton ibtnDriverPhoto;
ImageView imageDriver;
EditText etDriverFirstName, etDriverLastName, etDriverMiddleName, etDriverBDay;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_driver);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    ibtnDriverPhoto = (ImageButton) findViewById(R.id.ibtnDriverPhoto);
    imageDriver = (ImageView) findViewById(R.id.imageDriver);

    etDriverFirstName = (EditText) findViewById(R.id.etDriverFirstName);
    etDriverMiddleName = (EditText) findViewById(R.id.etDriverMiddleName);
    etDriverLastName = (EditText) findViewById(R.id.etDriverLastName);
    etDriverBDay = (EditText) findViewById(R.id.etDriverBDay);

    ibtnDriverPhoto.setOnClickListener(new OnClickListener(){
        public void onClick(View v){
            Intent camera = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(camera, 1);
        }
    });

    btnDriverBack = (Button) findViewById(R.id.btnDriverBack);
    btnDriverBack.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v){
            Intent driveBack = new Intent(DriverActivity.this, SummaryActivity.class);
            startActivity(driveBack);
        }
    });

    btnDriverSubmit = (Button) findViewById(R.id.btnDriverSubmit);
    btnDriverSubmit.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v){
            Intent driverSubmit = new Intent(DriverActivity.this, CreditCardActivity.class);
            startActivity(driverSubmit);
        }
    });

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 1)
    {
        Bitmap license = (Bitmap) data.getExtras().get("data");
        imageDriver.setImageBitmap(license);
    }
}

我已设置正确的使用权限。任何帮助将不胜感激，谢谢！：）

Answer 1

首先尝试这个

private final int REQUEST_CAMERA_USAGE = 200;

if (Build.VERSION.SDK_INT >= 21) {
            int permissionCheck = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA);
            if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_USAGE);
            } else {

            }
        }



 @Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
            case REQUEST_CAMERA_USAGE:
            if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) {

            } else {
                Toast.makeText(getApplicationContext(), "This Permission is needed for the app to work perfectly!", Toast.LENGTH_SHORT).show();
            }
        default:
            Toast.makeText(getApplicationContext(), "Something went wrong", Toast.LENGTH_SHORT).show();
            break;
    }
}

Answer 2

如果你有上面的Lollipop版本，那么添加运行时权限

Answer 3

要检查是否是权限问题，请转到settings-＆gt; your_app-＆gt;权限并手动将其设置为true，如果问题解决，则在打开相机之前在代码中添加运行时权限。

Android相机适用于模拟器但不适用于手机？

3 个答案: