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package me.parzibyte.leercodigosdebarras; | |
import android.Manifest; | |
import android.app.Activity; | |
import android.content.Intent; | |
import android.content.pm.PackageManager; | |
import android.os.Bundle; | |
import android.support.annotation.NonNull; | |
import android.support.annotation.Nullable; | |
import android.support.v4.app.ActivityCompat; | |
import android.support.v4.content.ContextCompat; | |
import android.support.v7.app.AppCompatActivity; | |
import android.view.View; | |
import android.widget.Button; | |
import android.widget.TextView; | |
import android.widget.Toast; | |
public class MainActivity extends AppCompatActivity { | |
private static final int CODIGO_PERMISOS_CAMARA = 1, CODIGO_INTENT = 2; | |
private boolean permisoCamaraConcedido = false, permisoSolicitadoDesdeBoton = false; | |
private TextView tvCodigoLeido; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_main); | |
verificarYPedirPermisosDeCamara(); | |
Button btnEscanear = findViewById(R.id.btnEscanear); | |
tvCodigoLeido = findViewById(R.id.tvCodigoLeido); | |
btnEscanear.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View v) { | |
if (!permisoCamaraConcedido) { | |
Toast.makeText(MainActivity.this, "Por favor permite que la app acceda a la cámara", Toast.LENGTH_SHORT).show(); | |
permisoSolicitadoDesdeBoton = true; | |
verificarYPedirPermisosDeCamara(); | |
return; | |
} | |
escanear(); | |
} | |
}); | |
} | |
private void escanear() { | |
Intent i = new Intent(MainActivity.this, ActivityEscanear.class); | |
startActivityForResult(i, CODIGO_INTENT); | |
} | |
@Override | |
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { | |
if (requestCode == CODIGO_INTENT) { | |
if (resultCode == Activity.RESULT_OK) { | |
if (data != null) { | |
String codigo = data.getStringExtra("codigo"); | |
tvCodigoLeido.setText(codigo); | |
} | |
} | |
} | |
} | |
@Override | |
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { | |
switch (requestCode) { | |
case CODIGO_PERMISOS_CAMARA: | |
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { | |
// Escanear directamten solo si fue pedido desde el botón | |
if (permisoSolicitadoDesdeBoton) { | |
escanear(); | |
} | |
permisoCamaraConcedido = true; | |
} else { | |
permisoDeCamaraDenegado(); | |
} | |
break; | |
} | |
} | |
private void verificarYPedirPermisosDeCamara() { | |
int estadoDePermiso = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA); | |
if (estadoDePermiso == PackageManager.PERMISSION_GRANTED) { | |
// En caso de que haya dado permisos ponemos la bandera en true | |
// y llamar al método | |
permisoCamaraConcedido = true; | |
} else { | |
// Si no, pedimos permisos. Ahora mira onRequestPermissionsResult | |
ActivityCompat.requestPermissions(MainActivity.this, | |
new String[]{Manifest.permission.CAMERA}, | |
CODIGO_PERMISOS_CAMARA); | |
} | |
} | |
private void permisoDeCamaraDenegado() { | |
// Esto se llama cuando el usuario hace click en "Denegar" o | |
// cuando lo denegó anteriormente | |
Toast.makeText(MainActivity.this, "No puedes escanear si no das permiso", Toast.LENGTH_SHORT).show(); | |
} | |
} |
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