Hi, i've recently picked up android developing and I know the basics, so I figured I could follow some tutorials and make a simple flashlight app. I tried coding the app in several ways but I could never manage to turn on the LED.
Here is the MainActivity
public class MainActivity extends AppCompatActivity {
ImageButton imageButton;
Camera camera;
Camera.Parameters parameters;
boolean isFlash = false;
boolean isOn = false;
@Override
protected void onStop() {
super.onStop();
if(camera != null){
camera.release();
camera = null;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageButton = (ImageButton)findViewById(R.id.imageButton);
if (getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
camera = Camera.open();
parameters = camera.getParameters();
isFlash = true;
}
imageButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
if (isFlash) {
if (!isOn) {
imageButton.setImageResource(R.drawable.on);
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
camera.setParameters(parameters);
camera.startPreview();
isOn = true;
} else {
imageButton.setImageResource(R.drawable.off);
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
camera.setParameters(parameters);
camera.stopPreview();
isOn = false;
}
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Error");
builder.setMessage("flash not supported");
builder.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
}
});
}
}