android开启闪光灯

public class MainActivity extends AppCompatActivity {
Camera camera=null;
Camera.Parameters parameters;

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

//直接开启
camera = Camera.open();
parameters = camera.getParameters();
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//开启
camera.setParameters(parameters);
}

}