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This article is about how to use Android to implement a simple flashlight. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The details are as follows

XML:

Java:

Package com.example.flashlightactivite;import android.Manifest;import android.content.pm.PackageManager;import android.hardware.Camera;import android.os.Build;import android.support.v4.app.ActivityCompat;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.ImageButton;public class Switch_Activity extends AppCompatActivity {ImageButton flashLightSwitch; boolean flag = false; SurfaceView surfaceView; Camera camera; Camera.Parameters camera_parameters / / camera parameters / / set the resolution of the camera and the resolution supported by the device / / Camera.Size camera_size; SurfaceHolder surfaceHolder;// SurfaceHolder is an interface that acts like a listener for Surface. Provide methods related to accessing and controlling the Surface behind the SurfaceView / / * be sure to add permissions to the AndroidManifest.xml: / permission PERMISSION_STORAGE: allow storage private static String [] PERMISSION_STORAGE = {Manifest.permission.CAMERA}; / / request dynamic code REQUEST_PERMISSION_CODE: request permission code private static int REQUEST_PERMISSION_CODE = 1; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState) SetContentView (R.layout.activitylicense switch _); / / determine the level of version number and lollipop version number if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {/ / checkSelfPermission: self-inspection permission if (ActivityCompat.checkSelfPermission (this,Manifest.permission.CAMERA)! = PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions (this,PERMISSION_STORAGE,REQUEST_PERMISSION_CODE);}} flashLightSwitch = findViewById (R.id.imageButton) SurfaceView = findViewById (R.id.surfaceView); camera = Camera.open (); camera_parameters = camera.getParameters (); surfaceHolder = surfaceView.getHolder (); surfaceHolder.addCallback (new SurfaceHolder.Callback () {@ Override public void surfaceCreated (SurfaceHolder holder) {try {camera.setPreviewDisplay (surfaceHolder);} catch (Exception e) {/ / release camera object camera.release ();} camera.startPreview () } @ Override public void surfaceChanged (SurfaceHolder holder, int format, int width, int height) {} @ Override public void surfaceDestroyed (SurfaceHolder holder) {}}); / ImageButton add click event flashLightSwitch.setOnClickListener (new View.OnClickListener () {@ Override public void onClick (View v) {if (! flag) {/ / change the value of flag flag = true;// change picture R. Bag. Figure flashLightSwitch.setImageResource (R.drawable.on); / / sets the type flash mode of flash: torch camera_parameters.setFlashMode (Camera.Parameters.FLASH_MODE_TORCH); camera.setParameters (camera_parameters);} else {flashLightSwitch.setImageResource (R.drawable.off); flag = false;// off flash camera_parameters.setFlashMode (Camera.Parameters.FLASH_MODE_OFF); camera.setParameters (camera_parameters) });}} / * * FLASH_MODE_RED_EYE red-eye prevention mode to reduce or prevent the red-eye appearance of portraits in the picture. FLASH_MODE_TORCH filling mode, which weakens the flash intensity in normal light. FLASH_MODE_AUTO automatic mode, which will flash automatically when necessary. FLASH_MODE_OFF flash mode will not be turned off when FLASH_MODE_ON snapshots will be turned off forever * * /

AndroidManifest.xml:

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