Android Realizes Simple Flashlight Function
- 2021-11-13 02:45:09
- OfStack
In this paper, we share the specific code of Android to realize simple flashlight function for your reference. The specific contents are as follows
XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Switch_Activity">
<ImageButton
android:id="@+id/imageButton"
android:layout_width="225dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="267dp"
app:srcCompat="@drawable/off" />
<!-- android:layout_centerHorizontal="true" Horizontal center -->
<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="378dp"
android:layout_height="221dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginStart="23dp"
android:layout_marginLeft="23dp"
android:layout_marginTop="29dp" />
</RelativeLayout>
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 camera resolution and the resolution supported by the device
// Camera.Size camera_size;
SurfaceHolder surfaceHolder;
// SurfaceHolder Yes 1 Interface, which acts like 1 About Surface The listener. Provide access and control SurfaceView Behind Surface Related methods
// ***** 1 It must be in AndroidManifest.xml Add permissions to: <uses-permission android:name="android.permission.CAMERA"></uses-permission>
// <uses-permission android:name="android.permission.FLASHLIGHT"/>
// Authority 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.activity_switch_ );
// Determine version number and Lollipop version number The rank of
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
// checkSelfPermission: Self-check authority
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 a click event
flashLightSwitch.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
if ( !flag ) {
// Change flag Value of
flag = true;
// Change Picture R. Bag . Figure
flashLightSwitch.setImageResource( R.drawable.on );
// Settings flash Type of Flash mode: torch
camera_parameters.setFlashMode( Camera.Parameters.FLASH_MODE_TORCH );
camera.setParameters( camera_parameters );
}else {
flashLightSwitch.setImageResource( R.drawable.off );
flag = false;
// Shut down flash
camera_parameters.setFlashMode( Camera.Parameters.FLASH_MODE_OFF );
camera.setParameters( camera_parameters );
}
}
} );
}
}
/*
* FLASH_MODE_RED_EYE Anti-red eye mode, which reduces or prevents the red eye of people on pictures.
FLASH_MODE_TORCH Fill mode will reduce the flash intensity under normal illumination.
FLASH_MODE_AUTO Automatic mode, it will flash automatically when necessary.
FLASH_MODE_OFF Flash mode will not be turned off
FLASH_MODE_ON Flash mode will always be turned off during snapshot
* */
AndroidManifest. xml:
<!-- Add Permissions -->
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-feature android:name="android.hardware.Camera"/>