xml 闪光灯Android应用程序

Posted 2021-05-17

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main_light"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:background="@android:color/black"
    tools:context="com.kavsoftware.kaveer.klight.MainLightActivity"
    android:weightSum="1">

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/flash_light"
        android:src="@drawable/buttonoff"
        android:background="@android:color/transparent"
        android:contentDescription="dede"
        android:layout_marginTop="180dp"
        android:layout_gravity="center" />
</LinearLayout>

package com.kavsoftware.kaveer.klight;

import android.hardware.Camera;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageButton;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.hardware.Camera.Parameters;
import android.view.View;
import android.view.WindowManager;
import android.widget.Toast;

public class MainLightActivity extends AppCompatActivity {

    private ImageButton flashLight;
    private Camera camera;
    private Camera.Parameters parameter;
    private boolean deviceHasFlash;
    private boolean isFlashLightOn = false;

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

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        flashLight = (ImageButton)findViewById(R.id.flash_light);
        deviceHasFlash = getApplication().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
        if(!deviceHasFlash){
            Toast.makeText(MainLightActivity.this, "Sorry, you device does not have any camera", Toast.LENGTH_LONG).show();
            return;
        }
        else{
            this.camera = Camera.open(0);
            parameter = this.camera.getParameters();
        }

        //getCamera();

        flashLight.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!isFlashLightOn){
                    turnOnTheFlash();
                }else{
                    turnOffTheFlash();
                }
            }
        });


    }

    private void turnOffTheFlash() {
        parameter.setFlashMode(Parameters.FLASH_MODE_OFF);
        this.camera.setParameters(parameter);
        this.camera.stopPreview();
        isFlashLightOn = false;
        flashLight.setImageResource(R.drawable.buttonoff);
    }

    private void turnOnTheFlash() {
        if(this.camera != null){
            parameter = this.camera.getParameters();
            parameter.setFlashMode(Parameters.FLASH_MODE_TORCH);
            this.camera.setParameters(parameter);
            this.camera.startPreview();
            isFlashLightOn = true;
            flashLight.setImageResource(R.drawable.buttonon);
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        if(this.camera != null){
            this.camera.release();
            this.camera = null;
        }
    }
    @Override
    protected void onPause() {
        super.onPause();
        turnOffTheFlash();
    }
    @Override
    protected void onResume() {
        super.onResume();
        if(deviceHasFlash){
            turnOffTheFlash();
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        getCamera();
    }


    private void getCamera() {
        if (camera == null) {
            try {
                camera = Camera.open();
                parameter = camera.getParameters();
            } catch (RuntimeException e) {
                System.out.println("Error: Failed to Open: " + e.getMessage());
            }
        }
    }


}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.kavsoftware.kaveer.klight">

    <!--TO ADD PERMISSION-->
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-permission android:name="android.permission.FLASHLIGHT"/>
    <uses-permission android:name="android.permission.WAKE_LOCK"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/klight_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainLightActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>