Android 小应用之一个activity实现简易手电筒(内附免费源码)

Android小应用之一个activity实现简易手电筒(内附免费源码)

    • 1.activity代码
    • 2.xml代码
    • 3.资源文件代码
    • 4.源码压缩包(免费)

今天爷爷说他手机更新之后找不到手电筒了,我心想是不是爷爷年纪大了的原因,然后拿过手机一看,竟然还真找不到,好吧,给爷爷到应用市场下载了一个手电筒,但是一个2.多mb的手电筒竟然还有广告,我想着还不如我自己写一个,虽然我是小小白,但好歹我也学了安卓,然后就搜博客找到一篇十分适合我的博客,最后成功制作出我的“玫瑰手电筒”(当然给我爷爷的会更加特别哈哈哈,在这里是面向广大用户,所以在有些地方做了一些修改)
参考博客

真机运行演示(模拟器没闪光灯的,点亮手电筒会报错)
Android 小应用之一个activity实现简易手电筒(内附免费源码)_第1张图片

手电图案灰色为关闭闪光灯,手电图案彩色为打开了闪光灯,然后下面的字也会切换

1.activity代码


public class MainActivity extends AppCompatActivity {


    ConstraintLayout mConstraintLayout;
    Button mButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButton=findViewById(R.id.button);
        mConstraintLayout=findViewById(R.id.constraintLayout);
        final FlashUtils utils = new FlashUtils(this);
        mConstraintLayout.setSelected(false);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

               utils.converse();



            }
        });
    }

    public class FlashUtils {
        private CameraManager manager;
        private Camera mCamera = null;
        private Context context;
        private boolean status = false;//记录手电筒状态

        FlashUtils(Context context){
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
            }
            this.context = context;
        }

        //打开手电筒
        public void open() {
            if(status){//如果已经是打开状态,不需要打开
                return;
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                try {
                    manager.setTorchMode("0", true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                PackageManager packageManager = context.getPackageManager();
                FeatureInfo[] features = packageManager.getSystemAvailableFeatures();
                for (FeatureInfo featureInfo : features) {
                    if (PackageManager.FEATURE_CAMERA_FLASH.equals(featureInfo.name)) { // 判断设备是否支持闪光灯
                        if (null == mCamera) {
                            mCamera = Camera.open();
                        }
                        Camera.Parameters parameters = mCamera.getParameters();
                        parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                        mCamera.setParameters(parameters);
                        mCamera.startPreview();
                    }
                }
            }
            status = true;//记录手电筒状态为打开
        }

        //关闭手电筒
        public void close() {
            if(!status){//如果已经是关闭状态,不需要打开
                return;
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                try {
                    manager.setTorchMode("0", false);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                if (mCamera != null) {

                    mCamera.stopPreview();
                    mCamera.release();
                    mCamera = null;
                }
            }
            status = false;//记录手电筒状态为关闭
        }

        //改变手电筒状态
        public void converse(){
            if(status){
                close();
                mConstraintLayout.setSelected(false);
            }else{
                open();
                mConstraintLayout.setSelected(true);
            }
        }
    }

}

2.xml代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/constraintLayout"
    android:layout_height="match_parent"
    android:background="#000000"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginStart="20dp"
        android:layout_marginLeft="20dp"
        android:background="@drawable/love"
        app:layout_constraintBottom_toBottomOf="@+id/textView2"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="@+id/textView2" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"
        android:text="为你定制"
        android:textColor="#03A9F4"
        android:textSize="24sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginEnd="20dp"
        android:layout_marginRight="20dp"
        android:background="@drawable/love"
        app:layout_constraintBottom_toBottomOf="@+id/textView2"
        app:layout_constraintEnd_toStartOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="@+id/textView2" />


    <Button
        android:id="@+id/button"
        android:layout_width="300dp"
        android:layout_height="300dp"

        android:background="@drawable/flash_icon"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="'走路小心,注意安全'"
        android:textColor="@color/textcolor"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="100dp"
        android:textSize="24sp"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="'天天开心'"
        android:textColor="@color/text2color"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="100dp"
        android:textSize="24sp"/>
</androidx.constraintlayout.widget.ConstraintLayout>

3.资源文件代码

text2color

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="#03A9F4" android:state_selected="false"/>
    <item android:color="#00000000" android:state_selected="true"/>
</selector>

textcolor

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="#000000" android:state_selected="false"/>
    <item android:color="#F44336" android:state_selected="true"/>

</selector>

flash_icon

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:drawable="@drawable/flash"/>
    <item android:state_selected="false" android:drawable="@drawable/unflash"/>

</selector>

4.源码压缩包(免费)

https://download.csdn.net/download/qq_46526828/12626160

突然觉得有时候想做一件事虽然是心血来潮,但是完成的感觉却是无与伦比的开心。

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