Android studio编写简单的手电筒APP

很不错的手电筒APP，分享给大家，希望大家喜欢。

1. Java代码    

package com.example.goo.gfire;

import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class FireActivity extends Activity {
 private Button button;
 private Camera camera = Camera.open();
 private Parameters parameters;
 private boolean islight=true;

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_fire);
  button = (Button) this.findViewById(R.id.bn);
  button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     if (islight) {
       camera.startPreview();
       parameters = camera.getParameters();
       parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
       camera.setParameters(parameters);
       islight = false
       ;
       button.setText("关");
     } else {
       parameters = camera.getParameters();
       parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
       camera.setParameters(parameters);
       islight = true;
       button.setText("开");
     }
    }

});
 }
}

2. FireActivity.java

package com.example.goo.gfire;

import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class FireActivity extends Activity {
 private Button button;
 private Camera camera = Camera.open();
 private Parameters parameters;
 private boolean islight=true;

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_fire);
  button = (Button) this.findViewById(R.id.bn);
  button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     if (islight) {
       camera.startPreview();
       parameters = camera.getParameters();
       parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
       camera.setParameters(parameters);
       islight = false
       ;
       button.setText("关");
     } else {
       parameters = camera.getParameters();
       parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
       camera.setParameters(parameters);
       islight = true;
       button.setText("开");
     }
    }

});
 }
}

3. content_fire.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"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 app:layout_behavior="@string/appbar_scrolling_view_behavior"
 tools:context="com.example.goo.gfire.FireActivity"
 tools:showIn="@layout/activity_fire">

<TextView
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:text="电筒模式"
   android:textSize="34sp"
   android:textStyle="bold"
   android:gravity="center"/>
 <Button
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/bn"
   android:textOff="关"
   android:textOn="开"
   android:height="400dp"
   android:layout_alignParentBottom="true"
   android:layout_centerHorizontal="true"
   android:layout_marginBottom="59dp"
   android:fontFeatureSettings="@string/auth_google_play_services_client_facebook_display_name"
   android:textColor="@color/common_signin_btn_dark_text_focused"
   android:textStyle="bold"
   android:textSize="100sp"
   />

</RelativeLayout>