android闪关灯的开启和关闭方法代码实例

1、activity_main.xml 两个按钮，一个open一个close
复制代码 代码如下:
    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"
    tools:context=".MainActivity" >

            android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

            android:id="@+id/button_open"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="38dp"
        android:text="open" />

            android:id="@+id/button_close"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button_open"
        android:layout_below="@+id/button_open"
        android:layout_marginTop="50dp"
        android:text="close" />

2、MainActivity 核心代码

复制代码 代码如下:
package com.qiantu.flashlight;

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

public class MainActivity extends Activity {
 private Camera camera;
 private Button openBtn;
 private Button closeBtn;

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

  openBtn = (Button) findViewById(R.id.button_open);
  openBtn.setonClickListener(new onClickListener() {
   @Override
   public void onClick(View v) {
    if (null != camera) {
     Parameters parameters = camera.getParameters();
     parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
     camera.setParameters(parameters);
    }
   }
  });

  closeBtn = (Button) findViewById(R.id.button_close);
  closeBtn.setonClickListener(new onClickListener() {
   @Override
   public void onClick(View v) {
    if (null != camera) {
     Parameters parameters = camera.getParameters();
     parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
     camera.setParameters(parameters);
    }
   }
  });
 }

 @Override
 protected void onStart() {
  super.onStart();
  camera = Camera.open();
 }

 @Override
 protected void onDestroy() {
  super.onDestroy();
  if (null != camera) {
   camera.release();
  }
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

3、AndroidManifest.xml 加入摄像头和闪关灯的权限
复制代码 代码如下:

    package="com.qiantu.flashlight"
    android:versionCode="1"
    android:versionName="1.0" >

            android:minSdkVersion="8"
        android:targetSdkVersion="18" />
   
   
   
 
   
 
 
 

            android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
                    android:name="com.qiantu.flashlight.MainActivity"
            android:label="@string/app_name" >