參考自:http://blog.csdn.net/junjieking/article/details/7732884與http://blog.csdn.net/lincyang/article/details/7366188
Camera自帶豐富的接口與Parameters,我們只管拿來使用就好了。
- <span style="font-size:18px;"> private Camera camera = null;
- private Parameters parameters = null;
- //直接開啓
- camera = Camera.open();
- parameters = camera.getParameters();
- parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);//開啓
- camera.setParameters(parameters);
- //直接關閉
- parameters.setFlashMode(Parameters.FLASH_MODE_OFF);//關閉
- camera.setParameters(parameters);
- camera.release();</span>
- private void OpenLightOn() {
- if ( null == m_Camera )
- {
- m_Camera = Camera.open();
- }
- Camera.Parameters parameters = m_Camera.getParameters();
- parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
- m_Camera.setParameters( parameters );
- m_Camera.autoFocus( new Camera.AutoFocusCallback (){
- public void onAutoFocus(boolean success, Camera camera) {
- }
- });
- m_Camera.startPreview();
- }
- private void CloseLightOff() {
- if ( m_Camera != null )
- {
- m_Camera.stopPreview();
- m_Camera.release();
- m_Camera = null;
- }
- }
完整代碼:
public class HandLightActivity extends Activity implements OnClickListener{
private ToggleButton toggleButton;
private Camera m_Camera;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.handlight);
toggleButton = (ToggleButton)this.findViewById(R.id.toggleButton1);
toggleButton.setOnClickListener(this);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
@Override
public void onClick(View v) {
ToggleButton tb = (ToggleButton)v;
if(!tb.isChecked()){
PackageManager pm= this.getPackageManager();
FeatureInfo[] features=pm.getSystemAvailableFeatures();
for(FeatureInfo f : features)
{
if(PackageManager.FEATURE_CAMERA_FLASH.equals(f.name)) //判斷設備是否支持閃光燈
{
if ( null == m_Camera )
{
m_Camera = Camera.open();
}
Camera.Parameters parameters = m_Camera.getParameters();
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
m_Camera.setParameters( parameters );
m_Camera.startPreview();
toggleButton.setBackgroundColor(0x30ffffff);
}
}
}else{
if ( m_Camera != null )
{
m_Camera.stopPreview();
m_Camera.release();
m_Camera = null;
}
toggleButton.setBackgroundColor(0xffffffff);
}
}
}
handlight.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ToggleButton android:id="@+id/toggleButton1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:checked="true"
android:text="ToggleButton"/>
</LinearLayout>
需要加上權限
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.hardware.camera"/>
注意:並不是所有的設備都支持
還有一種方式:
用IHardwareService直接控制
Android1.5以前是直接提供這個接口的,之後呢,需要我們自己來做一下。
在你的項目中新建一個包android.os,新建一個IHardwareService.aidl文件,內容如下:
- <span style="font-size:18px;">package android.os;
- /** {@hide} */
- interface IHardwareService
- {
- // obsolete flashlight support
- boolean getFlashlightEnabled();
- void setFlashlightEnabled(boolean on);
- }</span>
- import android.os.IHardwareService;
- /**
- * 設置閃光燈的開啓和關閉
- * @param isEnable
- * @author linc
- * @date 2012-3-18
- */
- private void setFlashlightEnabled(boolean isEnable)
- {
- try
- {
- Method method = Class.forName("android.os.ServiceManager").getMethod("getService", String.class);
- IBinder binder = (IBinder) method.invoke(null, new Object[] { "hardware" });
- IHardwareService localhardwareservice = IHardwareService.Stub.asInterface(binder);
- localhardwareservice.setFlashlightEnabled(isEnable);
- }
- catch (Exception e)
- {
- e.printStackTrace();
- }
- }
- <span style="font-size:18px;"> <uses-permission android:name="android.permission.FLASHLIGHT" />
- <uses-permission android:name="android.permission.HARDWARE_TEST" /> </span>