Android Camera怎样打开关闭闪光灯

打开
camera = Camera.open();
Parameters p = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
camera.startPreview();


关闭
camera = Camera.open();
Parameters p = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);

camera.stopPreview();


AndroidManifest.xml
 <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />


测试代码
main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativeLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
    <Button
        android:id="@+id/buttonFlashlight"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:text="Torch" />
 

</RelativeLayout>


AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cjp.android"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk android:minSdkVersion="10" />
 
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
 
    <application
        android:debuggable="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".FlashLightActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 

</manifest>


FlashLightActivity.java


package com.cjp.android;
 
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
 
public class FlashLightActivity extends Activity {
 
//flag to detect flash is on or off
private boolean isLighOn = false;
 
private Camera camera;
 
private Button button;
 
@Override
protected void onStop() {
super.onStop();
 
if (camera != null) {
camera.release();
}
}
 
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
 
button = (Button) findViewById(R.id.buttonFlashlight);
 
Context context = this;
PackageManager pm = context.getPackageManager();
 
// if device support camera?
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Log.e("err", "Device has no camera!");
return;
}
 
camera = Camera.open();
final Parameters p = camera.getParameters();
 
button.setOnClickListener(new OnClickListener() {
 
@Override
public void onClick(View arg0) {
 
if (isLighOn) {
 
Log.i("info", "torch is turn off!");
 
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.stopPreview();
isLighOn = false;
 
} else {
 
Log.i("info", "torch is turn on!");
 
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
 
camera.setParameters(p);
camera.startPreview();
isLighOn = true;
 
}
 
}
});
 
}
}

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