由网友(如癡如狂)分享简介：我面临与三星Galaxy Tab的一个问题。我想用相机的闪光灯作为火炬。I'm facing to a problem with a Samsung Galaxy Tab. I want to use the camera flash as torch.没有人知道如何启用它？Does anyone know ho...

我面临与三星Galaxy Tab的一个问题。我想用相机的闪光灯作为火炬。

I'm facing to a problem with a Samsung Galaxy Tab. I want to use the camera flash as torch.

没有人知道如何启用它？

Does anyone know how to enable it ?

在此一code，工程启用/禁用对HTC Desire的相机闪光灯，但未能对三星Galaxy Tab。

Hereby a code that works to enable/disable the camera flash on a HTC Desire but fails on Samsung Galaxy Tab.

FlashLight.java：的

FlashLight.java :

package com.example.FlashLight;

import android.app.Activity;
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 FlashLight extends Activity {
    private final static String LOG_TAG = "FlashLight";

    private Button mOnBtn;
    private Button mOffBtn;

    private Camera mCamera;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mOnBtn = (Button) findViewById(R.id.on_btn);
        mOnBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                processOnClick();
            }
        });

        mOffBtn = (Button) findViewById(R.id.off_btn);
        mOffBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                processOffClick();
            }
        });
   }

    @Override
    protected void onResume() {
        super.onResume();
        try{
            mCamera = Camera.open();
        } catch( Exception e ){
            Log.e(LOG_TAG, "Impossible d'ouvrir la camera");
        }
    }

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

    private void processOffClick(){
        if( mCamera != null ){
            Parameters params = mCamera.getParameters();
            params.setFlashMode( Parameters.FLASH_MODE_OFF );
            mCamera.setParameters( params );
        }
    }

    private void processOnClick(){
        if( mCamera != null ){
            Parameters params = mCamera.getParameters();
            params.setFlashMode( Parameters.FLASH_MODE_TORCH );
            mCamera.setParameters( params );
        }
    }
}

的Andr​​oidManifest.xml：的                   

AndroidManifest.xml :

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".FlashLight"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

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

布局/ main.xml中：的

layout/main.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <Button  
        android:id="@+id/on_btn"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="Flash ON" />

    <Button  
        android:id="@+id/off_btn"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="Flash OFF" />
</LinearLayout>

谢谢！

推荐答案

您没有做错什么。事实上，你正在做的一切是正确的。您遇到非常$在Android世界p $ pvalent设备特定问题。我发现以下行为模式的FLASH_MODE_TORCH：

You aren't doing anything wrong. In fact, you are doing everything correct. You are encountering a Device-Specific issue that is very prevalent in the Android world. I have found the following behavioral patterns for FLASH_MODE_TORCH:

在所有情况下工作细 工作正常但不支持自动聚焦于 在根本不工作 Works fine in all cases Works fine, but not with autofocus on Doesn't work at all

无奈的是，getSupportedFlashModes（）将返回FLASH_MODE_TORCH几乎所有的设备上时，只有极少数的真正支持。

Frustratingly, getSupportedFlashModes() will return FLASH_MODE_TORCH on nearly every device when only a handful actually support it.

此外，一些设备实现调酒的支持闪光模式。如果你通过Camera.Parameters你可以尝试设置闪光模式FLASH_MODE_ON，FLASH_MODE_AUTO或FLASH_MODE_RED_EYE，看看是否有任何工作。注 - 这是一个设备专用的劈

Also, some device implementations swizzle the supported flash modes. If you go through Camera.Parameters you can try setting the flash mode to FLASH_MODE_ON, FLASH_MODE_AUTO or FLASH_MODE_RED_EYE and see whether any of them work. Note - this is a device-specific hack.

我已经申请这些类型的错误的与谷歌有关的DroidX和Nexus S.他们关闭它作为一个设备特定问题。我要说的，希望有一个驱​​动程序或固件修复这种情况报告给三星，但他们的支持Android渠道的不存在。

I have filed these types of bugs with Google regarding the DroidX and Nexus S. They closed it as a device-specific issue. I would say to report this to Samsung in hopes for a driver or firmware fix, but their Android support channels do not exist.