如何在三星 Galaxy Tab 上使用相机闪光灯/led 作为手电筒? [英] How to use camera flash/led as torch on a Samsung Galaxy Tab?

问题描述

我遇到了三星 Galaxy Tab 的问题.我想将相机闪光灯用作手电筒.

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

有谁知道如何启用它?

在此提供的代码可用于在 HTC Desire 上启用/禁用相机闪光灯，但在三星 Galaxy Tab 上失败.

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

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 );
        }
    }
}

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>

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

你没有做错任何事.事实上，你所做的一切都是正确的.您遇到了一个在 Android 世界中非常普遍的特定于设备的问题.我发现了 FLASH_MODE_TORCH 的以下行为模式:

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:

• 在所有情况下都能正常工作
• 工作正常，但不能自动对焦
• 根本不起作用

令人沮丧的是，getSupportedFlashModes() 将在几乎所有设备上返回 FLASH_MODE_TORCH，而实际上只有少数设备支持它.

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

此外，某些设备实现会调整支持的闪存模式.如果您通过 Camera.Parameters 您可以尝试设置将闪存模式设置为 FLASH_MODE_ON、FLASH_MODE_AUTO 或 FLASH_MODE_RED_EYE 并查看它们中的任何一个是否有效.注意 - 这是一个特定于设备的 hack.

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.

我已向 Google 提交了这些类型的错误关于 DroidX 和 Nexus S.他们将其作为特定于设备的问题关闭.我想说向三星报告此问题，希望得到驱动程序或固件修复，但他们的 Android 支持渠道 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.

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