更改两个Button成切换按钮 [英] Changing two button into a toggle button

问题描述

我必须使用两个按钮（on_btn和off_btn）打开和关闭手电筒手电筒code。

我怎样才能在一个按键他们交往？

新手很可能你给精心建议好吗？

下code是从答案中发现：它适用于我的手机。但在模拟器上它，而在按钮上点击crashs。这里是猫登录 https://dl.dropbox.com/u/15065300/logcat1巴纽

行号74是：参数PARAMS = mCamera.getParameters（）;

有谁能够什么建议吗？

 公共类手电筒延伸活动{
    私人最终静态字符串LOG_TAG =手电筒
    私人按钮mOnBtn;
    私人相机mCamera;
    私人布尔isActive;    / **当第一次创建活动调用。 * /
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;      //这将是你的onCreate内...
        mOnBtn =（按钮）findViewById（R.id.on_btn）;
        mOnBtn.setOnClickListener（新OnClickListener（）{            公共无效的onClick（视图v）{
                flipSwitch（）;
                processClick（）;            }
        }）;
   }    //这将是你外面的onCreate
    公共无效flipSwitch（）{
        isActive = isActive！;
    }    @覆盖
    保护无效onResume（）{
        super.onResume（）;
        尝试{
            mCamera = Camera.open（）;
            mCamera.start preVIEW（）;
            Toast.makeText（getApplicationContext（）相机是present，Toast.LENGTH_LONG）.show（）;        }赶上（例外五）{
            Log.e（LOG_TAG，不可能D'ouvrir LA相机）;
        }
    }    @覆盖
    保护无效的onPause（）{
        如果（mCamera！= NULL）{
            mCamera.release（）;
            mCamera = NULL;
        }
        super.onPause（）;
    }    公共无效processClick（）{
        如果（isActive）{
            参数PARAMS = mCamera.getParameters（）;
            params.set（闪光模式，火炬）;
            mCamera.setParameters（PARAMS）;
            mCamera.start preVIEW（）;
        }        其他{             参数PARAMS = mCamera.getParameters（）;
             params.set（闪光模式，关）;
             mCamera.setParameters（PARAMS）;
             mCamera.stop preVIEW（）;        }
    }
}
 

解决方案

使用按钮翻转一个布尔值，并改变你的手电筒去开启和关闭相应。

 私人布尔isActive;//这将是你的onCreate内...
button.setOnClickListener（新View.onClickListener（）{
    公共无效的onClick（视图v）{
        flipSwitch（）;
        processClick（）;
    }
}//这将是你外面的onCreate
公共无效flipSwitch（）{
    isActive = isActive！;
}公共无效processClick（）{
    如果（isActive）{
        //按钮被点击
    }
    其他{
        //按钮被点击关闭
    }
}
 

I have a Flashlight code that use two buttons (on_btn and off_btn) to turn on and turn off the Flashlight.

How can I associate them in a single button?

Very novice can you give elaborate suggestion please?

The code below is found from an answer: And it works for my mobile. But on the emulator it crashs while clicking on the button. Here is the cat-log https://dl.dropbox.com/u/15065300/logcat1.png

The line number 74 is: Parameters params = mCamera.getParameters();

Can anybody any suggestion please?

public class FlashLight extends Activity {


    private final static String LOG_TAG = "FlashLight";  
    private Button mOnBtn;   
    private Camera mCamera;    
    private boolean isActive;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

      //this will be inside your onCreate...
        mOnBtn = (Button) findViewById(R.id.on_btn);
        mOnBtn.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                flipSwitch();
                processClick();

            }
        });
   }

    //these will be outside your onCreate
    public void flipSwitch() {
        isActive = !isActive;
    }

    @Override
    protected void onResume() {
        super.onResume();
        try{
            mCamera = Camera.open();
            mCamera.startPreview();
            Toast.makeText(getApplicationContext(),"Camera is  present", Toast.LENGTH_LONG).show();

        } 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();
    }

    public void processClick() {
        if(isActive) {
            Parameters params = mCamera.getParameters();
            params.set("flash-mode", "torch");
            mCamera.setParameters( params );
            mCamera.startPreview();
        }

        else { 

             Parameters params = mCamera.getParameters();
             params.set("flash-mode", "off");
             mCamera.setParameters( params );
             mCamera.stopPreview();

        }
    }
}

解决方案

use the button to flip a boolean value, and change your flashlight to go on and off accordingly.

private boolean isActive;

//this will be inside your onCreate...
button.setOnClickListener(new View.onClickListener() {
    public void onClick(View v) {
        flipSwitch();
        processClick();
    }
}

//these will be outside your onCreate
public void flipSwitch() {
    isActive = !isActive;
}

public void processClick() {
    if(isActive) {
        //button is clicked on
    }
    else {
        //button is clicked off
    }
}

这篇关于更改两个Button成切换按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！