Android開啓手電筒功能（完美適配Android4x,5x,6x）

最近在研究開啓安卓手電筒功能，總結了下Android4x、5x、6x的手電筒開啓方法，寫成公共方法，分享給你們。

添加攝像機和閃光燈權限

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

佈局文件

<?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">

    <Button  android:id="@+id/btn_open" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:text="打開手電筒" />

    <Button  android:id="@+id/btn_close" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="關閉手電筒" />
</LinearLayout>

具體實現

/** * Created by 猴子搬來的救兵Castiel * 博客地址：http://blog.csdn.net/mynameishuangshuai */

public class MainActivity extends AppCompatActivity {
    private CameraManager manager;// 聲明CameraManager對象
    private Camera m_Camera = null;// 聲明Camera對象

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnOpen = (Button) findViewById(R.id.btn_open);
        Button btnClose = (Button) findViewById(R.id.btn_close);
        manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        try {
            String[] camerList = manager.getCameraIdList();
            for (String str : camerList) {
            }
        } catch (CameraAccessException e) {
            Log.e("error", e.getMessage());
        }

        btnOpen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                lightSwitch(false);
            }
        });

        btnClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                lightSwitch(true);
            }
        });
    }

    /** * 手電筒控制方法 * * @param lightStatus * @return */
    private void lightSwitch(final boolean lightStatus) {
        if (lightStatus) { // 關閉手電筒
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                try {
                    manager.setTorchMode("0", false);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                if (m_Camera != null) {
                    m_Camera.stopPreview();
                    m_Camera.release();
                    m_Camera = null;
                }
            }
        } else { // 打開手電筒
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                try {
                    manager.setTorchMode("0", true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                final PackageManager pm = getPackageManager();
                final FeatureInfo[] features = pm.getSystemAvailableFeatures();
                for (final 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();
                        }
                        final Camera.Parameters parameters = m_Camera.getParameters();
                        parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                        m_Camera.setParameters(parameters);
                        m_Camera.startPreview();
                    }
                }
            }
        }
    }


    /** * 判斷Android系統版本是否 >= M(API23) */
    private boolean isM() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            return true;
        } else {
            return false;
        }
    }
}