安卓開發實現手電筒關閉開啟功能
阿新 • • 發佈:2019-02-19
許可權:
<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" />
佈局檔案:
<?xml version="1.0"encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.u.m.shoudiantong.MainActivity"> <Button android:id="@+id/btn_open" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:text="Open" /> <Button android:id="@+id/btn_close" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Close" /> </LinearLayout> MainActivity程式碼:
import android.annotation.TargetApi; import android.content.Context; import android.content.pm.FeatureInfo; import android.content.pm.PackageManager; import android.hardware.Camera; import android.hardware.camera2.CameraAccessException; import android.hardware.camera2.CameraManager; import android.os.Build; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private CameraManager manager;// 宣告CameraManager物件 private Camera m_Camera = null;// 宣告Camera物件 @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 { // 開啟手電筒 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)) { // 判斷裝置是否支援閃光燈 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; } }