Android 如何使用相机闪光灯作为手电筒?
下面是我在Android中启用手电筒的代码。在Toast消息中,它返回以下参数:auto、on、off和torch。将参数设置为FLASH_MODE_TORCH后,我无法启用TORCH。我的清单权限是:Android 如何使用相机闪光灯作为手电筒?,android,Android,下面是我在Android中启用手电筒的代码。在Toast消息中,它返回以下参数:auto、on、off和torch。将参数设置为FLASH_MODE_TORCH后,我无法启用TORCH。我的清单权限是: <uses-permission android:name="android.permission.CAMERA"></uses-permission> <permission android:name="android.permission.FLASHLI
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<permission android:name="android.permission.FLASHLIGHT"
android:permissionGroup="android.permission-group.HARDWARE_CONTROLS"
android:protectionLevel="normal"/>
<uses-feature android:name="android.hardware.camera"></uses-feature>
我的代码:
public class CameraFlashActivity extends Activity {
/** Called when the activity is first created. */
public Camera mCamera;
Parameters cameraParameters;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
boolean cameraPresnt = this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
if( cameraPresnt == true)
{
Toast.makeText(getApplicationContext(),"Flash is there",10).show();
if(mCamera==null)
{
try {
mCamera = Camera.open();
mCamera.startPreview();
Toast.makeText(getApplicationContext(),"Camera is present",10).show();
} catch (Exception e) {
Log.i("CameraFlashActivity", "Camera.open() failed: " + e.getMessage());
}
if(mCamera==null)
{
Toast.makeText(getApplicationContext(),"Camera object is null",10).show();
}
else
{
cameraParameters = mCamera.getParameters();
if(cameraParameters==null)
{
Toast.makeText(getApplicationContext(),"No camera parameters",10).show();
}
else
{
List<String> flashmodes = cameraParameters.getSupportedFlashModes();
String supportedFlashModes = cameraParameters.getFlashMode();
Toast.makeText(getApplicationContext(),flashmodes.toString(),10).show();
Toast.makeText(getApplicationContext(),supportedFlashModes,10).show();
cameraParameters.setFlashMode(Parameters.FLASH_MODE_ON);
mCamera.setParameters(cameraParameters);
String supportFlashModes = cameraParameters.getFlashMode();
Toast.makeText(getApplicationContext(),supportFlashModes,10).show();
Toast.makeText(getApplicationContext(),"Camera parameters are set on flash light",10).show();
}
}
}
else
{
}
}
else
{
Toast.makeText(getApplicationContext(),"Flash is not there",10).show();
}
}
public void onDestroy() {
super.onDestroy();
if (mCamera != null) {
cameraParameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(cameraParameters);
mCamera.stopPreview();
mCamera.release();
}
Log.i("cameraFlashLight", "onDestroy");
}
}
公共类CameraFlashActivity扩展活动{
/**在首次创建活动时调用*/
公共摄像机mCamera;
参数摄像机参数;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
boolean cameraPresnt=this.getPackageManager().hasSystemFeature(PackageManager.FEATURE\u CAMERA\u FLASH);
如果(cameraPresnt==true)
{
Toast.makeText(getApplicationContext(),“Flash就在那里”,10.show();
if(mCamera==null)
{
试一试{
mCamera=Camera.open();
mCamera.startPreview();
Toast.makeText(getApplicationContext(),“摄像机存在”,10.show();
}捕获(例外e){
Log.i(“CameraFlashActivity”,“Camera.open()失败:”+e.getMessage());
}
if(mCamera==null)
{
Toast.makeText(getApplicationContext(),“摄影机对象为空”,10.show();
}
其他的
{
cameraParameters=mCamera.getParameters();
if(cameraParameters==null)
{
Toast.makeText(getApplicationContext(),“无摄像机参数”,10.show();
}
其他的
{
List flashmodes=cameraParameters.getSupportedFlashModes();
String supportedFlashModes=cameraParameters.getFlashMode();
Toast.makeText(getApplicationContext(),flashmodes.toString(),10.show();
Toast.makeText(getApplicationContext(),supportedFlashModes,10.show();
cameraParameters.setFlashMode(参数.FLASH\u MODE\u ON);
mCamera.setParameters(cameraParameters);
String supportFlashModes=cameraParameters.getFlashMode();
Toast.makeText(getApplicationContext(),supportFlashModes,10.show();
Toast.makeText(getApplicationContext(),“相机参数设置在闪光灯上”,10.show();
}
}
}
其他的
{
}
}
其他的
{
Toast.makeText(getApplicationContext(),“Flash不存在”,10.show();
}
}
公共空间{
super.ondestory();
if(mCamera!=null){
摄像机参数。设置闪光灯模式(参数。闪光灯模式);
mCamera.setParameters(cameraParameters);
mCamera.stopPreview();
mCamera.release();
}
Log.i(“照相机手电筒”、“onDestroy”);
}
}
使用以下代码序列:
mCamera = Camera.open();
cameraParameters = mCamera.getParameters();
cameraParameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(parameters);
mCamera.startPreview();
使用以下代码序列:
mCamera = Camera.open();
cameraParameters = mCamera.getParameters();
cameraParameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(parameters);
mCamera.startPreview();