Android 切换前后置摄像头 Demo

package cn.flys.camera; import android.app.Activity; import android.hardware.Camera; import android.hardware.Camera.CameraInfo; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup.LayoutParams; import android.view.Window; import android.widget.Button; public class SwitchActivity extends Activity implements OnClickListener{ private Preview mPreview; private Button mBtnSwitch; private Camera mCamera; private int numCamera; private int cameraId; private int cameraCurrentId; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); mPreview = new Preview(this); setContentView(mPreview); mBtnSwitch = new Button(this); mBtnSwitch.setText("切换前置摄像头"); mBtnSwitch.setOnClickListener(this); addContentView(mBtnSwitch, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); numCamera = Camera.getNumberOfCameras(); CameraInfo info = new CameraInfo(); for(int i = 0;i< numCamera;i++){ Camera.getCameraInfo(i, info); if(info.facing == CameraInfo.CAMERA_FACING_BACK){ cameraId = i; } } } @Override protected void onResume() { mCamera = Camera.open(); mPreview.setCamera(mCamera); cameraCurrentId = cameraId; super.onResume(); } @Override protected void onPause() { if (mCamera != null) { mPreview.setCamera(null); mCamera.release(); mCamera = null; } super.onPause(); } @Override public void onClick(View v) { if(mBtnSwitch.getText().equals("切换前置摄像头")){ mBtnSwitch.setText("切换后置摄像头"); }else{ mBtnSwitch.setText("切换前置摄像头"); } if (mCamera != null) { mCamera.stopPreview(); mCamera.release(); mCamera = null; } mCamera = Camera .open((cameraCurrentId + 1) % numCamera); cameraCurrentId = (cameraCurrentId + 1) % numCamera; mPreview.switchCamera(mCamera); mCamera.startPreview(); } }