android 拍摄视频的简单demo（来自google官方文档）

傷城~ 2022-09-25 02:30 238阅读 0赞

原文：https://developer.android.com/guide/topics/media/camera.html\#capture-video

package com.example.video_sample;
    
    import java.io.File;
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    
    import android.media.CamcorderProfile;
    import android.media.MediaRecorder;
    import android.media.MediaRecorder.AudioSource;
    import android.media.MediaRecorder.VideoSource;
    import android.os.Bundle;
    import android.os.Environment;
    import android.R.bool;
    import android.app.Activity;
    import android.content.Context;
    import android.content.pm.PackageManager;
    import android.hardware.Camera;
    import android.util.Log;
    import android.view.Menu;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.FrameLayout;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    	private Camera mCamera;
    	private CameraPreviewView previewView;
    	private MediaRecorder recorder;
    	private boolean isrecording = false;
    	private Button btn;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            if (!checkCameraHardware(this)) {
    			return;
    		};
    		mCamera = getCameraInstance();
    		previewView = new CameraPreviewView(this, mCamera);
    		FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    		preview.addView(previewView);
    		btn = (Button) findViewById(R.id.btn);
    		btn.setOnClickListener(new OnClickListener() {
    			
    			@Override
    			public void onClick(View v) {
    				if (isrecording) {
    					releaseMediaRecoder();
    					//mCamera.lock();
    					btn.setText("Capture");
    					isrecording = false;
    				}
    				else {
    					if (prepareVideoRecorder()) {
    						recorder.start();
    						btn.setText("Stop");
    						isrecording = true;
    					}
    					else {
    						releaseMediaRecoder();
    					}
    				}
    			}
    		});
        }
        
        @Override
        protected void onPause() {
        	super.onPause();
        	releaseMediaRecoder();
        	releaseCamera();
        }
        
        private void releaseMediaRecoder(){
        	if (recorder != null) {
    			recorder.reset();
    			recorder.release();
    			recorder = null;
    			mCamera.lock();
    		}
        }
        
        private void releaseCamera(){
        	if (mCamera != null) {
    			mCamera.release();
    			mCamera = null;
    		}
        }
        
        /**
         * 创建MediaRecorder实例，并为之设定基本属性
         * @return
         */
        private boolean prepareVideoRecorder(){
        	recorder = new MediaRecorder();
        	mCamera.unlock();
        	recorder.setCamera(mCamera);
        	
        	recorder.setVideoSource(VideoSource.CAMERA);
        	recorder.setAudioSource(AudioSource.CAMCORDER);
        	
        	recorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
        	recorder.setOutputFile(getOutputMediaPath());
        	
        	recorder.setPreviewDisplay(previewView.getHolder().getSurface());
        	try {
    			recorder.prepare();
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
        	
        	return true;
        }
        
        /**
         * 获取输出video文件目录
         * @return
         */
        private String getOutputMediaPath() {
    		java.util.Date date = new java.util.Date();
    		String timeTemp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(date.getTime());
    		File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
    	              Environment.DIRECTORY_PICTURES), "MyCameraApp");
    		if (! mediaStorageDir.exists()){
    	        if (! mediaStorageDir.mkdirs()){
    	            Log.d("MyCameraApp", "failed to create directory");
    	            return null;
    	        }
    	    }
    
    		Log.e("Error", "getOutputMediaPath file path---"+
    			 	mediaStorageDir.getPath() + File.separator +
    				"VID_" + timeTemp+ ".mp4");
    		return mediaStorageDir.getPath() + File.separator +
    				"VID_" + timeTemp + ".mp4";
    	}
    
        public class CameraPreviewView extends SurfaceView implements SurfaceHolder.Callback{
        	private SurfaceHolder holder;
        	private Camera mCamera;
    
    		public CameraPreviewView(Context context, Camera camera) {
    			super(context);
    			this.mCamera = camera;
    			
    			holder = getHolder();
    			holder.addCallback(this);
    			holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    		}
    
    		@Override
    		public void surfaceChanged(SurfaceHolder holder, int format, int width,
    				int height) {
    			// TODO Auto-generated method stub
    			
    		}
    
    		@Override
    		public void surfaceCreated(SurfaceHolder holder) {
    			try {
    				mCamera.setPreviewDisplay(holder);
    				mCamera.startPreview();
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
    			
    		}
    
    		@Override
    		public void surfaceDestroyed(SurfaceHolder holder) {
    			if (holder.getSurface() == null) {
    				return;
    			}
    			
    			try {
    				mCamera.stopPreview();
    			} catch (Exception e) {
    				e.printStackTrace();
    			}
    			
    			try {
    				mCamera.setPreviewDisplay(holder);
    				mCamera.startPreview();
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
    		}
        	
        }
        
        /**
         * 获取camera实例
         * @return
         */
        public static Camera getCameraInstance(){
        	Camera camera = null;
        	try {
        		camera = Camera.open();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
        	return camera;
        }
        
        /**
         * 检测手机有无摄像头
         * @param context
         * @return
         */
        private boolean checkCameraHardware(Context context){
        	if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
    			Toast.makeText(context, "successfully detact camera!", 1).show();
    			return true;
    		}
        	else {
        		Toast.makeText(context, "not detact camera!!!", 1).show();
        		return false;
    		}
        }
    }

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